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摘 要： 在以焦炉煤气或者煤制甲烷等含氢甲烷为原料生产液化天然气时，氢气含量会对液化流程产生较大影响。本文以氮气膨胀液化流程为考察对象，模拟了各种含氢量的含氢甲烷的液化流程。以单位功耗为第一优化目标进行流程优化，发现在回收率一定时，单位功耗随着含氢量的增加而增加；当含氢量一定时，随着回收率的提升，单位功耗显著增加。研究结果表明，仅采用液化而不采用精馏分离，可以从含氢天然气生产出高质量的LNG产品，流程的单位能耗和产品纯度均在可接受的范围。 关键字 ：含氢甲烷 液化天然气（LNG） 氮膨胀液化流程 能耗 Effects of hydrogen content on nitrogen expansion liquefaction process of methane mixture containing hydrogen Zhang Lin, Gao Ting, Lin Wensheng, Gu Anzhong （Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai 200240, China） Abstract: When producing liquefied natural gas (LNG) with hydrogen-containing methane mixture (such as coke oven gas, coal based synthetic natural gas, etc.), the hydrogen content of the feed gas has a major impact on the liquefaction process. Based on nitrogen expansion liquefaction process, this paper simulates a series of liquefaction processes of methane mixtures containing different amounts of hydrogen. After optimizing these processes by minimizing the unit power consumption, it turns out that unit power consumption increases with the increase of hydrogen content and methane recovery rate when methane recovery rate and hydrogen content are fixed respectively. The results show that the unit power consumption and the product purity of the process without distillation are acceptable, so it is feasible to produce high quality LNG from hydrogen-containing methane mixture only with liquefaction. Keywords: hydrogen-containing methane mixture, liquefied natural gas (LNG), nitrogen expansion liquefaction process, unit power consumption