文丘里洗涤器内硫化氢气体碱液吸收过程的CFD模拟

doi:10.12034/j.issn.1009-606X.20180105

过程工程学报 ›› 2018, Vol. 18 ›› Issue (S1): 103-110.DOI: 10.12034/j.issn.1009-606X.20180105CSTR: 32067.14.jproeng.180105

文丘里洗涤器内硫化氢气体碱液吸收过程的CFD模拟

杨帅¹，赵祥迪¹，徐银谋^1,2，王正¹，袁纪武¹，孙万付^1*

1. 中国石化青岛安全工程研究院化学品安全控制国家重点实验室，山东青岛 266071 2. 青岛科技大学机电工程学院，山东青岛 266042

收稿日期:2018-03-29 修回日期:2018-07-24 出版日期:2018-11-22 发布日期:2018-11-19
通讯作者: 杨帅 yangs.qday@sinopec.com
基金资助:
国家科技支撑计划课题

CFD simulation of hydrogen sulfide gas absorption process in Venturi scrubber

Shuai YANG¹, Xiangdi ZHAO¹, Yinmou XU^1,2, Zheng WANG¹, Jiwu YUAN¹, Wanfu SUN^1*

1. SINOPEC Research Institute of Safety Engineering, State Key Laboratory of Safety and Control for Chemicals, Qingdao, Shandong 266071, China 2. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266061, China

Received:2018-03-29 Revised:2018-07-24 Online:2018-11-22 Published:2018-11-19

摘要/Abstract

摘要： 采用双流体模型、RNG k??湍流模型和组分输运模型对不同工况下自吸式文丘里洗涤器内NaOH溶液洗消H2S气体的引射能力、气液混合度和洗涤效率进行数值模拟，对引射量的模拟结果进行了实验验证. 结果表明，在气液流动过程中，随气速增大，自吸式文丘里洗涤器引射量增大，洗涤器扩大段内液相径向分布均匀性减弱，液相倾向于贴壁流动. 距喉部越远，气液速度越低，液相径向分散越均匀. 在H2S碱液吸收过程中，气液相间化学反应主要集中于喉部至喉部上方扩大段长度1/5区域内，反应速率随距喉部距离增加先升高后降低. 最大反应速率在喉部上方扩大段长度5%处. 随气速增大，扩大段内气液相间化学反应速率提高，洗涤器出口处H2S浓度降低，洗涤效率增大，洗涤时间缩短.

Abstract: Venturi scrubbers are widely applied in gas adsorption and industrial dedusting fields as they have advantages of simple structure, high efficiency and convenient operation. Nowadays, computational fluid dynamics (CFD) method has become a more efficient and useful tool to explore the gas liquid flow characteristics and mass transfer process in Venturi scrubbers as the development of computing ability. Based on the process of hydrogen sulfide gas absorption by sodium hydroxide solution in a self-priming Venturi scrubber, the injection ability, mixing degree as well as scrubbing efficiency at different operation conditions were studied by using the two fluid models, the RNG k?? turbulent model and the species transport model in CFD method. The accuracy of simulated injection flow rates were verified by the experimental data. The simulation results showed that, with increase of gas velocity, the injection flow rate increased, but the homogeneity of radial liquid dispersion in the diffuser became worse. The liquid phase was inclined to flow near the wall, which did not benefit for the hydrogen sulfide absorption process. With the increase of the distance above the throat, the velocities of gas and liquid decreased, resulting in more uniform radial liquid dispersion. In the hydrogen sulfide absorption process, the interphase chemical reaction mainly occurred in one fifth of the diffuser above the throat. In this area, the interphase chemical reaction rate increased and then decreased with the increasing distance above the throat. Therefore, the highest chemical reaction rate did not occur at the throat, but at nearly 5% of the diffuser above the throat. As the gas velocity increased, the interphase chemical reaction rate and scrubbing efficiency became higher, while the hydrogen sulfide concentration and scrubbing time decreased. The research findings provided the basis for the optimization of structure parameters and operation conditions in self-priming Venturi scrubbers.

Key words: Venturi scrubber, CFD, Injection flow rate, Multiphase reaction, Scrubbing efficiency

杨帅赵祥迪徐银谋王正袁纪武孙万付. 文丘里洗涤器内硫化氢气体碱液吸收过程的CFD模拟[J]. 过程工程学报, 2018, 18(S1): 103-110.

Shuai YANG Xiangdi ZHAO Yinmou XU Zheng WANG Jiwu YUAN Wanfu SUN. CFD simulation of hydrogen sulfide gas absorption process in Venturi scrubber[J]. Chin. J. Process Eng., 2018, 18(S1): 103-110.

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文丘里洗涤器内硫化氢气体碱液吸收过程的CFD模拟

CFD simulation of hydrogen sulfide gas absorption process in Venturi scrubber

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