Abstract: The present invention disclosed an Organic Rankine Cycle (ORC) power generation system utilizing LNG cold energy and dual-fuel marine engine waste heat. The ORC power generation system has a Liquified Natural Gas (LNG) loop, one or more ORC loop, and one or more waste heat recovery (WHR) loop. The LNG loop works as a heat sink, which provides cold energy for working medium condensation. The WHR loop, utilizing the waste heat from main engine jacket cooling water and engine exhaust gas, provides heat for working medium evaporation. The ORC loop may have a pump, a three-fluid heat exchanger, an expander, a power generator, a regenerator, a liquid-vapor separator, a liquid reservoir, a regulating valve, and an evaporator. A regenerator is arranged within the ORC loop between the expander and the three-fluid heat exchanger. The ORC loop may have one or more evaporator, which may recover the waste heat from main engine jacket cooling water and engine exhaust gas.

Abstract: The present invention discloses an organic Rankine cycle (ORC) power generation system with a regenerator utilizing Liquefied Natural Gas (LNG) cold energy and industrial waste heat, the system comprising: an LNG regasification circuit, an ORC circuit, and an industrial waste heat circuit. The ORC circuit utilizes the cold energy released by the LNG regasification circuit and the heat energy dispersed by the industrial waste heat circuit. A bypass is set up in the ORC circuit to adjust the working medium flow rate via the expander to ensure efficient operation of the system. The invention improves the LNG cold energy recovery method based on the existing ORC cycle. The three-fluid heat exchanger and the regenerator could make full use of the cold energy provided by the LNG regasification process, reduce the thermal stress caused by the large temperature difference, alleviate the working load of the evaporator, and thus improve the heat to electricity conversion efficiency.