Geothermal energy storage and utilization system based on combined heat and power generation unit and back pressure unit

Abstract

The utility model provides a geothermal energy storage system based on a combined heat and power generation unit and a back pressure unit, and relates to the technical field of underground heat storage. The geothermal energy storage and utilization system based on the combined heat and power generation unit and the back pressure unit comprises a cold storage device used for storing cooling water and outputting the cooling water; the heat supply device is connected with the cold storage device, selectively communicates with the first steam turbine, the second steam turbine and the cold storage device and is used for heating cooling water through steam output by the first steam turbine and the second steam turbine to form hot water; the heat storage device is used for storing and outputting hot water; and the heat utilization device is connected with the cold storage device and the heat storage device, selectively communicates with the heat supply network system, the cold storage device and the heat storage device and is used for heating heat supply network return water through hot water, and heat-lost hot water becomes cooling water to be fed into the cold storage device to be stored. The problems that in the prior art, in the non-heating season, heat energy of a combined heat and power generation unit is wasted, and resources are wasted due to the fact that a back pressure unit is idle are solved, and meanwhile the heating gap is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of underground heat storage, and in particular to a geothermal energy storage system based on a cogeneration unit and a back pressure unit. Background Art

[0002] At present, the northern part of my country uses cogeneration units and back pressure units for heating. The back pressure units are activated in the heating season for 4 months and deactivated in the non-heating season for up to 8 months, which results in a certain waste of resources. The cogeneration units also dissipate a large amount of heat energy in the non-heating season, causing great waste. At the same time, the northern heating areas face a large heating gap in the heating season. Therefore, under the dual carbon goals, how to effectively utilize the idle back pressure unit resources, reduce the heat energy waste of cogeneration units, reduce coal consumption, achieve clean heating, and increase the heating area in the heating season has become an urgent problem to be solved. Utility Model Content

[0003] The purpose of the embodiment of the utility model is to provide a geothermal energy storage system based on a cogeneration unit and a back pressure unit, which is used to solve the problem of heat energy waste of the cogeneration unit in the non-heating season and resource waste caused by the idle back pressure unit in the prior art.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a geothermal energy storage system based on a cogeneration unit and a back pressure unit, which is connected to a heat network system and a first steam turbine of the cogeneration unit and a second steam turbine of the back pressure unit. The geothermal energy storage system based on the cogeneration unit and the back pressure unit includes:

[0005] A cold storage device, used for storing cooling water and outputting cooling water through a pipeline assembly;

[0006] A heat supply device is connected to the cold storage device through the pipeline assembly and is selectively connected to the first steam turbine, the second steam turbine and the cold storage device, and the heat supply device is used to heat the cooling water to form hot water through the steam output by the first steam turbine and the second steam turbine, and the heat-depleted steam forms condensed water for discharge;

[0007] A heat storage device, selectively connected to the heat supply device, for storing hot water and outputting the hot water through the pipeline assembly;

[0008] The heat-using device is connected to the cold storage device and the heat storage device through the pipeline assembly, and is selectively connected to the heat network system, the cold storage device and the heat storage device. The heat-using device is used to heat the heat network return water of the heat network system through the hot water output by the heat storage device, and the hot water that loses heat becomes cooling water and is sent to the cold storage device for storage through the pipeline assembly.

[0009] Specifically, the geothermal energy storage system based on the cogeneration unit and the back pressure unit also includes: a booster pump, which is arranged on the pipeline assembly and selectively connected to the cold storage device and the heat storage device, and is used to boost the cooling water pressure output by the cold storage device or boost the hot water pressure output by the heat storage device.

[0010] Specifically, the cold storage device includes: a cold storage well and a cold water pump;

[0011] The cold storage well is connected to the heat-using device through the pipeline assembly and is used to store cooling water;

[0012] The water outlet end of the cold water pump is connected to the heating device through the pipeline assembly, and is used to pump cooling water to the heating device through the pipeline assembly.

[0013] Specifically, the cold storage device further includes: a cold water desander, which is arranged at the water outlet of the cold water pump and is used to separate the debris in the cooling water.

[0014] Specifically, the heating device includes: a heating heat exchanger and a steam trap;

[0015] The heat supply heat exchanger has a heat supply inlet, a heat supply outlet, a heat source inlet and a heat source outlet, the heat supply inlet is connected to the cold storage device through the pipeline assembly, the heat supply outlet is connected to the heat storage device through the pipeline assembly, the heat source inlet is connected to the first steam turbine and the second steam turbine, steam enters the heat supply heat exchanger from the heat source inlet to heat the cooling water entering the heat supply heat exchanger from the heat supply inlet, the heat-losing steam forms condensed water and is discharged through the heat source outlet, and the heated cooling water forms hot water and is discharged through the heat supply outlet;

[0016] The steam trap is arranged at the heat source outlet of the heat supply heat exchanger, and is used to control the discharge of the condensed water.

[0017] Specifically, the heat storage device includes: a heat storage well and a hot water pump;

[0018] The heat storage well is connected to the heating device through the pipeline assembly and is used to store hot water;

[0019] The water outlet end of the hot water pump is connected to the heat-using device through the pipeline assembly, and is used to pump hot water to the heat-using device through the pipeline assembly.

[0020] Specifically, the heat storage device further includes: a hot water desander, which is arranged at the water outlet of the hot water pump and is used to separate foreign particles in the hot water.

[0021] Specifically, the heat-using device includes: a heat exchanger and a heat pump;

[0022] The heat pump is in communication with the heat exchanger and selectively in communication with the heat network system, and is used to recover the heat energy of the heat network return water of the heat network system and to transport the heat network return water after heat loss to the heat exchanger;

[0023] The heat exchanger is connected to the cold storage device and the heat storage device through the pipeline assembly, and is used to preliminarily heat the heat network return water after heat loss through the hot water output by the heat storage device to become preheated return water;

[0024] The heat pump is also used to reheat the preheated return water after heat loss through the recovered heat energy.

[0025] Specifically, the geothermal energy storage system based on the cogeneration unit and the back pressure unit also includes: a power device connected to the heat pump and used to drive the heat pump to work.

[0026] Specifically, the geothermal energy storage and utilization system based on the cogeneration unit and the back pressure unit also includes: multiple groups of control valves, which are arranged on the pipeline assembly, and the multiple groups of control valves are used to control the selective connection between the heating device and the cold storage device and the heat storage device, and the selective connection between the heating device and the cold storage device and the heat storage device.

[0027] The utility model provides a geothermal energy storage and utilization system based on a cogeneration unit and a back pressure unit, wherein a cold storage device sends stored cooling water to a heating device through a pipeline assembly, the heating device heats the cooling water to become hot water through the steam of a first steam turbine and a second steam turbine connected thereto, and sends the hot water to the heat storage device through the pipeline assembly for storage, when heating is needed, the heat storage device sends hot water to the heat-using device through the pipeline assembly, the heat-using device heats the heat network return water of a heat network system connected thereto through the hot water from the heat storage device, thereby providing heating to the user end, and the hot water after losing heat is sent to the cold storage device through the pipeline assembly for storage as cooling water.

[0028] The geothermal energy storage system based on the cogeneration unit and the back pressure unit provided by the utility model can utilize the excess steam of the first turbine of the cogeneration unit and the second turbine of the back pressure unit to generate steam in the non-heating season to heat cooling water and store it as hot water, so as to heat the heat network return water with the stored hot water in the heating season when heating is needed to supply heat to the user end, thus solving the problems of heat energy waste of the cogeneration unit in the non-heating season and resource waste caused by the idle back pressure unit in the prior art, solving the heating gap at the same time and avoiding the problem of extra resource consumption for heating in the heating season.

[0029] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0031] Figure 1 It is a schematic diagram of the layout of a geothermal energy storage system based on a cogeneration unit and a back pressure unit provided in an embodiment of the utility model.

[0032] Description of Reference Numerals

[0033] 1-cold storage device; 2-heat supply device; 3-pipeline assembly; 4-heat storage device; 5-heat using device; 6-boosting pump; 7-power unit; 8-heat network system; 9-condensate collection device; 11-cold storage well; 12-cold water pump; 13-cold water desander; 21-heat supply heat exchanger; 22-drain; 41-heat storage well; 42-hot water pump; 43-hot water desander; 51-heat using heat exchanger; 52-heat pump; 31, 32, 33, 34, 35, 36, 81, 82, 91-control valve. DETAILED DESCRIPTION

[0034] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0035] Figure 1 This is a schematic diagram of the layout of a geothermal energy storage system based on a cogeneration unit and a back-pressure unit.

[0036] like Figure 1 As shown, the utility model provides a geothermal energy storage system based on a cogeneration unit and a back pressure unit, which is connected to a heat network system 8 and a first steam turbine of the cogeneration unit and a second steam turbine of the back pressure unit. The geothermal energy storage system based on the cogeneration unit and the back pressure unit includes:

[0037] A cold storage device 1, used for storing cooling water and outputting cooling water through a pipeline assembly 3;

[0038] The heat supply device 2 is connected to the cold storage device 1 through the pipeline assembly 3, and is selectively connected to the first steam turbine, the second steam turbine and the cold storage device 1. The heat supply device 2 is used to heat the cooling water to form hot water through the steam output by the first steam turbine and the second steam turbine, and the heat-losing steam forms condensed water for discharge;

[0039] A heat storage device 4, selectively connected to the heat supply device 2, for storing hot water and outputting the hot water through the pipeline assembly 3;

[0040] The heat-using device 5 is connected to the cold storage device 1 and the heat storage device 4 through the pipeline assembly 3, and is selectively connected to the heat network system 8, the cold storage device 1 and the heat storage device 4. The heat-using device 5 is used to heat the heat network return water of the heat network system 8 through the hot water output by the heat storage device 4, and the hot water that loses heat becomes cooling water and is sent to the cold storage device 1 for storage through the pipeline assembly 3.

[0041] The geothermal energy storage and utilization system based on the cogeneration unit and the back pressure unit provided by the utility model utilizes the steam generated by the first steam turbine of the cogeneration unit and the second steam turbine of the back pressure unit in the non-heating season to heat the cooling water transported from the cold storage device 1 through the pipeline component 3. The heated cooling water becomes hot water, which is sent to the heat storage device 4 through the pipeline component 3 for storage. In this way, the cooling water absorbs the thermal energy of the steam generated by the first steam turbine and the second steam turbine in the non-heating season and is finally stored in the heat storage device 4. In the heating season, the heat storage device 4 sends the stored hot water to the heat using device 5 through the pipeline component 3. The heat using device 5 heats the heat network return water of the heat network system 8 connected thereto by the hot water, and the heated heat network return water enters the heat network system 8 again to provide heating for the user end. The geothermal energy storage and utilization system based on the cogeneration unit and the back pressure unit provided by the utility model can store the heat energy in the steam generated by the first turbine of the cogeneration unit and the second turbine of the back pressure unit in the non-heating season through the heat storage device 4, and then use the stored heat energy to heat the return water of the heat network through the heat utilization device 5 in the heating season to provide heating for the user end. In this way, the waste of heat energy of the cogeneration unit in the non-heating season can be avoided, and at the same time, the back pressure unit can continue to generate electricity and recover the excess heat energy generated in the non-heating season, thereby avoiding equipment idleness and energy waste, and solving the problems of heat energy waste of the cogeneration unit in the non-heating season and resource waste caused by idleness of the back pressure unit in the prior art.

[0042] like Figure 1 As shown in the figure, in order to stably pump the cooling water in the cold storage device 1 to the heating device 2 or pump the hot water in the heat storage device 4 to the heat using device 5, the geothermal energy storage and utilization system based on the cogeneration unit and the back pressure unit also includes: a booster pump 6, which is arranged on the pipeline assembly 3 and selectively connected to the cold storage device 1 and the heat storage device 4, and is used to boost the cooling water pressure output by the cold storage device 1 or boost the hot water pressure output by the heat storage device 4.

[0043] In one embodiment, Figure 1 As shown, the cold storage device 1 comprises: a cold storage well 11 and a cold water pump 12;

[0044] The cold storage well 11 is connected to the heat using device 5 through the pipeline assembly 3 and is used to store cooling water;

[0045] The water outlet end of the cold water pump 12 is connected to the heating device 2 through the pipeline assembly 3 , and is used to pump cooling water to the heating device 2 through the pipeline assembly 3 .

[0046] The cold storage device 1 further comprises: a cold water desander 13, which is arranged at the water outlet of the cold water pump 12 and is used to separate the impurities in the cooling water.

[0047] The heat storage device 4 includes: a heat storage well 41 and a hot water pump 42;

[0048] The heat storage well 41 is connected to the heating device 2 via the pipeline assembly 3 and is used to store hot water;

[0049] The water outlet end of the hot water pump 42 is connected to the heat-using device 5 through the pipeline assembly 3 , so as to pump hot water to the heat-using device 5 through the pipeline assembly 3 .

[0050] The heat storage device 4 further includes a hot water desander 43 , which is disposed at the water outlet of the hot water pump 42 and is used to separate foreign particles in the hot water.

[0051] In the non-heating season, the cold storage well 11 stores cooling water and recovers hot water that has lost heat from the heat-using device 5. The cold water pump 12 pumps the cooling water in the cold storage well 11 to the heating device 2 through the pipeline assembly 3. The cooling water exchanges heat with the steam from the first steam turbine and the second steam turbine in the heating device 2 to become hot water. The hot water is sent to the heat storage well 41 of the heat storage device 4 through the pipeline assembly 3 for storage. In the heating season, the hot water pump 42 in the heat storage well 41 pumps the stored hot water to the heat-using device 5 through the pipeline assembly 3. The hot water exchanges heat with the heat network return water entering the heat-using device 5 to heat the heat network return water. The heated heat network return water enters the heat network system 8 to provide heating for the user end, and the hot water that has lost heat becomes cooling water and enters the cold storage well 11 again for storage through the pipeline assembly 3.

[0052] In order to utilize the steam waste heat of the first steam turbine of the cogeneration unit and the second steam turbine of the back pressure unit, Figure 1 As shown, the heat supply device 2 includes: a heat supply heat exchanger 21 and a steam trap 22;

[0053] The heat supply heat exchanger 21 has a heat supply inlet, a heat supply outlet, a heat source inlet and a heat source outlet. The heat supply inlet is connected to the cold storage device 1 through the pipeline assembly 3, the heat supply outlet is connected to the heat storage device 4 through the pipeline assembly 3, the heat source inlet is connected to the first steam turbine and the second steam turbine, steam enters the heat supply heat exchanger 21 from the heat source inlet to heat the cooling water entering the heat supply heat exchanger 21 from the heat supply inlet, the heat-losing steam forms condensed water and is discharged through the heat source outlet, and the heated cooling water forms hot water and is discharged through the heat supply outlet;

[0054] The steam trap 22 is disposed at the heat source outlet of the heat supply heat exchanger 21 and is used to control the discharge of the condensed water.

[0055] The steam from the first steam turbine and the steam generated by the second steam turbine enter the heat supply heat exchanger 21 through the heat source inlet of the heat supply heat exchanger 21, and the cooling water enters the heat supply heat exchanger 21 through the heat supply inlet. The steam entering the heat supply heat exchanger 21 exchanges heat with the cooling water, and the cooling water is heated by the steam. The heated cooling water becomes hot water and flows out from the heat supply outlet, and then enters the heat storage well 41 of the heat storage device 4 through the pipeline assembly 3. After the steam exchanges heat with the cooling water, it becomes condensed water and is discharged from the heat source outlet of the heat supply heat exchanger 21, and is finally sent to the condensed water collecting device 9. A steam trap 21 is arranged at the heat source outlet of the heat supply heat exchanger 21, and the condensed water is discharged from the heat supply heat exchanger 21 by adjusting the opening of the steam trap 21.

[0056] In order to heat the return water of the heating network by the hot water stored in the heat storage device 4, the heat using device 5 includes: a heat using heat exchanger 51 and a heat pump 52;

[0057] The heat pump 52 is in communication with the heat exchanger 51 and selectively in communication with the heat network system 8, and is used to recover the heat energy of the heat network return water of the heat network system 8, and to transport the heat network return water after heat loss to the heat exchanger 51;

[0058] The heat exchanger 51 is connected to the cold storage device 1 and the heat storage device 4 through the pipeline assembly 3, and is used to preliminarily heat the hot water output by the heat storage device 4 to form the heat network return water after heat loss into preheated return water;

[0059] The heat pump 52 is also used for secondary heating and preheating return water by recovering heat energy.

[0060] The geothermal energy storage system based on the combined heat and power unit and the back pressure unit also includes: a power device 7 connected to the heat pump 52 and used to drive the heat pump 52 to work.

[0061] like Figure 1As shown, a heat pump 52 and a heat exchanger 51 are provided. The power device 7 provides electric energy or steam energy to the heat pump to drive the heat pump 52 to work. The heat exchanger 51 has a return water inlet, a return water outlet, a hot water inlet and a hot water outlet. The heat pump 52 and the return water inlet and the water inlet of the heat network system 8 are connected through a pipeline. The return water of the heat network flows out from the return water inlet of the heat network system 8 and enters the heat pump 52. The heat pump 52 recovers the heat energy in the return water of the heat network. The return water of the heat network after losing heat enters through the return water inlet of the heat exchanger 51. At the same time, the hot water from the heat storage device 4 is transported from the hot water inlet through the pipeline component 3. The heat exchanger 51 is used for heat utilization, and the return water from the heating network after losing heat exchanges heat with hot water in the heat exchanger 51. The return water from the heating network after losing heat is preliminarily heated by hot water, and becomes preheated return water after preliminarily heating. The preheated return water flows out from the return water outlet of the heat exchanger 51 and enters the heat pump 52. The heat pump 52 reheats the preheated return water by using the heat energy recovered from the return water from the heating network. The heated preheated return water is sent to the heating network system 8 through the water inlet of the heating network to provide heating for the user end. After completing the heat exchange with the return water from the heating network after losing heat, the hot water loses heat and becomes cooling water and is sent to the cold storage well 11.

[0062] In one embodiment, Figure 1 As shown, the heat supply device 2 is connected to the cold storage device 1 and the heat storage device 4 through the pipeline assembly 3, and the heat using device 5 is connected to the cold storage device 1 and the heat storage device 4 through the pipeline assembly 3. In order to ensure that the pipeline assembly 3 can smoothly transport cooling water and hot water, the geothermal energy storage and utilization system based on the cogeneration unit and the back pressure unit also includes: multiple groups of control valves, which are arranged on the pipeline assembly 3, and the heat supply device 2 is selectively connected to the cold storage device 1 and the heat storage device 4, and the heat using device 5 is selectively connected to the cold storage device 1 and the heat storage device 4. By controlling the corresponding control valves to open or close, it is possible to control the heat supply device 2 to be connected or disconnected with the cold storage device 1, the heat supply device to be connected or disconnected with the heat storage device 4, the heat using device 5 to be connected or disconnected with the cold storage device 1, or the heat using device 5 to be connected or disconnected with the heat storage device 4.

[0063] The pipeline assembly 3 includes a plurality of branch pipelines. The water inlet of the booster pump 6 is connected to the water outlet of the hot water pump 42 through a branch pipeline. The water inlet of the booster pump 6 is also connected to the water outlet of the cold water pump 12 through a branch pipeline. In order to transport cooling water or hot water respectively, a control valve 31 is provided on the branch pipeline between the booster pump 6 and the cold water pump 12; a control valve 32 is provided on the branch pipeline between the booster pump 6 and the hot water pump 42; the water outlet of the booster pump 6 is connected to the heat supply inlet of the heat supply heat exchanger 21 through a branch pipe, and a control valve 34 is provided on the branch pipeline. The heat supply outlet of the heat supply heat exchanger 21 is connected to the heat storage well 41 through a branch pipeline, and a control valve 33 is provided on the branch pipeline between the heat supply outlet of the heat supply heat exchanger 21 and the heat storage well 41; The water outlet of the booster pump 6 is also connected to the hot water inlet of the heat exchanger 51 through a branch pipe, and a control valve 35 is arranged on the branch pipe. The hot water outlet of the heat exchanger 51 is connected to the cold storage well 11 through a branch pipe, and a control valve 36 is arranged on the branch pipe between the hot water outlet of the heat exchanger 51 and the cold storage well 11. In order to control the selective connection between the heat pump 52 and the heating network system, a control valve 81 is arranged between the heat pump 52 and the heating network return port of the heating network system, and a control valve 82 is arranged between the heat pump 52 and the heating network water inlet of the heating network system. In order to control the timing of steam entering the heating supply heat exchanger 21, a control valve 91 is arranged on the connecting pipe between the heat source inlet of the heating supply heat exchanger 21 and the first steam turbine and the second steam turbine. When the heat energy of the first steam turbine and the second steam turbine needs to be stored in the non-heating season, the control valves 31, 34, 91 and 33 are opened, and the control valves 32, 35, 36, 81 and 82 are closed at the same time. At this time, the cold water pump 12 pumps cooling water, and the cooling water is pressurized by the booster pump 6 and pumped to the heat exchanger 21 for heating. The cooling water and steam exchange heat in the heat exchanger 21. The cooling water is heated by the steam and enters the corresponding branch pipe. The heat storage well 41 is used for storage; when heat needs to be supplied to the user end during the heating season, the control valves 32, 35, 36, 81 and 82 are opened, and the control valves 31, 34, 33 and 91 are closed at the same time. At this time, the hot water pump 42 pumps hot water, which is pressurized by the booster pump 6 and then sent to the heat exchanger 51. The hot water heats the return water of the heat network in the heat exchanger 51. The hot water after losing heat becomes cooling water and enters the cold storage well 11 for storage through the corresponding branch pipe.

[0064] The utility model provides a geothermal energy storage and utilization system based on a cogeneration unit and a back pressure unit, wherein a cold storage device sends stored cooling water to a heating device through a pipeline assembly, the heating device heats the cooling water to become hot water through the steam of a first steam turbine and a second steam turbine connected thereto, and sends the hot water to the heat storage device through the pipeline assembly for storage, when heating is needed, the heat storage device sends hot water to the heat-using device through the pipeline assembly, the heat-using device heats the heat network return water of a heat network system connected thereto through the hot water from the heat storage device, thereby providing heating to the user end, and the hot water after losing heat is sent to the cold storage device through the pipeline assembly for storage as cooling water.

[0065] The geothermal energy storage system based on the cogeneration unit and the back pressure unit provided by the utility model can utilize the excess steam of the first turbine of the cogeneration unit and the second turbine of the back pressure unit to generate steam in the non-heating season to heat cooling water and store it as hot water, so as to heat the heat network return water with the stored hot water in the heating season when heating is needed to supply heat to the user end, thus solving the problems of heat energy waste of the cogeneration unit in the non-heating season and resource waste caused by the idle back pressure unit in the prior art, solving the heating gap at the same time and avoiding the problem of extra resource consumption for heating in the heating season.

[0066] The optional implementation modes of the embodiments of the utility model are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the utility model are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the utility model, the technical scheme of the embodiments of the utility model can be subjected to various simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the utility model.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the utility model will not further describe various possible combinations.

[0068] In addition, various implementations of the embodiments of the present utility model can also be arbitrarily combined, as long as they do not violate the concept of the embodiments of the present utility model, they should also be regarded as the contents disclosed in the embodiments of the present utility model.

Claims

1. A geothermal energy storage system based on a cogeneration unit and a back pressure unit, connected to a heat network system (8) and a first steam turbine of the cogeneration unit and a second steam turbine of the back pressure unit, characterized in that: The geothermal energy storage system based on the combined heat and power unit and the back pressure unit includes: A cold storage device (1) for storing cooling water and outputting the cooling water through a pipeline assembly (3); A heat supply device (2) is connected to the cold storage device (1) via the pipeline assembly (3), and is selectively connected to the first steam turbine, the second steam turbine and the cold storage device (1), wherein the heat supply device (2) is used to heat the cooling water to form hot water by means of the steam output by the first steam turbine and the second steam turbine, and the heat-depleted steam forms condensed water for discharge; A heat storage device (4), selectively connected to the heat supply device (2), and used for storing hot water and outputting the hot water through the pipeline assembly (3); The heat-using device (5) is connected to the cold storage device (1) and the heat storage device (4) via the pipeline assembly (3), and is selectively connected to the heat network system (8), the cold storage device (1) and the heat storage device (4). The heat-using device (5) is used to heat the heat network return water of the heat network system (8) by means of the hot water output by the heat storage device (4), and the hot water that loses heat becomes cooling water and is sent to the cold storage device (1) for storage via the pipeline assembly (3).

2. The geothermal energy storage system based on a cogeneration unit and a back pressure unit according to claim 1, characterized in that: The geothermal energy storage system based on the combined heat and power unit and the back pressure unit also includes: a booster pump (6), which is arranged on the pipeline assembly (3) and selectively connected to the cold storage device (1) and the heat storage device (4), and is used to boost the pressure of cooling water output by the cold storage device (1) or boost the pressure of hot water output by the heat storage device (4).

3. The geothermal energy storage system based on a cogeneration unit and a back pressure unit according to claim 1, characterized in that: The cold storage device (1) comprises: a cold storage well (11) and a cold water pump (12); The cold storage well (11) is connected to the heat-using device (5) via the pipeline assembly (3) and is used to store cooling water; The water outlet end of the cold water pump (12) is connected to the heating device (2) via the pipe assembly (3) and is used to pump cooling water to the heating device (2) via the pipe assembly (3).

4. The geothermal energy storage system based on a cogeneration unit and a back pressure unit according to claim 3 is characterized in that: The cold storage device (1) further comprises: a cold water desander (13), which is arranged at the water outlet of the cold water pump (12) and is used to separate foreign particles in the cooling water.

5. The geothermal energy storage system based on a cogeneration unit and a back pressure unit according to claim 1, characterized in that: The heating device (2) comprises: a heating heat exchanger (21) and a steam trap (22); The heat supply heat exchanger (21) has a heat supply inlet, a heat supply outlet, a heat source inlet and a heat source outlet. The heat supply inlet is connected to the cold storage device (1) through the pipeline assembly (3), the heat supply outlet is connected to the heat storage device (4) through the pipeline assembly (3), the heat source inlet is connected to the first steam turbine and the second steam turbine, steam enters the heat supply heat exchanger (21) from the heat source inlet to heat the cooling water entering the heat supply heat exchanger (21) from the heat supply inlet, the steam that loses heat forms condensed water and is discharged through the heat source outlet, and the heated cooling water forms hot water and is discharged through the heat supply outlet; The steam trap (22) is arranged at the heat source outlet of the heat supply heat exchanger (21) and is used to control the discharge of the condensed water.

6. The geothermal energy storage system based on a cogeneration unit and a back pressure unit according to claim 1, characterized in that: The heat storage device (4) comprises: a heat storage well (41) and a hot water pump (42); The heat storage well (41) is connected to the heat supply device (2) via the pipeline assembly (3) and is used to store hot water; The water outlet end of the hot water pump (42) is connected to the heat-using device (5) via the pipeline assembly (3) and is used to pump hot water to the heat-using device (5) via the pipeline assembly (3).

7. The geothermal energy storage system based on a combined heat and power unit and a back pressure unit according to claim 6, characterized in that: The heat storage device (4) further comprises: a hot water desander (43), which is arranged at the water outlet of the hot water pump (42) and is used to separate foreign particles in the hot water.

8. The geothermal energy storage system based on a combined heat and power unit and a back pressure unit according to claim 1, characterized in that: The heat-using device (5) comprises: a heat exchanger (51) and a heat pump (52); The heat pump (52) is in communication with the heat exchanger (51) and is selectively in communication with the heat network system (8) for recovering heat energy of heat network return water of the heat network system (8) and for delivering heat-losing heat network return water to the heat exchanger (51); The heat exchanger (51) is connected to the cold storage device (1) and the heat storage device (4) through the pipeline assembly (3) and is used to preliminarily heat the hot water output by the heat storage device (4) to obtain the preheated return water from the heat network after the water loses heat; The heat pump (52) is also used for secondary heating and preheating return water through the recovered heat energy.

9. The geothermal energy storage system based on a combined heat and power unit and a back pressure unit according to claim 8, characterized in that: The geothermal energy storage system based on the combined heat and power unit and the back pressure unit also includes: a power device (7) connected to the heat pump (52) and used to drive the heat pump (52) to work.

10. The geothermal energy storage system based on a combined heat and power unit and a back pressure unit according to claim 1, characterized in that: The geothermal energy storage and utilization system based on the combined heat and power unit and the back pressure unit further comprises: a plurality of control valves arranged on the pipeline assembly (3), and the plurality of control valves are used to control the selective connection between the heating device (2) and the cold storage device (1) and the heat storage device (4), and the selective connection between the heating device (5) and the cold storage device (1) and the heat storage device (4).

Images