燃煤烟气中共存杂质对膜分离CO_2性能影响的实验研究  

Effects of the coexistent impurities in the flue gas on CO_2 separation by membranes

作　　者：王霞[1] 陈浩[1] 瞿如敏[1] 张琳[1] 杨林军[1] 

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《燃料化学学报》2015年第1期100-107,共8页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(51176034)

摘　　要：利用自行搭建的膜分离实验台,考察了共存气态组分以及颗粒物对于聚二甲基硅氧烷/聚砜(PDMS-PSF)复合膜分离CO2性能的影响。结果表明,共存气态组分中O2对于膜分离CO2有抑制作用;由于SO2浓度显著低于CO2,在短时间内对膜分离CO2没影响;水汽可以促进CO2的分离;燃煤飞灰细颗粒在分离膜表面沉积会导致膜性能的恶化。在此基础上,采用模拟湿法烟气脱硫系统装置,进行了燃煤湿法脱硫净烟气环境下的膜分离CO2实验;在测试的50 h以内,水汽、SO2和O2的共同作用导致膜分离性能在前期有一定的提高,随着运行时间的延长,细颗粒物对膜的影响程度加大,导致PDMS-PSF复合膜的分离性能逐渐恶化,最终导致膜的CO2/N2分离因子和CO2渗透速率分别下降了17.91%和28.21%。The effects of coexistent gaseous components and fine particles on the CO2 separation performance by polydimethylsiloxane/polysulfon（PDM S-PSF） flat sheet composite membranes were investigated in a simulated test-bed. It can be found that O2 slightly inhibits the CO2 separation performance,w hile the effect of SO2 is negligible during the test time due to its low concentration in the flue gas. Water vapor promotes the CO2 separation performance of PDM S-PSF composite membranes. The fly ash fine particles significantly deteriorate the CO2 separation performance of PDM S-PSF membranes. Moreover,the CO2 separation experiments by PDM S-PSF membranes with an actual flue gas from a desulfurization system of the coal-fired hot testing facility were conducted for 50 h. At the beginning,the CO2 separation performance is slightly improved due to the combined effect of water vapor,O2 and SO2. With the extension of the test time,the impact of the fine particles deposited on the membrane surface increases,w hich gradually deteriorates the CO2 separation performance of PDM S-PSF membrane. The CO2/N2 selectivity and the CO2 permeation rate are decreased by 17. 91% and28. 21%,respectively.

关 键 词：CO2分离 PDMS-PSF复合膜 共存气态组分 颗粒物 影响 

分 类 号：TQ028.8[化学工程]