MEA吸收剂与设备匹配性实验研究

吸收剂的性能与能耗制约着电厂烟气CO_2捕集的大规模推广,为推广其使用,采用实验的方法对吸收剂性能进行研究。以2-羟基乙胺(MEA)溶液为研究对象,采用搅拌装置考察了MEA溶液在不同浓度、温度下的吸收、解吸性能。实验结果表明:(1)15 wt%的MEA溶液对CO_2的吸收量较高,且具有较低的解吸能耗;(2)溶液温度80℃左右时,三种不同浓度的MEA溶液解吸速率均达到最高,且解吸速率随溶液浓度的增大而显著提高;(3)20 wt%的MEA溶液有较好的吸收速率。

多种有机胺吸收剂循环利用实验研究

在化学吸收法捕集CO_2的工艺中,吸收剂都是循环使用的。过去的吸收剂性能测定实验通常是测定吸收剂单次使用的性能,而对于吸收剂多次循环之后的性能变化很少提及。以单乙醇胺(MEA)、二乙醇胺(DEA)、三乙醇胺(TEA)、羟乙基乙二胺(AEE)溶液为研究对象,对有机胺溶液多次使用后的吸收与解吸性能进行实验分析测定。实验结果表明:随着循环次数的增加,AEE溶液吸收速度下降明显,而MEA、DEA、TEA溶液经过多次循环后的吸收速率与解吸速率变化不大;随着循环次数的增加,各种有机胺吸收剂的解吸能耗变化大小依次为MEA>DEA>TEA>AEE;AEE溶液在多次循环反应过程中的解吸能耗变化最小。

高浓度MEA吸收剂捕集CO_(2)技术流程分析

二氧化碳普及吸收技术应用需要结合具体工艺流程进行相关数据指标系统性分析,研究高浓度吸收剂捕集二氧化碳技术流程,意在寻找二氧化碳普及吸收技术优化要点,并且为取得更好的普及吸收质量奠定基础。通过该文实践分析可知,高浓度MEA吸收剂捕集二氧化碳技术流程需要模拟构建模型、优化捕集吸收工艺流程并计算分析基础参数,可为取得更好的二氧化碳普及吸收效果提供保障。

The effect of membrane pores wettability on CO_2 removal from CO_2/CH_4 gaseous mixture using NaOH, MEA and TEA liquid absorbents in hollow fiber membrane contactor

The present paper renders a modeling and a 2D numerical simulation for the removal of CO_2from CO_2/CH_4gaseous stream utilizing sodium hydroxide(NaOH),monoethanolamine(MEA)and triethanolamine(TEA)liquid absorbents inside the hollow fiber membrane contactor.Counter-current arrangement of absorbing agents and CO_2/CH_4gaseous mixture flows are implemented in the modeling and numerical simulation.Non-wetting and partial wetting modes of operation are considered where in the partial wetting mode,CO_2/CH_4gaseous mixture and liquid absorbents fill the membrane pores.The deteriorated removal of CO_2in the partial wetting mode of operation is mainly due to the mass transfer resistance imposed by the liquid in the pores of membrane.The validation of numerical simulation is done based on the comparison of simulation results of CO_2removal using Na OH and experimental data under non-wetting mode of operation.The comparison illustrates a desirable agreement with an average deviation of less than 5%.According to the results,MEA provides higher efficiency for CO_2removal in comparison with the other liquid absorbents.The order for CO_2removal performance is MEAN Na OHN TEA.The influence of non-wetting and partial wetting modes of operation on CO_2removal are evaluated in this article as one of the novelties.Besides,the percentage of CO_2sequestration as a function of gas velocity for various percentages of membrane pores wetting ranging from 0(non-wetting mode of operation)to 100%(complete wetting mode of operation)is studied in this research paper,which can be proposed as the other novelty.The results indicate that increase in some operational parameters such as module length,membrane porosity and absorbents concentration encourage the removal percentage of CO_2from CO_2/CH_4gaseous mixture while increasing in membrane tortuosity,gas velocity and initial CO_2concentration has unfavorable influence on the separation efficiency of CO_2.