Gas turbine-nitrogen Brayton cycle combined power generation system using cold energy of LNG (liquefied natural gas)

Abstract

The invention provides a gas turbine-nitrogen Brayton cycle combined power generation system using cold energy of LNG (liquefied natural gas). The power generation system comprises a gas turbine cycle, a nitrogen Brayton cycle, an LNG storage tank and a pressure regulation station, wherein the gas turbine cycle comprises an air-LNG heat exchanger, an air compressor, a combustor, a gas turbine and a first power generator; the nitrogen Brayton cycle comprises a nitrogen-LNG heat exchanger, a nitrogen compressor, a heat regenerator, a flue gas-nitrogen heat exchanger, a nitrogen turbine and a second power generator, wherein a flue gas outlet of the gas turbine in the gas turbine cycle is connected with a flue gas inlet of the flue gas-nitrogen heat exchanger in the nitrogen Brayton cycle. According to the power generation system, working media at inlets of the gas turbine and the nitrogen compressor are cooled through LNG, the cycle temperature ratio is increased, and the efficiency of the gas turbine-nitrogen Brayton cycle combined power generation system is improved effectively.

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 gas turbine-nitrogen Brayton cycle combined power generation system utilizing LNG cold energy. Background technique [0002] In recent years, many places in my country have encountered serious environmental problems such as smog, and the adjustment and transformation of energy structure is imminent. Compared with coal and oil, which currently account for the largest proportion in my country's energy structure, natural gas is a cleaner energy source, and it is also one of the key development targets of my country's energy strategic action plan. A large part of my country's natural gas needs to be imported. 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 buil...

AI Technical Summary

Problems solved by technology

[0006] For gas turbines, due to the high ambient temperature in summer, the air temperature at the inlet of the gas turbine increases, and the amount of air sucked in at a certain pressure ratio decreases, which reduces the output of the gas turbine and affects the economy of power generation.

At the same time, summer is usually the peak period of electricity consumption every year, and the decline in gas turbine output will also affect the overall power supply guarantee

Images