CO_2/H_2膜分离工艺参数模拟研究

Parametric modeling study of CO_2/H_2 membrane gas separation process

介绍了变换气中CO2脱除的方法,认为气体膜分离技术是未来传统脱碳工艺的潜在替代技术。通过采用PROII模拟软件进行模拟,详细描述了变换气脱碳一级膜过程的质量平衡。研究了气源条件如进气CO2摩尔分数、压力,膜材料性质如渗透性、选择性,以及膜面积等因素对膜分离性能如净化气中CO2摩尔分数和H2回收率的影响。结果表明:膜材料本身的性能如渗透性、选择性、膜面积对脱除CO2具有决定性的影响;操作条件中,压比的增大有助于气体净化,然而造成H2回收率下降和额外的能量消耗,适宜的渗透气压力为101 kPa,压比大于10;进气CO2摩尔分数增大不利于CO2的脱除,却可以提高H2的回收率。

The technologies for removing CO： from shift gas are presented, and membrane gas separation technique is considered as the substitute for traditional technologies. Through the simulation by PROII software, the mass balances in a simulated single stage membrane process are described in detail. The effects of source gas conditions such as molar fraction of COz and pressure, membrane properties such as permeability, selectivity and membrane area on the membrane separating performance of molar fraction of CO2 in pu- rified gas and recovery of H2 are studied. The results show that the membrane properties have crucial effects on removing CO2. Increasing pressure ratio is conducive to decrease molar fraction of CO2, but lead to decrease recovery of H2 and increase the energy consumption. The optimum pressure of permeating gas is 101 kPa, pressure ratio is more than 10. Increasing the molar fraction of CO2 in feed gas is bad for removing CO2, but can increase the recovery of H2.