LNG (Liquefied Natural Gas) cold energy efficient mixed refrigerant power generation method

Abstract

The invention discloses a high-efficiency power generation technology capable of fully utilizing LNG (Liquefied Natural Gas) cold energy. A high-pressure mixed refrigerant is heated and gasified by seawater and then flows into a turbine inlet buffer separation tank, a high-pressure gas-phase mixed refrigerant drives a turbo expander to generate power and then depressurizes, a low-pressure gas-phase mixed refrigerant flows into a mixed refrigerant condensing heat exchanger with LNG as a cold source and enters a refrigerant pump inlet buffer separation tank after being condensed, and a liquid mixed refrigerant is pressurized by a refrigerant pump and then enters the turbine inlet buffer separation tank. And the mixed refrigerant flows back into the mixed refrigerant condensing heat exchanger as a cold source, is gasified into a high-pressure mixed refrigerant two-phase flow at an outlet of the heat exchanger and then enters a separation tank for gas-liquid separation, and a gas-phase refrigerant and a liquid-phase refrigerant respectively enter a coiled tube type refrigerant evaporator with seawater as a heat source or an ORV type evaporator for gasification and rewarming.

Description

Technical field: [0001] It belongs to the technical field of power generation. Utilize the cold energy in the LNG gasification process in the LNG receiving station or satellite station to establish a high-efficiency low-temperature Rankine power cycle power generation system method with hydrocarbon mixed refrigerant as the medium. Background technique [0002] Dozens of LNG receiving stations are built along the coast of China to receive imported LNG. The temperature of LNG under normal pressure is -162°C. my country imports tens of millions of tons of LNG each year, which carries huge cold energy. Seawater is usually used to directly heat the receiving stations. The LNG method gasifies LNG and then transports it outside, which wastes a lot of cold energy and affects the ecological environment of the surrounding sea areas. There are many ways to utilize LNG cold energy, such as air separation, ice making, power generation, cold storage, crushed rubber, and data centers, etc....

AI Technical Summary

Problems solved by technology

The process of this method is composed of multiple cycles, the system is complex, and the system has poor adjustment performance under variable working conditions.

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