阅读说明：本技术 一种太阳能风能联合储能发电系统及方法 (Solar energy and wind energy combined energy storage power generation system and method ) 是由 张纯 杨玉 白文刚 张磊 张一帆 李红智 于 2019-11-27 设计创作，主要内容包括：本发明公开了一种太阳能风能联合储能发电系统及方法,包括超临界二氧化碳储能发电系统、风力发电系统、熔融盐储能系统、镜场及集热器,其中,熔融盐储能系统的出口与超临界二氧化碳储能发电系统的吸热侧入口相连通,超临界二氧化碳储能发电系统的吸热侧出口与熔融盐储能系统的入口相连通,太阳光线经镜场折射后照射到集热器中,熔融盐储能系统的吸热侧入口与集热器的出口相连通,熔融盐储能系统的吸热侧出口与集热器的入口相连通,风力发电系统与超临界二氧化碳储能发电系统中压缩机的电源接口相连接,该系统及方法能够实现太阳能光热蓄热和风能压缩超临界二氧化碳储能发电的结合。(The invention discloses a solar energy and wind energy combined energy storage power generation system and a method, which comprises a supercritical carbon dioxide energy storage power generation system, a wind power generation system, a fused salt energy storage system, a mirror field and a heat collector, wherein the outlet of the fused salt energy storage system is communicated with the heat absorption side inlet of the supercritical carbon dioxide energy storage and generation system, the heat absorption side outlet of the supercritical carbon dioxide energy storage and generation system is communicated with the inlet of the fused salt energy storage system, the solar rays are refracted by a mirror field and then irradiated into the heat collector, the heat absorption side inlet of the fused salt energy storage system is communicated with the outlet of the heat collector, the heat absorption side outlet of the fused salt energy storage system is communicated with the inlet of the heat collector, the wind power generation system is connected with the power supply interface of the compressor in the supercritical carbon dioxide energy storage and generation system, the system and the method can realize the combination of solar photo-thermal heat storage and wind energy compression supercritical carbon dioxide energy storage power generation.)

1. The solar energy and wind energy combined energy storage power generation system is characterized by comprising a supercritical carbon dioxide energy storage power generation system, a wind power generation system, a fused salt energy storage system, a mirror field (1) and a heat collector (2), wherein an outlet of the fused salt energy storage system is communicated with an inlet of a heat absorption side of the supercritical carbon dioxide energy storage power generation system, an outlet of the heat absorption side of the supercritical carbon dioxide energy storage power generation system is communicated with an inlet of the fused salt energy storage system, solar rays are irradiated into the heat collector (2) after being refracted by the mirror field (1), an inlet of the heat absorption side of the fused salt energy storage system is communicated with an outlet of the fused salt energy storage system, an outlet of the heat absorption side of the fused salt energy storage system is communicated with an inlet of the heat collector (2), and the wind power generation system is connected with a power supply.

2. The solar energy and wind energy combined energy storage and power generation system according to claim 1, wherein the molten salt energy storage system comprises a high-temperature molten salt tank (3) and a low-temperature molten salt tank (5), and the supercritical carbon dioxide energy storage and power generation system comprises a heat exchanger (4), a motor (8), a turbine (12), a regenerator (11), a low-pressure tank (15), a compressor (9), a high-pressure tank (10), a regenerator (11) and a generator (13);

an outlet of the high-temperature molten salt tank (3) is communicated with a heat release side inlet of the heat exchanger (4), a heat release side outlet of the heat exchanger (4) is communicated with an inlet of the low-temperature molten salt tank (5), an outlet of the low-temperature molten salt tank (5) is communicated with an inlet of the heat collector (2), and an outlet of the heat collector (2) is communicated with an inlet of the high-temperature molten salt tank (3);

the heat absorption side outlet of the heat exchanger (4) is communicated with the heat absorption side inlet of the heat exchanger (4) through a turbine (12), the heat release side of a heat regenerator (11), a low-pressure tank (15), a compressor (9), a high-pressure tank (10) and the heat absorption side of the heat regenerator (11) in sequence, the turbine (12) is connected with the output shaft of a generator (13), a motor (8) is connected with the driving shaft of the compressor (9), and the power interface of the motor (8) is connected with the output end of a wind power generation system.

3. Solar-wind energy combined storage and generation system according to claim 2, characterized in that the wind power generation system comprises a windmill (6) and a windmill generator (7), wherein the driving shaft of the windmill generator (7) is connected with the windmill (6), and the output end of the windmill generator (7) is connected with the power interface of the electric motor (8).

4. The solar energy and wind energy combined energy storage power generation method is characterized in that the solar energy and wind energy combined energy storage power generation system based on claim 2 comprises the following steps:

under the conditions of normal solar irradiation and normal wind power, sunlight is focused on a heat collector (2) by a mirror field (1), molten salt in the heat collector (2) is heated and then enters a high-temperature molten salt tank (3), solar energy is stored in the high-temperature molten salt tank (3) in the form of sensible heat of the high-temperature molten salt, the high-temperature molten salt stored in the high-temperature molten salt tank (3) enters a heat exchanger (4) to heat supercritical carbon dioxide, then enters a low-temperature molten salt tank (5), and the low-temperature molten salt stored in the low-temperature molten salt tank (5) enters the heat collector (2) to be reheated; the electric energy generated by the wind power generation system drives a motor (8) to work, the motor (8) drives a compressor (9) to work, supercritical carbon dioxide output by a heat exchanger (4) enters a turbine (12) to do work, the turbine (12) drives a generator (13) to generate power, the carbon dioxide output by the turbine (12) enters a low-pressure tank (15) after being released heat by a heat regenerator (11) and cooled by a cooler (14) in sequence, the carbon dioxide output by the low-pressure tank (15) enters a high-pressure tank (10) after being compressed by the compressor (9), and the carbon dioxide output by the high-pressure tank (10) enters the heat exchanger (4) to absorb heat after being reheated by the heat regenerator (11) so as to form high-temperature supercritical carbon dioxide;

when solar irradiation is abnormal, the heat collector (2) cannot heat the molten salt, and the high-temperature molten salt stored in the high-temperature molten salt tank (3) enters the heat exchanger (4) to heat carbon dioxide to form high-temperature supercritical carbon dioxide so as to maintain the operation of the supercritical carbon dioxide energy storage power generation system;

when wind power is abnormal, the wind power generation system cannot normally operate, carbon dioxide stored in the high-pressure tank (10) is used for entering the heat exchanger (4) after being reheated by the heat regenerator (11), and then the carbon dioxide is subjected to heat exchange by the heat exchanger (4) to form high-temperature supercritical carbon dioxide so as to maintain the operation of the supercritical carbon dioxide energy storage power generation system.

Technical Field

The invention belongs to the field of wind energy and solar energy power generation, and relates to a solar energy and wind energy combined energy storage power generation system and method.

Background

Solar energy is an energy source generated by solar radiation, wind energy is kinetic energy of air flowing on the surface of the earth, and the two energy sources are rich in resources, have no pollution to the environment and are increasingly used for generating electricity. Due to the influence of weather, solar energy and wind energy are unstable, and the stable and continuous output of electric power cannot be ensured when the solar energy and wind energy are used for power generation. In recent years, energy storage technology has been rapidly developed. The energy storage system can realize large-capacity heat or energy storage, and stably releases the heat or energy for power generation or other utilization when the energy is needed.

The molten salt energy storage technology is the mainstream high-temperature heat storage technology in the world at present, has low cost, and is widely applied to photo-thermal power generation energy storage in countries such as Europe. The compressed air energy storage refers to an energy storage mode that electric energy is used for compressing air in a low-load valley period of a power grid, the air is sealed in a scrapped mine, a settled seabed gas storage tank, a cave, an overdue oil and gas well or a newly-built gas storage well at high pressure, and the compressed air is released to push a steam turbine to generate electricity in a high-load peak period of the power grid. Even if the air is compressed, the density of the air is still low, and a large-scale air storage device needs to be built.

The use of carbon dioxide instead of air as the working medium for energy storage is an effective solution to the above problems. Carbon dioxide is non-toxic, non-flammable, high in density, and critical temperature (T)_c31.1 deg.C, lower critical pressure (P)_c7.38MPa), the density of supercritical carbon dioxide is close to liquid, the viscosity is close to gas, the fluid has better fluidity and transmission characteristic, the volume is obviously reduced, the compressed supercritical carbon dioxide is used for storing energy, the scale of a storage system can be obviously reduced, the cost is reduced, and the application is more flexible.

In the currently published reports about solar energy and wind energy combined energy storage, for example, the Chinese patent CN 207064027U combines compressed air energy storage with solar energy heat storage, and the Chinese patent CN 207603498U combines photovoltaic power generation and wind power generation with storage battery energy storage, and no report combines solar photothermal heat storage with wind energy compression supercritical carbon dioxide energy storage and power generation is available.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a solar energy and wind energy combined energy storage power generation system and method, which can realize the combination of solar photo-thermal heat storage and wind energy compression supercritical carbon dioxide energy storage power generation.

In order to achieve the purpose, the solar energy and wind energy combined energy storage power generation system comprises a supercritical carbon dioxide energy storage power generation system, a wind power generation system, a molten salt energy storage system, a mirror field and a heat collector, wherein an outlet of the molten salt energy storage system is communicated with an inlet at the heat absorption side of the supercritical carbon dioxide energy storage power generation system, an outlet at the heat absorption side of the supercritical carbon dioxide energy storage power generation system is communicated with an inlet of the molten salt energy storage system, solar rays are irradiated into the heat collector after being refracted by the mirror field, an inlet at the heat absorption side of the molten salt energy storage system is communicated with an outlet of the heat collector, an outlet at the heat absorption side of the molten salt energy storage system is communicated with an inlet of the heat collector, and the wind power generation.

The molten salt energy storage system comprises a high-temperature molten salt tank and a low-temperature molten salt tank, and the supercritical carbon dioxide energy storage power generation system comprises a heat exchanger, a motor, a turbine, a heat regenerator, a low-pressure tank, a compressor, a high-pressure tank, a heat regenerator and a generator;

the outlet of the high-temperature molten salt tank is communicated with the heat release side inlet of the heat exchanger, the heat release side outlet of the heat exchanger is communicated with the inlet of the low-temperature molten salt tank, the outlet of the low-temperature molten salt tank is communicated with the inlet of the heat collector, and the outlet of the heat collector is communicated with the inlet of the high-temperature molten salt tank;

the heat absorption side outlet of the heat exchanger is communicated with the heat absorption side inlet of the heat exchanger through a turbine, the heat release side of the heat regenerator, the low-pressure tank, the compressor, the high-pressure tank and the heat absorption side of the heat regenerator in sequence, the turbine is connected with the output shaft of the generator, the motor is connected with the driving shaft of the compressor, and the power supply interface of the motor is connected with the output end of the wind power generation system.

The wind power generation system comprises a windmill and a windmill generator, wherein a driving shaft of the windmill generator is connected with the windmill, and an output end of the windmill generator is connected with a power interface of the motor.

The solar energy and wind energy combined energy storage power generation method comprises the following steps:

under the conditions of normal solar irradiation and normal wind power, sunlight is focused on a heat collector by a mirror field, molten salt in the heat collector is heated and then enters a high-temperature molten salt tank, solar energy is stored in the high-temperature molten salt tank 3 in the form of sensible heat of the high-temperature molten salt, the high-temperature molten salt stored in the high-temperature molten salt tank enters a heat exchanger to heat supercritical carbon dioxide and then enters a low-temperature molten salt tank, and the low-temperature molten salt stored in the low-temperature molten salt tank enters the heat collector to be reheated; the electric energy generated by the wind power generation system drives the motor to work, the motor drives the compressor to work, the supercritical carbon dioxide output by the heat exchanger enters the turbine to do work, the turbine drives the generator to generate power, the carbon dioxide output by the turbine enters the low-pressure tank after being sequentially subjected to heat release by the heat regenerator and cooling by the cooler, the carbon dioxide output by the low-pressure tank enters the high-pressure tank after being compressed by the compressor, and the carbon dioxide output by the high-pressure tank enters the heat exchanger to absorb heat after being subjected to heat release by the heat regenerator so as to form high-temperature supercritical carbon dioxide;

when solar irradiation is abnormal, the heat collector cannot heat the molten salt, and the high-temperature molten salt stored in the high-temperature molten salt tank enters the heat exchanger to heat carbon dioxide to form high-temperature supercritical carbon dioxide so as to maintain the operation of the supercritical carbon dioxide energy storage power generation system;

when wind power is abnormal, the wind power generation system cannot normally operate, carbon dioxide stored in the high-pressure tank enters the heat exchanger after being reheated by the heat regenerator, and then high-temperature supercritical carbon dioxide is formed by heat exchange of the heat exchanger so as to maintain the operation of the supercritical carbon dioxide energy storage power generation system.

The invention has the following beneficial effects:

the solar energy and wind energy combined energy storage power generation system and the method thereof utilize solar energy to store in the form of sensible heat of molten salt, electricity generated by wind energy is compressed into carbon dioxide by a compressor and stored in the form of high-pressure carbon dioxide, and then the sensible heat of the molten salt is released to the high-pressure carbon dioxide by a heat exchanger to form high-temperature supercritical carbon dioxide so as to maintain the work of the supercritical carbon dioxide power generation system, thereby realizing the combination of solar photo-thermal heat storage and wind energy compression supercritical carbon dioxide energy storage power generation.

Drawings

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

Wherein, 1 is a mirror field, 2 is a heat collector, 3 is a high-temperature molten salt tank, 4 is a heat exchanger, 5 is a low-temperature molten salt tank, 6 is a windmill, 7 is a windmill generator, 8 is a motor, 9 is a compressor, 10 is a high-pressure tank, 11 is a heat regenerator, 12 is a turbine, 13 is a generator, 14 is a cooler, and 15 is a low-pressure tank.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1, the solar energy and wind energy combined energy storage power generation system comprises a supercritical carbon dioxide energy storage power generation system, a wind power generation system, a molten salt energy storage system, a mirror field 1 and a heat collector 2, wherein an outlet of the molten salt energy storage system is communicated with an inlet of a heat absorption side of the supercritical carbon dioxide energy storage power generation system, an outlet of the heat absorption side of the supercritical carbon dioxide energy storage power generation system is communicated with an inlet of the molten salt energy storage system, solar rays are irradiated into the heat collector 2 after being refracted by the mirror field 1, an inlet of the heat absorption side of the molten salt energy storage system is communicated with an outlet of the heat collector 2, an outlet of the heat absorption side of the molten salt energy storage system is communicated with an inlet of the heat collector 2, and the wind power generation system is.

The molten salt energy storage system comprises a high-temperature molten salt tank 3 and a low-temperature molten salt tank 5, and the supercritical carbon dioxide energy storage power generation system comprises a heat exchanger 4, a motor 8, a turbine 12, a heat regenerator 11, a low-pressure tank 15, a compressor 9, a high-pressure tank 10, a heat regenerator 11 and a power generator 13; an outlet of the high-temperature molten salt tank 3 is communicated with a heat release side inlet of the heat exchanger 4, a heat release side outlet of the heat exchanger 4 is communicated with an inlet of the low-temperature molten salt tank 5, an outlet of the low-temperature molten salt tank 5 is communicated with an inlet of the heat collector 2, and an outlet of the heat collector 2 is communicated with an inlet of the high-temperature molten salt tank 3; the heat absorption side outlet of the heat exchanger 4 is communicated with the heat absorption side inlet of the heat exchanger 4 through a turbine 12, the heat release side of a heat regenerator 11, a low pressure tank 15, a compressor 9, a high pressure tank 10 and the heat absorption side of the heat regenerator 11 in sequence, the turbine 12 is connected with the output shaft of a generator 13, an electric motor 8 is connected with the driving shaft of the compressor 9, the power supply interface of the electric motor 8 is connected with the output end of a wind power generation system, in addition, the wind power generation system comprises a windmill 6 and a windmill generator 7, wherein the driving shaft of the windmill generator 7 is connected with the windmill 6, and the output end of the windmill generator 7 is connected with the power.

The solar energy and wind energy combined energy storage power generation method comprises the following steps:

under the conditions of normal solar irradiation and normal wind power, sunlight is focused on a heat collector 2 by a mirror field 1, molten salt in the heat collector 2 is heated and then enters a high-temperature molten salt tank 3, solar energy is stored in the high-temperature molten salt tank 3 in the form of sensible heat of the high-temperature molten salt, the high-temperature molten salt stored in the high-temperature molten salt tank 3 enters a heat exchanger 4 to heat supercritical carbon dioxide and then enters a low-temperature molten salt tank 5, and the low-temperature molten salt stored in the low-temperature molten salt tank 5 enters the heat collector 2 to be reheated; the electric energy generated by the wind power generation system drives the motor 8 to work, the motor 8 drives the compressor 9 to work, the supercritical carbon dioxide output by the heat exchanger 4 enters the turbine 12 to do work, the turbine 12 drives the generator 13 to generate electricity, the carbon dioxide output by the turbine 12 enters the low-pressure tank 15 after being sequentially subjected to heat release by the heat regenerator 11 and cooling by the cooler 14, the carbon dioxide output by the low-pressure tank 15 is compressed by the compressor 9 and then enters the high-pressure tank 10, and the carbon dioxide output by the high-pressure tank 10 enters the heat exchanger 4 to absorb heat after being subjected to heat regeneration by the heat regenerator 11 so as to form high-temperature supercritical carbon dioxide;

when solar irradiation is abnormal, the heat collector 2 cannot heat the molten salt, and the high-temperature molten salt stored in the high-temperature molten salt tank 3 enters the heat exchanger 4 to heat carbon dioxide to form high-temperature supercritical carbon dioxide so as to maintain the operation of the supercritical carbon dioxide energy storage power generation system;

when wind power is abnormal, the wind power generation system cannot normally operate, carbon dioxide stored in the high-pressure tank 10 is used for entering the heat exchanger 4 after being reheated by the heat regenerator 11, and then high-temperature supercritical carbon dioxide is formed through heat exchange of the heat exchanger 4, so that the operation of the supercritical carbon dioxide energy storage power generation system is maintained.

It should be noted that the above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and the specific implementation methods, such as the type of the compressor 9, the types of the high pressure tank 10 and the low pressure tank 15, etc., can be modified and improved without departing from the scope and the basic spirit of the present invention as defined in the claims.