燃煤烟气中共存杂质对膜分离CO<sub>2</sub>性能影响的实验研究

王霞; 陈浩; 瞿如敏; 张琳; 杨林军

燃煤烟气中共存杂质对膜分离CO₂性能影响的实验研究

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

基金项目: 国家自然科学基金(51176034).

详细信息

通讯作者:
杨林军,E-mail:ylj@seu.edu.cn.

中图分类号: TQ028.8
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- 被引次数: 0
出版历程
- 收稿日期: 2014-08-21
- 修回日期: 2014-09-24
- 刊出日期: 2015-01-30

Effects of the coexistent impurities in the flue gas on CO₂ separation by membranes

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

摘要

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%.
- CO₂分离 /
- PDMS-PSF复合膜 /
- 共存气态组分 /
- 颗粒物 /
- 影响
Abstract: The effects of coexistent gaseous components and fine particles on the CO₂ separation performance by polydimethylsiloxane/polysulfon (PDMS-PSF) flat sheet composite membranes were investigated in a simulated test-bed. It can be found that O₂ slightly inhibits the CO₂ separation performance, while 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 PDMS-PSF composite membranes. The fly ash fine particles significantly deteriorate the CO₂ separation performance of PDMS-PSF membranes. Moreover, the CO₂ separation experiments by PDMS-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, which gradually deteriorates the CO₂ separation performance of PDMS-PSF membrane. The CO₂/N₂ selectivity and the CO₂ permeation rate are decreased by 17.91% and 28.21%, respectively.
- CO₂ separation /
- PDMS-PSF composite membranes /
- coexistent gaseous components /
- fine particles /
- effects

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