阅读说明：本技术 一种超临界co2与空气联合循环太阳能发电系统及方法 (Supercritical CO2 and air combined cycle solar power generation system and method ) 是由 高炜 张一帆 张磊 吴帅帅 乔永强 张纯 于 2020-09-02 设计创作，主要内容包括：一种超临界CO2与空气联合循环太阳能发电系统一种超临界CO2与空气联合循环太阳能发电系统及方法,包括压气机,压气机依次连接空气回热器、空气涡轮、太阳能集热器和空气-二氧化碳换热器,空气-二氧化碳换热器的出口与空气换热器的入口相连通,空气换热器的出口与外界空气相连通；二氧化碳透平的出口与二氧化碳回热器的入口相连通,二氧化碳回热器的出口与预冷器的入口相连通,预冷器的出口与二氧化碳压缩机的入口相连通,二氧化碳压缩机的出口与二氧化碳回热器的入口相连通,二氧化碳回热器的出口与空气-二氧化碳换热器的入口相连通,空气-二氧化碳换热器的出口与二氧化碳透平的入口相连通。本发明具有减少材料费用,发电效率高的特点。(A supercritical CO2 and air combined cycle solar power generation system, a supercritical CO2 and air combined cycle solar power generation system and a method thereof, comprises a gas compressor, wherein the gas compressor is sequentially connected with an air heat regenerator, an air turbine, a solar heat collector and an air-carbon dioxide heat exchanger, the outlet of the air-carbon dioxide heat exchanger is communicated with the inlet of the air heat exchanger, and the outlet of the air heat exchanger is communicated with the outside air; the outlet of the carbon dioxide turbine is communicated with the inlet of a carbon dioxide heat regenerator, the outlet of the carbon dioxide heat regenerator is communicated with the inlet of a precooler, the outlet of the precooler is communicated with the inlet of a carbon dioxide compressor, the outlet of the carbon dioxide compressor is communicated with the inlet of the carbon dioxide heat regenerator, the outlet of the carbon dioxide heat regenerator is communicated with the inlet of an air-carbon dioxide heat exchanger, and the outlet of the air-carbon dioxide heat exchanger is communicated with the inlet of the carbon dioxide turbine. The invention has the characteristics of reduced material cost and high power generation efficiency.)

1. A supercritical CO2 and air combined cycle solar power generation system is characterized by comprising a compressor (1), wherein an outlet of the compressor (1) is communicated with a low-temperature side inlet of an air regenerator (2), a low-temperature side outlet of the air regenerator (2) is communicated with an inlet of an air turbine (3), an outlet of the air turbine (3) is communicated with an inlet of a solar heat collector (4), an outlet of the solar heat collector (4) is communicated with an air side inlet of an air-carbon dioxide heat exchanger (5), an air side outlet of the air-carbon dioxide heat exchanger (5) is communicated with a high-temperature side inlet of the air heat exchanger (2), and a high-temperature side outlet of the air heat exchanger (2) is communicated with outside air;

the outlet of the carbon dioxide turbine (6) is communicated with the high-temperature side inlet of the carbon dioxide regenerator (7), the high-temperature side outlet of the carbon dioxide regenerator (7) is communicated with the carbon dioxide side inlet of the precooler (8), the carbon dioxide side outlet of the precooler (8) is communicated with the inlet of the carbon dioxide compressor (9), the outlet of the carbon dioxide compressor (9) is communicated with the low-temperature side inlet of the carbon dioxide regenerator (7), the low-temperature side outlet of the carbon dioxide regenerator (7) is communicated with the carbon dioxide side inlet of the air-carbon dioxide heat exchanger (5), and the carbon dioxide side outlet of the air-carbon dioxide heat exchanger (5) is communicated with the inlet of the carbon dioxide turbine (6).

2. The method of claim 1, wherein the supercritical CO2 and air combined cycle solar power system,

firstly, an air compressor (1) absorbs air from the outside atmosphere to compress the air, then the air is sent to the cold side of an air heat regenerator (2) to absorb heat, the heated compressed air enters an air turbine (3) to expand to do work, the expanded low-pressure air enters a solar heat collector (4) to absorb heat, the air heated to high temperature enters an air-carbon dioxide heat exchanger (5) to release heat, the air after releasing heat still has high temperature, then the air enters the hot side of the air heat regenerator (2) to continue releasing heat, and finally the air is discharged into the outside atmosphere;

the supercritical carbon dioxide cycle is a closed cycle, high-pressure supercritical carbon dioxide absorbing heat released by high-temperature air in an air-carbon dioxide heat exchanger (5) enters a carbon dioxide turbine (6) to do work, the high-pressure supercritical carbon dioxide is expanded to become low-pressure supercritical carbon dioxide after doing work, the low-pressure supercritical carbon dioxide firstly enters a hot side of a carbon dioxide heat regenerator (7) to release waste heat, then enters a precooler (8) to be continuously cooled, the cooled low-pressure low-temperature supercritical carbon dioxide enters a carbon dioxide compressor (9) to be pressurized, the pressurized supercritical carbon dioxide enters a cold side of the carbon dioxide heat regenerator (7) to absorb heat, then enters the air-carbon dioxide heat exchanger (5) to continuously absorb heat, finally the highest temperature is reached, and finally the carbon dioxide turbine (6) completes final cycle.

Technical Field

The invention relates to the technical field of solar power generation, in particular to a supercritical CO2 and air combined cycle solar power generation system and method.

Background

Solar energy is an inexhaustible clean energy, and since solar photo-thermal power generation can reach the same high temperature as the solar temperature theoretically, as is well known, the higher the temperature is, the higher the thermal efficiency is, the more the solar photo-thermal power generation is emphasized.

The photothermal power generation needs to convert light energy into heat energy, and then the thermoelectric conversion is realized through the thermodynamic cycle, and at present, among numerous thermodynamic cycles, the supercritical brayton cycle is the most advantageous cycle form. The novel supercritical working media such as carbon dioxide, helium and nitrous oxide have the inherent advantages of high energy density, high heat transfer efficiency, simple system and the like, can greatly improve the heat-power conversion efficiency, reduce the equipment volume and have very high economical efficiency. Especially, after the temperature of the hot end reaches more than 500 ℃, the advantages of the supercritical carbon dioxide Brayton cycle become more and more obvious along with the temperature, and the thermal efficiency of the Brayton cycle gradually increases to the distance from the traditional steam cycle or other working medium cycles.

However, the heat collection temperature of the tower solar energy is not high at present, wherein the material problem accounts for a large part of the reasons, the high-temperature material actually applied to the power generation of the steam turbine set is within 620 ℃ and is far lower than the heat source temperature which can be reached by the solar heat collector, in addition, the solar photo-thermal power generation generally needs to consider heat storage, and the large-scale heat storage device is generally arranged on the ground, so the distances between the heat collector at the tower top and the heat storage device as well as the power generation set are far, and the main steam pressure of the power generation set with high efficiency is also far, so the pipe wall is very thick, if the pipe is made of high-temperature resistant alloy materials and is conveyed for a long distance, the cost is very huge.

Disclosure of Invention

In order to overcome the technical problems, the invention aims to provide a supercritical CO2 and air combined cycle solar power generation system and method, which have the characteristics of material cost reduction and high power generation efficiency.

In order to achieve the purpose, the invention adopts the technical scheme that:

a supercritical CO2 and air combined cycle solar power generation system comprises an air compressor 1, wherein an outlet of the air compressor 1 is communicated with a low-temperature side inlet of an air heat regenerator 2, a low-temperature side outlet of the air heat regenerator 2 is communicated with an inlet of an air turbine 3, an outlet of the air turbine 3 is communicated with an inlet of a solar heat collector 4, an outlet of the solar heat collector 4 is communicated with an air side inlet of an air-carbon dioxide heat exchanger 5, an air side outlet of the air-carbon dioxide heat exchanger 5 is communicated with a high-temperature side inlet of the air heat exchanger 2, and a high-temperature side outlet of the air heat exchanger 2 is communicated with outside air;

the outlet of the carbon dioxide turbine 6 is communicated with the high-temperature side inlet of the carbon dioxide heat regenerator 7, the high-temperature side outlet of the carbon dioxide heat regenerator 7 is communicated with the carbon dioxide side inlet of the precooler 8, the carbon dioxide side outlet of the precooler 8 is communicated with the inlet of the carbon dioxide compressor 9, the outlet of the carbon dioxide compressor 9 is communicated with the low-temperature side inlet of the carbon dioxide heat regenerator 7, the low-temperature side outlet of the carbon dioxide heat regenerator 7 is communicated with the carbon dioxide side inlet of the air-carbon dioxide heat exchanger 5, and the carbon dioxide side outlet of the air-carbon dioxide heat exchanger 5 is communicated with the inlet of the carbon.

A method for a supercritical CO2 and air combined cycle solar power generation system comprises the steps that firstly, an air compressor 1 absorbs air from outside atmosphere to be compressed, then the air is sent to a cold side of an air heat regenerator 2 to absorb heat, the heated compressed air enters an air turbine 3 to expand and do work, the expanded low-pressure air enters a solar heat collector 4 to absorb heat, the air heated to high temperature enters an air-carbon dioxide heat exchanger 5 to release heat, the air after heat release still has high temperature, then enters a hot side of the air heat regenerator 2 to continue heat release, and finally the air is discharged to the outside atmosphere;

the supercritical carbon dioxide cycle is a closed cycle, high-pressure supercritical carbon dioxide which absorbs heat released by high-temperature air in the air-carbon dioxide heat exchanger 5 enters the carbon dioxide turbine 6 to do work and becomes low-pressure supercritical carbon dioxide after expansion work, the low-pressure supercritical carbon dioxide firstly enters the hot side of the carbon dioxide heat regenerator 7 to release waste heat and then enters the precooler 8 to be continuously cooled, the cooled low-pressure low-temperature supercritical carbon dioxide enters the carbon dioxide compressor 9 to be pressurized, the pressurized supercritical carbon dioxide enters the cold side of the carbon dioxide heat regenerator 7 to absorb heat and then enters the air-carbon dioxide heat exchanger 5 to continuously absorb heat, finally the temperature reaches the highest temperature, and finally the cooled low-pressure low-temperature supercritical carbon dioxide enters the carbon dioxide turbine 6 to.

The invention has the beneficial effects that:

according to the supercritical CO2 and air combined cycle solar power generation system, firstly, the exhaust of an air Brayton cycle turbine is used as a heat absorption working medium of a solar heat collector, and the pressure is close to normal pressure, so that the heat collector and a channel material for conveying fluid can be selected and commonly used, and the problem of strength at high temperature is not considered. When the high-temperature hot fluid is conveyed to the energy storage system and the vicinity of the unit, the high-temperature alloy material is selected, so that the material cost can be greatly reduced. In addition, the invention adopts a supercritical carbon dioxide generator set, has the characteristic of small volume and can also reduce the material consumption. In addition, the system adopts the combination of air Brayton cycle and a supercritical carbon dioxide generator set, so that the generating efficiency is higher.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

The system comprises an air compressor 1, an air heat regenerator 2, an air turbine 3, a solar heat collector 4, an air-carbon dioxide heat exchanger 5, a carbon dioxide turbine 6, a carbon dioxide heat regenerator 7, a precooler 8 and a carbon dioxide compressor 9.

Detailed Description

The present invention will be described in further detail with reference to examples.

Referring to fig. 1, the supercritical CO2 and air combined cycle solar power generation system according to the present invention comprises a compressor 1, an air heat regenerator 2, an air turbine 3, a solar heat collector 4, an air-carbon dioxide heat exchanger 5, a carbon dioxide turbine 6, a carbon dioxide heat regenerator 7, a precooler 8, and a carbon dioxide compressor 9, wherein an inlet of the compressor 1 is communicated with the outside air, an outlet of the compressor 1 is communicated with a low temperature side inlet of the air heat regenerator 2, a low temperature side outlet of the air heat regenerator 2 is communicated with an inlet of the air turbine, an outlet of the air turbine 3 is communicated with an inlet of the solar heat collector 4, an outlet of the solar heat collector 4 is communicated with an air side inlet of the air-carbon dioxide heat exchanger 5, an air side outlet of the air-carbon dioxide heat exchanger 5 is communicated with a high temperature side inlet of, the outlet of the high-temperature side of the air heat exchanger 2 is communicated with the outside air, the outlet of the carbon dioxide turbine 6 is communicated with the inlet of the high-temperature side of the carbon dioxide regenerator 7, the outlet of the high-temperature side of the carbon dioxide regenerator 7 is communicated with the inlet of the carbon dioxide side of the precooler 8, the outlet of the carbon dioxide side of the precooler 8 is communicated with the inlet of the carbon dioxide compressor 9, the outlet of the carbon dioxide compressor 9 is communicated with the inlet of the low-temperature side of the carbon dioxide regenerator 7, the outlet of the low-temperature side of the carbon dioxide regenerator 7 is communicated with the inlet of the carbon dioxide side of the air-carbon dioxide heat exchanger 5, and the outlet of.

The system firstly adopts the exhaust of the air Brayton cycle turbine as the heat absorption working medium of the solar heat collector, and the pressure is close to the normal pressure, so that the heat collector and the channel material for conveying fluid can be selected and commonly used, and the problem of strength at high temperature does not need to be considered. When the high-temperature hot fluid is conveyed to the energy storage system and the vicinity of the unit, the high-temperature alloy material is selected, so that the material cost can be greatly reduced. In addition, the invention adopts a supercritical carbon dioxide generator set, has the characteristic of small volume and can also reduce the material consumption. In addition, the system adopts the combination of air Brayton cycle and a supercritical carbon dioxide generator set, so that the generating efficiency is higher.

The specific working process of the invention is as follows:

firstly, an air compressor 1 absorbs air from the outside atmosphere to compress the air, then the air is sent to the cold side of an air heat regenerator 2 to absorb heat, the heated compressed air enters an air turbine 3 to expand and do work, the expanded low-pressure air enters a solar heat collector 4 to absorb heat, the air heated to high temperature enters an air-carbon dioxide heat exchanger 5 to release heat, the air after heat release still has higher temperature, then the air enters the hot side of the air heat regenerator 2 to continue heat release, and finally the air is discharged into the outside atmosphere;

the supercritical carbon dioxide cycle is a closed cycle, high-pressure supercritical carbon dioxide which absorbs heat released by high-temperature air in the air-carbon dioxide heat exchanger 5 enters the carbon dioxide turbine 6 to do work and becomes low-pressure supercritical carbon dioxide after expansion work, the low-pressure supercritical carbon dioxide firstly enters the hot side of the carbon dioxide heat regenerator 7 to release waste heat and then enters the precooler 8 to be continuously cooled, the cooled low-pressure low-temperature supercritical carbon dioxide enters the carbon dioxide compressor 9 to be pressurized, the pressurized supercritical carbon dioxide enters the cold side of the carbon dioxide heat regenerator 7 to absorb heat and then enters the air-carbon dioxide heat exchanger 5 to continuously absorb heat, finally the temperature reaches the highest temperature, and finally the cooled low-pressure low-temperature supercritical carbon dioxide enters the carbon dioxide turbine 6 to.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.