采用膜分离与吸收耦合的工艺技术回收氢气和轻烃，从而提高资源利用效率。采用Aspen HYSYS对耦合工艺模拟优化得出：氮气切割比为0.95，进膜分离单元压力1 900 kPa，氢气回收率91.56%，轻烃回收率89.48%，回收的氢气摩尔分数为95.93%，燃料气中C₃摩尔分数1.72%。以某炼厂净化瓦斯气为例进行经济性分析，最优膜面积为1 964 m²，压缩机功率为1 069 kW，1年可以回收2 509万m³氢气、10 147 t轻烃，回收价值为3 954万元/a，固定投资为3 441万元/a，运行费用为683万元/a，经济效益为2 976万元/a，投资回报期为13.9个月。若炼厂燃料气管网需补充天然气，则采购天然气成本要不大于1 256万元/a时耦合工艺才具有良好的经济性。

A process that couples membrane separation with absorption is used to recover hydrogen and light hydrocarbon in methane gas in order to improve resource utilization efficiency.Aspen HYSYS software is employed to simulate and optimize the coupling process.Results show that the nitrogen cutting ratio is 0.95,the pressure of membrane separation unit is 1 900 kPa,the recovery rates of hydrogen and light hydrocarbon reach 91.56% and 89.48% respectively,the molar fraction of hydrogen recovered is 95.93%,and that of C₃ in fuel gas is 1.72%.Taking a refinery in northeastern region of China as an example,the economic analysis is carried out.The optimal membrane area is 1 964 m²,the compressor power is 1 069 kW,25.09 million standard cubic meters of hydrogen can be recovered in one year,10 147 tons of light hydrocarbon can be recovered a year,total recovery value reaches RMB 39.54 million per year,RMB 34.41 million of fixed investment is needed a year,the operation cost is RMB 6.83 million per year,the economic benefit can reach RMB 29.76 million per year,and the investment return period is 13.9 months.If the fuel gas pipeline network in refinery needs to supplement natural gas,the purchase cost of natural gas should not exceed RMB 12.56 million per year so as to remain a good economy for the coupling process.

杨晓航(1986-),男,硕士,工程师,研究方向为化工过程强化,yang1987hang@163.com