基于膜分离法的沼气脱CO2和H2S工艺研究  

Parameter Optimization of CO2 and H2S Removal from Biogas Based on Membrane Separation

作　　者：华东阳 李睿[1] 马梦桐 常明亮 HUA Dong-yang;LI Rui;MA Meng-tong;CHANG Ming-liang(College of Petroleum Engineering, Xi 'an Shiyou University, Xian 710065, China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065

出　　处：《中国沼气》2020年第4期34-38,共5页China Biogas

基　　金：国家自然科学基金项目(51274166);陕西省科技统筹创新工程(2016KTZDGY07-05);西安石油大学研究生创新与实践能力培养计划(YCS18213070)。

摘　　要：为同时脱除沼气中的CO2与H2S,文章开展沼气膜分离工艺研究。首先,分析气体膜分离原理,设定CH4回收率、CO2脱除率与H2S脱除率作为分离效果指标。其次,采用Unisim Design软件建立仿真模型,分析膜面积与操作压差变化对分离效果的影响规律,并提出一种二级膜分离工艺流程。最后,以CH4回收率、CO2脱除率与H2S脱除率之和最大作为目标函数,对二级膜分离工艺进行优化。结果表明:随着膜面积与操作压差的增大,CO2与H2S脱除率逐渐升高,但CH4回收率随之降低;一级膜分离工艺难以在脱除CO2与H2S的同时降低CH4损失;二级膜分离工艺经过优化后,CH4回收率达96.6%,CO2脱除率达99.5%,H2S脱除率为100%。In order to remove CO2 and H2S from biogas simultaneously,the membrane separation process was used in this study.Firstly the gas membrane separation principles were analyzed,and the CH4 recovery rate,CO2 removal rate and H2S removal rate were set as the separation performance indexes.Secondly the simulation model was established using Unisim Design software to analyze the influence of membrane area and operating pressure difference on the separation effect,and a secondary membrane separation process was proposed.Finally,the secondary membrane separation process was optimized by taking the maximum sum of CH4 recovery rate,CO2 removal rate and H2S removal rate as the objective function.The results showed that,as the membrane area and operating pressure difference increased,the removal rates of CO2 and H2S gradually increased,but the recovery rate of CH4 decreased.The first-stage membrane separation process was difficult to reduce CH4 loss while removing CO2 and H2S.After the optimization of the second-stage membrane separation process,the CH4 recovery rate reached 96.6%,the CO2 removal rate reached 99.5%,and the H2S removal rate was 100%.

关 键 词：沼气 膜分离 回收率 脱除率 工艺优化 

分 类 号：S216.4[农业科学—农业机械化工程]