净化瓦斯气中氢气和轻烃回收工艺模拟与优化  

Simulation and optimization of process for recovering hydrogen and light hydrocarbon in purified methane gas

作　　者：杨晓航 郭明钢 代岩 郗元 YANG Xiao-hang;GUO Ming-gang;DAI Yan;XI Yuan(Panjin Haoye Chemical Co.,Ltd.,Panjin 124123,China;Liaoning Key Laboratory of Chemical Additive Synthesis and Separation,Panjin Industrial Technology Institute,Dalian University of Technology,Panjin 124221,China)

机构地区：[1]盘锦浩业化工有限公司,辽宁盘锦124123 [2]大连理工大学盘锦产业技术研究院,辽宁省化学助剂合成与分离省市共建重点实验室,辽宁盘锦124221

出　　处：《现代化工》2021年第2期235-240,共6页Modern Chemical Industry

基　　金：国家自然科学基金青年基金项目(21706023);辽宁省化学助剂合成与分离省重点实验室开放课题基金资助项目(ZJKF2013)。

摘　　要：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 k Pa,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 k W,25. 09 million standard cubic meters of hydrogen can be recovered in one year,10147 tons of light hydrocarbon can be recovered a year,total recovery value reaches RMB 39. 54 million per year,RMB34. 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.

关 键 词：瓦斯气 氢气 轻烃 膜分离 耦合 模拟优化 

分 类 号：TQ028.8[化学工程]