烟煤化学链反应特性及机理分析

doi:10.12034/j.issn.1009-606X.219135

过程工程学报 ›› 2019, Vol. 19 ›› Issue (6): 1120-1128.DOI: 10.12034/j.issn.1009-606X.219135

烟煤化学链反应特性及机理分析

孙小青¹，陈朋¹，刘永卓¹，郭庆杰^1,2*

1. 青岛科技大学化工学院，清洁化工过程山东省高校重点实验室，山东青岛 266042 2. 宁夏大学省部共建煤炭高效利用与绿色化工国家重点实验室，宁夏银川 750021

收稿日期:2019-02-20 修回日期:2019-04-10 出版日期:2019-12-22 发布日期:2019-12-22
通讯作者: 郭庆杰 qjguo@qust.edu.cn
基金资助:
国家自然科学基金项目;宁夏重点研发计划重大项目

Analysis of chemical looping reaction characteristics and mechanism of bituminous coal

Xiaoqing SUN¹, Peng CHEN¹, Yongzhuo LIU¹, Qingjie GUO^1,2*

1. Key Laboratory of Clean Chemical Processing of Shandong Province, College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao, Shandong 266042, China 2. State Key Laboratory of High-efficiency Utilization of Coal & Green Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, China

Received:2019-02-20 Revised:2019-04-10 Online:2019-12-22 Published:2019-12-22
Contact: GUO Qing-jie qjguo@qust.edu.cn

摘要/Abstract

摘要： 在固定床反应器中添加铁基载氧体Fe4Al6和铜基载氧体Cu4Al6，进行巨野(JY)烟煤化学链燃烧实验，通过气相色谱(GC)、红外光谱(FT-IR)等分析了JY煤化学链反应特性及表面官能团演变规律。结果表明，相对于Al2O3，Fe4Al6或Cu4Al6为床料时，JY煤中CO2含量分别提高了52.25%和59.16%，最大碳转化速率分别提高了8.93%和30.36%，Cu4Al6反应效果更好。添加Cu4Al6后，JY煤表面官能团演变进程加快，Cu4Al6对脂肪烃结构、芳香碳骨架和芳香族CH的转化均有明显促进作用。煤中脂肪烃?CH3和?CH2稳定性低、反应速率快，是化学链燃烧初期气相产物主要来源；芳香碳骨架和芳香族?CH稳定性高、反应活性低，反应速率较缓慢，是化学链燃烧中后期气相产物主要来源。

关键词: 烟煤, 化学链燃烧, 官能团, 载氧体, FTIR

Abstract: Coal chemical looping combustion technology is one of the important technologies for the clean utilization of coal, which has received a lot of attention recently. A large number of studies have shown that the conversion properties of coal are closely related to its functional group structure. However, there are few studies on the relationship between the evolution of functional group and the characteristics of chemical looping reaction, especially the comparative studies on different types of oxygen carriers have not been reported so far. In order to explore the relationship between the functional group structure in coal and the characteristics of chemical looping combustion, the chemical looping combustion experiments of bituminous coal were carried out by means of the small fixed-bed reactor and Fourier infrared analyzer. The results showed that after adding iron-based oxygen carrier (Fe4Al6) or copper-based oxygen carrier (Cu4Al6), the CO2 concentration of Juye (JY) coal increased by 52.25% and 59.16%, respectively. The maximum carbon conversion rate increased by 8.93% and 30.36%, respectively. The reaction effect of Cu4Al6 was better. When Cu4Al6 was used as bed material, the evolution of surface functional groups in JY coal was accelerated, the reaction rates of aliphatic hydrocarbon structure, aromatic carbon skeleton and aromatic CH were significantly improved. Aliphatic ?CH3 and ?CH2 in coal were active, and reaction rate was quite fast, which were the main sources of gas phase products in the initial stage of chemical looping combustion. Aromatic carbon skeleton and aromatic CH were stable and inactive, and reaction rate was relatively slow, which were the main sources of gas phase products in the middle and late stages of chemical looping combustion.

Key words: bituminous coal, chemical-looping combustion, functional groups, oxygen carrier, FTIR

孙小青陈朋刘永卓郭庆杰. 烟煤化学链反应特性及机理分析[J]. 过程工程学报, 2019, 19(6): 1120-1128.

Xiaoqing SUN Peng CHEN Yongzhuo LIU Qingjie GUO. Analysis of chemical looping reaction characteristics and mechanism of bituminous coal[J]. Chin. J. Process Eng., 2019, 19(6): 1120-1128.

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烟煤化学链反应特性及机理分析

Analysis of chemical looping reaction characteristics and mechanism of bituminous coal

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