Design and optimization of BOG recovery and helium extraction combined production process at LNG receiving station
In order to solve the problems of low recovery rate and high energy consumption in the current BOG recovery process and BOG helium extraction process,a cogeneration process was proposed,which combined the LNG receiving station BOG recovery process with the BOG helium extraction process.Single process and combined production process were simulated using HYSYS to analyze the key parameters that affect the comprehensive energy consumption and crude helium concentration of the process.Maintaining a crude helium concentration of 92.61％,with the ob-jective of minimizing comprehensive energy consumption,the key parameters were optimized using response surface methodology and genetic algorithm.The optimal parameters were obtained,BOG compressor outlet pressure of 600 kPa,low-pressure pump outlet pressure of 700 kPa,seawater pump outlet pressure of 4 000 kPa,feed temperature of-150 ℃ in the cryogenic tower,and feed pressure of 1 000 kPa in the cryogenic tower.Compared with the single process,this cogeneration process had significant energy-saving advantages,reducing comprehensive energy consumption by 16.17％,achieving a BOG recovery rate of 84.21％,and a crude helium recovery rate and con-centration of 95.83％and 92.61％,respectively.The results indicates that this cogeneration process has significant advantages in energy consumption and investment costs.
LNG receiving stationBOG recyclingBOG helium extractionco production processHYSYSparameter optimizationenergy consumption
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