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氨水溶液同时吸收烟气中SO2和CO2的实验及模拟

清华大学 辅仁网/2017-07-07

氨水溶液同时吸收烟气中SO2和CO2的实验及模拟
齐国杰, 王淑娟, 高巨宝, 刘今朝, 赵博, 禚玉群, 陈昌和
清华大学 热能工程系, 热科学与动力工程教育部重点实验室, 二氧化碳资源化利用与减排技术北京市重点实验室, 北京 100084
Simultaneous absorption of SO2 and CO2 from flue gas using aqueous ammonia
QI Guojie, WANG Shujuan, GAO Jubao, LIU Jinzhao, ZHAO Bo, ZHUO Yuqun, CHEN Changhe
Beijing Key Laboratory for CO2 Utilization and Reduction Technology, Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

摘要:

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摘要燃煤电厂排放大量SO2和CO2等气态污染物,相应的减排技术研究十分必要。利用湿壁塔实验台对氨水溶液(质量分数为0.2%~7%)同时吸收SO2和CO2的传质特性进行了实验研究,并结合Aspen Plus速率模型分析了填料塔的吸收性能,对氨水溶液同时吸收SO2和CO2吸收系统的设计做了必要的探讨。实验结果表明:随着CO2体积分数(5%~20%)的增加,SO2选择性吸收因子有所降低,SO2的传质系数变化较小且均高于CO2的传质速率一个数量级;SO2质量浓度(0~11428 mg/m3)和反应温度(20~80℃)的增加,对CO2的吸收产生不利影响,氨水溶液趋向于选择性吸收SO2。氨水溶液中SO2负载量(SO2在氨水溶液中相对NH3的摩尔浓度)在0.1~0.4之间增加时,CO2的传质系数大幅降低。氨水溶液质量分数增加对CO2及SO2的吸收传质均有利,选择性吸收因子降低,且实验值和模型计算值符合良好。采用同时吸收SO2和CO2的填料吸收塔,结合控制氨挥发的氨洗塔及用于SO2负载控制的离子交换装置的吸收系统,可以实现污染物的有效脱除。
关键词 脱碳,脱硫,同时吸收,氨水,CO2,SO2
Abstract:Coal-fired power plants emit large quantities of SO2 and CO2, so more research is needed on SO2 and CO2 capture. Experimental tests were conducted in a wetted wall column system to analyze the simultaneous absorption of SO2 and CO2 using aqueous ammonia (weight percent, 0.2%-7%). The Aspen Plus RateSep model was then used to analyze the CO2 and SO2 mass transfer in the packed column to comprise the design of the ammonia based CO2 and SO2 absorption system. The experiments show that the SO2 selectivity absorption factor decreases as the CO2 volume concentration increases. The CO2 volume concentration (5%-20%) has little effect on the SO2 mass transfer and the SO2 absorption rate is always an order of magnitude higher than that of CO2. Increasing the SO2 mass concentration and reaction temperature has a negative effect on the CO2 absorption and the ammonia tends to selectively absorb the SO2. When the SO2 loading (mole concentration ratio between SO2 and NH3 in the aqueous ammonia solvent) increases from 0.1 to 0.4, the CO2 mass transfer rate significantly decreases. Increasing the ammonia mass concentration improves the absorption of both CO2 and SO2 and the predicted results are in good agreement with the experimental data. Thus, the packed column combined with an ammonia scrubber to reduce the ammonia slip and a resin exchange device used to control the SO2 loading can achieve simultaneous removal of CO2 and SO2.
Key wordsCO2 capturedesulfurationsimultaneous absorptionammoniaCO2SO2
收稿日期: 2012-08-25 出版日期: 2016-08-23
ZTFLH:TK284.9
通讯作者:王淑娟,副教授,E-mail:wangshuj@tsinghua.edu.cnE-mail: wangshuj@tsinghua.edu.cn
引用本文:
齐国杰, 王淑娟, 高巨宝, 刘今朝, 赵博, 禚玉群, 陈昌和. 氨水溶液同时吸收烟气中SO2和CO2的实验及模拟[J]. 清华大学学报(自然科学版), 2016, 56(8): 885-892.
QI Guojie, WANG Shujuan, GAO Jubao, LIU Jinzhao, ZHAO Bo, ZHUO Yuqun, CHEN Changhe. Simultaneous absorption of SO2 and CO2 from flue gas using aqueous ammonia. Journal of Tsinghua University(Science and Technology), 2016, 56(8): 885-892.
链接本文:
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.25.030 http://jst.tsinghuajournals.com/CN/Y2016/V56/I8/885


图表:
图1 湿壁塔实验系统图
表1 氨水溶液同时吸收SO2 和CO2 的吸收塔模型参数
表2 CO2 体积分数对KG,CO2KG,SO2S 的影响
表3 SO2 质量浓度对KG,CO2KG,SO2S 的影响
表4 反应温度对KG,CO2KG,SO2S 的影响
图2 SO2 负载量对NCO2KG,CO2 的影响
表5 氨水质量分数对CO2 和SO2 传质性能的影响
图3 氨水质量分数对KG,CO2 影响的实验及模拟对比
图4 氨水质量分数对S 影响的实验及模拟对比
图5 气相成分沿填料吸收塔高的摩尔分数
图6 CO2 和SO2 同时吸收系统流程


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