System integrating power generation heat recovery, heating energy storage and CO2 storage

Abstract

The invention discloses a system integrating power generation heat recovery, heating energy storage and CO2 storage, and relates to the technical field of energy utilization, a solar heat storage unit exchanges heat with a solar heat power generation unit through a condenser, a salt water layer CO2 storage unit exchanges heat with a heating unit through a heating heat exchanger, in a non-heating season, CO2 is pumped out from a liquid CO2 storage tank, and CO2 is stored in a liquid CO2 storage tank; the condensation heat of the solar thermal power generation unit is recovered through the condenser, and the heated CO2 is reheated in the vacuum heat collector and then is filled into the salt water layer; in the heating season, CO2 is extracted from the salt water layer, heat is transmitted to the heating unit through the heating heat exchanger, and the cooled CO2 is changed into a liquid state and then stored in the liquid CO2 storage tank. Solar thermal power generation, condensation heat recovery, solar heating, energy storage and saline water layer CO2 storage can be achieved at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization, and particularly relates to a system integrating power generation, heat recovery for heating, energy storage, and CO2 sequestration. Background Art

[0002] The building area in China has exceeded 64 billion m 2 , and more than half of it has heating requirements. Currently, more than 80% of the heating building area uses coal-based fuels as the heating heat source, and the coal consumption for heating per square meter of building is about 14.1 kg per year. Fossil fuel heating emits a large amount of CO 2 and further aggravates smog. There is an urgent need to increase the proportion of renewable energy heating. The solar energy resources in the northern heating regions of China are abundant, and the annual average solar radiation reaches 932,330 kWh / m2. In theory, this resource could make a huge contribution to heating. However, due to the intermittent and unstable nature of solar energy itself, its direct application in the heating field is greatly restricted. By the end of 2020, the solar heating area in China was only 16.5 million m 2 . Solar energy for heating requires heat storage facilities. Currently, large-capacity and low-cost energy storage facilities are the main bottleneck restricting its development, and underground saline aquifers are one of the best choices for realizing seasonal heat storage of solar energy.

[0003] The installed capacity of photovoltaic power generation in China has reached 440 million kilowatts, while the cumulative installed capacity of solar thermal power generation is only 588,000 kilowatts. Although solar thermal power generation is equipped with heat storage tanks, which can effectively solve the problems of imbalance and instability of solar energy, due to the too high equipment investment cost, the large-scale development of solar thermal power generation is severely restricted. In the situation of high investment, finding ways to increase revenue is the only way to reduce the investment payback period. Analyzing each link of solar thermal power generation, it is found that a large amount of condensation heat is dissipated into the air. If this part of heat can be recovered for heating, it will generate huge economic benefits.

[0004] Due to its good pore permeability and large storage space, saline aquifers are recognized as the best energy storage and CO 2 geological sequestration sites in the world. China has rich saline aquifer reserves, and saline aquifers are present beneath nearly half of the national territory, especially in basin areas where saline aquifers are extremely abundant. Currently, several CO 2 saline aquifer sequestration engineering practices have been carried out abroad, and demonstration projects have also been carried out in Ordos, China, demonstrating the feasibility, reliability, and safety of this solution. Sequestering CO 2 in a well-trapped saline aquifer has the advantage of a large sequestration capacity, but the disadvantage is that the cycle required for complete dissolution and petrochemical sequestration is too long, often hundreds or thousands of years, resulting in low utilization rate of underground space in saline aquifers and poor economic efficiency. Currently, single-purpose CO 2 underground sequestration, especially saline aquifer sequestration, has good social and environmental benefits but poor economic benefits (CO 2Enhanced oil and gas recovery excluded). If it is possible to reasonably utilize the storage space in the saline aquifer during the long-term geological storage of CO 2 and achieve both CO storage and energy storage simultaneously, it will be possible to create better economic benefits and promote the rapid development of the CO storage industry and its related industries. 2 There is a lack of a system in the existing technology that can utilize energy according to the characteristics of solar energy and saline aquifers simultaneously. 2

[0005] Summary of the Invention

[0006] In view of the deficiencies in the existing technology, the present invention provides a system integrating power generation, heat recovery, heating, energy storage, and CO 2 storage, which can simultaneously achieve solar thermal power generation, condensation heat recovery, solar heating, energy storage, and saline aquifer CO 2 storage.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A system integrating power generation, heat recovery, heating, energy storage, and CO 2 storage, comprising:

[0009] A solar thermal power generation unit, which includes a condenser;

[0010] A heating unit, which includes a heating heat exchanger;

[0011] A solar thermal energy storage unit, which includes: a liquid CO2 storage tank, the condenser, a vacuum collector, and an injection-production well connected in sequence through pipelines;

[0012] A saline aquifer CO 2 storage unit, which includes a saline aquifer, at least a part of the injection-production well is inserted into the CO 2 layer, and the upper part of the injection-production well is connected to the heating heat exchanger through a pipeline;

[0013] Wherein, the solar thermal energy storage unit exchanges heat with the solar thermal power generation unit through the condenser, and the saline aquifer CO 2 storage unit exchanges heat with the heating unit through the heating heat exchanger.

[0014] Non-heating season: CO 2 is pumped out from the liquid CO 2 storage tank, and the condensation heat of the solar thermal power generation unit is recovered through the condenser. After the temperature of the CO is raised, the 2 heated CO is filled into the saline aquifer after being reheated in the vacuum collector;

[0015] Heating season: CO 2extracted from the brine layer, and the heat is transferred to the heating unit through the heating heat exchanger, and the CO after cooling 2 becomes liquid, and then is stored in the liquid CO 2 storage tank.

[0016] The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system as described above. Further, the solar thermal power generation unit includes: a high-temperature heat collection and heating module, a power generation module, a heat regeneration module and a compression module, wherein,

[0017] The high-temperature heat collection and heating module includes a trough type concentrating collector, a high-temperature heat storage tank, a generator and a medium-temperature heat storage tank which are connected in sequence through pipelines to form a circulation loop;

[0018] The power generation module includes a high-temperature recuperator, the generator and an expander which are connected in sequence through pipelines to form a circulation loop, and the expander drives a generator to generate electricity;

[0019] The heat regeneration module includes the expander, the high-temperature recuperator, a low-temperature recuperator and the condenser which are connected through pipelines;

[0020] The compression module includes the condenser, a main compressor, the low-temperature recuperator, the high-temperature recuperator and a recompressor which are connected through pipelines.

[0021] The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system as described above. Further, the heating unit includes: a heating heat exchanger, a heat pump unit and a heating building which are connected through pipelines to form a circulation loop.

[0022] The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system as described above. Further, the brine layer includes a formation water layer, a CO 2 layer and a caprock which are arranged from deep to shallow.

[0023] The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system as described above. Further, a CO 2 pressurizing pump and a first valve are provided on the pipeline connecting the liquid CO2 storage tank and the condenser.

[0024] The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system as described above. Further, a second valve is provided on the pipeline connecting the liquid CO 2 storage tank and the heating heat exchanger.

[0025] The integrated power generation, heat recovery, heating energy storage and CO 2The sealed system, further, a third valve is provided on the pipeline connecting the injection-production well and the vacuum collector.

[0026] The integrated power generation, heat recovery, heating energy storage and CO 2 The sealed system, further, a fourth valve is provided on the pipeline connecting the injection-production well and the heating heat exchanger.

[0027] The integrated power generation, heat recovery, heating energy storage and CO 2 The sealed system, further, the high-temperature heat collection and heating module further includes a heat conduction oil pump, and the heat conduction oil pump is arranged between the trough-shaped concentrating collector and the medium-temperature heat storage tank.

[0028] The integrated power generation, heat recovery, heating energy storage and CO 2 The sealed system, further, the liquid CO 2 storage tank is buried underground.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. The hot CO 2 is filled into the saline aquifer to realize heat storage;

[0031] 2. In the heating heat exchanger, the CO 2 is condensed into a liquid state to improve the heat extraction power and reduce the volume of the above-ground storage tank.

[0032] 3. During energy storage and extraction, CO 2 sequestration in the saline aquifer is also carried out. The two are carried out simultaneously, which can reduce the CO 2 sequestration cost and improve economic benefits.

[0033] 4. The liquid CO 2 storage tank can be buried below the ground surface to improve safety and reduce the floor area.

[0034] 5. Recycling the condensation heat of solar thermal power generation for heating can improve the revenue of thermal power generation, reduce the investment payback period, and promote the rapid development of this industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of the system according to the embodiment of the present invention.

[0037] In the figure: 1. CO 2 pressurizing pump; 2. condenser; 3. high-temperature heat storage tank; 4. trough-shaped concentrating collector; 5. heat-conducting oil pump; 6. medium-temperature heat storage tank; 7. generator; 8. expander; 9. generator; 10. recompressor; 11. main compressor; 12. first valve; 13. second valve; 14. low-temperature regenerator; 15. high-temperature regenerator; 16. heating heat exchanger; 17. vacuum collector; 18. heating building; 19. heat pump unit; 20. third valve; 21. fourth valve; 22. injection-production well; 23. CO 2 layer; 24. structural water layer; 25. caprock; 26. liquid CO 2 storage tank. Specific implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0039] Embodiment:

[0040] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" in the embodiments of the present invention and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0041] In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The prior art lacks a system that can utilize energy simultaneously according to the characteristics of solar energy and saline aquifers. Based on this, the following inventive concept is proposed in this embodiment: In the non-heating season, liquid CO from the storage tank is used. 2 Recover the condensation heat of solar thermal power generation, and the heated CO 2 Is heated again by the vacuum tube collector, and then the hot CO 2 Is injected into the saline aquifer to achieve heat storage. In the heating season, the hot CO 2 Is extracted from the saline aquifer and first enters the heating heat exchanger. After the heat is extracted by the heat pump for heating, the cooled CO 2 Becomes liquid and is stored in the liquid CO 2 Storage tank, so as to simultaneously achieve solar thermal power generation, condensation heat recovery, solar heating, energy storage, and CO 2 Sequestration in the saline aquifer.

[0043] See Figure 1 As shown in, a system for integrated power generation, heat recovery, heating, energy storage, and CO 2 Sequestration provided in this embodiment includes a solar thermal power generation unit, a heating unit, a solar thermal storage unit, and a saline aquifer CO 2 Sequestration unit. Specifically, the solar thermal power generation unit includes a condenser 2; the heating unit includes a heating heat exchanger 16; the solar thermal storage unit includes: a liquid CO 2 Storage tank 26, the condenser 2, a vacuum collector 17, and an injection-production well 22 connected in sequence through pipelines; the saline aquifer CO 2 Sequestration unit includes a saline aquifer, and at least a part of the injection-production well 22 is inserted into the CO 2 Layer 23, and the upper part of the injection-production well 22 is connected to the heating heat exchanger 16 through a pipeline.

[0044] Among them, the solar thermal storage unit exchanges heat with the solar thermal power generation unit through the condenser 2, and the saline aquifer CO 2 The sequestration unit exchanges heat with the heating unit through the heating heat exchanger 16. In the non-heating season: CO 2 Is pumped out from the liquid CO 2 Storage tank 26, and the condensation heat of the solar thermal power generation unit is recovered through the condenser 2. The heated CO 2 Is heated again in the vacuum collector 17 and then injected into the saline aquifer; in the heating season: CO 2 Is extracted from the saline aquifer, and the heat is transferred to the heating unit through the heating heat exchanger 16. The cooled CO 2 Becomes liquid and is then stored in the liquid CO 2 Storage tank 26.

[0045] In the system provided in the above embodiments, the working fluids for solar thermal power generation, condensation heat recovery, and aquifer energy storage are all CO 2 , and CO 2 is used as the working fluid to recover the condensation heat of solar thermal power generation. After being heated, the CO 2 is heated again by the vacuum tube collector, and then charged into the aquifer for storage and heat extraction during the heating season for heating, realizing the integrated integration of thermal power generation, heat recovery, heating, aquifer energy storage, and CO 2 sequestration. In addition, using liquid CO 2 to recover the condensation heat of solar thermal power generation can be used for energy storage and heating.

[0046] In the system provided in the above embodiments, in the heating heat exchanger 16, CO 2 is condensed into a liquid state to increase the heat extraction power and reduce the volume of the above-ground storage tank. The liquid CO 2 is heated in two stages in series and then injected into the aquifer for storage. First, the condensation heat is recovered for primary heating, and then it is heated in the vacuum tube collector for secondary heating.

[0047] In the system provided in the above embodiments, aquifer CO 2 sequestration is carried out while storing and extracting energy, and the two are carried out simultaneously; the liquid CO 2 storage tank 26 can be buried below the ground surface to improve safety and reduce the floor area.

[0048] In one of the embodiments, the solar thermal power generation unit includes: a high-temperature heat collection and heating module, a power generation module, a heat regeneration module, and a compression module. Among them, the high-temperature heat collection and heating module includes a trough-type concentrating collector 4, a high-temperature heat storage tank 3, a generator 7, and a medium-temperature heat storage tank 6 that are connected in sequence through pipelines to form a circulation loop; the power generation module includes a high-temperature recuperator 15, the generator 7, and an expander 8 that are connected in sequence through pipelines to form a circulation loop, and the expander 8 drives a generator 9 to generate electricity; the heat regeneration module includes the expander 8, the high-temperature recuperator 15, a low-temperature recuperator 14, and the condenser 2 that are connected through pipelines; the compression module includes the condenser 2, a main compressor 11, the low-temperature recuperator 14, the high-temperature recuperator 15, and a recompressor 10 that are connected through pipelines.

[0049] In the above embodiments, the solar thermal power generation unit adopts a recompression Brayton cycle, using CO 2 as the power generation working fluid, and its main processes include high-temperature heat collection and heating, power generation, heat regeneration, and compression. The high-temperature heat collection and heating module exchanges heat with the power generation module through the generator 7 to heat the CO 2The working fluid for power generation heated into a gaseous state. The high-temperature recuperator 15 and the low-temperature recuperator 14 of the regenerative heat recovery module transfer the heat of the working fluid after power generation to the condenser 2 to recover the condensation heat of solar thermal power generation. The compression module includes two compression circuits composed of a main compressor 11 and a recompressor 10, namely, condenser 2 - main compressor 11 - low-temperature recuperator 14, and condenser 2 - recompressor 10 - high-temperature recuperator 15. Recycling the condensation heat of solar thermal power generation for heating can increase the revenue of thermal power generation, reduce the investment payback period, and promote the rapid development of this industry.

[0050] In one embodiment, the heating unit includes: a heating heat exchanger 16, a heat pump unit 19, and a heating building 18 connected by pipelines to form a circulation loop. The heat pump unit 19 connects the heating heat exchanger 16 and the heating building 18 together, and the heating heat exchanger 16 absorbs the heat of the CO 2 sequestered CO 2 . The CO 2 is cooled from a supercritical state to a liquid state in the heating heat exchanger 16, releasing a large amount of latent heat of phase change and increasing the thermal power of the system.

[0051] In one embodiment, the saline aquifer includes a formation water layer 24, a CO 2 layer 23, and a caprock 25 arranged from deep to shallow. The CO 2 filled and stored in the saline aquifer is mainly sequestered in the CO 2 layer. The energy storage of the saline aquifer and CO 2 sequestration cooperate, which can reduce the CO 2 sequestration cost and improve economic benefits.

[0052] In one embodiment, on the pipeline connecting the liquid CO 2 storage tank 26 and the condenser 2, there are a CO 2 pressurizing pump 1 and a first valve 12. On the pipeline connecting the liquid CO 2 storage tank 26 and the heating heat exchanger 16, there is a second valve 13. On the pipeline connecting the injection-production well 22 and the vacuum collector 17, there is a third valve 20. On the pipeline connecting the injection-production well 22 and the heating heat exchanger 16, there is a fourth valve 21. The high-temperature heat collection and heating module further includes a heat conduction oil pump 5, and the heat conduction oil pump 5 is arranged between the trough type concentrating collector 4 and the medium-temperature heat storage tank 6.

[0053] In one embodiment, the heat storage mode in the non-heating season: the first valve 12 and the third valve 20 are opened, and the second valve 13 and the fourth valve 21 are closed. The CO 2 coming from the liquid CO 2 storage tank 26 first passes through the CO 2After the pressurizing pump 1 increases the pressure, the condensing heat of solar thermal power generation is recovered in the condenser 2, and the temperature of the CO is increased. 2 After being reheated and raised in temperature in the vacuum collector 17, it is filled into the saline aquifer to realize heat storage. At the same time, the CO 2 is injected into the saline aquifer together with the heat storage, realizing the CO 2 sequestration in the saline aquifer. Heating season: The hot CO 2 is extracted from the saline aquifer, and the heat is transferred to the heat pump unit 19 in the heating heat exchanger 16 for heating. After the temperature drops, the CO 2 becomes liquid, and then is stored in the liquid CO 2 storage tank 26 to complete a cycle.

[0054] In the above embodiment, the CO 2 is cooled from the supercritical state to the liquid state in the heating heat exchanger 16, releasing a large amount of latent heat of phase change and increasing the thermal power of the system; the liquid CO 2 stored in the liquid CO 2 storage tank 26 is liquid CO 2 . Due to its large density, the volume of the storage tank is greatly reduced. At the same time, the storage tank can be buried underground, which is both safe and reduces the floor area; the saline aquifer energy storage and CO 2 sequestration can cooperate to reduce the CO

[0055] sequestration cost, improve economic benefits, and at the same time provide a large-capacity, high-efficiency and low-cost energy storage technology; recovering the condensing heat of solar thermal power generation for heating can increase the income of thermal power generation, reduce the investment payback period, and promote the rapid development of this industry. 2 becomes liquid at 25 °C after passing through the heating heat exchanger 16 and is stored in the liquid CO 2 storage tank 26. During heat storage in the non-heating season, the 25 °C liquid CO 2 from the CO 2 storage tank is pressurized by the pressurizing pump and then enters the condenser 2 to cool the hot CO 2 of solar thermal power generation, while recovering heat. After passing through the condenser 2, the liquid CO 2 is heated to 65 °C, while the CO 2 of solar thermal power generation is cooled to 32 °C. Then, the 65 °C enters the vacuum collector 17 and is heated to 80 °C, and then injected into the saline aquifer to realize heat storage. On the solar thermal power generation side, the high-temperature CO 2 entering the expander 8 has a temperature of 550 °C and a pressure of 20 MPa. The power of the vacuum collector 17 is 864.20 kW, and the power of the condenser 2 is 2850.40 kW. The power generation power of the generator 9 is 3338.2 kW, and the heat exchange power of the generator 7 is 5220.0 kW.

[0056] In the above embodiments, the system can not only store solar thermal energy, but also store industrial waste heat, and can also convert wind energy into thermal energy for storage.

[0057] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the 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 construed as a limitation of the present invention.

[0058] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

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

[0060] The above embodiments are only for explaining the technical concept and characteristics of the present invention, and the purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, and should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the essence of the content of the present invention should be covered by the protection scope of the present invention.

Claims

1. An integrated power generation, heat recovery, heating, energy storage and CO 2 sequestration system It is characterized in that including a solar thermal power generation unit, which includes a condenser a heating unit, which includes a heating heat exchanger Solar thermal storage unit, comprising: liquid CO connected in sequence through pipelines 2 storage tank, the condenser, the vacuum collector and the injection-production well; Saline aquifer CO 2 sequestration unit, which includes a saline aquifer, and the injection-production well is at least partially inserted into the CO 2 layer, and the upper part of the injection-production well is connected to the heating heat exchanger through a pipeline; Among them, the solar thermal storage unit exchanges heat with the solar thermal power generation unit through the condenser, and the saline aquifer CO 2 sequestration unit exchanges heat with the heating unit through a heating heat exchanger. Non-heating season: CO 2 is pumped out from the liquid CO 2 storage tank, and the condensation heat of the solar thermal power generation unit is recovered by the condenser, and the temperature of the CO 2 is further heated and raised in the vacuum collector and then injected into the saline aquifer; Heating season: CO 2 is extracted from the brine formation, and heat is transferred to the heating unit through the heating heat exchanger. After the temperature is reduced, the CO 2 becomes liquid, and then is stored in the liquid CO 2 storage tank.

2. The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system according to claim 1 It is characterized in that the solar thermal power generation unit includes: a high-temperature heat collection and heating module, a power generation module, a heat regeneration module, and a compression module, wherein the high-temperature heat collection and heating module includes a trough-shaped concentrating collector, a high-temperature heat storage tank, a generator, and a medium-temperature heat storage tank that are sequentially connected through pipelines to form a circulation loop the power generation module includes a high-temperature regenerator, the generator, and an expander that are sequentially connected through pipelines to form a circulation loop, and the expander drives a generator to generate electricity the heat regeneration module includes the expander, the high-temperature regenerator, a low-temperature regenerator, and the condenser that are connected through pipelines the compression module includes the condenser, a main compressor, the low-temperature regenerator, the high-temperature regenerator, and a re-compressor that are connected through pipelines 3. The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system according to claim 1 It is characterized in that the heating unit includes: a heating heat exchanger, a heat pump unit, and a heating building that are connected through pipelines to form a circulation loop 4. The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system according to claim 1 It is characterized in that The saline aquifer includes a tectonic water layer, a CO 2 layer, and a caprock, which are arranged from deep to shallow.

5. The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system according to claim 1 It is characterized in that The liquid CO 2 A CO 2 pressure pump and a first valve are provided on the pipeline connecting the storage tank and the condenser.

6. The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system according to claim 1 It is characterized in that The liquid CO 2 A second valve is provided on the pipeline connecting the storage tank and the heating heat exchanger.

7. The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system according to claim 1 It is characterized in that a third valve is provided on the pipeline connecting the injection-production well and the vacuum collector 8. The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system according to claim 1 It is characterized in that a fourth valve is provided on the pipeline connecting the injection-production well and the heating heat exchanger 9. The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system according to claim 2 It is characterized in that the high-temperature heat collection and heating module further includes a heat conduction oil pump, and the heat conduction oil pump is arranged between the trough-shaped concentrating collector and the medium-temperature heat storage tank 10. The integrated power generation, heat recovery, heating energy storage and CO 2 sequestration system according to claim 1 It is characterized in that The liquid CO 2 storage tank is buried underground.

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