A power generation system based on geothermal and organic Rankine cycle coupled energy storage

Abstract

This disclosure relates to a power generation system based on geothermal energy and organic Rankine cycle (ORC) coupled energy storage. The system includes a geothermal module, an ORC power generation module, a heat pump energy storage module, a heat exchange module, and a generator unit heat engine module. Specifically: the geothermal module is connected to the ORC power generation module via a first heat exchanger; the output of the ORC power generation module is connected to the input of the heat pump energy storage module; the ORC power generation module supplies electrical energy to the heat pump energy storage module; the heat pump energy storage module is connected to the geothermal module via a low-temperature heat exchanger; the heat pump energy storage module is connected to the generator unit heat engine module via the heat exchange module; and the generator unit heat engine module utilizes the heat from the heat pump energy storage module to convert it into electrical energy. This solution improves the collection efficiency and utilization rate of geothermal energy.

Description

Technical Field

[0001] This disclosure relates to the field of clean energy power generation technology, and in particular to a power generation system based on geothermal and organic Rankine cycle coupled energy storage. Background Technology

[0002] Among related technologies, geothermal resources have the characteristics of large reserves, wide distribution, cleanliness and environmental protection, good stability and high utilization coefficient. They are a realistic and competitive renewable energy source. Existing geothermal energy utilization devices can collect geothermal energy through heat transfer structures, but due to their limited collection effect and utilization efficiency, they cannot fully meet the demand for conventional energy. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this disclosure provides a power generation system based on geothermal and organic Rankine cycle coupled energy storage.

[0004] According to a first aspect of the present disclosure, a power generation system based on geothermal and organic Rankine cycle coupled energy storage is provided, comprising:

[0005] It includes geothermal modules, Organic Rankine Cycle (ORC) power generation modules, heat pump energy storage modules, heat exchange modules, and unit heat engine modules, among which:

[0006] The geothermal module is connected to the ORC power generation module through a first heat exchanger;

[0007] The output terminal of the ORC power generation module is connected to the input terminal of the heat pump energy storage module; the ORC power generation module is used to input electrical energy into the heat pump energy storage module.

[0008] The heat pump energy storage module is connected to the geothermal module through a low-temperature heat exchanger;

[0009] The heat pump energy storage module is connected to the unit's heat engine module through the heat exchange module; the unit's heat engine module is used to convert the heat from the heat pump energy storage module into electrical energy using the heat exchange module.

[0010] In some embodiments of this disclosure, the geothermal module includes geothermal pipes, and the ORC power generation module includes a first expander, a first condenser, and a first working fluid pump, wherein:

[0011] The geothermal pipe is connected to the shell side of the first heat exchanger via a circulation pipeline;

[0012] The outlet of the first expander is connected in sequence to the tube side of the first condenser, the first working fluid pump, the first heat exchanger, and the inlet of the first expander.

[0013] The first expander is connected to the heat pump energy storage module via a drive shaft; the first expander is used to provide kinetic energy to the heat pump energy storage module.

[0014] In some embodiments of this disclosure, the heat pump energy storage module includes a compressor, a second expander, a cryogenic storage tank, a high-temperature storage tank, and a high-temperature heat exchanger, wherein:

[0015] The first expander is axially connected to the compressor via a drive shaft;

[0016] The compressor is axially connected to the second expander via a drive shaft;

[0017] The heat pump energy storage module is connected to the shell side of the low-temperature heat exchanger through a circulation pipeline;

[0018] The tube side of the low-temperature heat exchanger is connected in sequence to the compressor, the shell side of the high-temperature heat exchanger, and the second expander via a circulation pipeline;

[0019] The outlet of the cryogenic storage tank is connected to the tube-side inlet of the high-temperature heat exchanger, and the tube-side outlet of the high-temperature heat exchanger is connected to the inlet of the high-temperature storage tank.

[0020] The outlet of the high-temperature storage tank is connected to the inlet of the unit's heat engine module through the heat exchange module;

[0021] The outlet of the unit's heat engine module is connected to the inlet of the cryogenic storage tank through the heat exchange module.

[0022] In some embodiments of this disclosure, the first drive shaft of the first expander is connected to the second drive shaft of the compressor via a coupling.

[0023] In some embodiments of this disclosure, the unit's thermal engine module includes a high-pressure cylinder, an intermediate- and low-pressure cylinder, a generator, a second condenser, a second working fluid pump, a low-pressure heater, a deaerator, a fourth working fluid pump, and a high-pressure heater, wherein:

[0024] The high-pressure cylinder is axially connected to the medium-low-pressure cylinder via a drive shaft, and the output shaft of the medium-low-pressure cylinder is connected to the generator.

[0025] The first outlet of the medium and low pressure cylinder is sequentially connected to the second condenser, the second working fluid pump, the low pressure heater, the deaerator, the fourth working fluid pump, the high pressure heater, and the heat exchange module.

[0026] The second outlet of the medium-low pressure cylinder is connected to the inlet of the low-pressure heater, and the third outlet of the medium-low pressure cylinder is connected to the inlet of the deaerator.

[0027] The outlet of the high-pressure cylinder is connected to the inlet of the high-pressure heater.

[0028] In some embodiments of this disclosure, the heat exchange module includes a steam generator, wherein:

[0029] The shell-side inlet of the steam generator is connected to the outlet of the high-temperature storage tank, and the shell-side outlet of the steam generator is connected to the inlet of the low-temperature storage tank.

[0030] The pipe-side inlet of the steam generator is connected to the inlet of the high-pressure heater, and the pipe-side outlet of the steam generator is connected to the inlet of the high-pressure cylinder.

[0031] In some embodiments of this disclosure, the heat exchange module further includes a first valve, wherein:

[0032] The first valve is installed on the pipeline between the shell-side inlet of the steam generator and the outlet of the high-temperature storage tank.

[0033] In some embodiments of this disclosure, the heat exchange module further includes a reheater, wherein:

[0034] The shell-side inlet of the reheater is connected to the outlet of the high-temperature storage tank, and the shell-side outlet of the reheater is connected to the inlet of the low-temperature storage tank.

[0035] The tube-side inlet of the reheater is connected to the inlet of the high-pressure heater, and the tube-side outlet of the reheater is connected to the inlet of the high-pressure cylinder.

[0036] In some embodiments of this disclosure, the heat exchange module further includes a second valve, wherein:

[0037] The second valve is installed on the pipeline between the shell-side inlet of the reheater and the outlet of the high-temperature storage tank.

[0038] In some embodiments of this disclosure, the unit's heat engine module further includes a cooling tower and a third working fluid pump, wherein:

[0039] The condenser is abnormally connected to the cooling tower and the third working fluid pump through the circulation pipeline.

[0040] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: a geothermal module is connected to an ORC power generation module via a first heat exchanger; the output end of the ORC power generation module is connected to the input end of a heat pump energy storage module; the ORC power generation module is used to input electrical energy into the heat pump energy storage module; the heat pump energy storage module is connected to the geothermal module via a low-temperature heat exchanger; the heat pump energy storage module is connected to the unit's heat engine module via a heat exchange module; the unit's heat engine module is used to convert the heat from the heat pump energy storage module into electrical energy using the heat exchange module. By converting geothermal energy into electrical energy through the ORC power generation module, the heat pump energy storage module is driven to upgrade and store the low-temperature geothermal energy, thereby improving the collection effect and utilization rate of geothermal energy.

[0041] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0042] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0043] Figure 1 This is a schematic diagram of a power generation system based on geothermal and organic Rankine cycle coupled energy storage, according to an exemplary embodiment.

[0044] Figure Labels

[0045] 1. Geothermal pipe; 2. Low-temperature heat exchanger; 3. Compressor; 5. High-temperature heat exchanger; 6. High-temperature storage tank; 7. Low-temperature storage tank; 8. Steam generator; 9. Reheater; 11. First heat exchanger; 12. First expander; 13. First condenser; 21. High-pressure cylinder; 22. Medium and low-pressure cylinder; 23. Second condenser; 24. Cooling tower; 25. Low-pressure heater; 26. Deaerator; 27. High-pressure heater; 31. First working fluid pump; 32. Second working fluid pump; 33. Third working fluid pump; 34. Fourth working fluid pump; 51. First valve; 52. Second valve; 61. Coupling; 62. Generator. Detailed Implementation

[0046] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0047] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. The singular forms “a” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0048] It should be understood that although the terms first, second, third, etc., may be used to describe various information in embodiments of this disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of embodiments of this disclosure, and similarly, second information may also be referred to as first information. Depending on the context, the words “if” and “suppose” as used herein may be interpreted as “when”, “when”, or “in response to a determination”.

[0049] Furthermore, various forms of processes shown in the embodiments of this disclosure can be used to reorder, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and no limitation is imposed herein.

[0050] Among related technologies, geothermal resources have the characteristics of large reserves, wide distribution, cleanliness and environmental protection, good stability and high utilization coefficient. They are a realistic and competitive renewable energy source. Existing geothermal energy utilization devices can collect geothermal energy through heat transfer structures, but due to their limited collection effect and utilization efficiency, they cannot fully meet our demand for conventional energy.

[0051] To address the aforementioned issues, this disclosure provides a power generation system based on geothermal and Organic Rankine Cycle (ORC) coupled energy storage. A geothermal module is connected to an ORC power generation module via a first heat exchanger. The output of the ORC power generation module is connected to the input of a heat pump energy storage module. The ORC power generation module supplies electrical energy to the heat pump energy storage module. The heat pump energy storage module is connected to the geothermal module via a low-temperature heat exchanger. The heat pump energy storage module is connected to the unit's heat engine module via a heat exchange module. The unit's heat engine module uses the heat exchange module to convert the heat from the heat pump energy storage module into electrical energy. By converting geothermal energy into electrical energy through the ORC power generation module, the heat pump energy storage module is used to upgrade and store the low-temperature geothermal energy, thereby improving the geothermal collection efficiency and utilization rate.

[0052] Figure 1 This is a flowchart illustrating a power generation system based on geothermal and organic Rankine cycle coupled energy storage according to an exemplary embodiment, such as... Figure 1 As shown, the system includes a geothermal module, an Organic Rankine Cycle (ORC) power generation module, a heat pump energy storage module, a heat exchange module, and a unit heat engine module.

[0053] The geothermal module is connected to the ORC power generation module through the first heat exchanger 11.

[0054] The output of the ORC power generation module is connected to the input of the heat pump energy storage module; the ORC power generation module is used to input electrical energy into the heat pump energy storage module.

[0055] The heat pump energy storage module is connected to the geothermal module through the low-temperature heat exchanger 2;

[0056] The heat pump energy storage module is connected to the unit's heat engine module through a heat exchange module; the unit's heat engine module is used to convert the heat from the heat pump energy storage module into electrical energy using the heat exchange module.

[0057] In one embodiment, the geothermal module transfers the acquired geothermal energy to the ORC power generation module through the first heat exchanger 11 to generate electricity. The ORC power generation module converts the geothermal energy into kinetic energy to power the heat pump energy storage module. The ORC power generation module acquires the heat collected by the geothermal module through the low-temperature heat exchanger 2, and uses the kinetic energy provided by the ORC power generation module to convert the collected low-temperature geothermal energy into high-temperature heat for storage. The unit's heat engine module uses the stored heat to generate electricity, thereby converting medium- and low-temperature geothermal energy into high-quality electricity, effectively improving the utilization rate of geothermal energy.

[0058] In one possible implementation example, the aforementioned unit heat engine module can utilize the heat engine system of an old thermal power plant. That is, the traditional boiler system of the thermal power plant is removed and replaced with geothermal energy. The heat stored in the heat pump energy storage system is used as the heat source of the heat engine system. By coupling geothermal energy, organic Rankine cycle, heat pump energy storage system and thermal power unit, the system's ramp-up capability and peak-shaving capability are improved, coal consumption is reduced, and the consumption of clean energy is promoted.

[0059] Furthermore, heat pump energy storage modules utilize common heat transfer media for heat storage, offering advantages such as low cost and high energy density. Moreover, heat pump energy storage modules are not limited by geographical conditions; by coupling with geothermal modules and ORC power generation modules, they can provide better regulation capabilities for new energy power generation, ensuring the safety and stability of the new power system.

[0060] In some embodiments, the working fluid used in this system can be an organic working fluid, such as R123, R245fa, etc.

[0061] In some embodiments of this application, the geothermal module includes a geothermal pipe 1, and the ORC power generation module includes a first expander 12, a first condenser 13, and a first working fluid pump 31, wherein:

[0062] Geothermal pipe 1 is connected to the shell side of the first heat exchanger 11 through a circulation pipeline;

[0063] The outlet of the first expander 12 is connected in sequence to the tube side of the first condenser 13, the first working fluid pump 31, the first heat exchanger 11, and the inlet of the first expander 12.

[0064] The first expander 12 is connected to the heat pump energy storage module via a drive shaft; the first expander 12 is used to provide kinetic energy to the heat pump energy storage module.

[0065] In one embodiment, such as Figure 1 As shown, during the system's energy storage phase, low-temperature water absorbs geothermal energy through geothermal pipe 1, transforming into medium-temperature water, which then enters the first heat exchanger 11 through a valve. In the first heat exchanger 11, the medium-temperature water exchanges heat with a high-pressure, low-temperature liquid organic working fluid. The organic working fluid evaporates upon heating, absorbing heat from the medium-temperature water. The evaporated gaseous organic working fluid then enters the first expander 12, expands, and performs work. It then returns to the first heat exchanger 11 via the first condenser 13 and the first working fluid pump 31, forming a circulation loop.

[0066] In some embodiments of this application, the heat pump energy storage module includes a compressor 3, a second expander, a cryogenic storage tank 7, a high-temperature storage tank 5, and a high-temperature heat exchanger 6, wherein:

[0067] The first expander 12 is axially connected to the compressor 3 via a drive shaft;

[0068] Compressor 3 is axially connected to the second expander via a drive shaft;

[0069] The heat pump energy storage module is connected to the shell side of the low-temperature heat exchanger 2 through a circulation pipeline;

[0070] The tube side of the low-temperature heat exchanger 2 is connected in sequence to the compressor 3, the shell side of the high-temperature heat exchanger, and the second expander via a circulation pipeline;

[0071] The outlet of the cryogenic storage tank 7 is connected to the tube-side inlet of the high-temperature heat exchanger, and the tube-side outlet of the high-temperature heat exchanger is connected to the inlet of the high-temperature heat exchanger 6 in the high-temperature storage tank 5.

[0072] The outlet of the high-temperature storage tank 5 is connected to the inlet of the unit's heat engine module via a heat exchange module;

[0073] The outlet of the unit's heat engine module is connected to the inlet of the cryogenic storage tank 7 via a heat exchange module.

[0074] In one embodiment, during the system energy storage phase, low-temperature water absorbs geothermal heat through geothermal pipe 1, becoming medium-temperature water, and then enters the low-temperature heat exchanger 2 through a valve. Through coupling 61, the first expander 12 drives the compressor 3, compressing the low-temperature, low-pressure working fluid at the compressor 3 inlet into a high-temperature, high-pressure state. This compressed fluid then enters the heat exchanger, exchanging heat with the incoming low-temperature heat storage medium. The heated low-temperature heat storage medium enters the high-temperature heat storage tank, storing the heat from the high-temperature, high-pressure circulating working fluid. The cooled circulating working fluid enters the expander to expand and perform work. The low-temperature, low-pressure circulating working fluid enters the low-temperature heat exchanger 2 from the expander outlet, exchanging heat with the incoming medium-temperature water. After absorbing heat from the medium-temperature water, it enters the inlet of the low-temperature heat exchanger 2, completing the energy storage cycle. The cooled medium-temperature water in the low-temperature heat exchanger 2 enters the geothermal pipe 1, completing the heat absorption cycle.

[0075] In some embodiments of this application, the first drive shaft of the first expander 12 is connected to the second drive shaft of the compressor 3 via a coupling 61.

[0076] Understandably, the ORC system expander and the heat pump energy storage system compressor 3 are coaxially connected via coupling 61, which reduces the loss of power output from the ORC system to the heat pump energy storage system and increases system efficiency.

[0077] In one example, when the ORC system is not working properly, coupling 6161 can be disconnected to use the curtailed solar and wind power to drive the heat pump energy storage system.

[0078] In some embodiments of this application, the unit's thermal engine module includes a high-pressure cylinder 21, an intermediate-low-pressure cylinder 22, a generator 62, a second condenser 23, a second working fluid pump 32, a low-pressure heater 25, a deaerator 26, a fourth working fluid pump 34, and a high-pressure heater 27, wherein:

[0079] The high-pressure cylinder 21 is axially connected to the medium-low pressure cylinder 22 via a drive shaft, and the output shaft of the medium-low pressure cylinder is connected to the generator 62.

[0080] The first outlet of the medium and low pressure cylinder 22 is sequentially connected to the second condenser 23, the second working fluid pump 32, the low pressure heater 25, the deaerator 26, the fourth working fluid pump 34, the high pressure heater 27, and the heat exchange module.

[0081] The second outlet of the medium-low pressure cylinder 22 is connected to the inlet of the low-pressure heater 25, and the third outlet of the medium-low pressure cylinder 22 is connected to the inlet of the deaerator 26.

[0082] The outlet of the high-pressure cylinder 21 is connected to the inlet of the high-pressure heater 27.

[0083] In some embodiments of this application, the heat exchange module includes a steam generator 8, wherein:

[0084] The shell-side inlet of steam generator 8 is connected to the outlet of high-temperature heat exchanger 6 in high-temperature storage tank 5, and the shell-side outlet of steam generator 8 is connected to the inlet of low-temperature storage tank 7.

[0085] The pipe-side inlet of the steam generator 8 is connected to the inlet of the high-pressure heater 27, and the pipe-side outlet of the steam generator 8 is connected to the inlet of the high-pressure cylinder 21.

[0086] In some embodiments of this application, the heat exchange module further includes a first valve 51, wherein:

[0087] The first valve 51 is installed on the pipeline between the shell-side inlet of the steam generator 8 and the outlet of the high-temperature heat exchanger of the high-temperature storage tank 5 6.

[0088] In one embodiment, during peak electricity demand, coupling 61 can be disconnected, allowing the ORC system to generate electricity in a conventional manner. The high-temperature medium stored in the heat pump energy storage system's storage tank enters the steam generator 8. In the steam generator 8, the high-temperature heat storage medium exchanges heat with the incoming high-pressure feedwater, heating the feedwater into high-temperature, high-pressure steam, which then expands and performs work in the high-pressure cylinder 21. The exhaust steam from the intermediate-low-pressure cylinder 22 enters the condenser, where it is condensed into liquid by the incoming cooling medium. The condensate is then pumped sequentially through the low-pressure heater 25, deaerator 26, and high-pressure heater 27, where it is heated by steam extracted from the intermediate-low-pressure cylinder 22 and high-pressure cylinder 21, finally entering the steam generator 8 to complete the power generation cycle.

[0089] In some embodiments of this application, the heat exchange module further includes a reheater 9, wherein:

[0090] The shell-side inlet of reheater 9 is connected to the outlet of high-temperature heat exchanger 6 in high-temperature storage tank 5, and the shell-side outlet of reheater 9 is connected to the inlet of low-temperature storage tank 7.

[0091] The tube-side inlet of reheater 9 is connected to the inlet of high-pressure heater 27, and the tube-side outlet of reheater 9 is connected to the inlet of high-pressure cylinder 21.

[0092] In some embodiments of this application, the heat exchange module further includes a second valve 52, wherein:

[0093] The second valve 52 is installed on the pipeline between the shell-side inlet of the reheater 9 and the outlet of the high-temperature heat exchanger 6 of the high-temperature storage tank 5.

[0094] In one embodiment, during peak electricity demand, coupling 61 can be disconnected, allowing the ORC system to generate electricity in a conventional manner. The high-temperature medium stored in the heat pump energy storage system's storage tank is divided into two parts: one part enters the steam generator 8, and the other part enters the reheater 9. In the steam generator 8, the high-temperature heat storage medium exchanges heat with the high-pressure feedwater flowing in the opposite direction, heating the high-pressure feedwater into high-temperature, high-pressure steam, which then enters the high-pressure cylinder 21 to expand and perform work. The exhaust steam from the high-pressure cylinder 21 enters the reheater 9, where it exchanges heat with the high-temperature heat storage medium flowing in the opposite direction, heating it into high-temperature steam, which then enters the intermediate-low-pressure cylinder 22 to expand and perform work. The exhaust steam from the intermediate-low-pressure cylinder 22 enters the condenser, where it is condensed into liquid by the cooling medium flowing in the opposite direction. Then, it is pumped by a condensate pump into the low-pressure heater 25, the deaerator 26, and the high-pressure heater 27, where it is successively heated by steam extracted from the intermediate-low-pressure cylinder 22 and the high-pressure cylinder 21, finally entering the steam generator 8 to complete the power generation cycle.

[0095] In some embodiments of this application, the unit's heat engine module further includes a cooling tower 24 and a third working fluid pump 33, wherein:

[0096] The condenser is abnormally connected to the cooling tower 24 and the third working fluid pump 33 through the circulation pipeline.

[0097] In some embodiments, in the ORC system, the circulating working fluid can be an organic working fluid, not limited to R123, R245fa, etc.; in the heat pump energy storage system, the circulating working fluid can be any gaseous working fluid selected from air, carbon dioxide, argon, nitrogen, and helium, with no limitation on the type of gaseous working fluid; the heat storage medium can be any one or more selected from potassium nitrate, calcium nitrate, sodium nitrate, sodium nitrite, lithium nitrate, and mineral oil. The cooling medium of the second condenser 23 in the unit's heat engine module is not limited to liquid or gas.

[0098] According to the power generation system based on geothermal and organic Rankine cycle coupled energy storage proposed in this disclosure, a geothermal module is connected to an ORC power generation module via a first heat exchanger; the output end of the ORC power generation module is connected to the input end of a heat pump energy storage module; the ORC power generation module is used to input electrical energy to the heat pump energy storage module; the heat pump energy storage module is connected to the geothermal module via a low-temperature heat exchanger; the heat pump energy storage module is connected to the unit's heat engine module via a heat exchange module; the unit's heat engine module is used to convert the heat from the heat pump energy storage module into electrical energy using the heat exchange module. By converting geothermal energy into electrical energy through the ORC power generation module, the heat pump energy storage module is driven to upgrade and store the low-temperature geothermal energy, thereby improving the geothermal collection efficiency and utilization rate.

[0099] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0100] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0101] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0102] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A power generation system based on geothermal and organic Rankine cycle coupling energy storage, characterized in that, It includes geothermal modules, Organic Rankine Cycle (ORC) power generation modules, heat pump energy storage modules, heat exchange modules, and unit heat engine modules, among which: The geothermal module is connected to the ORC power generation module through a first heat exchanger; The output terminal of the ORC power generation module is connected to the input terminal of the heat pump energy storage module; the ORC power generation module is used to input electrical energy into the heat pump energy storage module. The heat pump energy storage module is connected to the geothermal module through a low-temperature heat exchanger; The heat pump energy storage module is connected to the unit's heat engine module through the heat exchange module; the unit's heat engine module is used to convert the heat from the heat pump energy storage module into electrical energy using the heat exchange module.

2. The geothermal and organic Rankine cycle coupled energy storage based power generation system of claim 1, wherein, The geothermal module includes geothermal pipes, and the ORC power generation module includes a first expander, a first condenser, and a first working fluid pump, wherein: The geothermal pipe is connected to the shell side of the first heat exchanger via a circulation pipeline; The outlet of the first expander is connected in sequence to the tube side of the first condenser, the first working fluid pump, the first heat exchanger, and the inlet of the first expander. The first expander is connected to the heat pump energy storage module via a drive shaft; the first expander is used to provide kinetic energy to the heat pump energy storage module.

3. The geothermal and organic Rankine cycle coupled energy storage based power generation system of claim 2, wherein, The heat pump energy storage module includes a compressor, a second expander, a cryogenic storage tank, a high-temperature storage tank, and a high-temperature heat exchanger, wherein: The first expander is axially connected to the compressor via a drive shaft; The compressor is axially connected to the second expander via a drive shaft; The heat pump energy storage module is connected to the shell side of the low-temperature heat exchanger through a circulation pipeline; The tube side of the low-temperature heat exchanger is connected in sequence to the compressor, the shell side of the high-temperature heat exchanger, and the second expander via a circulation pipeline; The outlet of the cryogenic storage tank is connected to the tube-side inlet of the high-temperature heat exchanger, and the tube-side outlet of the high-temperature heat exchanger is connected to the inlet of the high-temperature storage tank. The outlet of the high-temperature storage tank is connected to the inlet of the unit's heat engine module through the heat exchange module; The outlet of the unit's heat engine module is connected to the inlet of the cryogenic storage tank through the heat exchange module.

4. The geothermal and organic Rankine cycle coupled energy storage based power generation system of claim 3, wherein, The first drive shaft of the first expander is connected to the second drive shaft of the compressor via a coupling.

5. The geothermal and organic Rankine cycle coupled energy storage based power generation system of claim 3, wherein, The unit's thermal engine module includes a high-pressure cylinder, intermediate and low-pressure cylinders, a generator, a second condenser, a second working fluid pump, a low-pressure heater, a deaerator, a fourth working fluid pump, and a high-pressure heater, wherein: The high-pressure cylinder is axially connected to the medium-low-pressure cylinder via a drive shaft, and the output shaft of the medium-low-pressure cylinder is connected to the generator. The first outlet of the medium and low pressure cylinder is sequentially connected to the second condenser, the second working fluid pump, the low pressure heater, the deaerator, the fourth working fluid pump, the high pressure heater, and the heat exchange module. The second outlet of the medium-low pressure cylinder is connected to the inlet of the low-pressure heater, and the third outlet of the medium-low pressure cylinder is connected to the inlet of the deaerator. The outlet of the high-pressure cylinder is connected to the inlet of the high-pressure heater.

6. The geothermal and organic Rankine cycle coupled energy storage based power generation system of claim 5, wherein, The heat exchange module includes a steam generator, wherein: The shell-side inlet of the steam generator is connected to the outlet of the high-temperature storage tank, and the shell-side outlet of the steam generator is connected to the inlet of the low-temperature storage tank. The pipe-side inlet of the steam generator is connected to the inlet of the high-pressure heater, and the pipe-side outlet of the steam generator is connected to the inlet of the high-pressure cylinder.

7. The geothermal and organic Rankine cycle coupling energy storage based power generation system according to claim 6, characterized in that, The heat exchange module further includes a first valve, wherein: The first valve is installed on the pipeline between the shell-side inlet of the steam generator and the outlet of the high-temperature storage tank.

8. The geothermal and organic Rankine cycle coupled energy storage based power generation system of claim 6, wherein, The heat exchange module further includes a reheater, wherein: The shell-side inlet of the reheater is connected to the outlet of the high-temperature storage tank, and the shell-side outlet of the reheater is connected to the inlet of the low-temperature storage tank. The tube-side inlet of the reheater is connected to the inlet of the high-pressure heater, and the tube-side outlet of the reheater is connected to the inlet of the high-pressure cylinder.

9. The geothermal and organic Rankine cycle coupling energy storage based power generation system of claim 8, wherein, The heat exchange module also includes a second valve, wherein: The second valve is installed on the pipeline between the shell-side inlet of the reheater and the outlet of the high-temperature storage tank.

10. The power generation system based on geothermal and organic Rankine cycle coupled energy storage according to claim 5, characterized in that, The unit's heat engine module also includes a cooling tower and a third working fluid pump, wherein: The condenser is abnormally connected to the cooling tower and the third working fluid pump through the circulation pipeline.

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