氨基酸盐SG溶液吸收烟道气中二氧化碳的研究
摘要
由于温室气体CO_2大量排放引发的环境问题日益严重以及CO_2潜在的资源性,开发出一种新型高效的吸收剂富集分离烟道气中CO_2正越来越引起人们的关注。本文通过对氨基酸盐SG单一溶液及其SG与位阻胺AMP的混合溶液吸收CO_2特性的研究,吸收动力学的初步探讨,和再生性能的研究,为更深入这方面的研究和工作应用提供必要的理论基础。
本文以双搅拌釜为反应吸收装置,采用浓度为1.0～4.0 kmol·m~(-3)SG单一溶液和不同浓度配比的AMP+SG混合溶液作为CO_2的吸收剂,通过对SG单一溶液和AMP+SG混合溶液吸收CO_2的反应速率的测定,考察了吸收量,吸收负荷随时间的变化关系,温度对于SG单一溶液和AMP+SG混合溶液吸收CO_2的影响,及在烟道气中混有400 mg·m~(-3)的SO_2对SG单一溶液吸收CO_2的影响。实验结果表明:1.5 kmol·m~(-3)AMP+0.6 kmol·m~(-3)SG混合溶液的吸收性能较优,烟道气中混有400 mg·m~(-3)的SO_2对SG单一溶液吸收CO_2的影响很小,SG单一溶液和AMP+SG混合溶液吸收CO_2的反应是快速拟一级反应。
以磁力搅拌恒温加热器作为再生装置,对SG单一溶液和AMP+SG混合溶液吸收CO_2富液再生性能分别进行考察。测定363 K到403 K再生温度下的再生效率及pH的变化规律。总结发现SG单一溶液的最佳再生温度为388 K,最佳再生时间为76 min。当再生温度从363 K上升到403 K时,SG单一溶液的再生效率从80.0%上升到92.6%。AMP+SG混合溶液的最佳再生温度为378 K。通过连续循环吸收再生实验,比较了单一溶液(SG、MEA、DEA、MDEA、AMP)和混合溶液(AMP+MEA,AMP+DEA,AMP+SG)的再生效率。发现单一溶液再生效率从大到小依次为:AMP＞MDEA＞SG＞DEA＞MEA。混合溶液的再生效率大小分别是:AMP+SG＞AMP+MEA＞AMP+DEA。研究结果表明:与常见的混合胺溶液相比,AMP+SG混合溶液是一种吸收性能和再生性能较为优秀的CO_2的吸收液。
CO_2 separation and capture has been extensively studied in recent years because of environmental concern of greenhouse effect and potential resources. The choice of absorbent has been focused on in the chemical absorption research. Features of single aqueous sodium glycinate (SG) and mixed solutions systems, absorption mechanism were studied, which may sever future study as groundwork.
Absorption performance of CO_2 into single aqueous SG (1.0～4.0 kmol·m~(-3)) and the aqueous blends of 2-amino-2-methyl-l-propanl (AMP) and SG were investigated at different temperatures (298～323 K) using a double stirred-cell absorber. The relationships between the absorption rate, absorption capacity and absorption time were analyzed. The results indicated that aqueous blends of 1.5 kmol·m~(-3) AMP and 0.6 kmol·m~(-3) SG was much more suitable as submarine-based CO_2 scrubbers. It was demonstrated that the kinetics region of absorption CO_2 into single aqueous SG and the aqueous blends of AMP and SG was the fast pseudo-first order reaction regime.
To determine its regeneration behavior, single aqueous SG and the aqueous blends of AMP and SG was investigated by the means of regeneration heating. The CO_2 absorption and regeneration characteristics were experimentally examined under various operating conditions. Experimental results showed that the regeneration efficiency of single aqueous SG increased from 80.0% to 92.6% during temperature range of 363 K to 403 K. The most suitable regeneration temperature and time for single aqueous solution are 388 K and 76 min respectively. The most suitable regeneration temperature for the aqueous blends of AMP and SG was 378 K in our experiment condition. Under the same experimental conditions, the regeneration efficiency can be ranked in the following order: AMP+SG>AMP+MEA>AMP+DEA. It was demonstrated that the aqueous blends of AMP and SG was easier to regenerate with saving energy and less loss of absorption capacity than other amines. It was concluded that the aqueous blends of AMP and SG was fitted for industry.
本文以双搅拌釜为反应吸收装置,采用浓度为1.0～4.0 kmol·m~(-3)SG单一溶液和不同浓度配比的AMP+SG混合溶液作为CO_2的吸收剂,通过对SG单一溶液和AMP+SG混合溶液吸收CO_2的反应速率的测定,考察了吸收量,吸收负荷随时间的变化关系,温度对于SG单一溶液和AMP+SG混合溶液吸收CO_2的影响,及在烟道气中混有400 mg·m~(-3)的SO_2对SG单一溶液吸收CO_2的影响。实验结果表明:1.5 kmol·m~(-3)AMP+0.6 kmol·m~(-3)SG混合溶液的吸收性能较优,烟道气中混有400 mg·m~(-3)的SO_2对SG单一溶液吸收CO_2的影响很小,SG单一溶液和AMP+SG混合溶液吸收CO_2的反应是快速拟一级反应。
以磁力搅拌恒温加热器作为再生装置,对SG单一溶液和AMP+SG混合溶液吸收CO_2富液再生性能分别进行考察。测定363 K到403 K再生温度下的再生效率及pH的变化规律。总结发现SG单一溶液的最佳再生温度为388 K,最佳再生时间为76 min。当再生温度从363 K上升到403 K时,SG单一溶液的再生效率从80.0%上升到92.6%。AMP+SG混合溶液的最佳再生温度为378 K。通过连续循环吸收再生实验,比较了单一溶液(SG、MEA、DEA、MDEA、AMP)和混合溶液(AMP+MEA,AMP+DEA,AMP+SG)的再生效率。发现单一溶液再生效率从大到小依次为:AMP＞MDEA＞SG＞DEA＞MEA。混合溶液的再生效率大小分别是:AMP+SG＞AMP+MEA＞AMP+DEA。研究结果表明:与常见的混合胺溶液相比,AMP+SG混合溶液是一种吸收性能和再生性能较为优秀的CO_2的吸收液。
CO_2 separation and capture has been extensively studied in recent years because of environmental concern of greenhouse effect and potential resources. The choice of absorbent has been focused on in the chemical absorption research. Features of single aqueous sodium glycinate (SG) and mixed solutions systems, absorption mechanism were studied, which may sever future study as groundwork.
Absorption performance of CO_2 into single aqueous SG (1.0～4.0 kmol·m~(-3)) and the aqueous blends of 2-amino-2-methyl-l-propanl (AMP) and SG were investigated at different temperatures (298～323 K) using a double stirred-cell absorber. The relationships between the absorption rate, absorption capacity and absorption time were analyzed. The results indicated that aqueous blends of 1.5 kmol·m~(-3) AMP and 0.6 kmol·m~(-3) SG was much more suitable as submarine-based CO_2 scrubbers. It was demonstrated that the kinetics region of absorption CO_2 into single aqueous SG and the aqueous blends of AMP and SG was the fast pseudo-first order reaction regime.
To determine its regeneration behavior, single aqueous SG and the aqueous blends of AMP and SG was investigated by the means of regeneration heating. The CO_2 absorption and regeneration characteristics were experimentally examined under various operating conditions. Experimental results showed that the regeneration efficiency of single aqueous SG increased from 80.0% to 92.6% during temperature range of 363 K to 403 K. The most suitable regeneration temperature and time for single aqueous solution are 388 K and 76 min respectively. The most suitable regeneration temperature for the aqueous blends of AMP and SG was 378 K in our experiment condition. Under the same experimental conditions, the regeneration efficiency can be ranked in the following order: AMP+SG>AMP+MEA>AMP+DEA. It was demonstrated that the aqueous blends of AMP and SG was easier to regenerate with saving energy and less loss of absorption capacity than other amines. It was concluded that the aqueous blends of AMP and SG was fitted for industry.
引文
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