PI中空纤维膜分离模拟燃煤脱硫烟气中的CO_2  

CO_2 Separation by PI Hollow Fiber Membrane From Desulfurized Flue Gas

作　　者：张琳[1] 胡斌[1] 王霞[2] 李娟[1] 周心澄[1] 杨林军[3] 

机构地区：[1]能源热转换及其过程测控教育部重点实验室东南大学,江苏省南京市210096 [2]江苏省交通规划设计院股份有限公司,江苏省南京市210014 [3]江苏省煤基CO2捕集与地质储存重点实验室(中国矿业大学),江苏省徐州市221008

出　　处：《中国电机工程学报》2017年第9期2637-2643,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51176034);江苏省煤基CO2捕集与地址储存重点实验室开放基金(2016A05);江苏省普通高校研究生科研创新计划项目(KYLX15-0072)~~

摘　　要：利用自主搭建的膜分离CO_2模拟实验台,模拟实际燃煤湿法脱硫净烟气环境,研究了自制聚酰亚胺(PI)中空纤维膜分离CO_2的性能。考察渗余侧气体流量、分离压力和烟气温度对膜分离CO_2性能的影响;研究PI中空纤维膜在含有燃煤飞灰细颗粒物的脱硫烟气条件下的分离性能;此外,利用原子力显微镜(AFM)和扫描电镜(SEM)探究了燃煤飞灰细颗粒物在PI中空纤维膜上的吸附和沉积,及其对分离膜微结构的影响。结果表明,渗余侧气体流量增加,分离压力增加及升高操作温度均可提高PI中空纤维膜对CO_2的分离性能;燃煤飞灰细颗粒物存在时,膜分离CO_2的性能明显下降,PI中空纤维膜的分离因子和渗透速率均有不同程度减少;在长时间与飞灰接触的情况下,PI中空纤维膜表面被大量的细颗粒附着,其表面形貌及微结构受到严重破坏,导致膜的有效接触面积减小,传质阻力增加。The C02 separations by PI hollow fiber membrane from desulfurized flue gas were investigated over a self-builded simulating membrane test-bed. The PI hollow fiber membrane module was homemade. The feed gas pressure, the residual gas flow rate and the temperature were tested to optimize the operating conditions. At the optimized operating conditions, the effects of fly-ash fine particles on the performance of the PI hollow fiber membrane was studied. Moreover, the adhesion of fly-ash particles on membrane and the effects to membrane micro-structure were studied using scanning electron microscope （SEM） and atomic force microscope （AFM）. The results indicate that the increasing of residual gas flow rate, the higher pressure and temperature benefited the separation performance of PI hollow fiber membrane. The CO2/N2 selectivity and permeation rate of PI membrane decrease significantly at the presence of fly-ash particles. The morphology of membrane surface is destroyed by the deposited particles so that the efficient contact area decrease dramatically and mass transfer resistance is enhanced.

关 键 词：PI中空纤维膜 CO2捕集 分离性能 细颗粒物 脱硫烟气 

分 类 号：TQ028[化学工程]