Groove type photo-thermal power generation system coupled with high-temperature heat pump and electric heater

Abstract

The utility model provides a groove type photo-thermal power generation system coupled with a high-temperature heat pump and an electric heater, a groove type photo-thermal power generation module comprises a heat collection field, a primary power generation module, a primary fused salt heat storage module and a heat conduction oil circulation pipeline, and a high-temperature heat pump module comprises a heat conduction oil-gas heat exchanger and a gas-fused salt heat exchanger. The heat conduction oil-gas heat exchanger is used for transferring heat of high-temperature heat conduction oil in a heat conduction oil circulation pipeline to heat exchange gas of a gas pipeline of the heat conduction oil-gas heat exchanger, and the gas-fused salt heat exchanger is used for further transferring heat of high-temperature heat exchange gas in the gas pipeline of the gas-fused salt heat exchanger to low-temperature fused salt of the second-stage fused salt heat storage module. The fused salt electric heating module comprises a fused salt electric heater, and the fused salt electric heater is used for actively heating low-temperature fused salt in the second-stage fused salt heat storage module in the off-peak electricity period. According to the utility model, the secondary storage and utilization of the abandoned heat of the groove type photo-thermal power generation module can be realized, and the use flexibility and the overall benefit of the groove type photo-thermal power generation system can be improved by matching with peak clipping and valley filling of a power grid.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar thermal power generation, and in particular relates to a trough type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater. Background Art

[0002] Concentrating solar power (CSP) is a new type of clean power generation system that can convert solar energy into thermal energy, and then convert thermal energy into work. Its specific types include trough-type CSP systems. Trough-type CSP systems usually have a solar collector field, inside which a heat-collecting medium can flow. After fully absorbing solar heat, the heat-collecting medium can be transferred to a heat storage system for heat storage treatment, and enter a steam power generation system to generate superheated steam, which then drives a steam turbine generator set to generate electricity.

[0003] However, under existing technologies, conventional trough CSP systems have limited heat storage capacity. When sunlight conditions are sufficient, trough CSP systems often experience heat abandonment. That is, the heat storage system is full and cannot accept more heat, and the heat required for the steam power generation system is also saturated, so some collector fields need to be shut down, resulting in a waste of solar heat. At the same time, when the operating environment of the trough CSP system has a long period of weak light, the heat storage performance and power generation performance of the trough CSP system will be directly affected. In other words, conventional trough CSP systems are greatly affected by the external environment and have poor flexibility in use. When sunlight conditions are insufficient, they cannot efficiently carry out power generation operations, and the overall benefits are unstable. Utility Model Content

[0004] The utility model aims to provide a trough-type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater, so as to solve the technical problems in the existing technology that conventional trough-type solar thermal power generation systems are prone to heat abandonment, have poor flexibility of use, and have low overall benefits.

[0005] To solve the above problems, the technical solution of the present invention is: a trough-type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater, comprising:

[0006] A trough-type solar thermal power generation module, comprising a heat collection field, a primary power generation module, a primary molten salt heat storage module, and a thermal oil circulation pipeline. The trough-type solar thermal power generation module is configured such that the heat collection field absorbs solar heat and enables high-temperature thermal oil to flow through the primary power generation module, the primary molten salt heat storage module, and the thermal oil circulation pipeline, respectively.

[0007] A high-temperature heat pump module, comprising a thermal oil-gas heat exchanger and a gas-molten salt heat exchanger, wherein the thermal oil pipeline of the thermal oil-gas heat exchanger is coupled to the thermal oil circulation pipeline, and the gas pipeline of the thermal oil-gas heat exchanger is coupled to the gas pipeline of the gas-molten salt heat exchanger, and the thermal oil-gas heat exchanger is used to transfer heat from the high-temperature thermal oil in the thermal oil circulation pipeline to the heat exchange gas in its gas pipeline;

[0008] A secondary molten salt heat storage module, comprising a secondary cold molten salt tank and a secondary hot molten salt tank, wherein the molten salt pipeline of the gas-molten salt heat exchanger is coupled with the molten salt pipeline of the secondary molten salt heat storage module, and the gas-molten salt heat exchanger is used to transfer the heat of the high-temperature heat exchange gas in its gas pipeline to the low-temperature molten salt in the secondary molten salt heat storage module;

[0009] A molten salt electric heating module, comprising a molten salt electric heater, coupled to the molten salt pipeline of the secondary molten salt heat storage module, and configured to actively heat the low-temperature molten salt in the secondary molten salt heat storage module during off-peak hours.

[0010] Preferably, the high-temperature heat pump module further includes a compressor and an expander, the air inlet of the compressor is connected to the gas pipeline outlet of the thermal oil-gas heat exchanger, and the air outlet of the compressor is connected to the gas pipeline inlet of the gas-molten salt heat exchanger, and the compressor is used to compress the heat exchange gas in the gas pipeline of the high-temperature heat pump module;

[0011] The air inlet of the expander is connected to the gas pipeline outlet of the gas-molten salt heat exchanger, and the air outlet of the expander is connected to the gas pipeline inlet of the thermal oil-gas heat exchanger. The expander is used to depressurize the heat exchange gas compressed by the compressor in the gas pipeline of the high-temperature heat pump module.

[0012] Preferably, the temperature range of the heat exchange gas heated by the thermal oil-gas heat exchanger is limited to 300°C-390°C, and the temperature range of the heat exchange gas compressed by the compressor in the gas pipeline of the gas-molten salt heat exchanger is limited to 500°C-600°C.

[0013] Preferably, a cold molten salt pump is provided in the secondary cold molten salt tank, the outlet of the cold molten salt pump is connected to the molten salt pipeline inlet of the gas-molten salt heat exchanger and the inlet of the molten salt electric heater through a molten salt pipeline, the molten salt pipeline outlet of the gas-molten salt heat exchanger and the outlet of the molten salt electric heater are connected to the secondary hot molten salt tank through a molten salt pipeline, and the cold molten salt pump is used to extract the low-temperature molten salt in the secondary cold molten salt tank and transfer it to the secondary hot molten salt tank through the gas-molten salt heat exchanger and / or the molten salt electric heater.

[0014] Preferably, the temperature of the molten salt passing through the gas-molten salt heat exchanger is limited to be adjusted from 280°C-300°C to 500°C-600°C.

[0015] Preferably, a secondary power generation module is further included, the secondary power generation module including a molten salt-water heat exchanger, a secondary steam turbine and a secondary generator, a hot molten salt pump is provided in the secondary hot molten salt tank, the outlet of the hot molten salt pump is connected to the molten salt pipeline inlet of the molten salt-water heat exchanger through a molten salt pipeline, the molten salt pipeline outlet of the molten salt-water heat exchanger is connected to the secondary cold molten salt tank through a molten salt pipeline, and the hot molten salt pump is used to extract high-temperature molten salt in the secondary hot molten salt tank and transfer it to the secondary cold molten salt tank through the molten salt-water heat exchanger;

[0016] The steam pipeline inlet of the molten salt-water heat exchanger is connected to the water supply end, the steam pipeline outlet of the molten salt-water heat exchanger is connected to the secondary steam turbine, the secondary steam turbine is electrically connected to the secondary generator, and the molten salt-water heat exchanger is used to generate superheated steam and drive the secondary steam turbine and the secondary generator to generate electricity.

[0017] Preferably, the first-stage power generation module includes a thermal oil-water heat exchanger, a first-stage steam turbine and a first-stage generator, the thermal oil pipeline inlet of the thermal oil-water heat exchanger is connected to the thermal oil pipeline outlet of the thermal collecting field, and the thermal oil pipeline outlet of the thermal oil-water heat exchanger is connected to the thermal oil storage tank;

[0018] The steam pipeline inlet of the thermal oil-water heat exchanger is connected to the water supply end, the steam pipeline outlet of the thermal oil-water heat exchanger is connected to the first-stage steam turbine, the first-stage steam turbine is electrically connected to the first-stage generator, and the thermal oil-water heat exchanger is used to generate superheated steam and drive the first-stage steam turbine and the first-stage generator to generate electricity.

[0019] Preferably, the primary molten salt heat storage module includes a thermal oil-molten salt heat exchanger, a primary cold molten salt tank and a primary hot molten salt tank, the thermal oil pipeline inlet of the thermal oil-molten salt heat exchanger is connected to the thermal oil pipeline outlet of the thermal collecting field, and the thermal oil pipeline outlet of the thermal oil-molten salt heat exchanger is connected to the thermal oil storage tank;

[0020] The molten salt pipeline inlet of the thermal oil-molten salt heat exchanger is connected to the first-level cold molten salt tank, and the molten salt pipeline outlet of the thermal oil-molten salt heat exchanger is connected to the first-level hot molten salt tank. The thermal oil-molten salt heat exchanger is used to heat the low-temperature molten salt transferred from the first-level cold molten salt tank to the first-level hot molten salt tank through the heat of the high-temperature thermal oil in its thermal oil pipeline.

[0021] Preferably, one end of the heat transfer oil circulation pipeline is connected to the heat transfer oil pipeline outlet of the heat collection field, and the other end of the heat transfer oil circulation pipeline extends to be connected to the heat transfer oil storage tank.

[0022] Preferably, the trough-type solar thermal power generation module is also provided with a thermal oil pump, the inlet of the thermal oil pump is connected to the thermal oil storage tank through a thermal oil pipeline, and the outlet of the thermal oil pump is connected to the thermal oil pipeline inlet of the thermal collection field through a thermal oil pipeline. The thermal oil pump is used to drive the thermal oil to circulate in the thermal collection field, the first-level power generation module, the first-level molten salt heat storage module and the thermal oil circulation pipeline.

[0023] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0024] (1) The utility model provides a trough-type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater, which is provided with a trough-type solar thermal power generation module, a high-temperature heat pump module and a secondary molten salt heat storage module. When the trough-type solar thermal power generation module generates waste heat under sufficient external environmental light conditions, the high-temperature heat pump module can transfer the excess heat of the heat collecting medium in the heat collecting field to the heat exchange air, and then exchange heat with the high-temperature heat exchange air and the low-temperature molten salt in the secondary molten salt heat storage module to realize the secondary energy storage operation of the waste heat, effectively improve the overall heat storage capacity of the trough-type solar thermal power generation system, and reduce the waste of solar heat.

[0025] (2) The utility model provides a trough-type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater, and is also provided with a molten salt electric heating module. When the amount of heat abandoned by the trough-type solar thermal power generation module is limited and the power grid is in a valley power period, the trough-type solar thermal power generation system can heat the low-temperature molten salt of the secondary molten salt heat storage module by itself through the molten salt electric heating module and store heat. Furthermore, a secondary power generation module is also provided. When the power grid is in a peak power period, the trough-type solar thermal power generation system can further use the high-temperature molten salt through the secondary power generation module to realize power generation operations, thereby effectively improving the flexible heat storage power generation efficiency and overall comprehensive benefits of the trough-type solar thermal power generation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The utility model provides a structural schematic diagram of a trough-type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater.

[0027] Explanation of the accompanying symbols: 1: solar collector field; 2: thermal oil-water heat exchanger; 3: thermal oil-molten salt heat exchanger; 4: thermal oil pump; 5: thermal oil storage tank; 6: first-stage steam turbine; 7: first-stage generator; 8: first-stage hot molten salt tank; 9: first-stage cold molten salt tank; 10: thermal oil-gas heat exchanger; 11: compressor; 12: gas-molten salt heat exchanger; 13: expander; 14: molten salt electric heater; 15: molten salt-water heat exchanger; 16: cold molten salt pump; 17: second-stage cold molten salt tank; 18: hot molten salt pump; 19: second-stage hot molten salt tank; 20: second-stage steam turbine; 21: second-stage generator. DETAILED DESCRIPTION

[0028] The following is a detailed description of a trough-type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater, as proposed by the present invention, with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0029] See Figure 1 This embodiment provides a trough type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater, which is used to fully collect and utilize solar heat, and to improve the flexibility of use and overall comprehensive benefits of the trough type solar thermal power generation system.

[0030] The trough type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater provided in this embodiment mainly includes a trough type solar thermal power generation module, a high-temperature heat pump module, a secondary molten salt heat storage module, a molten salt electric heating module and a secondary power generation module.

[0031] Among them, the trough type solar thermal power generation module includes a solar collector field 1, a first-level power generation module, a first-level molten salt heat storage module and a thermal oil circulation pipeline. The heat collection medium used in the solar collector field 1 is thermal oil. After the thermal oil fully absorbs solar heat in the solar collector field 1, the temperature of the thermal oil can rise from 290°C to 393°C. Subsequently, the high-temperature thermal oil flows into the first-level power generation module, the first-level molten salt heat storage module and the thermal oil circulation pipeline respectively. The first-level power generation module is used to generate electricity with the help of the heat of the high-temperature thermal oil, and the first-level molten salt heat storage module is used to store the heat of the high-temperature thermal oil. Under meteorological conditions with sufficient external sunlight, when the heat required for power generation by the first-level power generation module and the heat that can be stored in the first-level molten salt heat storage module are saturated, the excess heat collected in the solar collector field 1 can be transmitted to the high-temperature heat pump module by the thermal oil through the thermal oil circulation pipeline.

[0032] The high-temperature heat pump module includes a thermal oil-gas heat exchanger 10 and a gas-molten salt heat exchanger 12. The thermal oil-gas heat exchanger 10 is provided with a thermal oil pipeline and a gas pipeline. The thermal oil-gas heat exchanger 10 is configured so that when high-temperature thermal oil flows through the thermal oil pipeline of the thermal oil-gas heat exchanger 10, the high-temperature thermal oil can exchange heat with the gas flowing in the gas pipeline of the thermal oil-gas heat exchanger 10. That is, the heat of the high-temperature thermal oil can be transferred to the heat exchange gas through the thermal oil-gas heat exchanger 10. In this embodiment, the thermal oil pipeline of the thermal oil-gas heat exchanger 10 is connected to the thermal oil circulation pipeline of the trough-type solar thermal power generation module. That is, the waste heat generated by the trough-type solar thermal power generation module can be transferred to the high-temperature heat pump module via the thermal oil-gas heat exchanger 10.

[0033] Similarly, the gas-molten salt heat exchanger 12 is provided with a gas pipeline and a molten salt pipeline. The gas-molten salt heat exchanger 12 is configured so that when the high-temperature heat exchange gas flows through the gas pipeline of the gas-molten salt heat exchanger 12, the high-temperature heat exchange gas can achieve heat exchange with the molten salt flowing in the molten salt pipeline of the gas-molten salt heat exchanger 12, that is, the heat of the high-temperature heat exchange gas can be further transferred to the molten salt through the gas-molten salt heat exchanger 12. In this embodiment, the gas pipeline of the gas-molten salt heat exchanger 12 is connected to the gas pipeline of the thermal oil-gas heat exchanger 10, and the molten salt pipeline of the gas-molten salt heat exchanger 12 is further connected to the molten salt pipeline of the secondary molten salt heat storage module. That is, the waste heat generated by the trough-type solar thermal power generation module is transferred to the secondary molten salt heat storage module after secondary transfer through the thermal oil-gas heat exchanger 10 and the gas-molten salt heat exchanger 12.

[0034] The secondary molten salt heat storage module includes a secondary cold molten salt tank 17 and a secondary hot molten salt tank 19. The secondary cold molten salt tank 17 is used to store low-temperature molten salt, and the secondary hot molten salt tank 19 is used to store high-temperature molten salt. The secondary molten salt heat storage module is configured so that the low-temperature molten salt in the secondary cold molten salt tank 17 flows through the molten salt channel of the gas-molten salt heat exchanger 12, and realizes heat exchange operation with the high-temperature heat exchange gas in the gas channel of the gas-molten salt heat exchanger 12 to generate high-temperature molten salt, and flows to the secondary hot molten salt tank 19 for storage, thereby realizing the secondary energy storage operation of the heat discarded by the trough type solar thermal power generation module and improving the overall heat storage capacity of the trough type solar thermal power generation system.

[0035] The molten salt electric heating module includes a molten salt electric heater 14, the inlet of the molten salt electric heater 14 is connected to the secondary cold molten salt tank 17, and the outlet of the molten salt electric heater 14 is connected to the secondary hot molten salt tank 19. The molten salt electric heater 14 is configured so that when the molten salt electric heater 14 is powered on and started, the low-temperature molten salt in the secondary cold molten salt tank 17 flows through the molten salt electric heater 14. The molten salt electric heater 14 can actively heat the low-temperature molten salt to form high-temperature molten salt, and circulate it to the secondary hot molten salt tank 19 for storage.

[0036] The secondary power generation module includes a molten salt-water heat exchanger 15, a secondary steam turbine 20 and a secondary generator 21. The molten salt-water heat exchanger 15 is provided with a molten salt pipeline and a steam pipeline. The molten salt pipeline inlet of the molten salt-water heat exchanger 15 is connected to the secondary hot molten salt tank 19, the molten salt pipeline outlet of the molten salt-water heat exchanger 15 is connected to the secondary cold molten salt tank 17, the steam pipeline inlet of the molten salt-water heat exchanger 15 is connected to the water supply end, the steam pipeline outlet of the molten salt-water heat exchanger 15 is connected to the secondary steam turbine 20, and the secondary steam turbine 20 is connected to the secondary generator 21. 1 is electrically connected. The secondary power generation module is configured such that when the high-temperature molten salt in the secondary molten salt tank 19 flows through the molten salt pipeline of the molten salt-water heat exchanger 15, the high-temperature molten salt can achieve heat exchange with the water flowing in the steam pipeline of the molten salt-water heat exchanger 15. That is, the heat of the high-temperature molten salt can be transferred to the water through the molten salt-water heat exchanger 15, thereby superheating the water in the steam pipeline to generate high-pressure steam of 550°C and 14 MPa. The high-pressure steam drives the secondary steam turbine 20 to rotate, and finally generates electricity through the secondary generator 21.

[0037] In summary, this embodiment provides a trough-type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater. During normal use, the trough-type solar thermal power generation module can meet the absorption and storage operations of solar heat, as well as the power generation operation through solar heat. When the external environment of the trough-type solar thermal power generation system is sufficiently illuminated, the waste heat generated by the excessive absorption of solar heat by the trough-type solar thermal power generation module can first be transferred once through the thermal oil-gas heat exchanger 10, that is, the heat of the high-temperature thermal oil is transferred to the heat exchange gas. Subsequently, the secondary heat transfer can be achieved through the gas-molten salt heat exchanger 12, that is, the heat of the high-temperature heat exchange gas is transferred to the molten salt, and heat storage is achieved in the secondary molten salt tank 19. Therefore, without changing the structure of the first-level power generation module and the first-level molten salt heat storage module of the original trough-type solar thermal power generation module, this embodiment can effectively improve the overall energy storage capacity of the trough-type solar thermal power generation system and avoid the waste of solar energy.

[0038] At the same time, the present embodiment provides a trough type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater, which is also provided with a molten salt electric heating module and a secondary power generation module, thereby realizing that the trough type solar thermal power generation system can cooperate with the power grid for peak regulation. When the power grid is in a low power consumption valley, the molten salt electric heater 14 can be powered on to actively heat the low-temperature molten salt in the secondary cold molten salt tank 17 from 280°C-300°C to 500°C-600°C, and the high-temperature molten salt is stored in the secondary hot molten salt tank 19. When the power grid is in a peak power consumption valley, the high-temperature molten salt in the secondary hot molten salt tank 19 is enabled to pass through the molten salt-water heat exchanger 15 to transfer heat to the water body, generating superheated steam, which enters the steam turbine generator set for power generation, and the molten salt temperature after passing through the molten salt-water heat exchanger 15 drops to 280°C-300°C and is sent back to the secondary cold molten salt tank 17 for storage. Therefore, the present embodiment can effectively improve the utilization rate and flexible applicability of the trough type solar thermal power generation system, as well as improve the overall comprehensive benefits of the trough type solar thermal power generation system.

[0039] The specific structure and function of a trough-type solar thermal power generation system coupled with a high-temperature heat pump and an electric heater provided in this embodiment will be described in further detail below:

[0040] Preferably, in this embodiment, the high-temperature heat pump module also includes a compressor 11 and an expander 13. The air inlet of the compressor 11 is connected to the gas pipeline outlet of the thermal oil-gas heat exchanger 10, and the air outlet of the compressor 11 is connected to the gas pipeline inlet of the gas-molten salt heat exchanger 12. In this embodiment, when the high-temperature thermal oil flows through the thermal oil pipeline of the thermal oil-gas heat exchanger 10, the thermal oil temperature drops from 393°C to about 290°C, and the heat exchange gas rises from 280°C to 300°C-390°C. Then, the high-temperature heat exchange gas enters the compressor 11 for gas compression operation to further increase the temperature of the heat exchange gas. The temperature range of the high-temperature and high-pressure heat exchange gas after the gas compression operation of the compressor 11 is 500°C-600°C. Finally, the high-temperature and high-pressure heat exchange gas enters the gas pipeline of the gas-molten salt heat exchanger 12.

[0041] The air inlet of the expander 13 is connected to the gas pipeline outlet of the gas-molten salt heat exchanger 12, and the air outlet of the expander 13 is connected to the gas pipeline inlet of the thermal oil-gas heat exchanger 10. In this embodiment, when the high-temperature and high-pressure heat exchange gas flows through the gas pipeline of the gas-molten salt heat exchanger 12, the temperature of the high-temperature and high-pressure heat exchange gas drops to about 295°C, and the molten salt is heated from 292°C to 565°C. Then, the low-temperature and high-pressure heat exchange gas enters the expander 13 for gas pressure relief operation, so that the heat exchange gas pressure returns to normal, and the temperature of the heat exchange gas after the gas pressure relief operation of the expander 13 drops to about 280°C. Finally, the heat exchange gas re-enters the gas pipeline of the thermal oil-gas heat exchanger 10, circulates continuously in the high-temperature heat pump module, repeatedly absorbs the heat of the high-temperature thermal oil, and transfers it to the low-temperature molten salt, realizing the heat transfer function.

[0042] Preferably, in this embodiment, a cold molten salt pump 16 is provided in the secondary cold molten salt tank 17, and the outlet of the cold molten salt pump 16 is connected to the molten salt pipeline inlet of the gas-molten salt heat exchanger 12 and the inlet of the molten salt electric heater 14 through the molten salt pipeline, and the molten salt pipeline outlet of the gas-molten salt heat exchanger 12 and the outlet of the molten salt electric heater 14 are connected to the secondary hot molten salt tank 19 through the molten salt pipeline, respectively. The cold molten salt pump 16 is used to extract the low-temperature molten salt in the secondary cold molten salt tank 17 and transfer it to the secondary hot molten salt tank 19 through the gas-molten salt heat exchanger 12 and / or the molten salt electric heater 14, thereby realizing the fully automatic circulation and heating function of the low-temperature molten salt.

[0043] Preferably, in this embodiment, a molten salt pump is provided in the secondary hot molten salt tank 19, and the outlet of the hot molten salt pump is connected to the molten salt pipeline inlet of the molten salt-water heat exchanger 15 through a molten salt pipeline, and the molten salt pipeline outlet of the molten salt-water heat exchanger 15 is connected to the secondary cold molten salt tank 17 through a molten salt pipeline. The hot molten salt pump is used to extract the high-temperature molten salt in the secondary hot molten salt tank 19 and transfer it to the secondary cold molten salt tank 17 through the molten salt-water heat exchanger 15, thereby realizing the fully automatic circulation, heat release and power generation functions of the high-temperature molten salt.

[0044] Similarly, in this embodiment, the first-level power generation module includes a thermal oil-water heat exchanger 2, a first-level steam turbine 6 and a first-level generator 7. The thermal oil-water heat exchanger 2 is provided with a thermal oil pipeline and a steam pipeline. The thermal oil pipeline inlet of the thermal oil-water heat exchanger 2 is connected to the thermal oil pipeline outlet of the heat collecting field, the thermal oil pipeline outlet of the thermal oil-water heat exchanger 2 is connected to the thermal oil storage tank 5, the steam pipeline inlet of the thermal oil-water heat exchanger 2 is connected to the water supply end, the steam pipeline outlet of the thermal oil-water heat exchanger 2 is connected to the first-level steam turbine 6, and the first-level steam turbine 6 It is electrically connected to the first-stage generator 7, and the first-stage power generation module is configured so that when the high-temperature thermal oil in the collector field flows through the thermal oil pipeline of the thermal oil-water heat exchanger 2, the high-temperature thermal oil can realize heat exchange operation with the water flowing in the steam pipeline of the thermal oil-water heat exchanger 2, that is, the heat of the high-temperature thermal oil can be transferred to the water through the thermal oil-water heat exchanger 2, thereby causing the water in the steam pipeline to be superheated to generate 550°C, 14MPag high-pressure steam, and the high-pressure steam drives the first-stage steam turbine 6 to rotate, and finally generates electricity through the first-stage generator 7.

[0045] Preferably, in this embodiment, the first-level molten salt heat storage module includes a thermal oil-molten salt heat exchanger 3, a first-level cold molten salt tank 9 and a first-level hot molten salt tank 8. The thermal oil-molten salt heat exchanger 3 is provided with a thermal oil pipeline and a molten salt pipeline. The thermal oil-molten salt heat exchanger 3 is configured so that when the high-temperature thermal oil flows through the thermal oil pipeline of the thermal oil-molten salt heat exchanger 3, the high-temperature thermal oil can realize heat exchange operation with the molten salt flowing in the molten salt pipeline of the thermal oil-molten salt heat exchanger 3, that is, the heat of the high-temperature thermal oil can be further transferred to the molten salt through the thermal oil-molten salt heat exchanger 3. In this embodiment, the thermal oil pipeline inlet of the thermal oil-molten salt heat exchanger 3 is connected to the thermal oil pipeline outlet of the thermal collection field, the thermal oil pipeline outlet of the thermal oil-molten salt heat exchanger 3 is connected to the thermal oil storage tank 5, the molten salt pipeline inlet of the thermal oil-molten salt heat exchanger 3 is connected to the first-level cold molten salt tank 9, and the molten salt pipeline outlet of the thermal oil-molten salt heat exchanger 3 is connected to the first-level hot molten salt tank 8. That is, the solar heat collected by the thermal collection field 1 can be used to heat the low-temperature molten salt through the thermal oil-molten salt heat exchanger 3 to form high-temperature molten salt, which is then stored in the first-level hot molten salt tank 8. Among them, the fully automatic circulation function of the low-temperature molten salt in the first-level molten salt heat storage module can be achieved by referring to the provision of a molten salt pump in the second-level molten salt heat storage module, or by adopting other technical solutions, which will not be fully described in this embodiment.

[0046] Preferably, in this embodiment, one end of the heat transfer oil circulation pipeline is connected to the heat transfer oil pipeline outlet of the solar field, and the other end of the heat transfer oil circulation pipeline extends to be connected to the heat transfer oil storage tank 5.

[0047] Furthermore, in this embodiment, a thermal oil pump 4 is also provided in the trough type solar thermal power generation module. The inlet of the thermal oil pump 4 is connected to the thermal oil storage tank 5 through the thermal oil pipeline, and the outlet of the thermal oil pump 4 is connected to the thermal oil pipeline inlet of the solar collector field through the thermal oil pipeline. The thermal oil pump 4 can be used to drive the thermal oil to circulate in the solar collector field, the primary power generation module, the molten salt heat storage module and the thermal oil circulation pipeline, thereby fully realizing the primary absorption, storage and power generation operations of solar energy and the secondary storage operation of the abandoned heat of the trough type solar thermal power generation module.

[0048] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they will still fall within the scope of protection of the present invention.

Claims

1. A trough solar thermal power generation system coupled with a high-temperature heat pump and an electric heater, characterized in that: include: A trough-type solar thermal power generation module, comprising a heat collection field, a primary power generation module, a primary molten salt heat storage module, and a thermal oil circulation pipeline. The trough-type solar thermal power generation module is configured such that the heat collection field absorbs solar heat and enables high-temperature thermal oil to flow through the primary power generation module, the primary molten salt heat storage module, and the thermal oil circulation pipeline, respectively. A high-temperature heat pump module, comprising a thermal oil-gas heat exchanger and a gas-molten salt heat exchanger, wherein the thermal oil pipeline of the thermal oil-gas heat exchanger is coupled to the thermal oil circulation pipeline, and the gas pipeline of the thermal oil-gas heat exchanger is coupled to the gas pipeline of the gas-molten salt heat exchanger, and the thermal oil-gas heat exchanger is used to transfer heat from the high-temperature thermal oil in the thermal oil circulation pipeline to the heat exchange gas in its gas pipeline; A secondary molten salt heat storage module, comprising a secondary cold molten salt tank and a secondary hot molten salt tank, wherein the molten salt pipeline of the gas-molten salt heat exchanger is coupled with the molten salt pipeline of the secondary molten salt heat storage module, and the gas-molten salt heat exchanger is used to transfer the heat of the high-temperature heat exchange gas in its gas pipeline to the low-temperature molten salt in the secondary molten salt heat storage module; A molten salt electric heating module, comprising a molten salt electric heater, coupled to the molten salt pipeline of the secondary molten salt heat storage module, and configured to actively heat the low-temperature molten salt in the secondary molten salt heat storage module during off-peak hours.

2. The trough type solar thermal power generation system coupled with a high temperature heat pump and an electric heater according to claim 1, characterized in that: The high-temperature heat pump module also includes a compressor and an expander, the air inlet of the compressor is connected to the gas pipeline outlet of the thermal oil-gas heat exchanger, and the air outlet of the compressor is connected to the gas pipeline inlet of the gas-molten salt heat exchanger, and the compressor is used to compress the heat exchange gas in the gas pipeline of the high-temperature heat pump module; The air inlet of the expander is connected to the gas pipeline outlet of the gas-molten salt heat exchanger, and the air outlet of the expander is connected to the gas pipeline inlet of the thermal oil-gas heat exchanger. The expander is used to depressurize the heat exchange gas compressed by the compressor in the gas pipeline of the high-temperature heat pump module.

3. The trough solar thermal power generation system coupled with a high-temperature heat pump and an electric heater according to claim 2, characterized in that: The temperature range of the heat exchange gas heated by the thermal oil-gas heat exchanger is limited to 300°C-390°C, and the temperature range of the heat exchange gas compressed by the compressor in the gas pipeline of the gas-molten salt heat exchanger is limited to 500°C-600°C.

4. The trough type solar thermal power generation system coupled with a high temperature heat pump and an electric heater according to claim 1, characterized in that: A cold molten salt pump is provided in the secondary cold molten salt tank, and the outlet of the cold molten salt pump is connected to the molten salt pipeline inlet of the gas-molten salt heat exchanger and the inlet of the molten salt electric heater through a molten salt pipeline, respectively. The molten salt pipeline outlet of the gas-molten salt heat exchanger and the outlet of the molten salt electric heater are connected to the secondary hot molten salt tank through a molten salt pipeline, respectively. The cold molten salt pump is used to extract low-temperature molten salt in the secondary cold molten salt tank and transfer it to the secondary hot molten salt tank through the gas-molten salt heat exchanger and / or the molten salt electric heater.

5. The trough solar thermal power generation system coupled with a high-temperature heat pump and an electric heater according to claim 4, characterized in that: The temperature of the molten salt passing through the gas-molten salt heat exchanger is limited to be adjusted from 280°C to 300°C to 500°C to 600°C.

6. The trough solar thermal power generation system coupled with a high-temperature heat pump and an electric heater according to claim 4, characterized in that: It also includes a secondary power generation module, which includes a molten salt-water heat exchanger, a secondary steam turbine and a secondary generator. A hot molten salt pump is provided in the secondary hot molten salt tank. The outlet of the hot molten salt pump is connected to the molten salt pipeline inlet of the molten salt-water heat exchanger through a molten salt pipeline. The molten salt pipeline outlet of the molten salt-water heat exchanger is connected to the secondary cold molten salt tank through a molten salt pipeline. The hot molten salt pump is used to extract high-temperature molten salt in the secondary hot molten salt tank and transfer it to the secondary cold molten salt tank through the molten salt-water heat exchanger. The steam pipeline inlet of the molten salt-water heat exchanger is connected to the water supply end, the steam pipeline outlet of the molten salt-water heat exchanger is connected to the secondary steam turbine, the secondary steam turbine is electrically connected to the secondary generator, and the molten salt-water heat exchanger is used to generate superheated steam and drive the secondary steam turbine and the secondary generator to generate electricity.

7. The trough solar thermal power generation system coupled with a high-temperature heat pump and an electric heater according to claim 1, wherein: The first-stage power generation module includes a thermal oil-water heat exchanger, a first-stage steam turbine and a first-stage generator. The thermal oil pipeline inlet of the thermal oil-water heat exchanger is connected to the thermal oil pipeline outlet of the heat collecting field, and the thermal oil pipeline outlet of the thermal oil-water heat exchanger is connected to the thermal oil storage tank. The steam pipeline inlet of the thermal oil-water heat exchanger is connected to the water supply end, the steam pipeline outlet of the thermal oil-water heat exchanger is connected to the first-stage steam turbine, the first-stage steam turbine is electrically connected to the first-stage generator, and the thermal oil-water heat exchanger is used to generate superheated steam and drive the first-stage steam turbine and the first-stage generator to generate electricity.

8. The trough solar thermal power generation system coupled with a high-temperature heat pump and an electric heater according to claim 1, wherein: The first-level molten salt heat storage module includes a thermal oil-molten salt heat exchanger, a first-level cold molten salt tank and a first-level hot molten salt tank. The thermal oil pipeline inlet of the thermal oil-molten salt heat exchanger is connected to the thermal oil pipeline outlet of the heat collection field, and the thermal oil pipeline outlet of the thermal oil-molten salt heat exchanger is connected to the thermal oil storage tank; The molten salt pipeline inlet of the thermal oil-molten salt heat exchanger is connected to the first-level cold molten salt tank, and the molten salt pipeline outlet of the thermal oil-molten salt heat exchanger is connected to the first-level hot molten salt tank. The thermal oil-molten salt heat exchanger is used to heat the low-temperature molten salt transferred from the first-level cold molten salt tank to the first-level hot molten salt tank through the heat of the high-temperature thermal oil in its thermal oil pipeline.

9. The trough solar thermal power generation system coupled with a high-temperature heat pump and an electric heater according to claim 1, wherein: One end of the heat transfer oil circulation pipeline is connected to the heat transfer oil pipeline outlet of the heat collection field, and the other end of the heat transfer oil circulation pipeline extends to be connected to the heat transfer oil storage tank.

10. The trough solar thermal power generation system coupled with a high-temperature heat pump and an electric heater according to any one of claims 7 to 9, characterized in that: The trough-type solar thermal power generation module is also provided with a thermal oil pump, the inlet of the thermal oil pump is connected to the thermal oil storage tank through a thermal oil pipeline, and the outlet of the thermal oil pump is connected to the thermal oil pipeline inlet of the thermal collection field through a thermal oil pipeline. The thermal oil pump is used to drive the thermal oil to circulate in the thermal collection field, the first-level power generation module, the first-level molten salt heat storage module and the thermal oil circulation pipeline.

Images