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混合吸收剂膜减压再生特性的试验研究

, PP. 61-67

Keywords: 化学吸收,混合吸收剂,聚丙烯,中空纤维膜接触器,二氧化碳,减压再生

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Abstract:

针对现有基于醇胺类溶液的化学吸收分离燃煤电厂烟气CO2技术能耗高的问题,对新型混合胺吸收剂膜减压再生进行研究,以期大幅度降低再生能耗。文中采用聚丙烯中空纤维膜接触器作为再生装置。混合胺吸收剂是以乙醇胺(MEA)为基础,添加羟乙基乙二胺(AEEA)、三乙烯四胺(TETA)、二乙烯三胺(DETA)、2-氨基-2-甲基丙醇(AMP)、哌嗪(PZ)、N-甲基二乙醇胺(MDEA),按30%质量分数配比而成。实验研究了不同吹扫蒸汽流量,不同再生温度对于混合胺吸收剂再生特性的影响,并将混合吸收剂膜减压再生能耗与传统热再生进行比较。实验表明:在80℃再生温度条件下,15%MEA+15%MDEA混合吸收剂再生程度最高,为45.9%;20%MEA+10%AMP混合吸收剂的再生传质速率为1.34mol/(m2h),相比30%MEA提高了63.4%。再生能耗方面,70℃再生温度并且不考虑吹扫蒸汽作用下,20%MEA+10%AMP的再生过程电耗最低,仅为732.6kJe/kg(CO2)。综合再生程度,再生传质速率以及再生能耗表现,可以看出MEA+AMP系列混合吸收剂是更好的选择。

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