Optimization and process analysis of hydrogen liquefaction process for precooling of mixed working medium
The hydrogen liquefaction process of mixed refrigerant precooling and hydrogen expansion cryogenic cooling was studied,and the influence of related process parameters such as mixed refrigerant ratio and isentropic efficiency of hydrogen ex-pansion on system power consumption was analyzed,and process parameters of the process were optimized.The steady-state simulation of hydrogen liquefaction process was carried out by Aspen Hysys.The parameters of the precooling section were opti-mized by using the improved orthogonal experiment optimization method,and the mixing medium ratio under the lowest specific power consumption of the precooling circulation system was obtained by Matlab regression analysis method:methane 10.2％,ethane 29.3％,propane 39.3％,nitrogen 21.2％.At the same time,The specific power consumption of cryogenic cycle system is reduced by 7.8％compared with the initial parameters.
Mixed working mediumHydrogen liquefaction processSteady state simulationOrthogonal experimentParame-ter optimization
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