COLD UTILIZATION SYSTEM ENERGY SYSTEM PROVIDED WITH COLD UTILIZATION SYSTEM AND METHOD FOR UTILIZING COLD UTILIZATION SYSTEM

摘要

The present invention is a supercritical pressure power generation (LSG) of a cryogenic fluid, which provides a cold heat utilization system capable of freely controlling the gas delivery pressure on the outlet side of the secondary expansion turbine and increasing the utilization efficiency of the cooling and heating exergy of the liquefied gas. The LSG includes a booster pump for boosting the low-temperature liquefied gas to a predetermined pressure or higher than the critical pressure, a Rankine cycle type primary power generation device, and a direct expansion type secondary power generation device. In order to effectively utilize the cooling / heating of the liquefied gas, it is effective to use the cooling / heating exergy as a pressure exergy rather than the temperature exergy. The LSG transforms the cooling and cooling exergy to a pressure exergy, and it is possible to determine the optimum operating condition that gives the highest conversion efficiency by the liquefied gas composition, the heating source temperature and the gas delivery pressure. For example, in the case of the maximum power generation case where the gas delivery pressure is low, the generator unit is about 486 [kJ / kg] (135 [kWh / ton]) as a practical value for correction and about 54% .