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Review of additives for electrolyte of sodium-ion battery Yuyue GUO Xiaoying ZHAI Ningbo ZHANG The Chinese Journal of Process Engineering    2023, 23 (8): 1089-1101.   DOI: 10.12034/j.issn.1009-606X.223104 Abstract （619）   HTML （33）    PDF （3494KB）（511）       Knowledge map    Save With the upsurge of the energy revolution, secondary battery as a new way of energy storage has been widely concerned owing to their efficient energy conversion. As we all know, lithium-ion batteries (LIBs) have high operating voltage and high energy density, they can be used in various application scenarios, such as electrical vehicles (EV), portable electronic devices, and large-scale energy storage systems. However, due to the shortage of lithium resources and rising prices of raw materials, many battery companies are observed to undergo cost pressure and bankruptcy risk. Given this, sodium-ion batteries (SIBs) work similarly to lithium-ion batteries, but they have great advantages in terms of resource reserve, low cost, low temperature, rate performance, and safety, thus have received strong attention from researchers and engineers. In the sodium-ion battery system, it is also composed of the positive electrode, negative electrode, electrolyte, separator, and other key components. The electrolyte, as the intermediate bridge connecting the positive and negative electrode material system, plays a vital role to undertake the transport of sodium ions, which mainly consists of organic solvent, sodium salt, and additives. The introduction of a small number of functional additives can significantly improve the overall performance of the battery because it constructs a solid electrolyte interface (SEI) between electrolyte and electrode. Different kinds of additives can exhibit specific properties to meet different conditions. This review focuses on the use of electrolyte additives, including unsaturated carbonates, sulfur compounds, phosphorus compounds, silicon compounds, inorganic sodium salts, and other types of components. Meanwhile, the research progress and related mechanisms of this addition agent in the electrolyte of sodium-ion batteries in recent years were summarized as a reference for subsequent research. Finally, the future study of electrolyte additives prospects from the science idea and practical application, for example, density functional theory, AI for science, and in-situ analysis method for SIBs. Related Articles | Metrics

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CO2 methanation: recent advances in catalyst development and reaction mechanistic study Junbo TIAN Fangna GU Fabing SU Zhanguo ZHANG Guangwen XU The Chinese Journal of Process Engineering    2023, 23 (3): 375-395.   DOI: 10.12034/j.issn.1009-606X.222027 Abstract （659）   HTML （28）    PDF （12772KB）（349）       Knowledge map    Save Choosing a suitable approach for CO2 utilization is crucial to achieving carbon neutrality and carbon peak goals as early as possible. Synthesis of synthetic natural gas (SNG) by methanation of CO2 using hydrogen produced from renewable energy is widely regarded as an efficient and promising carbon capture and utilization technology, which is expected to realize carbon recycling. Considering the importance of CO2 methanation, we provide a systematic review of the latest studies. Firstly, the effect of different reaction conditions on CO2 methanation is introduced from the perspective of thermodynamics. Secondly, the research progress of CO2 methanation catalysts is reviewed from four aspects: active metal, support, preparation method, and assistive technology. In detail, the active components are classified into cheap metal-based (Ni, Fe, Co, and Mo) and noble metal-based (Ru, Rh, Pt, and Pd) materials, and the supports are divided into the conventional oxides (Al2O3, SiO2, TiO2, ZrO2, and CeO2) and the supports with novel structures (e.g., metal-organic frameworks and carbon-based materials), which are all discussed and evaluated in depth. The preparation methods of catalyst are classified as the conventional ones (such as impregnation, coprecipitation, hydrothermal, sol-gel, and solid-phase synthesis) and unconventional ones. The latter includes three technologies such as ultrasound, microwave, and plasma, which can speed up the synthesis and reaction process and facilitate the high dispersion of the active components on the supports. Subsequently, two reaction mechanisms in CO2 methanation (the formate and CO pathways) are discussed. The specific reaction pathway for CO2 methanation is related to the properties of the catalyst surface (e.g., hydroxyl abundance, adsorbed O2- sites) and the reaction conditions (e.g., reaction temperature and pressure). Finally, current research challenges are put forward, and the prospects for future research in this area are made. Related Articles | Metrics

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Research progress in modification of layered oxide cathode materials for sodium-ion batteries Miaomiao LI Xiangyun QIU Yanxin YIN Tao ZHANG Zuoqiang DAI The Chinese Journal of Process Engineering    2023, 23 (6): 799-813.   DOI: 10.12034/j.issn.1009-606X.222296 Abstract （322）   HTML （90）    PDF （47402KB）（337）       Knowledge map    Save Sodium-ion batteries (SIBs) have been regarded as the major candidate technologies for large-scale energy storage applications due to the rich abundance of Na sources, low cost and safety. And the development of cathode materials also determines the final performances and commercialization. Layered oxide cathode materials have the advantages of high specific capacity, simple structure and good stability. It is one of the most promising sodium cathode materials at present. However, such materials are still faced with irreversible changes in the electrochemical process, unstable storage in air and poor interface stability, which seriously restricts the development of commercialization of SIBs. In order to solve these problems of materials, researchers modified and optimized them. Accordingly, the modification measures of ion doping, surface coating, nanostructure design and P/O mixing and other related modification measures of sodium electric layered oxide cathode materials, which provides a basis for the modification research of sodium electric layered oxide cathode materials are reviewed in this review. Besides, the future development trend of layered oxides is prospected. Related Articles | Metrics

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Advances in biosynthesis of diamine as core monomers of new nylon materials Kun LIN Zhuang LI Kun WANG Ying BI Xiuling JI Zhigang ZHANG Yuhong HUANG The Chinese Journal of Process Engineering    2023, 23 (7): 958-971.   DOI: 10.12034/j.issn.1009-606X.223147 Abstract （332）   HTML （15）    PDF （1140KB）（277）       Knowledge map    Save In the context of carbon neutrality, bio-diamine synthesis is an effective way to achieve the low-carbon production and sustainable development. Using synthetic biology, metabolic engineering, protein engineering strategies, we are able to design and construct efficient key enzymes and pathways for the biosynthesis of diamines. In this work, the progress of diamine synthesis is reviewed around two synthetic strategies: microbial de novo fermentation and whole-cell catalysis. The main diamines include 1,4-butanediamine, 1,5-pentanediamine, and 1,6-hexamethylenediamine. The biosynthesis of butanediamine mainly includes ornithine decarboxylation and lysine decarboxylation pathways, and butanediamine is mainly produced by fermentation. However, the current yield of butanediamine is low and cannot meet the requirments of industrial production. The biosynthesis of pentanediamine depends on the decarbosylation of L-lysine, mainly by de novo fermentation and whole-cell catalysis. The whole-cell catalysis for pentanediamine is more efficient, which has been widely used in large-scale production with the maturity of the technology. Hexamethylenediamine is currently synthesized by constructing artificial pathways. In addition, to address the challenges encountered in the biosynthesis of diamines, such as many by-products, poor strain activity, low yield, difficult separation, and purification, we proposed methods to improve the biosynthesis of diamines by combining metabolic engineering and protein engineering to optimize key enzyme catalysis, exploring the mechanism of cell damage caused by diamine accumulation, enhancing the specificity and activity of enzyme catalysis to improve production intensity, and optimizing the fermentation system to simplify the subsequent separation and purification steps. Finally, we foresee the future direction and development prospect of diamine biosynthesis. Related Articles | Metrics

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Research review in regulating interfacial interaction on MOF-based mixed matrix membranes for gas separation Lili GONG Ju BAI Can WANG Wei LAI Linglong SHAN Shuangjiang LUO Zhichang LIU The Chinese Journal of Process Engineering    2023, 23 (4): 489-500.   DOI: 10.12034/j.issn.1009-606X.223054 Abstract （282）   HTML （21）    PDF （7406KB）（252）       Knowledge map    Save Mixed matrix membranes (MMMs) have attracted substantial attention for gas separation, combining the advantages of organic polymers and inorganic fillers, which are expected to solve the Trade-off effect. Metal organic frameworks (MOF), as a kind of innovative filler, provided promising development opportunities for MMMs, thanks to high surface area and porosity, adjustable pores, and low density, etc. These unique physical and chemical properties promoted the application in gas adsorption, separation, and storage. MOF is regarded as good compatibility with the polymer matrix because the organic linkers in MOF are more similar to the organic chain of the polymer compared with traditional inorganic materials (molecular sieve or metal oxide, etc.). Gas separation performance is improved by incorporating MOF into the polymer matrix, which is expected to balance the Trade-off effect. However, the separation performance of MMMs is not simply the sum of the two phases and is far below the predicted theoretical value by the material simulation in most cases. One of the key reasons for these non-ideal morphologies resulting from poor interfacial compatibility, including the non-selective interfacial voids, polymer rigidified, and pore blockage, which reduce the separation performance of MMMs. Therefore, good interfacial compatibility plays a key role in MMMs. Constructing effective interface interactions is a feasible strategy to improve interface compatibility. Thus, in this review, a comprehensive overview of the main technical challenges in developing MOF-based MMMs and a detailed description of the interface issues are provided. And constructing different interface interactions, including hydrogen bonds, covalent bonds, coordination bonds and others, has been expounded through various methods and strategies in the last five years. Finally, it aims to summarize the positive effects on the properties of MMMs through effective and strong interface interactions, guiding the future development of MOF-based MMMs. Related Articles | Metrics

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Research progress and application of heat transfer enhancement of twisted oval tubes Xiuzhen LI Yingying TAN Junfei YUAN Zhanwei WANG Lin WANG The Chinese Journal of Process Engineering    2022, 22 (5): 561-572.   DOI: 10.12034/j.issn.1009-606X.221153 Abstract （409）      PDF （6683KB）（229）       Knowledge map    Save The twisted oval tube has simple structure, excellent heat transfer enhancement and anti-fouling performance, and has become one of the research hotspots in the field of passive heat transfer enhancement. In recent years, researchers have carried out a lot of research on the heat transfer performance of twisted elliptical tubes (bundles) through experiments and numerical simulations. The mechanism of heat transfer enhancement is explained.Although there are reviews on the technology of twisted oval tube exchangers, there are deficiencies in the induction of the heat transfer enhancement characteristics of twisted oval tubes and the analysis of the research clues of the engineering application. This review focuses on the internal and external heat transfer and flow resistance performance of the twisted oval tube, and summarizes the influence of the structure of the twisted oval tube (bundle), working fluid and flow state on the heat transfer performance and flow resistance characteristics. The review also reviews the engineering application cases of twisted oval tube heat exchangers, and outlines the contents to be perfected in the researches on twisted oval tubes, and prospects the development trend of the research on heat transfer intensification of twisted oval tubes. This review is expected to provide guidance and reference for deepening the theoretical research and engineering practice of twisted oval tubes. Related Articles | Metrics

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Theoretical design of new energy solid-state battery materials and development of battery technology under the background of carbon peaking and carbon neutrality Hongjie XU Guanghui WANG Yujie SU Zhigao ZHANG Haitong LI Zhongzheng YANG Yuchen WANG Linyue HU Guoqin CAO The Chinese Journal of Process Engineering    2023, 23 (7): 943-957.   DOI: 10.12034/j.issn.1009-606X.223113 Abstract （232）   HTML （7）    PDF （4779KB）（224）       Knowledge map    Save Rechargeable lithium metal batteries (LMBs) have attracted wide attention due to their high theoretical energy density and important applications in portable electronic devices, electric vehicles, and smart grids. However, the implementation of LMBs in practice still faces many challenges, such as low Coulombic efficiency, poor cycle performance, and complex interfacial reactions. An in-depth analysis of the physical basis and chemical science of solid-state batteries is of great significance for battery development. To confirm and supplement the experimental research mechanism, theoretical calculation provides strong support for exploring the thermodynamic and kinetic behavior of battery materials and their interfaces and lays a theoretical foundation for designing batteries with better comprehensive performance. In this review, the theoretical and structural design ideas of the Li10GeP2S12 system and argyrodite system in sulfide solid electrolytes are reviewed, including the transport mechanism and diffusion path of lithium ions. The theoretical design ideas of new anti-perovskite Li3OCl and double anti-perovskite Li6OSI2 electrolyte systems are analyzed. The transport mechanism of Li+ in oxide solid electrolyte systems under defect regulation is reviewed. In addition, the theoretical design of new halide electrolyte systems, and the role of computational materials science in the study of battery material properties are also introduced. The key issues such as ion transport mechanism, phase stability, voltage platform, chemical and electrochemical stability, the interface buffer layer, and electrode/electrolyte interface are analyzed by theoretical methods. Understanding the charge-discharge mechanism at the atomic scale and providing reasonable design strategies for electrode materials and electrolytes. Related Articles | Metrics

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Progress on catalysts for hydrogen production by low temperature methanol water reforming Zhan SHEN Zhidong JIANG Pengfei ZHANG Ziyu ZHANG Haiying CHE Zifeng MA The Chinese Journal of Process Engineering    2022, 22 (5): 573-585.   DOI: 10.12034/j.issn.1009-606X.221147 Abstract （640）      PDF （1690KB）（216）       Knowledge map    Save Methanol is a promising energy carrier owing to its simple structure, high hydrogen content and huge production capacity. Methanol steam reforming (MSR) is an energy-saving and efficient on-site hydrogen production method. Combined with fuel cells, MSR can be applied in many fields. However, due to the high reaction temperature (250~300℃), there are some problems such as slow start-up, high CO content and low thermal efficiency. Low temperature methanol water reforming (LT-MWR), including LT-MSR and aqueous-phase reforming of methanol (APRM), means that the reaction proceeds below 200℃, and maintains high reaction activity, which can reduce the preheating time and the side reactions, and achieve stronger thermal coupling with fuel cells. In this review, the performance and defects of commercial catalysts are firstly introduced based on characterization results. The research of LT-MWR catalysts for hydrogen production is reviewed, including Cu-based catalysts, noble metal catalysts and photo-synergistic catalysts. The modification strategies for low temperature Cu-based catalysts are summarized, including synthesis methods, structure design and element doping. The commercial CuZnAlOx catalyst at home and abroad has the characteristics of high methanol conversion and good stability, despite its relatively high price and low activity below 200℃. Because the activity of Cu-based catalysts is greatly affected by temperature, the catalytic activity decreases sharply at low temperature. By appropriate modification, Cu-based catalysts can perform high activity at low temperature. Noble metal catalysts have high activity at low temperature, but they are expensive and the synthesis process is complex. Photo-synergistic catalysts are functional under the condition of light, which is still in the research stage. The synthesis method can strengthen the micromixing degree and reproducibility. Appropriate structure design can increase the specific surface area and thermal stability of the catalyst. Element doping enables better dispersion of active components and modifies the surface structure. Three modification strategies can effectively improve the performance of Cu-based catalyst for LT-MSR, reducing the content of CO content while maintaining high activity. Finally, the prospect and challenges of LT-MSR catalysts for hydrogen production are prospected. Related Articles | Metrics

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Research progress of thermal management technology for lithium-ion batteries Jiaxin LI Pengzhao LI Miao WANG Chun CHEN Liangyu YAN Yue GAO Shengchen YANG Manman CHEN Cai ZHAO Jing MAO The Chinese Journal of Process Engineering    2023, 23 (8): 1102-1117.   DOI: 10.12034/j.issn.1009-606X.223094 Abstract （396）   HTML （21）    PDF （13593KB）（209）       Knowledge map    Save Efficient battery thermal management technology is critical to the safe operation, long cycle life, and overall cost reduction of lithium-ion batteries and is important in promoting the large-scale application of lithium-ion batteries. In this review, several mainstream battery thermal management technologies are discussed in detail, including air cooling, liquid cooling, new phase change material cooling, and thermoelectric cooling technology. The battery heat generation model is briefly described. Finally, the development direction of battery cooling technology is prospected. Air cooling technology is simple in structure, but it is difficult to ensure temperature uniformity of the cells within the battery pack and is not suitable for cooling large lithium-ion battery packs, but is more suitable for small flying electric devices and low-end electric vehicles. Cooling plate liquid cooling technology is more effective, but there is a risk of coolant leakage and the temperature uniformity needs to be further improved. Immersion liquid cooling technology offers significant cooling and temperature uniformity but is expensive and is likely to be used more often in the future in energy storage plants with high cooling requirements, while for most lithium-ion electric vehicles the lower-cost cooling plate liquid cooling technology is more suitable. Phase change material cooling and thermoelectric cooling technologies without moving parts have achieved initial commercial application in electronic equipment and small power plants, but the cooling efficiency is low and needs further refinement. It is worth noting that it is critical to choose the right cooling technology for the user's needs. While there is no perfect cooling solution, a combination of cooling technologies can be used to meet the thermal management needs of a wider range of application scenarios. Related Articles | Metrics

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Large eddy simulation for single particle wake characteristics in concave-wall tangential jet Jing ZHANG Wenhao HOU Chenghao ZHOU Zhiguo TIAN Bin GONG The Chinese Journal of Process Engineering    2023, 23 (11): 1497-1505.   DOI: 10.12034/j.issn.1009-606X.223019 Abstract （124）   HTML （4）    PDF （6139KB）（203）       Knowledge map    Save Large eddy simulation was used to simulate the influence of spherical particles near the wall on fluid flow characteristics under the action of tangential jets on the concave-wall. The simulated wake vortex results were in good agreement with the experimental tracer image. The vortex structure and its evolution process of particle wake with particle diameter dp=4 mm and radius of curvature of concave wall R=200 mm were studied. The changes of velocity, vorticity, and streamline around the particle were investigated at Reynolds number Re=700~10 000. The results showed that the vorticity in the influence area of particles increased, the peak value of vorticity always appeared on the upstream surface of particles, and the recirculation zone behind the particles shrank significantly with the increase of Reynolds number. When Re=700, there was only one wake vortex behind the particle along the concave wall jet spanwise. When Re≥2000, there were two wake vortices behind particles along the concave wall jet spanwise, and the tangential velocity and vorticity of the fluid fluctuated periodically. The particle lift and resistance were monitored. There was the vortex shedding frequency at Strouhal number St=0.000 854 when Re=2000, and the peak value of the lift power spectrum occurred at St=0.001 52. The frequency peak corresponding to the boundary layer and wake instability was not found in the drag power spectrum when Re=10 000, and the peak of the lift power spectrum occurred at St=0.008 74. The particle wake had a great influence on the flow field. The analysis of the particle wake characteristics in the tangential jet on the concave wall was an in-depth study of the liquid-solid two phase separation mechanism. It provided the theory for the characteristics of single particle wake vortex in the process of heterogeneous separation of the tangential jet from concave wall. Related Articles | Metrics

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Research progress on sodium storage mechanism and performance of anode materials for sodium-ion batteries Cheng HAN Shaojie WU Chaoyang WU Mingyang LI Hongming LONG Xiangpeng GAO The Chinese Journal of Process Engineering    2023, 23 (2): 173-187.   DOI: 10.12034/j.issn.1009-606X.222083 Abstract （402）   HTML （13）    PDF （1833KB）（198）       Knowledge map    Save The massive use of fossil fuels is bound to cause irreversible damage to the global ecological environment. New energy sources such as solar, wind, and tidal have the advantages of being clean, non-hazardous, and renewable, and can be used to replace fossil fuels to alleviate the environmental crisis. The development and utilization of green energy have led to the rapid development of electrochemical energy storage and conversion technologies to store clean and renewable energy in the grid. Lithium-ion batteries, one of the most successful secondary ion batteries in energy storage, have been used in various electronic products, but expensive and scarce raw material resources limit their applications in the field of large-scale energy storage equipment. Therefore, the search for inexpensive secondary ion batteries with excellent performance is one of the hot research topics nowadays. As a new type of secondary ion battery, sodium-ion battery not only has a similar working principle as a lithium-ion battery but also features low cost, high resource abundance, and high reversible capacity. The extensive exploration by researchers is expected to make it a successful alternative to lithium-ion batteries for commercial production. This work mainly reviews the progress of the research on the performance of sodium-ion battery anode materials, firstly, the three mechanisms of sodium storage in the anode materials, namely the intercalation reaction, alloying reaction, and conversion reaction, are analyzed and summarized according to the different ways of sodium ion storage in the anode materials. Then, according to the performance of sodium-ion battery anode materials, three common modifications of anode materials are summarized: structural modification, elemental doping, and material compounding, and the electrochemical properties of anode materials before and after modification are compared. Then, the research status and problems faced by several key anode materials for sodium-ion batteries, such as carbon-based materials, titanium-based materials, alloy-based materials, conversion-based materials, and organic materials, are highlighted. Finally, the research directions of sodium-ion battery anode materials are prospected based on the actual production and industrial applications. Related Articles | Metrics

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Cover and Contents The Chinese Journal of Process Engineering    2023, 23 (7): 0-.   Abstract （92）      PDF （2307KB）（182）       Knowledge map    Save Related Articles | Metrics

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Cover and Contents The Chinese Journal of Process Engineering    2022, 22 (5): 0-.   Abstract （147）      PDF （1524KB）（176）       Knowledge map    Save Related Articles | Metrics

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Research progress of fluidized bed direct reduction at Institute of Process Engineering Chuanlin FAN Zhan DU Feng PAN Zheng ZOU Jun LI Hongzhong LI Qingshan ZHU The Chinese Journal of Process Engineering    2022, 22 (10): 1325-1332.   DOI: 10.12034/j.issn.1009-606X.222325 Abstract （302）   HTML （27）    PDF （4964KB）（176）       Knowledge map    Save Under the background of carbon peaking and carbon neutrality, iron and steel industry urgently needs low-carbon reconstruction. Hydrogen direct reduction (usually called "hydrogen metallurgy") is an important research field in the domestic and overseas. Fluidized bed (FB) direct reduction has been the research direction at Institute of Process Engineering (IPE) for more than 60 years. On the occasion of commemorating the 120th anniversary of Professor Chu-Phay Yap's birth, this work reviews and summarizes a series of important achievements on basic researches and industrial applications of FB direct reduction at IPE. In the basic researches respect, the competition of adhesive force and rupturing force for particle sticking, the behaviors of agglomerate fluidization and slow defluidization, the growth mechanisms and sticking characteristics of newly formed iron with different morphologies were revealed; and a series of methods for anti-defluidization were successively established, including particle coating and iron morphology regulation to reduce the adhesive force, and enhance particle motion, particle size increase, using external field forces to increase the rupturing force. Furthermore, several pilot plants with various iron ores were constructed and operated to promote the industrial application of new technologies, including hydrogen FB direct reduction of 100 kg/d iron ore concentrate, 1 t/d vanadium bearing titanomagnetite and FB direct reduction-electric furnace smelting of 2000 t/a vanadium bearing titanomagnetite. Currently, IPE is cooperating with Ansteel Group to establish the world's first FB direct reduction pilot plant of 10 000 t-DRI/a using green hydrogen. This paper aims to commemorates Professor Chu-Phay Yap, Professor Mooson Kwauk and other scientists of the older generation, and also to propel advance of basic theory and technology in FB direct reduction, for promotion of the low-carbon development for the iron and steel industry of China. Related Articles | Metrics

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Research progress of lithium polysulfide capture in lithium-sulfur batteries Tingting HU Haijian LIU Yunyi CHEN Lingli LIU Chun'ai DAI Yongsheng HAN The Chinese Journal of Process Engineering    2023, 23 (9): 1231-1243.   DOI: 10.12034/j.issn.1009-606X.222413 Abstract （168）   HTML （17）    PDF （6063KB）（173）       Knowledge map    Save Lithium-sulfur battery has an ultra-high theoretical specific capacity (1675 mAh/g) and theoretical specific energy (2600 Wh/kg), which is far higher than commercial secondary batteries. In addition, the sulfur element is rich in the earth, and its price is cheap, the extraction process is environmentally friendly. Therefore, a lithium-sulfur battery is considered as an ideal energy storage unit for the future energy storage system. However, the lithium polysulfide intermediates generated in the charging and discharging process are easily soluble in the electrolyte, resulting in a loss of active materials and an increase in the electrolyte viscosity. In addition, the dissolved lithium polysulfide is inclined to migrate between positive and negative electrodes, and reacts with the lithium negative electrode, causing irreversible loss of active substance sulfur, greatly reducing the battery life and safety. This phenomenon is called the shuttle effect, which hinders the commercialization process of lithium-sulfur batteries. In recent years, researchers have attempted to solve this problem through physical adsorption, chemical action, and external field constraint, and achieved impressive progress. This work summarizes the research progress of capturing lithium polysulfide, and compares the characteristics of each approach and its impact on the electrochemical performance of lithium-sulfur batteries. Whether it is the physical constraint of the porous structure of carbon materials, the chemical interaction between the carrier materials and lithium polysulfide, or the adsorption of electric and magnetic fields on lithium polysulfide, lithium polysulfide is fixed on the positive side and to inhibit its dissolution and diffusion to the negative electrode. Capturing lithium polysulfide by external magnetic field, internal magnetic field induced by magnetic particles, and internal electric field generated by spontaneous polarization of ferroelectric materials is also highlighted. Finally, the challenges in capturing lithium polysulfide and the possible solution are prospected. Related Articles | Metrics

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Research progress of bubble separation behavior on electrodes and its strengthening technology Wei LIN Zhangwei WANG Wei WANG Jimin LI Zixin GUO Jin XIANG Xinyuan QIU Hongyang ZHAN Jiuyang YU The Chinese Journal of Process Engineering    2022, 22 (9): 1147-1158.   DOI: 10.12034/j.issn.1009-606X.221283 Abstract （401）   HTML （14）    PDF （3257KB）（166）       Knowledge map    Save The rapid development of the global economy inevitably caused the rapid consumption of fossil resources and serious environmental pollution problems. Hydrogen plays an increasingly important role in energy supply and environmental protection as a clean energy, water electrolysis is a way to produce hydrogen on a large scale, so it is very important to enhance the efficiency of water electrolysis for hydrogen energy production. How to improve the electrolysis efficiency of water electrolysis technology has been widely concerned. During electrolysis, the gas produced at both ends of the electrode can go in one of three directions: out of the cell, dissolved in the electrolyte, or attached to the electrode. However, in the electrolysis process, the bubbles attached to the electrode will seriously affect the contact area between the electrode and electrolyte, which directly reduces the electrolysis efficiency. Therefore, reducing the residence time of bubbles on the electrode can effectively increase the contact time between electrolyte and electrode and improve the efficiency of hydrogen production. In this work, the recent progress in promoting the separation of hydrogen and oxygen bubbles from the plate during electrolysis is reviewed. The nucleation, growth, coalescence and separation of bubbles are studied from the aspects of plate properties, current, solution concentration, and external physical field, and the characteristics of various methods to enhance bubble separation are discussed and summarized. The electrolytic efficiency can be improved and the energy consumption of electrolysis can be reduced by promoting the bubble separation on the electrode. The future development direction and route are prospected, this provides fundamental insight and direction for the future design of the bubble separation technology in water electrolysis. Related Articles | Metrics

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Co-pyrolysis characteristics of caking coal with non-caking coal Fujun LI Zhouen LIU Shiqiu GAO Xin JIN Yimin XIE Zhipeng HE The Chinese Journal of Process Engineering    2022, 22 (5): 640-650.   DOI: 10.12034/j.issn.1009-606X.221084 Abstract （268）      PDF （1566KB）（164）       Knowledge map    Save The decaking technology with co-pyrolysis of caking coal and non-caking coal was brought out to destroy the caking property of caking coal. And the properties of decaking and co-pyrolysis of caking coal with the decaking technology were studied with co-pyrolysis experiments using TG-MS and fixed bed pyrolyzer. It could be seen from TG-MS experiments that the caking property of the mixed coal produced by caking coal and non-caking coal was smaller than that of caking coal. And pyrolysis of caking coal can be improved by the addition of non-caking coal. The co-pyrolysis characteristics of the mixed coal were the combined action of those of the two single coals. And it could be seen from the fixed-bed pyrolysis experiment that the decline of caking property of the mixed coal rised with smaller particle size of coal and the descent of the ratio of caking coal to non-caking coal in the mixed coal (XX:XF). And the agglomerate was slight. With the descent of XX:XF, the content of char reduced in pyrolysis products, but the contents of tar, coal gas and carbon deposition and water were higher. With the descent of XX:XF, the fractions of distillation cut <170℃ and 230~300℃ in tar from mixed coal first rise and then decrease and reach peak value at XX:XF=6:4~3:7, and the fractions of distillation cut of 170~210℃, 210~230℃, 300~360℃ rised, while the fraction of distillation cut >360℃ decreased. With the descent of XX:XF, the contents of H2, CO and CO2 in coal gas from mixed coal become larger, but the contents of CH4 and C2~C3 became smaller. While the contents of H2+CO+CH4 became first smaller and then larger with XX:XF and reached peak value at XX:XF=5:5~3:7. And with the descent of XX:XF, the char from mixed coal had smaller C/N and C/H, larger amplitudes of increase of C content and reduction of content of N and H, larger special surface area, more and larger internal pore structure, lower ignition temperature, more complete combustion. Related Articles | Metrics

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Research progress on liquid bridge fracture in field of micro-nano technology Zhaofei ZHU Yalong CHU Xianming GAO The Chinese Journal of Process Engineering    2023, 23 (6): 814-825.   DOI: 10.12034/j.issn.1009-606X.222287 Abstract （201）   HTML （8）    PDF （4290KB）（161）       Knowledge map    Save Affected by the scale effect, the morphological characteristics of liquid bridges at the microscale determine the changes in liquid bridge forces that are area-related. Liquid bridge forces have an important impact on the formation and fracture of liquid bridges. The liquid bridge fracture mechanism based on liquid bridge morphology is the theoretical basis of biology, chemistry, materials, micro-nano technology, and many other research fields. At present, the study of liquid bridge fracture is an interdisciplinary discipline involving mathematics, fluid mechanics, interface chemistry, materials science, and other disciplines, however there is few review of the research progress focusing on liquid bridge fracture based on liquid bridge morphology. This review mainly summarizes the fracture theoretical models and experimental methods of axisymmetric liquid bridges, non-axisymmetric liquid bridges, and non-Newtonian liquid bridges. It mainly introduces the weak nonlinear behavior of the fluid generated during the tensile and rupture of the liquid bridge under equilibrium or steady state caused by the forced hydraulic bridge. The influences of key factors such as liquid volume, viscosity, surface tension, wettability, roughness of the solid surface, fracture speed, and liquid bridge morphology on the fracture location or liquid distribution rate of the liquid bridge are systematically described. The experimental methods for quantitatively studying the use of different key parameters affecting liquid bridge fracture are analyzed. The structural characteristics of different experimental apparatus and their advantages and disadvantages are compared and discussed. Furthermore, the innovative and high-value research direction of the research is summarized and proposed, which may be used in future research. Finally, the research frontier trends of liquid bridge fracture in the field of micro-nano technology prospected, and it is pointed out that the future research focused on issues including a more comprehensive hydraulic bridge fracture model, the fracture mechanism, and multi-parameter control method of the liquid bridge. Related Articles | Metrics

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Gas-liquid flow simulation of a distillation tray based on OpenFOAM Xiaoqing ZHOU Yunpeng JIAO Tianbo FAN Xianfeng HE Jianhua CHEN The Chinese Journal of Process Engineering    2023, 23 (6): 858-869.   DOI: 10.12034/j.issn.1009-606X.222258 Abstract （173）   HTML （2）    PDF （8891KB）（155）       Knowledge map    Save Distillation column with sieve tray is an important separation equipment and widely used in the process industry. The complex behavior of the gas-liquid two-phase flow in distillation columns, especially on the tray, significantly affects the separation performance. With increasing applications of the CFD simulation in multiphase flow, it is interesting to adopt the CFD tools in distillation design and optimization. Traditionally, commercial CFD software has been applied in this field, while they face the problems of black-box feature, limited and expensive license, inflexibility of developing tailored models, etc. Therefore, this work turns to the open source platform of OpenFOAM. By using the Eulerian solver in OpenFOAM, an experimental sieve tray column is studied. The two-phase flow characteristics under different operating conditions are explored, including the height of the clear liquid layer, the gas and liquid velocity, the pressure drop, etc. The predicted trends are consistent with the experimental results. The simulated clear liquid height decreases with increasing gas flow rate and increases with liquid flow rate, and its deviation from the experiments is attributed to the empirical drag correlations which need further study. The influences of sieve holes and liquid inlet conditions on the liquid velocity distribution have been studied. It is found that the number of sieve holes has little impact, and simulations with non-uniform liquid inlet conditions agree with the experiments better. This study verifies the feasibility of using OpenFOAM to simulate distillation columns. The next step is to apply the mesoscale approach to gas-liquid crossing flow systems, construct a new interphase drag model to improve the accuracy of the simulation, and consider the influence of heat and mass transfer on the flow field. This work lays a foundation for the next-step coupling simulations, which is promising for the design and optimization of distillation columns. Related Articles | Metrics

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Technical consideration on the transition from "ultra-low emissions" to "reduction of pollution and carbon emissions" in China's iron and steel industry Tingyu ZHU Xiaolong LIU The Chinese Journal of Process Engineering    2022, 22 (10): 1360-1367.   DOI: 10.12034/j.issn.1009-606X.222353 Abstract （350）   HTML （20）    PDF （2835KB）（155）       Knowledge map    Save The iron and steel industry plays an important role in China's national economy, and it is also the largest pollution-carbon emission in China. In April 2019, five ministries and commissions jointly issued the "Opinions on Promoting the Implementation of Ultra-low Emissions in the Iron and Steel Industry", leading to a beginning of ultra-low emissions for industrial flue gas, and the air pollution emissions of China's steel industry achieved a significant reduction. Since the "14th Five-Year Plan", under the background of carbon peaking and carbon neutrality, with the proposal of pollution and carbon reduction, the problem of carbon incremental effect caused by ultra-low emission technologies has gradually become prominent, which has brought new technological needs to the steel industry. This work expounds the technological progress of ultra-low emissions in China's steel industry, summarizes the development direction of pollution and carbon reduction in the steel industry, and puts forward suggestions for the green and low-carbon development of the steel industry in the future, providing a reference for promoting the high-quality green development of China's steel industry. Related Articles | Metrics

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Current application and development of microneedle Sibo ZHAO Yiru BAO Min XIE The Chinese Journal of Process Engineering    2023, 23 (2): 163-172.   DOI: 10.12034/j.issn.1009-606X.222114 Abstract （409）   HTML （160）    PDF （2905KB）（154）       Knowledge map    Save Microneedles are micrometer sized single needles or needle arrays that are produced by microfabricating techniques. Microneedles could penetrate the stratum corneum layer of the skin to reach the dermal layer which is favorable for percutaneous drug delivery. Microneedles have a number of advantages in drug delivery, compared with oral administration, microneedles circumvent the metabolic effects of the digestive system on drugs, compared with injection needles, microneedles are able to reduce pain and improve adherence compliance in patients. Due to their special transdermal pathway and precise, convenient application methods, microneedle has also become a hot studies area in biomedicine at present and their applications in vaccination, tissue fluid extraction and biomarker detection, etc. have been well investigated. According to working mechanisms for percutaneous drug delivery, microneedles can be classified as five kinds, including solid, coated, dissolving, hollow, and hydrogel microneedles. This review, combined with relevant articles in the field of microneedle technology in recent years, provides a brief overview of the types and fabricating materials of microneedles, mainly introduces the current applications of microneedles in the field of drug delivery (such as insulin injection for diabetes treatment, local drug delivery for cancer treatment, vaccination, tissue fluid extraction and biomarker detection, etc.) Besides, if the microneedles would be widely applied in the marker for medical application, some factors including mechanic strength, biological safety, sterilization process and biological stability of biomolecules on the micrneedles should be well considered which are also discussed in the review. At last, outlooks on microneedles' future development are prospected, such as developing microneedles based drug delivery system for heart attack treatment, improving biological stability of the biological molecules on the microneedles for convenient vaccination, and combining of microneedles with other techniques, such as sensitive biomarker detection method, microfluidic chip and wearable device, which will open a new prospect for the development of microneedles techniques. Related Articles | Metrics

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Research progress on molding process of catalysts for fixed bed reactor Shanshan LIU Qida DING Tao GUO Yaofeng WANG Baohua XU The Chinese Journal of Process Engineering    2023, 23 (4): 501-511.   DOI: 10.12034/j.issn.1009-606X.222088 Abstract （224）   HTML （9）    PDF （1464KB）（153）       Knowledge map    Save The progresses obtained in the catalytic technology are driven by the social demands, such as environment, energy, chemicals, and fuels. The ultimate goal is to increase the process efficiency for scale-up. The molding catalysts are usually multicomponent material of millimetre-size consisting of the active phases, supports, and various molding additives suitable for commercial applications. Different from the powder catalysts, the molding catalysts should not only possess the catalytic activity of the powder catalyst but also consider the use of binder, lubricant, acid and pore-forming agent to satisfy the required mechanical strength and chemical stability to ensure that they can run smoothly and have a long life in industrial reactors. In addition, the shape and size of the molding catalysts affect the catalytic performance by affecting the flow state of the materials inside the reactor. Therefore, the molding process is complex and full of challenges. This review introduces the influence of molding conditions on both the mechanical and the catalytic properties at the fixed bed. Specifically, the effects of the types and amounts of additives, the addition sequence, the calcination conditions, the pulp ratio, and the shape and size of molding catalysts are focused. Weibull modulus can be used to measure the reliability of mechanical strength of brittle materials, and further judge and predict the reliability of catalyst strength value. In addition, this review also introduces the application of Weibull distribution in the reliability judgment and prediction of catalyst strength value, and the progress of computational fluid dynamics (CFD) simulation in assisting catalyst morphology design. The potential of Weibull distribution and CFD in future applications of molding catalyst are pointed out. Related Articles | Metrics

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Multiscale discrete particle simulation for iron and steel industry: progress and prospect Ji XU Wei GE Limin WANG Jinghai LI The Chinese Journal of Process Engineering    2022, 22 (10): 1308-1316.   DOI: 10.12034/j.issn.1009-606X.222276 Abstract （263）   HTML （25）    PDF （5336KB）（153）       Knowledge map    Save To achieve the carbon peaking and carbon neutrality goals, the steel industry is currently facing an urgent need for transformation and upgrading. Due to the long development cycle and high cost of the experimental methods, simulation methods of high accuracy and high efficiency are playing an important role in realizing the intelligent and green technology of the steel industry. However, the applicable simulation toolkits are lacking due to the complexity and diversity of the iron-making and steel-making processes. This article introduces the possibility to realize a high-performance, more accurate multiscale discrete particle simulation method based on the consistency of the logic and structure between the problem, model, software, and hardware, namely the EMMS paradigm. Some preliminary applications on the optimization of apparatus structures and operating conditions in the steel industry are summarized, e.g., enhancing the iron ore raw material separation process by adding the permanent magnets, optimizing the structure of the inlet region of a sinter vertically arranged cooler for higher heat recovery efficiency, optimizing the operation of the rotating drum to enhance the throughput of dealing with the steel slag, and the operational optimization of the burden distribution in the blast furnace to reduce the coke consumption. These successful applications demonstrate that the multiscale discrete particle simulation method is becoming a powerful tool for the steel industry. Thus, the realization of the higher level tool for transformation and upgrading of the steel industry, namely virtual process engineering (VPE), is prospected, which requires integrating the multi-scale discrete particle simulation with online measurement, artificial intelligence (AI), interactive simulation, virtual reality (VR) and online control. Related Articles | Metrics

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Low-carbon and high-efficiency ammonia synthesis process from blast furnace gas/converter gas Fujian LIU Yong ZHENG Yanning CAO Lilong JIANG The Chinese Journal of Process Engineering    2023, 23 (3): 350-358.   DOI: 10.12034/j.issn.1009-606X.222289 Abstract （227）   HTML （13）    PDF （24052KB）（151）       Knowledge map    Save As a major steel producer, the annual output of steel in China has reached 1.03 billion tons, ranking the highest amount over the world. Blast furnace gas/converter gas is the by-products of the blast furnace ironmaking industry, and its annual output is as high as ~1.8 trillion m3. Therefore, the realizing the clean and efficient utilization of blast furnace gas/converter gas is a major demand for the sustainable development. At present, the integrated utilization of blast furnace gas and converter gas by iron and steel companies mainly includes: one part is directly used as fuel for boilers, hot blast stoves, heating furnaces, etc.; The other part is to use the residual pressure of blast furnace gas to generate electricity, and then use the blast furnace gas as fuel for boilers, hot blast furnaces, and heating furnaces. With the continuous improvement of energy structure and environmental protection requirements in China, the integrated utilization of blast furnace gas/converter gas, purification and proportioning according to the raw material process requirements of industrial synthetic ammonia to produce green hydrogen, which is used as the raw feedstocks for synthetic ammonia. It can not only meet the demand of regional economic development for green synthetic ammonia production, but also realize the reorganization of blast furnace gas/converter gas resources. As a result, the new technique promotes the green development of the regional economy, which meets the current national requirements for energy saving and emission reduction for ammonia synthesis and the steel industry. Based on this, this review systematically analyzes and forecasts the low-carbon and high-efficiency ammonia synthesis process from blast furnace gas/converter gas and demonstrates the advantages of the developed technique. Related Articles | Metrics

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Research progress on gas-liquid two-phase flow characteristics of bubble plume Xin DONG Yinuo LIU Chen YE Jianwei ZHANG Ying FENG The Chinese Journal of Process Engineering    2023, 23 (1): 15-24.   DOI: 10.12034/j.issn.1009-606X.222021 Abstract （236）   HTML （1）    PDF （1035KB）（148）       Knowledge map    Save Bubble plume is a complex gas-liquid two-phase flow, which is widely used in industrial fields such as wastewater treatment, petroleum processing, environmental protection. The complex flow characteristics of bubble plume are very important for gas-liquid mass, momentum transfer and its industrial application. In this work, the flow characteristics of bubble plume in theoretical and experimental research are analyzed and summarized. The effects of different operating and structural parameters on the hydraulic characteristics such as gas holdup, bubble size distribution, plume width and oscillation are discussed. The simulation methods of observing and capturing the flow characteristics of bubble plume are summarized. In addition, due to the wide application of bubble plume, it is also very important to measure the bubble velocity distribution quickly and accurately. With the rapid development of digital image recognition technology, the combination of high-speed camera and digital image recognition technology provides an effective, intuitive and accurate method for bubble plume velocity. The prediction models and empirical formulas of hydraulic parameters such as gas holdup and bubble diameter are summarized, and the different applicable conditions of the models and formulas are listed. In the practical application of bubble plume, the structural morphology and flow characteristics of bubble plume change due to the complexity of environmental fluid (such as transverse flow in environmental fluid and stratification due to density and temperature difference of environmental fluid). Therefore, the research progress of gas-liquid two-phase flow characteristics of bubble plume in complex environment fluid is presented. The variation of bubble plume flow pattern and the effect of plume destratification in stratified fluid are summarized. The migration behavior and motion of plume in transverse flow environment are analyzed. Finally, the limitations of research methods and theoretical methods of gas-liquid two-phase flow characteristics of bubble plume are discussed. The multi-scale research direction of bubble plume motion law is proposed in further. Related Articles | Metrics

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Research progress of adsorption method to remove tetracycline from wastewater Xiong LAN Qin LIU Xintao ZHOU Zhongqiu LUO Xiaoteng ZHAO Yan LU The Chinese Journal of Process Engineering    2022, 22 (8): 989-1000.   DOI: 10.12034/j.issn.1009-606X.221261 Abstract （435）   HTML （16）    PDF （6695KB）（147）       Knowledge map    Save Tetracycline (TC) is a broad-spectrum antibiotic with large production and application at present. Its chemical properties are relatively stable and difficult to metabolize, so it is easy to accumulate in soil and water. The abuse of antibiotics not only increases the drug resistance of bacteria, but also produces resistance genes and induces the production of super-bacteria. Therefore, the harmless treatment of wastewater containing TC is urgent. Adsorption method has the advantages of easy operation, high removal rate, economy, and environmental protection. It is widely considered as an efficient method to remove antibiotics. The adsorption materials used to remove tetracycline from wastewater are different and various. This work mainly summarizes three kinds of common adsorbents: carbon materials, metal organic framework materials, and mineral materials. The adsorption capacity of the above materials for TC is listed, and the effects of pH value, temperature, ionic strength and other factors on the adsorption process of TC are analyzed. On this basis, the fitting of different adsorption kinetics and thermodynamic models when these three kinds of materials adsorb TC is analyzed. It is found that the adsorption kinetics of most materials meets with the quasi-second-order kinetic model, and the adsorption thermodynamics of the Freundlich thermodynamic model are better to describe the adsorption process. In addition, the mechanism involved in the removal of TC is also described. Finally, the advantages and disadvantages of these three kinds of materials in the study of TC adsorption are compared, and the future research focus is prospected, which provides a reference for accelerating the preparation of more economical, efficient and renewable TC removal adsorption materials. Related Articles | Metrics

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DEM modeling of resonant motion of particles inside moving bed Qinjian SHEN Shijie DONG Dancheng ZHANG Hui GUO Yinling SONG Xiaoxing LIU The Chinese Journal of Process Engineering    2023, 23 (6): 826-836.   DOI: 10.12034/j.issn.1009-606X.222161 Abstract （160）   HTML （5）    PDF （5476KB）（142）       Knowledge map    Save Moving beds are ubiquitous in various process industries. Thoroughly understanding and accurately characterizing the complex flow behavior of granular materials from the component particle scale is obviously of great significance for the design, scale-up, and optimization of moving beds. In this work, the flow behavior of granular assemblies in moving beds under both the funnel flow and semi-mass flow discharge regimes are investigated by performing three-dimensional discrete element method (DEM) simulations, with a focus on the possible similarities and differences between the fluctuating characteristics and also the corresponding underlying mechanisms of the transient motions of particles under these two discharging conditions. The reliability of the DEM simulation is verified by comparing the predicted evolutions of the boundary of the flowing zone and also its characteristic width with experimental results. The simulation results demonstrate that under both discharge conditions, the temporal variations of the spatially averaged axial velocity of particles in the upper part of the flowing zone present notable non-random fluctuating characteristics, manifested by the appearance of a clear peak in the Fourier spectrum of the time series of spatially averaged particle axial velocity. The spatial correlation analysis results show that the temporal fluctuations of the spatially averaged axial velocity of particles in different axial regions of the upper part of the flowing zone are closely correlated, suggesting the occurrences of resonance under both discharging types. The delayed correlation analyses of the time series of the spatially averaged axial velocities of particles in different axial zones indicate that such resonant behavior originates from a bottom zone right above the outlet. The delayed correlation analyses of the time series of the spatially averaged particle axial velocity and the spatially averaged particle contact force demonstrate that there exists a strong correlation between the temporal fluctuations of these two parameters, and the latter precedes the former, which hints that the observed resonance could be ascribed to the free-fall arch mechanism. In brief, the presented simulation results clearly demonstrate that resonance can occur during both funnel and semi-mass flow discharges and there is no intrinsic difference between the resonant features of particles under these two discharging conditions. Related Articles | Metrics

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Cover and Contents The Chinese Journal of Process Engineering    2023, 23 (9): 0-.   Abstract （69）      PDF （4613KB）（140）       Knowledge map    Save Related Articles | Metrics

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Discrete relaxation model for coarse-grained CFD-DEM Yaxiong YU Fan DUAN Yu ZHANG Qiang ZHOU The Chinese Journal of Process Engineering    2022, 22 (12): 1652-1665.   DOI: 10.12034/j.issn.1009-606X.222036 Abstract （192）   HTML （3）    PDF （2424KB）（140）       Knowledge map    Save Direct application of computational fluid dynamics and discrete element method (CFD-DEM) in industrial applications is unfeasible due to the enormous number of particles. As a result, the coarse-grained CFD-DEM (CFD-CGDEM) is proposed, which could save time and money by lumping a cloud of real particles into a coarse particle. However, due to its under-prediction of collisional energy dissipation, CFD-CGDEM typically over-predicts granular temperature and solid stresses when compared to CFD-DEM. As a result, in CFD-CGDEM simulations, a coarse-grained model capable of increasing energy dissipation is necessary. This work developed a coarse-grained model called discrete relaxation model based on the granular kinetic theory in the homogeneous cooling system (HCSs). By putting dissipation forces on the particle-pair, the discrete relaxation model could increase the energy dissipation between them. The proposed model eliminates errors in the estimation of local average solid phase velocity and granular temperature, as compared to Yu et al.'s relaxation model (Ind. Eng. Chem. Res., 2021, 60(15): 5651-5664). A posteriori simulations on homogeneous cooling systems and bubbling fluidized beds were used to assess the proposed model. It was discovered that CGDEM with the proposed model produced a more accurate forecast of the instantaneous granular temperature in HCSs than CGDEM with the usual coarsening model which was unable to improve energy dissipation. Furthermore, when compared to CFD-CGDEM with Yu et al.'s model and that with usual coarsening model, CFD-CGDEM with the proposed model better reproduced the time-averaged fields generated by CFD-DEM simulation for the considered bubbling fluidized bed. This emphasized the significance of increasing energy dissipation in CFD-CGDEM simulations, as well as the potential of the proposed model to considerably increase simulation accuracy. Related Articles | Metrics

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Rigorous modelling and energy performance evaluation for PDH reaction gas separation and hydrogen purification Xuantong LU Jin ZHAO Chun DENG The Chinese Journal of Process Engineering    2023, 23 (1): 144-153.   DOI: 10.12034/j.issn.1009-606X.221334 Abstract （360）   HTML （2）    PDF （1123KB）（131）       Knowledge map    Save Propane dehydrogenation is one of the main processes for propylene production and its reaction gas components are complex, containing products from main reactions and by-product components such as CO2 and CO from side reactions. To obtain polymer grade propylene and purified hydrogen product with a purity of more than 99.90 mol/mol, the separation process of the reaction gas of propane dehydrogenation and the recovery of hydrogen from hydrogen-rich tail gas is modeled and simulated in the Aspen software. The process includes main modules such as MEA decarburization, compressed cryogenic separation, deethanization, propylene distillation and pressure swing adsorption. The CO2 contained in the reaction gas would affect the purity of the propylene product, and it is difficult to remove in the cryogenic process. Thus the CO2 is first removed by the MEA solvent absorption. The reaction gas after decarburization and dehydration enters the deethanizer and the propylene distillation unit, and the hydrogen-rich tail gas enters the pressure swing adsorption unit for further purification. In order to reasonably utilize the energy of the propylene distillation tower, the heat pump distillation process is adopted for the energy integration. Compared with conventional distillation, the energy consumption of propylene heat pump distillation is lower. Sensitivity analysis and optimization of process parameters for hydrogen recovery by pressure swing adsorption are carried out to improve economy and energy efficiency. For the two-bed four-step pressure swing adsorption process, the effects of adsorption pressure, adsorption time and purge ratio on the purity and recovery of hydrogen products are analyzed, and the optimal operating conditions are determined. The simulation results show propylene and hydrogen products meet the requirements. The energy consumption per unit product is 267.46 kg standard oil/t propylene product and 474.44 kg standard oil/t hydrogen product. It has a certain reference significance for the simulation of the actual propane dehydrogenation reaction gas separation process and energy consumption estimation. Related Articles | Metrics