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为了分离燃煤电厂烟气中的二氧化碳,基于Matlab软件的Simulink组件对三级中空纤维膜装置进行模拟优化。建立了中空纤维膜的数学模型,使用Matlab软件编程;并针对经过预处理后CO_2体积分数15%,气量50 000 m~3/h的电厂烟气,在Simulink组件中模拟了分离工艺流程。膜材料采用经过氟化改性的聚酰亚胺6FDA/TAPA[六氟二酐/三(4-氨基苯基)胺)]。研究结果表明:随着膜面积和压力的增加,产品气中CO_2体积分数与CO_2回收率呈反比关系;所需的一、二、三级膜面积分别为42 000,50 000,5 200 m~2,需要的压缩机压力为一级0.7 MPa、二级0.65 MPa、三级1.5 Ma。最终得到的CO_2产品气流量为6 648.81 m~3/h,CO_2纯度86.88%,CO_2回收率77.02%,在满足分离要求的同时降低了碳排放。
In order to separate carbon dioxide in flue gas from coal-fired power plants, a Simulink module based on Matlab software was used to simulate and optimize the three-stage hollow fiber membrane device. A mathematic model of hollow fiber membrane was established and programmed with Matlab software. The separation process was simulated in Simulink module for power plant flue gas with volume fraction of 15% CO 2 and volume of 50 000 m 3 / h after pretreatment. The membrane material was fluorinated modified polyimide 6FDA / TAPA [hexafluoro dianhydride / tris (4-aminophenyl) amine)]. The results show that with the increase of membrane area and pressure, the volume fraction of CO 2 in the product gas is inversely proportional to the CO 2 recovery rate; the required membrane area of the primary, secondary and tertiary membranes are 42 000, 50 000, 2, the compressor pressure required for a 0.7 MPa, two 0.65 MPa, three 1.5 Ma. The final product CO 2 product gas flow of 6 648.81 m 3 / h, CO 2 purity of 86.88%, CO 2 recovery rate of 77.02%, to meet the separation requirements while reducing carbon emissions.