适用于湿法再生的CO_(2)吸附膜材料性能优化与分析  

Properties Optimization and Analysis of CO_(2)Adsorption Membrane Material in Moisture Swing Technology

作　　者：刘军 张梦瑶 王为术 梁陈洋 王秋红 LIU Jun;ZHANG Mengyao;WANG Weishu;LIANG Chenyang;WANG Qiuhong(School of Electric Power,North China University of Water Resources and Electric Power,Zhengzhou 450045,Henan Province,China)

机构地区：[1]华北水利水电大学电力学院,河南省郑州市450045

出　　处：《中国电机工程学报》2023年第3期1106-1113,共8页Proceedings of the CSEE

基　　金：河南省重点研发与推广专项项目(202102310557,212102311053)。

摘　　要：湿法再生CO_(2)捕集技术利用水的蒸发自由能实现吸附剂的再生,可解决传统变温吸附CO_(2)再生能耗高的难题,在空气CO_(2)直接捕集领域受到广泛关注。针对湿法再生CO_(2)捕集材料种类少、性能差的现状,该文采用相转化法制备异相CO_(2)吸附薄膜,通过膜材料微观结构表征,对比分析聚醚砜(polyether sulfone,PES)分子量、聚乙二醇(polyethylene glycol,PEG)分子量及PEG与PES配比对膜材料内部微观结构及比表面积、孔体积等性能参数的影响。结果表明:采用分子量较小的PES–3200p制备的膜材料,其内部的孔径及孔的数量明显增加,比表面积增大,有利于CO_(2)在膜材料中扩散。加入分子量较大的PEG–4000时,膜材料内部孔隙率明显增加,具有更大的比表面积及孔体积。随膜材料中PEG添加量增加,膜材料比表面积逐渐减小,表面孔径呈先增大后减小趋势。CO_(2)吸附性能测试结果表明:所制备膜材料的CO_(2)半吸附时间仅为3~6min,动力学性能得到大幅提升。研究结果可为湿法再生吸附材料性能优化及湿法再生技术的大规模应用提供指导。The evaporation free energy of water is used to realize the regeneration of adsorbent in moisture swing CO_(2)capture technology,which can solve the problem of high energy consumption in the CO_(2)regeneration of traditional temperature swing technology,and has been widely concerned in the field of direct air CO_(2)capture.In light of the current situation of limited types and poor performance of CO_(2)capture materials for moisture swing technology,heterogeneous CO_(2)adsorption membrane is prepared by phase transformation method.The effects of PES molecular weight,PEG molecular weight and the proportion of PEG to PES on the internal microstructure,specific surface area,pore volume of the membrane are compared and analyzed.The results show that the pore size and the number of pores in the membrane material prepared by PES-3200p with low molecular weight increase obviously,and the specific surface area also increases,which is conducive to the diffusion of CO_(2)in the membrane material.When PEG-4000 with higher molecular weight is used,the internal porosity of the membrane material increases obviously,and the specific surface area and pore volume are larger.As the content of PEG increases,the specific surface area of the membrane decreases gradually,and the pore size increases first and then decreases.The test results of CO_(2)adsorption performance show that the half-adsorption time of CO_(2)adsorption is only 3~6min,and the kinetic performance of the prepared membrane is significantly improved.The research results can provide guidance for the properties optimization of moisture swing CO_(2)adsorption membrane materials and large-scale application of moisture swing technology.

关 键 词：湿法再生 CO_(2)捕集 材料制备 性能优化 膜材料 

分 类 号：TM61[电气工程—电力系统及自动化]