Helium gas tight type Bretton cycle power generation system utilizing LNG cold energy in two-stage mode

Abstract

The invention provides a helium gas tight type Bretton cycle power generation system utilizing LNG cold energy in a two-stage mode. The power generation system at least comprises a first-stage cycle, a second-stage cycle, an LNG storage tank, a pressure regulating station, a combustion chamber and an air pre-heater, wherein a first helium gas-LNG heat exchanger sequentially passes through a first helium gas compressor, a first heat regenerator, a first flue-gas-helium gas heat exchanger, a first helium gas turbine, a first heat regenerator and a first heat supply boiler to form the first-stage cycle; a first power generator is connected with the first helium gas turbine; a second helium gas-LNG heat exchanger sequentially passes through a second helium gas compressor, a second heat regenerator, a second flue gas-helium gas heat exchanger, a second helium gas turbine and a second heat regenerator to form the second-stage cycle; and the second power generator is connected with the second helium gas turbine. The power generation system provided by the invention is a safe, stable and efficient helium gas tight type Bretton cycle power generation system utilizing LNG cold energy in the two-stage mode; a LNG is utilized for cooling a working medium in an inlet of each helium gas compressor to a low-temperature state, so that a circulating temperature ratio of a Bretton cycle is increased, and efficiency of the helium gas tight type Bretton cycle power generation system is effectively improved.

Description

technical field [0001] The invention relates to the application of LNG cold energy in the technical field of power generation, in particular to a two-stage helium closed Brayton cycle power generation system utilizing LNG cold energy. Background technique [0002] As environmental problems such as smog have become increasingly serious in recent years, it has become an urgent need to adjust and optimize the energy structure. As a relatively clean energy source compared with coal and oil, natural gas is the key development object in my country's energy development strategic action plan, and has received strong support from the state. In order to facilitate storage and long-distance transportation, natural gas is usually cryogenically cooled to a liquid state, which is LNG (liquefied natural gas). At present, more than 20 LNG receiving stations have been built or are under construction in my country's coastal areas, and the annual import volume is close to 20 million tons. Th...

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Problems solved by technology

However, due to the limitation of the dew point of water vapor in the air, the inlet air can only be cooled to about 5°C at a minimum, the efficiency improvement is limited, and the heat exchanger is cold Big loss

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