单乙醇胺(MEA)蒸汽再压缩-分流解吸脱碳工艺的模拟与优化
首发时间:2014-11-04
摘要:针对目前CO2捕获技术能耗较高的问题,利用ProMax3.2化工流程模拟软件,建立单乙醇胺(MEA)溶液吸收300MW燃煤电厂烟道气中二氧化碳(CO2)捕集系统的过程模型。对塔顶蒸汽再压缩-分流解吸流程进行模拟研究,在保证CO2 捕获率90%的前提下,采用TSWEET动力学模型,对富液流股Rich2摩尔分率、富液流股Rich2进料位置及压缩机出口压力进行灵敏度分析,获取了最优的工艺条件。新流程配置当量功最低为0.39GJ/t CO2,其中再沸器负荷为1.98 GJ/t CO2,压缩功为0.06 GJ/t CO2,与传统工艺流程相比,系统总能耗降低30.36%。
关键词: 二氧化碳捕集 单乙醇胺(MEA) 蒸汽再压缩 当量功
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Simulation and optimization of absorption split stripping with vapor recompression process for CO2 capture using monoethanolamine
Abstract:A process model of Carbon dioxide (CO2) capture from a 300 MW power plant flue gas using 30 wt% aqueous monoethanolamine (MEA) was established and simulated to overcome the drawback of relatively high energy consumption of traditional technology. The model was performed on ProMax3.2. A rigorous model built on SWEET kinetics of ProMax was used to simulate the exothermic, reversible chemical reactions in MEA-CO2 system in the absorption/regeneration process. In addition, sensitivity analyses were performed to evaluate the effects of key parameters (e.g. Rich2 feed fraction, Rich2 feed location and compressor outlet pressure) of the absorption split stripping with vapor recompression process at the given 90% CO2 removal efficiency. In this work, the minimal total equivalent works of absorption split stripping with vapor recompression process was 0.39 GJ/t CO2, the reboiler duty and compression work were 1.98 and 0.06 GJ/t CO2, respectively. The simulation results showed that the novel process configuration resulted in great improvement with a reduction of total equivalent work by 30.36% compared to the baseline process.
Keywords: Carbon dioxide capture Monoethanolamine vapor recompression total equivalent work
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