Absorption of SO2 in simulated flue gas with aqueous ionic liquid solutions

doi:10.11949/j.issn.0438-1157.20150156

CIESC Journal ›› 2015, Vol. 66 ›› Issue (S1): 222-227.DOI: 10.11949/j.issn.0438-1157.20150156

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Absorption of SO₂ in simulated flue gas with aqueous ionic liquid solutions

WANG Chenxing¹, REN Shuhang¹, HOU Yucui², WANG Yiming³, TIAN Shidong¹, WU Weize¹

1 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2 Department of Chemistry, Taiyuan Normal University, Taiyuan 030031, Shanxi, China;
3 College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China

Received:2015-02-02 Revised:2015-02-12 Online:2015-06-30 Published:2015-06-30
Supported by:
supported by the National Natural Science Foundation of China (21176020, 21306007).

离子液体水溶液吸收模拟烟气中SO₂

王晨星¹, 任树行¹, 侯玉翠², 王一鸣³, 田士东¹, 吴卫泽¹

1 北京化工大学化学工程学院, 化工资源有效利用国家重点实验室, 北京 100029;
2 太原师范学院化学系, 山西太原 030031;
3 中南大学化学化工学院, 湖南长沙 410083

通讯作者: 吴卫泽
基金资助:
国家自然科学基金项目(21176020, 21306007)。

Abstract

Abstract:

A large-scale desulfurization device was designed and made to investigate the absorption of SO₂ in simulated flue gas with aqueous ethanolamine lactate ([MEA]L) solutions at different conditions. The optimum conditions were found and circulatory SO₂ absorption-desorption experiment was performed on the device. The results showed that the SO₂ removal rate increased with an increase of water content of aqueous [MEA]L solution. The SO₂ removal rate increased with a decrease of the molar ratio of gas to liquid absorbent G/L). When G/L is 420 and the concentrations of SO₂ in flue gas are 2850—14280 mg·m^-3, the output concentration of SO₂ was under 285 mg·m^-3, which conforms to the standard of flue gas issue. CO₂ in the flue gas had no effect on absorption SO₂ with aqueous [MEA]L solutions. Furthermore, the solution after SO₂ absorption could be regenerated by stream stripping, and reused for absorbing SO₂ with a high removal rate.

Key words: ionic liquids, ethanolamine lactate, aqueous solution, absorption, desorption, SO₂

摘要：

建立了一套放大脱硫装置, 利用该装置研究了乙醇胺乳酸盐([MEA]L)水溶液在不同条件下吸收SO₂的性能, 确定出了较优的实验条件, 并在该条件下进行吸收-解吸SO₂循环实验。研究结果表明:烟气中SO₂的去除率随[MEA]L中水分的增加而增加;SO₂的去除率随着气液比的减少而增加, 在气液比为420, SO₂浓度为2850～14280 mg·m^-3范围内时, 出口烟气中SO₂浓度均小于285 mg·m^-3, 满足排放标准;烟气中的CO₂对[MEA]L水溶液吸收SO₂没有影响;利用蒸汽对富液进行解吸再生, 解吸后的贫液可以继续使用, 并且仍具有很高的SO₂去除率。

关键词: 离子液体, 乙醇胺乳酸盐, 水溶液, 吸收, 解吸, SO₂

CLC Number:

TQ534.9

WANG Chenxing, REN Shuhang, HOU Yucui, WANG Yiming, TIAN Shidong, WU Weize. Absorption of SO₂ in simulated flue gas with aqueous ionic liquid solutions[J]. CIESC Journal, 2015, 66(S1): 222-227.

王晨星, 任树行, 侯玉翠, 王一鸣, 田士东, 吴卫泽. 离子液体水溶液吸收模拟烟气中SO₂[J]. 化工学报, 2015, 66(S1): 222-227.

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Absorption of SO₂ in simulated flue gas with aqueous ionic liquid solutions

离子液体水溶液吸收模拟烟气中SO₂

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