热电厂烟道气中CO2分离无机膜的制备  

Preparation of Inorganic Membrane for CO 2 Separation in Flue Gas of Thermal Power Plant

作　　者：庄淑娟 宋峰 ZHUANG Shu-juan;SONG Feng(School of Chemistry and Chemical Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]山东理工大学化学化工学院,淄博255000

出　　处：《科学技术与工程》2020年第28期11706-11710,共5页Science Technology and Engineering

基　　金：国家自然科学基金(21176146,21276147)。

摘　　要：利用溶胶凝胶法制备氧化物粉体前驱体,然后高温焙烧得到具有钙钛矿结构的粉体,利用相转化-烧结技术制备中空纤维膜。将碳酸盐按照一定比例混合制得低共熔体,在高温熔融条件浸渍制备双相膜。该膜具有氧化物相和碳酸盐相,在高温下碳酸盐相可以通过碳酸根离子进行传导,而氧离子则通过钙钛矿相进行传递,从而完成对CO 2的分离。把双相膜安装在自制反应器中,在膜内外分别通入氦气作为吹扫气和烟道气,并将尾气通过气相色谱在线监测气体中的组成,然后通过计算得出CO 2的高温透过量,实验结果表明在850℃的CO 2透量最高为1.221 mL/(cm 2·min),为热电厂烟道气的处理提供了一种新的思路。The La0.6S0.4Co0.2Fe0.8O3-δ(LSCF)powders were prepared by the sol-gel method,and then calcined at high temperature.The polyethersulfone(PESf)was dissolved by using N-methyl pyrrolidone(NMP)as solvent,and the powders were added to stir to obtain a fluid casting film.The hollow fiber membranes were prepared by the phase inversion-sintering technology,and sintered at high temperature to obtain a porous hollow fiber membrane with perovskite structure.The eutectic was prepared by mixing the carbonates according to a certain ratio,and the hollow fiber membrane was impregnated under high temperature melting conditions for several minutes to prepare a dual-phase membrane.The membrane consisted of two phases of an oxide phase and a carbonate phase.At high temperature,the carbonate phase could be conducted through carbonate ions,while the oxygen cations were transmitted through the perovskite phase,thereby completing the separation of CO 2.Through the simulation of the flue gas,the prepared dual-phase membrane was installed in a self-made reactor,and helium gas was passed into the membrane as both the purge gas and the flue gas as raw gas,and the tail gas was monitored online by gas chromatography.Then the high-temperature permeability of CO 2 was calculated.The experimental results show that the maximum permeability at 850℃is 1.221 mL/(cm 2·min),which provides a new idea for the treatment of flue gas in thermal power plants.

关 键 词：二氧化碳 分离 膜 烟道气 制备 

分 类 号：TQ028[化学工程]