COLD UTILIZATION SYSTEM, ENERGY SYSTEM COMPRISING COLD UTILIZATION SYSTEM, AND METHOD FOR UTILIZING COLD UTILIZATION SYSTEM

摘要

A cold energy power generation system increases the efficiency in utilizing the cold exergy of liquefied gas while freely controlling the gas supply pressure on the outlet side of a secondary expansion turbine. The system includes a pressure-increasing pump for increasing the pressure of a low-temperature liquefied gas to a pre-overboost pressure while maintaining the liquid gas in a liquid state, a Rankine-cycle-type primary power generation apparatus, a heater for heating a vaporized gas, and a direct-expansion-type secondary power generation apparatus. Since the cold exergy of the liquefied gas is more efficiently utilized as pressure exergy than as temperature exergy, the system converts the cold exergy more preferentially to pressure exergy, and the optimal operating conditions that maximize the conversion efficiency can be determined by the composition of the liquefied gas, the temperature of the heating source, and the gas supply pressure.