Thermodynamic analysis of LNG cold energy coupled liquid air energy storage system with air diversion
An LNG-LAES system(LNG cold energy coupled with Liquid Air Energy Storage system)with air diversion was proposed in this paper,which utilizes diverted air for depressurization refrigeration to supplement high-grade cold energy in the cold box.Sensitivity analysis was conducted on the air diversion flow rate.The results show that as the temperature of LNG in-creases,the air diversion flow rate needs to decrease.The round-trip efficiency of the system shows a decreasing trend with the increase of air diversion flow rate.For the 10 MW energy release target,under the conditions of LNG temperature of-145 ℃,LNG consumption of 15.4 t/h,and air diversion ratio of 30.8％,the system performance is optimal.At this time,the liquefac-tion rate of the system is 89.2％,the round-trip efficiency is about 70％,and the system exergy efficiency is 66.05％.
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