Falling film absorption of CO2 into ionic liquid-MEA mixed solutions with different flow patterns

doi:10.11949/j.issn.0438-1157.20141597

CIESC Journal ›› 2015, Vol. 66 ›› Issue (5): 1760-1766.DOI: 10.11949/j.issn.0438-1157.20141597

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Falling film absorption of CO₂into ionic liquid-MEA mixed solutions with different flow patterns

ZHANG Fangfang², DING Yudong^1,2, ZHU Xun^1,2, LIAO Qiang^1,2, WANG Hong^1,2, ZHAO Linlin²

1 Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China;
2 Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Received:2014-10-23 Revised:2015-01-23 Online:2015-05-05 Published:2015-05-05
Supported by:
supported by the National Natural Science Foundation of China (51276205, 51136007) and the Fundamental Research Funds for the Central Universities (CDJZR12140035).

不同流型下离子液体-MEA复合工质降膜吸收CO₂特性

张芳芳², 丁玉栋^1,2, 朱恂^1,2, 廖强^1,2, 王宏^1,2, 赵林林²

1 重庆大学低品位能源利用技术及系统教育部重点实验室, 重庆 400030;
2 重庆大学工程热物理研究所, 重庆 400030

通讯作者: 丁玉栋
基金资助:
国家自然科学基金项目(51276205,51136007);中央高校基本科研业务费科研专项自然科学类项目(CDJZR12140035)。

Abstract

Abstract: Carbon dioxide absorption into a mixed aqueous solution of functional ionic liquid, tetramethyl ammonium glycinate ([N₁₁₁₁][Gly]) and monoethanolamine (MEA) was performed in a plate falling film reactor with different flow patterns. The effect of countercurrent gas flow on flow pattern transition was investigated. Absorption of carbon dioxide into the mixed aqueous solution of MEA and [N₁₁₁₁][Gly] was studied with different liquid flow rates, liquid temperatures, gas flow rates and inlet carbon dioxide concentrations. Falling liquid film was found to take the patterns of corner rivulet flow, falling film flow with dry patches, and complete falling film flow depending on gas and liquid flow rates. Reduction of gas flow rate could lower critical flow rate of pattern transition. Absorption rate increased with increasing liquid flow rate with flow patterns of corner rivulet flow and falling film flow with dry patches, and then became unchanged with the pattern of complete falling film flow. CO₂ absorption rate reached a maximum with the pattern of complete falling film flow, however, corner rivulet flow had the largest liquid phase mass transfer coefficient.

Key words: falling film absorption, flow pattern, ionic liquid, monoethanolamine, carbon dioxide

摘要： 以氨基酸离子液体和乙醇胺混合水溶液为吸收剂研究逆流气体对竖直平板降膜流型转换的影响,考察了3种流型下液体流量和入口温度、气体流量和进口CO₂浓度对CO₂吸收性能的影响。结果表明:随着液体流量的增加,液膜呈现溪流、片状流和完整流3种流型,降膜流型转换临界流量随逆流气体流量增大而增加;溪流和片状流时CO₂吸收速率随液体流量的增加而增加,但在完整流条件下基本不变;完整流下具有较高的CO₂吸收速率,然而溪流下的液相传质系数最高。

关键词: 降膜吸收, 流型, 离子液体, 乙醇胺, 二氧化碳

CLC Number:

TK09

ZHANG Fangfang, DING Yudong, ZHU Xun, LIAO Qiang, WANG Hong, ZHAO Linlin. Falling film absorption of CO₂into ionic liquid-MEA mixed solutions with different flow patterns[J]. CIESC Journal, 2015, 66(5): 1760-1766.

张芳芳, 丁玉栋, 朱恂, 廖强, 王宏, 赵林林. 不同流型下离子液体-MEA复合工质降膜吸收CO₂特性[J]. 化工学报, 2015, 66(5): 1760-1766.

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Falling film absorption of CO₂into ionic liquid-MEA mixed solutions with different flow patterns

不同流型下离子液体-MEA复合工质降膜吸收CO₂特性

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