Facilitated transport membranes for biogas upgrading

doi:10.3969/j.issn.0438-1157.2014.05.006

Abstract

Abstract: Biomethane, purified from biogas, can be utilized as substitute for natural gas owing to its high calorific value (HCV). Typically biogas contains 60%—65% CH₄, 35%—40% CO₂, small amounts of hydrogen sulfide, water vapor and trace amounts of other gases. Treatment of raw biogas must be implemented in order to convert biogas into HCV biomethane. Membrane separation process exhibits many distinct advantages, including low energy consumption, high efficiency, high process flexibility and environment friendliness. Particularly, facilitated transport membrane exhibits predominant features for biogas upgrading because of its unique transport mechanism. Materials for facilitated transport membrane and corresponding preparation methods/technologies are summarized. Influences of impurities, such as water and hydrogen sulfide on membrane separation as well as some techno- economic issues are discussed. Finally, prospects on membrane separation technology in biogas upgrading are presented.

Key words: biomethane, bioenergy, membrane, separation, facilitated transport, water, hydrogen sulfide

摘要： 由生物气提纯获得的生物甲烷具有高热值，可作为天然气的替代品。生物气中除主要成分甲烷以外还含有大量的CO₂和少量的水、H₂S以及其他痕量杂质组分，需经过净化提纯方可获得高纯度的生物甲烷。膜分离技术用于生物气提纯具有绿色、高效、能耗低等特点，特别地，促进传递膜因其特殊的传质机制，对于生物甲烷系统提纯具有显著优势。综述了促进传递膜材料及其制备技术，讨论了生物气中水、H₂S杂质对膜过程的影响，同时尝试对膜法生物气提纯的经济性和发展前景进行了分析。

关键词: 生物甲烷, 生物能源, 膜, 分离, 促进传递, 水, 硫化氢

CLC Number:

TQ028.8

TIAN Zhizhang, LI Yifan, JIANG Zhongyi, WANG Shaofei. Facilitated transport membranes for biogas upgrading[J]. CIESC Journal, DOI: 10.3969/j.issn.0438-1157.2014.05.006.

田志章, 李奕帆, 姜忠义, 王少飞. 用于生物气提纯的促进传递膜[J]. 化工学报, DOI: 10.3969/j.issn.0438-1157.2014.05.006.

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