真空变压吸附提浓煤矿乏风瓦斯的抽真空排放过程-ingentaconnect.pdf

　 第38卷第2期 煤　 　 炭　 　 学　 　 报 Vol.38　 No.2　 　 2013年 2月 JOURNAL OF CHINA COAL SOCIETY Feb.　 2013　 - - - 　 　 文章编号:0253 9993(2013)02 0251 06 真空变压吸附提浓煤矿乏风瓦斯的抽真空排放过程 张传钊,刘应书,李永玲,杨　 雄,孟　 宇 (北京科技大学 机械工程学院,北京　 100083) 摘　 要:研究了活性炭的平衡吸附性能,计算出该种活性炭对甲烷和氮气的混合气体的分离因子为 5．20,并采用以该种活性炭为吸附剂的三塔真空变压吸附装置,研究了循环流程中的抽排步骤对吸 附分离效果的影响,并分析了影响抽排过程的因素。 结果表明:引入抽排步骤可以在不改变吸附与 解吸压力的情况下有效提高产品气中甲烷浓度。 而甲烷浓度会随抽排比的增加而增加,但存在一 个极限值,达到极限值之后趋于稳定。 与此同时,回收率随抽排比的增加而不断下降。 并且均压过 程与吸附压力会影响抽排过程。 与抽排气排空流程相比,采用抽排气回流流程可以有效地提高产 品气甲烷回收率,但并不一定提高产品气甲烷浓度,存在一个临界抽排比,小于此值时,采用抽排气 回流流程反而会降低产品气甲烷浓度。 在吸附与解吸压力分别为140 kPa 与14 kPa 时,采用该流 程可将0．2%的原料气提升至0．680%。 关键词:真空变压吸附(VPSA);煤矿乏风瓦斯(VAM);活性炭;提浓 中图分类号:TQ028．1;TD712　 　 　 文献标志码:A Vacuum exhaust process in vacuum pressure-swing adsorption for upgrading ventilation air methane ZHANG Chuan-zhao,LIU Ying-shu,LI Yong-ling,YANG Xiong,MENG Yu (School of Mechanical Engineering,University of Science and Technology Beijing,Beijing　 100083,China) Abstract:The equilibrium adsorption characteristics of activated carbon were tested and researched.Equilibrium se- lectivity of the activated carbon was 5.20.Vacuum exhaust process in three-bed vacuum pressure swing adsorption (VPSA)for concentrating ventilation air methane(VAM) was studied experimentally.The effect of vacuum exhaust ratio on methane concentration and recovery were investigated.The factors which effect on vacuum exhaust process were analyzed.Theresultsshow that vacuum exhaust step can increasethe methane concentration of product gaswith- out increasing pressure.As the ratio increases,the concentrations of methane in both product and effluent first in- crease,and then re