超临界二氧化碳和水膜分离器的数值模拟  

Numerical simulation of supercritical carbon dioxide and water membrane separator

作　　者：潘越 乔宗良[1] 汤有飞 曹越 司风琪[1] PAN Yue;QIAO Zongliang;TANG Youfei;CAO Yue;SI Fengqi(Key Laboratory of Energy Thermal Conversion and Process Measurement and Control of Ministry of Education,Southeast University,Nanjing 210096,China)

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：《热力发电》2022年第10期170-176,共7页Thermal Power Generation

摘　　要：为了解决CO_(2)羽流地热发电系统中超临界二氧化碳分离开采过程中携带水的问题,采用数值模拟方法分析了三维管壳式中空纤维膜的吸收分离特性,建立了耦合物质运输模型、多孔介质模型和吸收的数学模型,研究分离器不同设计参数对分离效率的影响。结果发现:当混合物入口速度由0.01 m/s增加到0.20 m/s时,膜的分离效率由95.76%下降到56.91%;当增加膜管长度时,分离效率不断升高,而增加膜管半径时,分离效率不断降低;当混合物入口速度大于0.05 m/s时,逆流布置的分离效率逐渐高于顺流布置的分离效率;增加膜分离器内膜管数量时,分离效率逐渐降低,单根膜管的分离效率最高。In order to solve the problem of water carried during the separation and mining of supercritical carbon dioxide in CO_(2) plume geothermal power generation system,the absorption and separation characteristics of the three-dimensional tube-shell hollow fiber membrane were analyzed by numerical simulation method,and the coupled substance transport model,porous medium model and absorption mathematical model were established,and the influence of different design parameters of the separator on the separation efficiency was studied.The simulation results show that,when the inlet velocity of the mixture increases from 0.01 m/s to 0.20 m/s,the separation efficiency decreases from 95.76%to 56.91%.The separation efficiency increases with the tube length,but decreases when increasing the tube radius.It is found that when the inlet velocity of the mixture is greater than 0.05 m/s,the separation efficiency of the countercurrent arrangement is gradually higher than that of the downstream arrangement.When increasing the number of membrane tubes in the membrane separator,the separation efficiency relatively gradually reduces,and that of the single membrane tube is the highest.

关 键 词：超临界二氧化碳 膜吸收分离 中空纤维膜 数值模拟 分离效率 

分 类 号：TK529[动力工程及工程热物理—热能工程]