离子液体–乙醇胺水溶液脱碳流程的模拟与分析  

Simulation and Analysis on Decarbonization Process of Ionic Liquid-MEA Aqueous Solution

作　　者：李京 湛志钢 丁常富[1] 薛清元 李德波 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定0710031 [2]广东电网有限责任公司电力科学研究院,广东广州510080 [3]广东电科院能源技术有限责任公司,广东广州510080

出　　处：《广东电力》2017年第9期1-8,共8页Guangdong Electric Power

基　　金：中国南方电网有限责任公司科技项目(GDKJ00000001)

摘　　要：为了研究与优化离子液体–乙醇胺(MEA)水溶液的脱碳过程,降低脱碳能耗,在Aspen Plus8.8中使用平衡级模型对1-丁基-3-甲基咪唑四氟硼酸盐与MEA混合水溶液([Bmim][BF_4]-MEA-H_2O)、N-丁基吡啶四氟硼酸盐与MEA混合水溶液([Bpy][BF_4]-MEA-H_2O)脱碳流程进行了模拟和校核。以M EA、H_2O质量分数分别为30%、70%的溶液脱碳过程为对比项,分析优化了一定配比[Bmim][BF_4]-MEA-H_2O、[Bpy][BF_4]-MEA-H_2O溶液的脱碳工艺,在设定条件下得到结果:当[Bmim][BF_4]及[Bpy][BF_4]脱碳溶液与烟气质量流量之比为2.3和1.8,吸收塔塔板数为12和11时,CO2脱除率即可达到90%以上;对再生塔进行改进后,再生塔塔板数为11和9时,解吸率即可达到97.5%以上;且在该流程下,MEA、[Bmim][BF_4]、H_2O质量分数分别为30%、30%、40%的溶液及M EA、[Bpy][BF_4]、H_2O质量分数分别为30%、40%、30%的溶液在各自离子液体混合溶液中再生能耗最低,相对于常规MEA脱碳流程,附加耗功增大了约0.13 GJ/t,但再沸器能耗分别降低0.7GJ/t、1.01 GJ/t,综合而言实现了节能减排。In order to study decarbonization process of ionic liquid-MEA aqueous solution and reduce decarbonization energy consumption,the equilibrium model was used in Aspen Plus 8. 8 to simulate and check decarbonization processes of [Bmim][BF_4]-MEA-H_2O solution and [Bpy][BF_4]-MEA-H_2O solution. Decarbonization processes of Solution with respective mass concentration of 30% MEA and 70% H_2O was taken as a comparative item for optimizing the decarbonization techniques of [Bmim][BF_4]-MEA-H_2O solution and [Bpy][BF_4]-MEA-H_2O solution. Results under setting conditions indicate that when mass flowratios are2. 3 and 1. 8 respectively between [Bmim][BF_4]decarbonization solution and flue gas as well as between [Bpy][BF_4]decarbonization solution and flue gas,meanwhile,as absorption tower numbers are 12 and 11,CO2 removal rate reaches over 90%. After improving the regeneration tower and as numbers of regeneration tower are 11 and 9,desorption rate reaches over 97. 5%. And under this process,regeneration energy consumption of the solution with respective mass concentration of 30% MEA,30% [Bmim][BF_4]and 40% H_2O and the solution with respective mass concentration of 30% MEA,40% [Bpy][BF_4]and 30% H_2O in each ionic liquid. Relative to conventional MEA decarbonizatoin flow,additional waste work has increased about 0. 13 GJ/t while energy consumption of the reboiler has reduced 0. 7 GJ/t and 1. 01 GJ/t. In general,the optimized techniques have realized energy saving and consumption reduction.

关 键 词：离子液体 乙醇胺 C02捕集 AspenPlus模拟 

分 类 号：X701[环境科学与工程—环境工程]