Photothermal coupled isothermal compressed air multi-mode power generation system

Abstract

The present invention discloses a photothermal coupled isothermal compressed air multi-mode power generation system, which includes an isothermal compression component, a hydraulic constant pressure air storage component, a photothermal heat storage component, a heat exchange component and a heat recovery air turbine component. The photothermal coupled isothermal compressed air multi-mode power generation system of the present invention can realize the processes of energy storage, energy release and photothermal power generation through combined operation, has multiple operating modes, is a completely clean photothermal power generation and energy storage system, is efficient and flexible, and is suitable for the price policies of different regions, different seasons and different power grids.

Description

Technical Field

[0001] The present invention relates to the field of power generation, and in particular to a photothermal coupled isothermal compressed air multi-mode power generation system. Background Art

[0002] Solar thermal power generation technology has many superior characteristics. Among related technologies, the thermal collection efficiency of solar thermal power generation technology is relatively low, which affects the scale of its application. In addition, due to the increase in the scale of new clean energy power generation, clean energy power generation methods generally have problems such as intermittent and fluctuating power generation quality. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention proposes a photothermal coupled isothermal compressed air multi-mode power generation system with high power generation efficiency and low cost.

[0005] According to an embodiment of the present invention, the photovoltaic coupled isothermal compressed air multi-mode power generation system includes: an isothermal compression component, which is used to compress gas; a hydraulic constant pressure gas storage component, which is connected to the isothermal compression component to store the compressed gas flowing out of the isothermal compression component; a photovoltaic heat storage component, in which a heat exchange medium is stored, and the photovoltaic heat storage component is used to absorb solar energy to heat the heat exchange medium; a heat exchange component, which has a first channel and a second channel that are independent of each other and can exchange heat, one end of the first channel is connected to one end of the photovoltaic heat storage component, so that the heat exchange medium flowing out of the photovoltaic heat storage component flows into the first channel, and the other end of the first channel is connected to the photovoltaic heat storage component. The other end of the solar thermal heat storage component is connected so that the heat exchange medium flowing out through the first channel flows into the solar thermal heat storage component so that the heat exchange medium circulates between the first channel and the solar thermal heat storage component. The second channel is connected with the isothermal compression component and the hydraulic constant pressure gas storage component respectively, so that the compressed gas flowing out of the hydraulic constant pressure gas storage component or the compressed gas flowing out of the isothermal compression component flows into the second channel to exchange heat with the heat exchange medium in the first channel; the regenerative air turbine component is connected with the second channel so that the compressed gas after heat exchange in the second channel flows into the regenerative air turbine component, and the regenerative air turbine component is used to generate electricity using the compressed gas.

[0006] The solar-thermal coupled isothermal compressed air multi-mode power generation system of the present invention is provided with a hydraulic constant-pressure gas storage component, a heat exchange component, a solar-thermal heat storage component and a heat-recovery air turbine component, thereby coupling a new large-scale solar-thermal system with a large-scale compressed air energy storage system, which can give full play to the advantages of each system, increase the scale of power generation of new clean energy, obtain extremely high comprehensive system benefits, and be more adaptable to the future development needs of the clean energy power generation and energy storage market.

[0007] In some embodiments, the hydraulic constant pressure gas storage component includes a water pool and a high-pressure gas storage tank, the water pool is used to store liquid, the high-pressure gas storage tank is a closed container and is used to store compressed gas, the top of the high-pressure gas storage tank is connected to the isothermal compression component so that the compressed gas flowing out of the isothermal compression component flows into the high-pressure gas storage tank, the bottom of the water pool is connected to the bottom of the high-pressure gas storage tank, the hydraulic constant pressure gas storage component has an exhaust state and a gas storage state, in the exhaust state, the water in the water pool flows into the high-pressure gas storage tank so that the compressed gas in the high-pressure gas storage tank flows into the first channel of the heat exchange component, in the gas storage state, the liquid in the high-pressure gas storage tank flows into the water pool so that the compressed gas flows into the high-pressure gas storage tank, or the hydraulic constant pressure gas storage component can be a gas storage salt cave, an artificial gas storage cave or a gravity constant pressure gas storage system, etc.

[0008] In some embodiments, the photothermal coupled isothermal compressed air multi-mode power generation system also includes a high-pressure water pump and a hydraulic motor, the two ends of the high-pressure water pump are respectively connected to the water pool and the high-pressure gas storage tank, so that in the exhaust state, the high-pressure water pump works to flow the water in the water pool into the high-pressure gas storage tank, and the two ends of the hydraulic motor are respectively connected to the water pool and the high-pressure gas storage tank, so that in the gas storage state, the liquid in the high-pressure gas storage tank flows into the water pool, so that the hydraulic motor generates electricity.

[0009] In some embodiments, the solar thermal storage component includes: a plurality of dish-type collectors with tiltable heat collection cavities, the dish-type collectors are used to absorb the solar energy for heating, and the heat exchange medium is a fluid medium such as molten salt or high-temperature heat transfer oil; a hot tank and a cold tank, one end of each of the dish-type collectors is connected to the hot tank, so that the heat exchange medium heated by the dish-type collector flows into the hot tank to realize parallel heat collection of multiple dispersed dish-type collectors, the hot tank is connected to the first channel of the heat exchange component, so that the heat exchange medium flowing out of the hot tank flows into the first channel of the heat exchange component, the cold tank is connected to the first channel of the heat exchange component, so that the heat exchange medium flowing out of the first channel flows into the cold tank, and the other end of each of the dish-type collectors is connected to the cold tank, so that the heat exchange medium flowing out of the cold tank flows into the dish-type collector.

[0010] In some embodiments, the regenerative air turbine assembly includes an expander and a generator, wherein the expander is connected to the second channel of the heat exchange assembly so that the compressed gas flowing out through the second channel flows into the expander to expand the compressed gas, and the expander is connected to the generator so that the gas flowing out through the expander flows into the generator to generate electricity.

[0011] In some embodiments, the heat exchange component includes a first heat exchange component, a second heat exchange component, and a third heat exchange component, and the expander includes a first expander, a second expander, and a third expander. The two ends of the first channel of the first heat exchange component, the two ends of the first channel of the second heat exchange component, and each of the two ends of the first channel of the third heat exchange component are respectively connected to the two ends of the solar thermal heat storage component, and one end of the second channel of the first heat exchange component is respectively connected to the isothermal compression component and the hydraulic constant pressure gas storage component, so that the compressed gas in the isothermal compression component and the hydraulic constant pressure gas storage component flows into the second channel of the first heat exchange component. The other end of the second channel of the first heat exchange component is connected to the first expander, and the two ends of the second channel of the second heat exchange component are respectively connected to the first expander and the second expander, so that the gas flowing out of the first expander flows into the second expander through the second channel of the second heat exchange component. The two ends of the second channel of the third heat exchange component are respectively connected to the second expander and the third expander, so that the gas flowing out of the second expander flows into the third expander through the second channel of the third heat exchange component. The third expander is connected to the power generation component, so that the gas flowing out of the third expander flows into the generator.

[0012] In some embodiments, the photothermal coupled isothermal compressed air multi-mode power generation system also includes an air preheater, and the air preheater includes a third channel and a fourth channel that can independently perform heat exchange with each other, one end of the third channel is respectively connected to the isothermal compression component and the hydraulic constant pressure gas storage component, so that the compressed gas flowing out of the isothermal compression component and the compressed gas flowing out of the hydraulic constant pressure gas storage component flow into the third channel, the other end of the third channel is connected to the second channel of the heat exchange component, so that the compressed gas flowing out of the third channel flows into the second channel, and the fourth channel is connected to the heat recovery air turbine component, so that the gas flowing out of the heat recovery air turbine component flows into the fourth channel.

[0013] In some embodiments, the photothermal coupled isothermal compressed air multi-mode power generation system also includes a first cooling component and a second cooling component. The first cooling component is arranged in the isothermal compression component to cool the compressed gas in the isothermal compression component. The first cooling component is connected to the second cooling component so that the compressed gas cooled by the first cooling component flows into the second cooling component for cooling. The second cooling component is respectively connected to the first channels of the hydraulic constant pressure gas storage component and the heat exchange component so that the compressed gas flowing out of the second cooling component flows into the hydraulic constant pressure gas storage component, or the compressed gas flowing out of the second cooling component flows into the heat exchange component.

[0014] In some embodiments, the photothermal coupled isothermal compressed air multi-mode power generation system further includes a power supply component, which is connected to the isothermal compression component so that the power supply component supplies power to the isothermal compression component.

[0015] In some embodiments, the solar-thermal coupled isothermal compressed air multi-mode power generation system has a first state, a second state, a third state and a fourth state. In the first state, each of the isothermal compression component, the regenerative air turbine component and the solar-thermal heat storage component operates all day to provide electrical energy. In the second state, the isothermal compression component operates at night, the hydraulic constant pressure gas storage component stores gas at night and exhausts gas during the day, the regenerative air turbine component and the solar-thermal heat storage component operate during the day, so that the compressed gas in the hydraulic constant pressure gas storage component generates electricity. In the third state, the isothermal compression component operates at full load at night, the regenerative air turbine component operates all day, the hydraulic constant pressure gas storage component stores gas at night, so that most of the compressed gas generated by the isothermal compression component is stored in the hydraulic constant pressure gas storage component at night and the regenerative air turbine component operates all day. The hot air turbine component releases energy from a small portion of the compressed gas produced by the isothermal compression component to generate electricity. The hydraulic constant pressure gas storage component is exhausted during the day so that the compressed gas in the hydraulic constant pressure gas storage component flows into the heat recovery air turbine component to enable the heat recovery air turbine component to release energy and generate electricity. In the fourth state, the isothermal compression component and the heat recovery air turbine component are both operated throughout the day. The hydraulic constant pressure gas storage component generates stored gas at night so that most of the compressed gas produced by the isothermal compression component is stored in the hydraulic constant pressure gas storage component at night and the heat recovery air turbine component releases energy from a small portion of the compressed gas produced by the isothermal compression component to generate electricity. The hydraulic constant pressure gas storage component is exhausted during the day so that the compressed gas in the gas outlet component and the compressed gas produced by the isothermal compression component flow into the heat recovery air turbine component together to release energy and generate electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1Schematic diagram of the structure of the photothermal coupled isothermal compressed air multi-mode power generation system according to an embodiment of the present invention.

[0017] Power generation system 100;

[0018] Isothermal compression component 1; first cooling component 11; second cooling component 12;

[0019] Hydraulic constant pressure gas storage assembly 2; water tank 21; high pressure gas storage tank 22; high pressure water pump 23; hydraulic motor 24;

[0020] Solar thermal storage component 3; dish collector 31; hot tank 32; cold tank 33;

[0021] Heat exchange component 4; first heat exchange component 41; second heat exchange component 42; third heat exchange component 43;

[0022] Regenerative air turbine assembly 5; expander 51; first expander 511; second expander 512; third expander 513; generator 52;

[0023] Air preheater 6; first pump 7; second pump 8, power supply component 9. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] The following describes a photothermal coupled isothermal compressed air multi-mode power generation system according to an embodiment of the present invention with reference to the accompanying drawings.

[0026] like Figure 1 As shown, the solar-thermal coupled isothermal compressed air multi-mode power generation system according to an embodiment of the present invention includes an isothermal compression component 1, a hydraulic constant pressure air storage component 2, a heat exchange component 4, a solar-thermal heat storage component 3 and a heat recovery air turbine component 5.

[0027] The isothermal compression assembly 1 is used to compress gas. Specifically, Figure 1 As shown, the isothermal compression component 1 can be an isothermal compressor, which can compress normal-pressure gas (such as air) into high-pressure gas.

[0028] The hydraulic constant pressure gas storage component 2 is connected to the isothermal compression component 1 to store the compressed gas flowing out of the isothermal compression component 1. Figure 1 As shown, the inlet of the hydraulic constant pressure gas storage component 2 is connected to the outlet of the isothermal compression component 1, and the compressed gas generated by the isothermal compression component 1 can flow into the hydraulic constant pressure gas storage component 2 for storage.

[0029] The solar thermal storage component 3 stores a heat exchange medium, and the solar thermal storage component 3 is used to absorb solar energy to heat the heat exchange medium. Figure 1 As shown, a heat exchange medium is provided in the solar thermal storage component 3 (the heat storage medium is molten salt, or a fluid medium such as high-temperature thermal oil). The solar thermal storage component 3 absorbs heat from the solar energy to heat the heat exchange medium, thereby effectively utilizing the heat from the solar energy.

[0030] The heat exchange component 4 has a first channel (not shown in the figure) and a second channel (not shown in the figure) that are independent of each other and can perform heat exchange. One end of the first channel is connected to one end of the photothermal heat storage component 3, so that the heat exchange medium flowing out of the photothermal heat storage component 3 flows into the first channel. The other end of the first channel is connected to the other end of the photothermal heat storage component 3, so that the heat exchange medium flowing out through the first channel flows into the photothermal heat storage component 3 so that the heat exchange medium circulates between the first channel and the photothermal heat storage component 3. The second channel is respectively connected to the isothermal compression component 1 and the hydraulic constant pressure gas storage component 2, so that the compressed gas flowing out of the hydraulic constant pressure gas storage component 2 or the compressed gas flowing out of the isothermal compression component 1 flows into the second channel to exchange heat with the heat exchange medium in the first channel. Specifically, as Figure 1 As shown, the heat exchange component 4 is a regenerator, and the inlet of the first channel is connected to the outlet of the solar thermal storage component 3, so that the heated heat exchange medium flows into the first channel, and the inlet of the second channel is connected to the outlet of the isothermal compression component 1 and the outlet of the hydraulic constant pressure gas storage component 2 respectively, so that the compressed gas generated by the isothermal compression component 1 and / or the compressed gas in the hydraulic constant pressure gas storage component 2 can flow into the second channel, so that the heat exchange medium in the first channel and the compressed gas in the second channel exchange heat, so that the temperature of the heat exchange medium is reduced and the temperature of the compressed gas is increased, and the outlet of the first channel is connected to the inlet of the solar thermal storage component 3, so that the cooled heat exchange medium flows into the solar thermal storage component 3 for reheating.

[0031] The isothermal compression component 1 can be a multi-stage centrifugal compressor, which uses water to cool the compressor internally and the air between stages and after the last stage to achieve a near-isothermal compression process and obtain compressed air at high pressure and room temperature. It can also be a multi-stage reciprocating compressor, which is achieved by spraying water in the cylinder and inter-stage cooling.

[0032] The regenerative air turbine assembly 5 is connected to the second channel so that the compressed gas after heat exchange in the second channel flows into the regenerative air turbine assembly 5. The regenerative air turbine assembly 5 is used to generate electricity using the compressed gas. Figure 1As shown, the outlet of the second channel is connected to the inlet of the regenerative air turbine assembly 5, so that the heated compressed gas flows into the regenerative air turbine assembly 5 to release energy and generate electricity. Thus, by combining the technologies of the solar thermal storage assembly 3, the heat exchange assembly 4 and the regenerative air turbine assembly 5, the thermal energy in the solar energy is effectively utilized, the power generation efficiency of the regenerative air turbine assembly is improved, and the solar thermal coupled isothermal compressed air multi-mode power generation system 100 forms an efficient, stable, reliable and more adjustable power generation system.

[0033] The solar-thermal coupled isothermal compressed air multi-mode power generation system 100 of an embodiment of the present invention is provided with an isothermal compression component 1, a hydraulic constant pressure gas storage component 2, a solar-thermal heat storage component 3, a heat exchange component 4 and a heat recovery air turbine component 5, thereby coupling the isothermal compression component 1, the hydraulic constant pressure gas storage component 2, the solar-thermal heat storage component 3 and the heat recovery air turbine component 5, thereby increasing the power generation scale of the new clean energy and realizing a completely clean solar-thermal power generation and energy storage system, which can give full play to the advantages of each system, obtain extremely high system comprehensive benefits, and can better adapt to the future development needs of the clean energy power generation and energy storage market.

[0034] In some embodiments, the solar-thermal coupled isothermal compressed air multi-mode power generation system 100 further includes a power supply component 9, which is connected to the isothermal compression component 1 so that the power supply component 9 supplies power to the isothermal compression component 1. Specifically, Figure 1 As shown, the power supply component 9 is a generator, thereby providing electrical energy to the isothermal compression component 1 through the power supply component 9 to ensure the normal operation of the isothermal compression component 1.

[0035] In some embodiments, the hydraulic constant pressure gas storage component 2 includes a water pool 21 and a high-pressure gas storage tank 22. The water pool 21 is used to store liquid, and the high-pressure gas storage tank 22 is a sealed container for storing compressed gas. The top of the high-pressure gas storage tank 22 is connected to the isothermal compression component 1 so that the compressed gas flowing out of the isothermal compression component 1 flows into the high-pressure gas storage tank 22. The bottom of the water pool 21 is connected to the bottom of the high-pressure gas storage tank 22. The hydraulic constant pressure gas storage component 2 has an exhaust state and a gas storage state. In the exhaust state, the water in the water pool 21 flows into the high-pressure gas storage tank 22 so that the compressed gas in the high-pressure gas storage tank 22 flows into the first channel of the heat exchange component 4. In the gas storage state, the liquid in the high-pressure gas storage tank 22 flows into the water pool 21 so that the compressed gas flows into the high-pressure gas storage tank 22. Specifically, as Figure 1As shown, the high-pressure gas storage tank 22 is a steel high-pressure gas storage tank and contains a water-gas mixture. The outlet at the bottom of the water pool 21 is connected to the outlet connected to the bottom of the high-pressure gas storage tank 22, and the outlet at the top of the high-pressure gas storage tank 22 is connected to the inlet of the second channel. In the exhaust state, the high-pressure gas in the high-pressure gas storage tank 22 flows into the second channel from the top of the high-pressure gas storage tank 22. Due to the discharge of the gas in the high-pressure gas storage tank 22, the pressure in the high-pressure gas storage tank 22 will be reduced, so that the water in the water pool 21 can flow into the high-pressure gas storage tank 22. In the gas storage state, the compressed air generated by the isothermal compression assembly 1 flows into the high-pressure gas storage tank 22, thereby squeezing the water in the high-pressure gas storage tank 22 into the water pool 21. As a result, the high-pressure gas storage tank 22 stores compressed gas, and due to the presence of water, the gas in the high-pressure gas storage tank 22 can be completely discharged from the high-pressure gas storage tank 22, and the pressure of the compressed gas in the high-pressure gas storage tank 22 can also be guaranteed to be stable.

[0036] In some embodiments, there are multiple high-pressure gas storage tanks 22, the bottoms of each of the multiple high-pressure gas storage tanks 22 being connected to the bottom of the pool 21, and the tops of each of the multiple high-pressure gas storage tanks 22 being connected to the regenerative air turbine assembly 5. Thus, the number of high-pressure gas storage tanks 22 can be adjusted based on actual needs, making the arrangement of the high-pressure gas storage tanks 22 more reasonable.

[0037] In some embodiments, the solar-thermal coupled isothermal compressed air multi-mode power generation system 100 further includes a high-pressure water pump 23 and a hydraulic motor 24. The two ends of the high-pressure water pump 23 are respectively connected to the water pool 21 and the high-pressure gas storage tank 22, so that in the exhaust state, the high-pressure water pump 23 works to flow the water in the water pool 21 into the high-pressure gas storage tank 22. The two ends of the hydraulic motor 24 are respectively connected to the water pool 21 and the high-pressure gas storage tank 22, so that in the gas storage state, the liquid in the high-pressure gas storage tank 22 flows into the water pool 21, so that the hydraulic motor 24 generates electricity. Specifically, as Figure 1 As shown, the inlet of the high-pressure water pump 23 is connected to the outlet at the bottom of the water pool 21, and the outlet of the high-pressure water pump 23 is connected to the outlet at the bottom of the high-pressure gas storage tank 22. In the exhaust state, the high-pressure water pump 23 transports the water in the water pool 21 to the high-pressure gas storage tank 22 to ensure the pressure in the high-pressure gas storage tank 22. In the gas storage state, the inlet of the hydraulic motor 24 is connected to the outlet at the bottom of the high-pressure gas storage tank 22, and the outlet of the hydraulic motor 24 is connected to the inlet at the bottom of the water pool 21. The compressed gas generated by the isothermal compression assembly 1 flows into the high-pressure gas storage tank 22, thereby squeezing the water in the high-pressure gas storage tank 22 out of the high-pressure gas storage tank 22 and flowing into the water pool 21 through the hydraulic motor 24, so that the water can drive the hydraulic motor 24 to generate power.

[0038] In some embodiments, the solar thermal heat storage assembly 3 includes a plurality of dish-type collectors 31 with tiltable heat collection cavities, a hot tank 32 and a cold tank 33 .

[0039] The dish collector 31 absorbs solar energy for heating, using a fluid medium such as molten salt or high-temperature thermal oil as the heat exchange medium. Specifically, the dish collector 31 features a tiltable heat collection cavity, enabling both decentralized heat collection and centralized heat storage. Sunlight is directed into the cavity dish collector through a parabolic reflector that tracks the sun's trajectory, heating the heat storage medium. The heat collection pipes within the cavity dish collector 31 are stationary, while the cavity's insulated outer shell tilts with the movement of the reflector, constantly aligning the cavity's incident light port with the center of the reflector. This allows for the centralized storage of the heated heat storage medium.

[0040] One end of each dish heat collector 31 is connected to the hot tank 32 so that the heat exchange medium heated by the dish heat collector 31 flows into the hot tank 32 to realize parallel heat collection of multiple dispersed dish heat collectors 31. The hot tank 31 is connected to the first channel of the heat exchange component 4 so that the heat exchange medium flowing out of the hot tank 32 flows into the first channel of the heat exchange component. The cold tank 33 is connected to the first channel of the heat exchange component 4 so that the heat exchange medium flowing out of the first channel flows into the cold tank 33. The other end of each dish heat collector 31 is connected to the cold tank 33 so that the heat exchange medium flowing out of the cold tank 33 flows into the dish heat collector 31. Specifically, Figure 1 As shown, the inlet of each hot tank 32 is connected to the dish heat collector 31, and the outlet of the hot tank 32 is connected to the inlet of the first channel, so that the heat exchange medium heated by each dish heat collector 31 flows into the hot tank 32 for storage. When the heat exchange component 4 is working, the heat exchange medium in the hot tank 32 flows into the first channel, the inlet of the cold tank 33 is connected to the outlet of the first channel, and the outlet of the cold tank 33 is connected to the dish heat collector 31, so that the heat exchange medium after heat exchange and cooling in the first channel flows into the cold tank 33 for storage. When the dish heat collector 31 is working, the heat exchange medium in the cold tank 33 flows into the dish heat collector 31, thereby replenishing the heat exchange medium for the dish heat collector 31, so that the dish heat collector 31 can work uninterruptedly.

[0041] It is worth noting that the number of dish-type collectors 31 is set according to actual conditions and is not limited in the present invention, so as to improve the heating efficiency of the solar thermal storage assembly 3 .

[0042] In some embodiments, the solar thermal storage assembly 3 further includes a first pump 7 and a second pump 8. The two ends of the first pump 7 are respectively connected to the hot tank 32 and the first channel, so that the heat exchange medium in the hot tank 32 flows into the first channel through the first pump 7. The two ends of the second pump 8 are respectively connected to the first channel and the cold tank 33, so that the heat exchange medium in the first channel flows into the cold tank 33 through the second pump 8. Specifically, Figure 1As shown, the first pump 7 is a cold molten salt pump, and the second pump 8 is a hot molten salt pump. The inlet of the first pump 7 is connected to the outlet of the hot tank 32, the outlet of the first pump 7 is connected to the inlet of the first channel, the inlet of the second pump 8 is connected to the outlet of the first channel, and the outlet of the second pump 8 is connected to the inlet of the cold tank 33. Thus, the heat exchange medium circulates between the first channel and the solar thermal storage component 3 through the first pump 7 and the second pump 8.

[0043] In some embodiments, the regenerative air turbine assembly 5 includes an expander 51 and a generator 52. The expander 51 is connected to the second channel of the heat exchange assembly 4 so that the compressed gas flowing out of the first channel flows into the expander 51 to expand the compressed gas. The expander 51 is connected to the generator 52 so that the gas flowing out of the expander 51 flows into the generator 52 to generate electricity. Specifically, Figure 1 As shown, the expander 51 is a centrifugal or axial flow air expander, and the inlet of the expander 51 is connected to the outlet of the second channel, so that the heated compressed gas flows into the expander 51 through the second channel, so that the expander 51 expands the compressed gas, and the outlet of the expander 51 is connected to the generator 52, so that the generator 52 generates electricity from the gas generated by the expander 51.

[0044] In some embodiments, the heat exchange component 4 includes a first heat exchange component 41, a second heat exchange component 42 and a third heat exchange component 43, and the expander 51 includes a first expander 511, a second expander 512 and a third expander 513. The two ends of the first channel of the first heat exchange component 41, the two ends of the first channel of the second heat exchange component 42 and the two ends of the first channel of the third heat exchange component 43 are respectively connected to the two ends of the solar thermal storage component 3. Specifically, as shown in FIG. Figure 1 As shown, the number of heat exchange components 4 can be multiple and they are respectively the first heat exchange component 41, the second heat exchange component 42 and the third heat exchange component 43. The inlet of the first channel of the first heat exchange component 41, the inlet of the first channel of the second heat exchange component 42 and the inlet of the first channel of the third heat exchange component 43 are respectively connected to the outlet of the hot tank 32, and the outlet of the first channel of the first heat exchange component 41, the outlet of the first channel of the second heat exchange component 42 and the outlet of the first channel of the third heat exchange component 43 are respectively connected to the inlet of the cold tank 33, so that the heat exchange medium heated by the photothermal heat storage component 3 flows into the first channel of the first heat exchange component 41, the first channel of the second heat exchange component 42 and the first channel of the third heat exchange component 43 and flows into the cold tank 33 after heat exchange.

[0045] One end of the second channel of the first heat exchange assembly 41 is connected to the isothermal compression assembly 1 and the hydraulic constant pressure gas storage assembly 2, respectively, so that the compressed gas in the isothermal compression assembly 1 and the hydraulic constant pressure gas storage assembly 2 can flow into the second channel of the first heat exchange assembly 41. The other end of the second channel of the first heat exchange assembly 41 is connected to the first expander 511. The two ends of the second channel of the second heat exchange assembly 42 are connected to the first expander 511 and the second expander 512, respectively, so that the gas flowing out of the first expander 511 can flow into the second expander 512 through the second channel of the second heat exchange assembly 42. The two ends of the second channel of the third heat exchange assembly 43 are connected to the second expander 512 and the third expander 513, respectively, so that the gas flowing out of the second expander 512 can flow into the third expander 513 through the second channel of the third heat exchange assembly 43. The third expander 513 is connected to the power generation assembly, so that the gas flowing out of the third expander 513 can flow into the generator 52. As a result, the expander 51 is a multi-stage expander that can expand high-pressure air through preheating and reheating to generate work to drive the generator to generate electricity.

[0046] In some embodiments, the solar-thermal coupled isothermal compressed air multi-mode power generation system 100 further includes an air preheater 6, which includes a third channel (not shown in the figure) and a fourth channel (not shown in the figure) that can independently perform heat exchange. One end of the third channel is connected to the isothermal compression component 1 and the hydraulic constant pressure gas storage component 2, respectively, so that the compressed gas flowing out of the isothermal compression component 1 and the compressed gas flowing out of the hydraulic constant pressure gas storage component 2 flow into the third channel. The other end of the third channel is connected to the second channel of the heat exchange component 4, so that the compressed gas flowing out of the third channel flows into the second channel. The fourth channel is connected to the regenerative air turbine component 5, so that the gas flowing out of the regenerative air turbine component 5 flows into the fourth channel. Specifically, as Figure 1 As shown, the inlet of the third channel is connected to the second channels of the isothermal compression component 1 and the heat exchange component 4 respectively, and the outlet of the third channel is connected to the inlet of the second channel, so that the compressed gas flowing out of the isothermal compression component 1 and the compressed gas flowing out of the hydraulic constant pressure gas storage component 2 flow into the second channel through the third channel, and the outlet of the expander 51 of the regenerative air turbine component 5 is connected to the inlet of the fourth channel. Since the temperature of the gas discharged by the expander 51 is relatively high, the compressed gas in the third channel and the gas in the fourth channel can be heat exchanged, so that the temperature of the compressed gas in the third channel increases and the temperature of the gas in the fourth channel decreases, thereby effectively utilizing the exhaust gas discharged by the expander 51 and reducing the power generation cost of the regenerative air turbine component 5.

[0047] In some embodiments, the solar-thermal coupled isothermal compressed air multi-mode power generation system 100 further includes a first cooling component 11 and a second cooling component 12. The first cooling component 11 is disposed in the isothermal compression component 1 to cool the compressed gas in the isothermal compression component 1. The first cooling component 11 is communicated with the second cooling component 12 so that the compressed gas cooled by the first cooling component 11 flows into the second cooling component 12 for cooling. The second cooling component 12 is communicated with the first channels of the hydraulic constant pressure gas storage component 2 and the heat exchange component 4, respectively, so that the compressed gas flowing out of the second cooling component 12 flows into the hydraulic constant pressure gas storage component 2, or the compressed gas flowing out of the second cooling component 12 flows into the heat exchange component 4. Specifically, as Figure 1 As shown, the first cooling component 11 and the second cooling component 12 are both coolers. The first cooling component 11 is arranged inside the isothermal compression component 1, and the inlet of the second cooler is connected to the outlet of the first cooling component 11. Thus, the compressed gas is cooled by the first cooling component 11 and the second cooling component 12, so that the compressed gas remains at room temperature after flowing out of the isothermal compression component 1, reducing the volume of the compressed gas and preventing the compressed gas in a high temperature state from damaging subsequent components.

[0048] In some embodiments, the hydraulic constant pressure gas storage assembly 2 can be a gas storage salt cavern, an artificial gas storage cavern or a gravity constant pressure gas storage system, etc. Thus, it can be configured according to actual needs, making the configuration of the hydraulic constant pressure gas storage assembly 2 more reasonable.

[0049] In some embodiments, the solar-thermal coupled isothermal compressed air multi-mode power generation system 100 has a first state, a second state, a third state, and a fourth state.

[0050] In the first state, the isothermal compression assembly 1, the regenerative air turbine assembly 5, and the solar thermal storage assembly 3 all operate throughout the day to provide electricity. Specifically, the first state is a solar thermal power station mode, in which the isothermal compression assembly 1, the regenerative air turbine assembly 5, and the solar thermal storage assembly 3 all operate continuously throughout the day. The solar thermal storage assembly 3 collects solar energy and heat during the day, transferring a portion of the heat to the regenerative air turbine assembly 5 via a heat exchange medium. Meanwhile, the remaining heat exchange medium is stored in the heat tank 32 to provide heat at night. This mode can provide continuous power generation 24 hours a day without the involvement of a gas storage system.

[0051] In the second state, the isothermal compression assembly 1 operates at night, the hydraulic constant pressure gas storage assembly 2 stores compressed gas at night and releases it during the day, and the regenerative heat turbine assembly 5 and the solar thermal energy storage assembly 3 operate during the day, allowing the compressed gas in the hydraulic constant pressure gas storage assembly 2 to generate electricity. Specifically, the second state is an energy storage power station mode. The isothermal compression assembly 1 and the hydraulic constant pressure gas storage assembly 2 operate at night, allowing the isothermal compression assembly 1 to operate at night using low-priced electricity from the grid and store compressed air in the hydraulic constant pressure gas storage assembly 2. The regenerative heat turbine assembly 5 and the solar thermal energy storage assembly 3 operate during the day, and the hydraulic constant pressure gas storage assembly 2 releases the compressed air stored in the regenerative heat turbine assembly 5 to generate electricity during the day, thereby obtaining a large profit from the difference in electricity prices.

[0052] In the third state, the isothermal compression component 1 operates at full load at night, the regenerative air turbine component 5 operates all day, the hydraulic constant pressure gas storage component 2 stores gas at night, so that most of the compressed gas generated by the isothermal compression component 1 at night is stored in the hydraulic constant pressure gas storage component 2 and the regenerative air turbine component 5 releases energy from a small part of the compressed gas generated by the isothermal compression component 1 to generate electricity, and the hydraulic constant pressure gas storage component 2 is exhausted during the day so that the compressed gas in the hydraulic constant pressure gas storage component 2 flows into the regenerative air turbine component 5 to enable the regenerative air turbine component 5 to release energy to generate electricity. Specifically, the third state is the solar thermal energy storage power station mode. The isothermal compression component 1 runs at full load at night. A small amount of compressed gas generated by the isothermal compression component 1 flows into the heat recovery air turbine component 5 and consumes a small amount of heat exchange medium in the heat tank 32. Most of the compressed air generated by the isothermal compression component 1 is stored in the hydraulic constant pressure gas storage component 2. During the day, the solar thermal storage is self-built to collect light and heat to heat the heat exchange medium. Most of the heat exchange medium is used to generate electricity, and a small part is stored in the heat tank 32 to release the compressed air stored at night to drive the heat recovery air turbine component 5 to generate electricity. In this mode, the power station system can operate continuously for 24 hours to generate electricity, and can obtain a larger power generation and price difference income.

[0053] In the fourth state, both the isothermal compression assembly 1 and the regenerative air turbine assembly 5 operate throughout the day. The hydraulic constant-pressure gas storage assembly 2 generates and stores gas at night, allowing the majority of the compressed gas produced by the isothermal compression assembly 1 to be stored there. The regenerative air turbine assembly 5 then releases energy from the smaller portion of the compressed gas produced by the isothermal compression assembly 1 to generate electricity. The hydraulic constant-pressure gas storage assembly 2 exhausts gas during the day, allowing the compressed gas within the gas outlet assembly and the compressed gas produced by the isothermal compression assembly 1 to flow into the regenerative air turbine assembly 5 to generate electricity. Specifically, the fourth state represents peaking power station mode. In this mode, the capacity of the isothermal compressor must be over-provisioned, and the solar thermal storage assembly 3 must increase its solar collection area without increasing the amount of heat exchange medium. At least two regenerative air turbine assemblies 5 are deployed. At night, the isothermal compression assembly 1 operates at full capacity, storing compressed gas in the hydraulic constant-pressure gas storage assembly 2 while maintaining the operation of the smaller regenerative air turbine assembly 5. During the day, the solar thermal storage assembly 3 collects solar energy and heat, while the isothermal compression assembly 1 and the hydraulic constant-pressure gas storage assembly 2 simultaneously provide compressed gas. Both regenerative air turbine assemblies 5 operate simultaneously at selected times to generate electricity. This mode allows the power plant system to operate continuously 24 hours a day, maximizing power generation and revenue during periods of high electricity prices.

[0054] Therefore, through the first state, the second state, the third state and the fourth state, the solar-thermal coupled isothermal compressed air multi-mode power generation system 100 has multiple operating modes and can adapt to the price policies of different regions, different seasons and different power grids.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0058] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0060] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A solar-thermal coupled isothermal compressed air multi-mode power generation system, characterized in that: include: an isothermal compression assembly for compressing gas; a hydraulic constant-pressure gas storage assembly, the hydraulic constant-pressure gas storage assembly being in communication with the isothermal compression assembly so as to store compressed gas flowing out of the isothermal compression assembly; A solar thermal heat storage component, wherein a heat exchange medium is stored in the solar thermal heat storage component and the solar thermal heat storage component is used to absorb solar energy to heat the heat exchange medium; a heat exchange component having a first channel and a second channel that are independent of each other and capable of heat exchange, one end of the first channel being connected to one end of the solar thermal storage component so that the heat exchange medium flowing out of the solar thermal storage component flows into the first channel, and the other end of the first channel being connected to the other end of the solar thermal storage component so that the heat exchange medium flowing out through the first channel flows into the solar thermal storage component so that the heat exchange medium circulates between the first channel and the solar thermal storage component, and the second channel being connected to the isothermal compression component and the hydraulic constant pressure gas storage component respectively so that the compressed gas flowing out of the hydraulic constant pressure gas storage component or the compressed gas flowing out of the isothermal compression component flows into the second channel to exchange heat with the heat exchange medium in the first channel; A heat exchanger assembly, wherein the heat exchanger assembly is connected to the second channel so that the compressed gas after heat exchange in the second channel flows into the heat exchanger assembly, and the heat exchanger assembly is used to generate electricity using the compressed gas. The heat exchanger assembly includes an expander and a generator. The expander is connected to the second channel of the heat exchanger assembly so that the compressed gas flowing out through the second channel flows into the expander to expand the compressed gas. The expander is connected to the generator so that the gas flowing out through the expander flows into the generator to generate electricity. The heat exchanger assembly includes a first heat exchanger assembly, a second heat exchanger assembly and a third heat exchanger assembly. The expander includes a first expander, a second expander and a third expander. Each of the two ends of the first channel of the first heat exchanger assembly, the two ends of the first channel of the second heat exchanger assembly and the two ends of the first channel of the third heat exchanger assembly are respectively connected to the photothermal heat storage The two ends of the component are connected, one end of the second channel of the first heat exchange component is connected with the isothermal compression component and the hydraulic constant pressure gas storage component respectively, so that the compressed gas in the isothermal compression component and the hydraulic constant pressure gas storage component flows into the second channel of the first heat exchange component, the other end of the second channel of the first heat exchange component is connected with the first expander, the two ends of the second channel of the second heat exchange component are connected with the first expander and the second expander respectively, so that the gas flowing out of the first expander flows into the second expander through the second channel of the second heat exchange component, the two ends of the second channel of the third heat exchange component are connected with the second expander and the third expander respectively, so that the gas flowing out of the second expander flows into the third expander through the second channel of the third heat exchange component, and the third expander is suitable for connecting with the power generation component so that the gas flowing out of the third expander flows into the generator.

2. The photothermal coupled isothermal compressed air multi-mode power generation system according to claim 1, characterized in that: The hydraulic constant pressure gas storage assembly includes a water pool and a high-pressure gas storage tank. The water pool is used to store liquid. The high-pressure gas storage tank is a closed container and is used to store compressed gas. The top of the high-pressure gas storage tank is connected to the isothermal compression assembly so that the compressed gas flowing out of the isothermal compression assembly flows into the high-pressure gas storage tank. The bottom of the water pool is connected to the bottom of the high-pressure gas storage tank. The hydraulic constant pressure gas storage assembly has an exhaust state and a gas storage state. In the exhaust state, water in the water pool flows into the high-pressure gas storage tank so that the compressed gas in the high-pressure gas storage tank flows into the first channel of the heat exchange assembly. In the gas storage state, the liquid in the high-pressure gas storage tank flows into the water pool so that the compressed gas flows into the high-pressure gas storage tank.

3. The photothermal coupled isothermal compressed air multi-mode power generation system according to claim 1, characterized in that: The hydraulic constant pressure gas storage component is a gas storage salt cavern, an artificial gas storage cavern or a gravity constant pressure gas storage system.

4. The photothermal coupled isothermal compressed air multi-mode power generation system according to claim 2, characterized in that: It also includes a high-pressure water pump and a hydraulic motor, wherein the two ends of the high-pressure water pump are respectively connected to the water pool and the high-pressure gas storage tank, so that in the exhaust state, the high-pressure water pump works to flow the water in the water pool into the high-pressure gas storage tank, and the two ends of the hydraulic motor are respectively connected to the water pool and the high-pressure gas storage tank, so that in the gas storage state, the liquid in the high-pressure gas storage tank flows into the water pool, so that the hydraulic motor generates electricity.

5. The photothermal coupled isothermal compressed air multi-mode power generation system according to claim 1, characterized in that: The solar thermal storage component includes: A plurality of dish-type heat collectors with tiltable heat collection cavities, wherein the dish-type heat collectors are used to absorb the solar energy for heating, and the heat exchange medium is molten salt or high-temperature heat transfer oil; A hot tank and a cold tank, one end of each of the dish-type heat collectors is connected to the hot tank so that the heat exchange medium heated by the dish-type heat collector flows into the hot tank to realize parallel heat collection of multiple dispersed dish-type heat collectors, the hot tank is connected to the first channel of the heat exchange component so that the heat exchange medium flowing out of the hot tank flows into the first channel of the heat exchange component, the cold tank is connected to the first channel of the heat exchange component so that the heat exchange medium flowing out of the first channel flows into the cold tank, and the other end of each of the dish-type heat collectors is connected to the cold tank so that the heat exchange medium flowing out of the cold tank flows into the dish-type heat collector.

6. The photothermal coupled isothermal compressed air multi-mode power generation system according to claim 1, characterized in that: It also includes an air preheater, which includes a third channel and a fourth channel that can independently perform heat exchange with each other, one end of the third channel is respectively connected to the isothermal compression component and the hydraulic constant pressure gas storage component, so that the compressed gas flowing out of the isothermal compression component and the compressed gas flowing out of the hydraulic constant pressure gas storage component flow into the third channel, the other end of the third channel is connected to the second channel of the heat exchange component, so that the compressed gas flowing out of the third channel flows into the second channel, and the fourth channel is connected to the heat recovery air turbine component, so that the gas flowing out of the heat recovery air turbine component flows into the fourth channel.

7. The photothermal coupled isothermal compressed air multi-mode power generation system according to claim 1, characterized in that: It also includes a first cooling component and a second cooling component. The first cooling component is arranged in the isothermal compression component to cool the compressed gas in the isothermal compression component. The first cooling component is connected to the second cooling component so that the compressed gas cooled by the first cooling component flows into the second cooling component for cooling. The second cooling component is respectively connected to the first channels of the hydraulic constant pressure gas storage component and the heat exchange component so that the compressed gas flowing out of the second cooling component flows into the hydraulic constant pressure gas storage component, or the compressed gas flowing out of the second cooling component flows into the heat exchange component.

8. The solar-thermal coupled isothermal compressed air multi-mode power generation system according to claim 1, characterized in that: The photothermal coupled isothermal compressed air multi-mode power generation system further includes a power supply component, which is connected to the isothermal compression component so that the power supply component supplies power to the isothermal compression component.

9. The photothermal coupled isothermal compressed air multi-mode power generation system according to any one of claims 1 to 8, characterized in that: The photothermal coupled isothermal compressed air multi-mode power generation system has a first state, a second state, a third state and a fourth state. In the first state, each of the isothermal compression component, the regenerative air turbine component, and the solar thermal storage component operates all day to provide electrical energy. In the second state, the isothermal compression assembly operates at night, the hydraulic constant pressure gas storage assembly stores gas at night and exhausts gas during the day, and the regenerative air turbine assembly and the solar thermal storage assembly operate during the day, so that the compressed gas in the hydraulic constant pressure gas storage assembly generates electricity. In the third state, the isothermal compression assembly operates at full load at night, the regenerative air turbine assembly operates throughout the day, the hydraulic constant pressure gas storage assembly stores gas at night, so that most of the compressed gas generated by the isothermal compression assembly is stored in the hydraulic constant pressure gas storage assembly at night, and the regenerative air turbine assembly releases energy from a small portion of the compressed gas generated by the isothermal compression assembly to generate electricity, and the hydraulic constant pressure gas storage assembly is exhausted during the day, so that the compressed gas in the hydraulic constant pressure gas storage assembly flows into the regenerative air turbine assembly, so that the regenerative air turbine assembly releases energy to generate electricity. In the fourth state, the isothermal compression component and the regenerative air turbine component both operate throughout the day, the hydraulic constant pressure gas storage component generates stored gas at night, so that most of the compressed gas generated by the isothermal compression component is stored in the hydraulic constant pressure gas storage component at night, and the regenerative air turbine component releases energy from a small portion of the compressed gas generated by the isothermal compression component to generate electricity, and the hydraulic constant pressure gas storage component exhausts gas during the day, so that the compressed gas in the gas outlet component and the compressed gas generated by the isothermal compression component flow into the regenerative air turbine component together to release energy and generate electricity.

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