CN-114961999-B - Supercritical carbon dioxide power generation circulation system for cold air precooling

CN114961999BCN 114961999 BCN114961999 BCN 114961999BCN-114961999-B

Abstract

The invention discloses a supercritical carbon dioxide power generation circulation system for cold air precooling, which is connected with an aeroengine air cooling system, wherein the aeroengine air cooling system comprises a gas compressor, a turbine shaft and a high-temperature turbine device, the gas compressor is connected with the high-temperature turbine device through the turbine shaft, the high-temperature turbine device drives the gas compressor through the turbine shaft to form high-pressure gas A, the supercritical carbon dioxide power generation circulation system comprises a compressor, a generator, a turbine device, a regenerator and a cooler which are sequentially connected, a spherical concave spiral heat exchanger is connected between the turbine device and the regenerator, the concave spiral heat exchanger is arranged in the turbine shaft, and supercritical carbon dioxide is arranged in the spherical concave spiral heat exchanger. The invention has small volume and light weight, solves the problem of heat protection of the aero-engine, and effectively improves the overall heat efficiency of the aero-engine.

Inventors

XIA JUN
ZHANG BOLUN
HU QIGAO
SHEN ZHIQIANG
XI YUNZHI

Assignees

中国人民解放军国防科技大学
中国人民解放军国防科技大学

Dates

Publication Date: 20260421
Application Date: 20220607
Priority Date: 20220607

Claims (1)

1. The supercritical carbon dioxide power generation circulation system for cold air precooling is characterized by being connected with an aeroengine air cooling system, the aeroengine air cooling system comprises a compressor, a turbine shaft and a high-temperature turbine device, the compressor is connected with the high-temperature turbine device through the turbine shaft, the high-temperature turbine device drives the compressor through the turbine shaft to form high-pressure air A, the supercritical carbon dioxide power generation circulation system comprises a compressor, a generator, a turbine device, a regenerator and a cooler which are sequentially connected, a spherical concave spiral heat exchanger is connected between the turbine device and the regenerator, the spherical concave spiral heat exchanger is arranged in the turbine shaft, and supercritical carbon dioxide is arranged in the spherical concave spiral heat exchanger; a plurality of spherical depressions are equidistantly arranged on the spiral heat exchanger with the spherical depressions; Three spherical depressions are arranged on the same cross section of the spiral heat exchanger with the spherical depressions, the spherical depressions are not arranged on the windward side of the spiral heat exchanger with the spherical depressions, the diameter of the spherical depressions is smaller than 0.4D, and D is the diameter of a spiral tube in the spiral heat exchanger with the spherical depressions; the compressor, the generator and the turbine device are coaxially connected; the inlet side of the spiral heat exchanger with the spherical concave is upstream of the high-pressure gas A in the turbine shaft, and heat of the high-pressure gas A in the turbine shaft is conducted to supercritical carbon dioxide in the spiral heat exchanger with the spherical concave; The inlet of the compressor is connected with the outlet of the cooler, the outlet of the turbine device is connected with the hot side inlet of the heat regenerator, the outlet of the compressor is connected with the cold side inlet of the heat regenerator, the hot side outlet of the heat regenerator is connected with the inlet of the cooler, the cold side outlet of the heat regenerator is connected with the inlet of the spiral heat exchanger with the spherical concave, and the outlet of the spiral heat exchanger with the spherical concave is connected with the inlet of the turbine device.

Description

Supercritical carbon dioxide power generation circulation system for cold air precooling Technical Field The invention relates to the technical field of power generation, in particular to a supercritical carbon dioxide power generation circulating system for cold air precooling. Background According to the thermodynamic mechanism of the gas turbine engine, the heat efficiency and output power of the engine can be effectively improved by increasing the temperature of the gas at the front inlet of the turbine, the temperature of the gas at the front inlet of the turbine is increased by 56 degrees, the heat efficiency of the engine can be increased by 2% -4%, and the thrust is increased by 8% -13%. This results in a year-by-year rise in the temperature of the gas at the front inlet of the turbine of an aircraft engine, which is now much higher than the temperature resistant range of the material. If the hot end components downstream of the combustion chamber do not take necessary cooling measures, they are necessarily damaged by the corrosion of the fuel gas, severely affecting the normal operation of the aeroengine. Therefore, the application of efficient cooling technology is necessary on the hot end component, so that the hot end component can work in a range below the temperature resistance limit of the material, and the safe and reliable long-endurance work of the aero-engine is ensured. The common practice is to cool the hot end component after the high-pressure gas compressed by the compressor is introduced into the combustion chamber through the turbine shaft, so that the temperature of the cold gas directly determines the cooling effect of the hot end component. The supercritical CO2 power generation circulation system consists of a compressor, a heat exchanger, a turbine and other parts, and utilizes the characteristics of excellent heat exchange capacity and small compression power consumption of high-pressure and high-density CO2 working media in a supercritical state, and the heat exchanger absorbs heat of an external heat source to obtain high-efficiency power output. Currently, there is a need to develop a supercritical carbon dioxide power generation cycle system for cold air precooling. Disclosure of Invention The invention aims to provide a supercritical carbon dioxide power generation circulation system for cold air precooling so as to overcome the defects in the prior art. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The utility model provides a supercritical carbon dioxide power generation circulation system for air conditioning precooling, this supercritical carbon dioxide power generation circulation system is connected with the aeroengine air-cooling system, the aeroengine air-cooling system includes compressor, turbine axle and high temperature turbine device, the compressor passes through the turbine axle with the high temperature turbine device and links to each other, high temperature turbine device passes through turbine axle drive compressor formation high pressure gas A, supercritical carbon dioxide power generation circulation system includes compressor, generator, turbine device, regenerator and the cooler that connect gradually, takes sunken spiral heat exchanger of sphere between turbine device and regenerator, take sunken spiral heat exchanger to arrange in the turbine axle, take sunken spiral heat exchanger of sphere to be equipped with supercritical carbon dioxide in the spiral heat exchanger of sphere. Further, a plurality of spherical depressions are equidistantly arranged on the spiral heat exchanger with the spherical depressions. Further, three spherical recesses are formed in the same cross section of the spiral heat exchanger with the spherical recesses, the spherical recesses are not formed in the windward side of the spiral heat exchanger with the spherical recesses, and the diameter of the spherical recesses is smaller than 0.4D, wherein D is the diameter of a spiral tube in the spiral heat exchanger with the spherical recesses. Further, the compressor, the generator and the turbine device are coaxially connected. Further, the inlet side of the spiral heat exchanger with the spherical concave is upstream of the high-pressure gas A in the turbine shaft, and heat of the high-pressure gas A in the turbine shaft is conducted to supercritical carbon dioxide in the spiral heat exchanger with the spherical concave. Further, an inlet of the compressor is connected with an outlet of the cooler, an outlet of the turbine device is connected with a hot side inlet of the regenerator, an outlet of the compressor is connected with a cold side inlet of the regenerator, a hot side outlet of the regenerator is connected with an inlet of the cooler, a cold side outlet of the regenerator is connected with an inlet of the spiral heat exchanger with spherical concave, and an outlet of the spiral heat exchanger with spherical conca