Simulation and Benefit Evaluation of SMR-LNG Combined Liquid Hydrogen Production System
A collaborative liquid hydrogen pro-duction process system based on LNG receiving station cold energy and steam methane reforming(SMR)hy-drogen production process,SMR-LNG combined liquid hydrogen production system,is proposed.The system utilizes a multi flow LNG heat exchanger to achieve coupling between steam methane reforming hydrogen production process and LNG pre cooled liquefied hy-drogen production process.The proposed process sys-tem is modeled and simulated by Aspen HYSYS soft-ware.When the LNG supply is 50 t/h,the system can produce liquid hydrogen with a mass flow rate of 5.89 t/h and a purity of 99.99％.The hydrogen liquefac-tion subsystem has lower specific energy consumption compared to traditional hydrogen purification and lique-faction processes,and the use of LNG cold energy has good energy-saving benefits.The exergy loss rate of all LNG heat exchangers in the system is 28.0％,the ex-ergy loss rate of all reactors is 26.4％,the exergy loss rate of all coolers is 13.3％,the exergy loss rate of all compressors is 8.2％,and the exergy loss rate of all expanders is 7.0％.The exergy loss rate of these 5 types of equipment is very high,which implies the op-portunity for energy saving improvement in the system.
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