混合工质预冷氢液化流程设计与能效分析

Process design and performance evaluation of a novel hydrogen liquefaction process with mixed refrigerant pre-cooling

提出了一种由混合工质预冷的改进型氢Claude液化循环。通过化工流程模拟软件对该液化循环进行稳态模拟,并对液化系统进行了分析。300 K、0.15 MPa的氢气经压缩机压缩至2.1 MPa,由混合工质预冷循环逐级冷却至118 K,并进一步由氢克劳德循环逐级冷却并液化,得到仲氢含量为98.5%的液氢产品。该流程的液氢产率为7.25 t/d,总比能耗为6.565 kWh/kg LH_(2),系统总的效率为48.99%。

A improved hydrogen Claude liquefaction precooled by mixed refrigerant cycle is proposed in the present work.The chemical process simulation software is used to conduct steadystate simulation of the liquefaction cycle.Energy analysis and exergy analysis of the liquefaction system are carried out.The feed normal hydrogen gas(300 K,0.15 MPa)is first pressurized,then cooled to 118 K through a mixed refrigerant pre-cooling cycle,and further cooled and liquefied into the product liquid hydrogen with a para-hydrogen of 98.5%via the improved Claude cycle.The liquid hydrogen yield of the proposed hydrogen liquefaction process is 7.25 t/d,and the specific energy consumption of the hydrogen gas compression and pre-cooling processes is 3.538 kWh/kg LH_(2),while the total specific energy consumption of the whole liquefaction system is 6.565 kWh/kg LH_(2).Exergy analyses show that the exergy efficiencies of the pre-cooling refrigeration cycle,the Claude cycle and the whole liquefaction process are 20.20%,64.39%and 48.99%,respectively.