摘要
为了研究利用乙醇胺(MEA)溶液从化石燃料燃烧电厂的尾气中分离CO2来减小温室气体的排放,采用ASPEN PLUS软件结合电厂参数建立了MEA溶液吸收CO2的流程.流程中的反应采用Eletrolyte-NRTL模型,吸收塔、解吸塔采用RADFRAC模型.通过模拟分析操作参数变化对CO2减排流程的影响,获得了最优操作点,同时对流程进行了改进,对压缩机级间热能回收进行了探讨.通过优化得到流程的最优操作点:MEA的质量分数为40%,CO2的回收率为99.2%,解吸塔操作压力为0.2 MPa,贫液负载量为0.131.回收压缩机级间热能及改进操作条件后,最优操作工况下CO2的解吸能耗为2.947 GJ/t,减排成本为344.0元/t,电厂效率由减排前的45%仅降为32.75%.
A process of CO2 capture was built based on an existing power plant by ASPEN PLUS for studying CO2 capture from flue gas of fossil fuel-fired power plant. Eletrolyte-NRTL model was used for the reaction of the process, and the absorber and stripper were built by RADFRAC model. The effect on CO2 removal by changing the operation parameters was analyzed, and the optimal operation condition was found. In addition, the performance was improved by recycling the interstage thermal energy of the compressors. The optimal operation condition was obtained when monoethanolamine（MEA） mass fraction was 40%, CO2 removal rate was 99.2%, operation pressure of stripper was 0.2 MPa, and lean solvent loading was 0. 131. The results show that by combining the optimal operation condition with recycling interstage energy, the thermal energy requirement of the process is 2. 947 GJ/t, the cost of CO2 removal is 344.0 RMB/t, and the efficiency of power plant decreases from 45 % to 32. 75 %.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2008年第11期1413-1417,共5页
Journal of Xi'an Jiaotong University
基金
陕西省科技攻关资助项目(2002K08-G9)
教育部教育振兴行动计划资助项目
关键词
乙醇胺
二氧化碳
减排
能耗
热能回收
monoethanolamine
CO2
removal
thermal energy requirement
recycling energy
作者简介
李青（1983-），男，硕士生；
张早校（联系人），男，教授，博士生导师．
