Research on multistage throttling mechanisms in natural gas liquefaction process using a mixed refrigerant cascade system
Based on the cascade mixture refrigeration liquefaction process of natural gas,a new liquefaction process with four-stage throttling in precooling section and two-stage throttling in liquefaction section was proposed.Using the genetic algo-rithm interface toolbox of Aspen HYSYS and Matlab,the modified non-dominated sequencing genetic algorithm was adopted to globally optimize the operating parameters of the proposed new process,aiming at the minimum specific power consumption of the system.After optimization,the minimum specific power consumption of the system is reduced to 5.09 kWh/kmol LNG,which is 5.9％lower than before optimization.
Mixed fluid cascadeThrottling stagesSpecific power consumption
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