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

• 分离工程 • 上一篇    下一篇

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. 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
  • 收稿日期:2015-02-02 修回日期:2015-02-12 出版日期:2015-06-30 发布日期:2015-06-30
  • 通讯作者: 吴卫泽
  • 基金资助:

    国家自然科学基金项目(21176020, 21306007)。

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. 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).

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

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

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