Microwave regeneration of monoethanolamine aqueous solutions used for CO2 capture
Microwave regeneration of monoethanolamine aqueous solutions used for CO2 capture
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DOI：
10.1016/j.ijggc.2018.10.008
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发表时间：
2018-12
影响因子：
3.9
通讯作者：
F. Bougie;Xianfeng Fan
中科院分区：
文献类型：
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作者：
F. Bougie;Xianfeng Fan
胺类吸收剂广泛应用于燃烧后CO2捕集过程。为了汽提CO2，通常使用位于再生塔底部的蒸汽再沸器将溶液加热到约110-140 °C。在这项工作中，微波辐射作为一种新的替代加热和再生富CO2单乙醇胺（MEA）水溶液进行了研究。通过改变胺浓度、再生温度和微波初始功率等参数，考察了微波加热再生效率，并从回收CO2量和能耗两个方面寻找最佳实验条件，发现溶液的热容、粘度和CO2负载量是影响微波加热速率的主要因素.最佳的加热速率被发现为50重量%的MEA溶液和再生性能参数，基于CO2汽提量和微波能量吸收的溶液，也被发现是最佳的在这个浓度。使用50重量%的MEA溶液，而不是众所周知的30重量%，得到了13%的增加，在CO2循环容量，而再生能耗降低了15%，在这项工作中测试的最佳条件下。这些结果表明，50重量%的MEA溶液似乎提供了很大的潜力，在循环CO2吸收-微波再生过程。
Aqueous amine absorbents are widely used in post-combustion CO2capture processes. To strip the CO2, the solutions are usually heated around 110–140 °C using a steam reboiler located at the bottom of the regeneration column. In this work, microwave irradiation was studied as a new alternative to heat and regenerate CO2-rich monoethanolamine (MEA) aqueous solutions. Various parameters like the amine concentration, the regeneration temperature and the initial microwave power were modified to assess regeneration efficiencies by microwave heating and to find optimal experimental conditions in term of recovered CO2amount and energy consumption.The heating rate of solutions by microwave was found to be mostly influenced by their heat capacity, viscosity and CO2loading. The optimal heating rate was found for the 50 wt% MEA solution and regeneration performance parameters, based on the CO2stripped quantity and microwave energy absorbed by the solution, were also found to be optimal at this concentration. Using a 50 wt% MEA solution instead of the well-known 30 wt% gave a 13% increase in the CO2cyclic capacity while the regeneration energy consumption decreased by 15% under the optimal conditions tested in this work. These results indicate that the 50 wt% MEA solution seems to offer great potential in a cyclic CO2absorption-microwave regeneration process.