Aiming at the problem of cold energy recycling

a cold energy utilization system combined with LNG and coal-burning waste gas power generation and natural gas re-liquefaction was proposed and the system was improved. The thermodynamic calculation of the original system and part of the improved system was made. The effects of evaporation pressure and temperature on the thermal performance of the system was analyzed in detail

the influences of natural gas liquefaction rate on the net power output of the system was analyzed. The optimal scope of power cycle optimal evaporating pressure

evaporation temperature and gas liquefaction rate was determined. The results showed that:calculating as the LNG cold energy recovery is 1000 kg·h-1

the maximum net output of power generation system was 69.6 kW·h

cold energy recovery efficiency was 41.43%; the maximum value of liquefaction system LNG liquefaction rate was 24%; as the system was improved

the net output power and cold energy recovery efficiency of the power generation system increased by 17.85%

the liquefaction rate of LNG liquefaction system was improved to 28%. It provides a new way of thinking for the cold energy utilization in the process of LNG gasification.