Energy storage type subway energy tunnel heat energy extraction and tunnel heat damage prevention and control system

Abstract

The utility model discloses an energy storage type metro energy tunnel heat energy extraction and tunnel heat damage prevention and control system, which belongs to the technical field of metro energy tunnels, is connected with a metro station hall air conditioner terminal system, and comprises an energy storage unit, a heat energy extraction unit, an energy release unit, a heat damage prevention and control unit, a first circulation loop, a second circulation loop and a valve group, the subway station hall air conditioner terminal system is connected with the energy release unit and the heat energy extraction unit through a second circulation loop, the heat energy extraction unit is connected with the energy storage unit and the energy release unit, the energy release unit is arranged in the energy storage unit, and the heat damage prevention and control unit is connected with the heat energy extraction unit and the energy storage unit; according to the energy storage type subway energy tunnel heat energy extraction and tunnel heat damage prevention and treatment system adopting the structure, energy conservation, consumption reduction, cost optimization and environment safety of subway operation are synchronously achieved.

Description

Technical Field

[0001] This utility model relates to the field of subway energy tunnel technology, and in particular to an energy storage subway energy tunnel thermal energy extraction and tunnel heat hazard prevention system. Background Technology

[0002] With the development of urbanization, urban populations and economies are constantly growing, leading to a continuous increase in urban energy demand. Shallow geothermal energy, due to its large reserves, wide distribution, and clean and environmentally friendly characteristics, is considered a feasible and highly competitive clean energy source. However, the application of traditional shallow geothermal energy utilization technology—buried pipe ground source heat pump technology—is often limited in cities and economically developed areas due to high drilling difficulty and large land area requirements. Subway energy tunnel technology, which combines traditional ground source heat pump technology with subway tunnel structures, has development potential and application prospects in the future development of shallow geothermal energy in cities due to its large heat transfer area and high heat extraction efficiency.

[0003] Water storage technology is a widely adopted energy-efficient technology in the field of building energy conservation. Subway station fire water tanks have large capacities, which can be fully utilized. By combining the difference between nighttime energy storage and daytime energy supply peak and off-peak electricity prices, the economic benefits of the system can be improved. At the same time, it can balance the grid load, reduce power plant investment, and purify the environment. Subway station fire water tanks have large water storage capacity and are mostly idle. If their energy storage advantages can be fully utilized, energy-saving benefits will be brought about.

[0004] Metro energy tunnel heat extraction technology is a key technology for the utilization of shallow geothermal energy in cities by combining metro tunnel structure with ground source heat pump host technology. However, as the system operates, a large amount of heat is discharged into the tunnel during the cooling season, which exacerbates the heat hazard problem in metro tunnels. This problem is particularly prominent in hot-summer and cold-winter and hot-summer and warm-winter regions of my country. Therefore, heat hazard prevention and control issues need to be considered during the implementation of metro energy tunnel technology, and corresponding heat hazard prevention and control strategies need to be proposed.

[0005] Therefore, it is necessary to develop a new type of energy storage system for subway tunnel thermal energy extraction and heat hazard prevention. Utility Model Content

[0006] The purpose of this invention is to provide an energy storage-type subway tunnel thermal energy extraction and tunnel heat hazard prevention system to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides an energy storage-type subway tunnel heat extraction and tunnel heat hazard prevention system, which is connected to the subway station hall air conditioning terminal system. The system includes an energy storage unit, a heat extraction unit, an energy release unit, a heat hazard prevention unit, a first circulation loop, a second circulation loop, and a valve group. The subway station hall air conditioning terminal system is connected to the energy release unit and the heat extraction unit respectively through the second circulation loop. The heat extraction unit is connected to both the energy storage unit and the energy release unit. The energy release unit is located within the energy storage unit. The heat hazard prevention unit is connected to both the heat extraction unit and the energy storage unit.

[0008] The valve assembly includes multiple control valves;

[0009] The energy storage unit includes a fire water tank and an energy storage pump installed on the water supply pipeline of the fire water tank;

[0010] The heat extraction unit includes a tunnel lining buried pipe, a ground source heat pump host, and a first circulating water pump, all embedded in the subway tunnel lining. The tunnel lining buried pipe is connected to the ground source heat pump host via a pipeline and is driven by the first circulating water pump to form a first circulation loop.

[0011] The energy release unit includes a coil heat exchanger installed in the fire water tank and a cooling water pump connected to the coil heat exchanger.

[0012] The heat hazard prevention unit includes an evaporative condensate unit connected to the tunnel lining buried pipe and the energy storage water pump.

[0013] The second circulation loop is equipped with a second circulating water pump and a valve. By switching the valve, the subway station hall air conditioning terminal system is connected to the coil heat exchanger to form a first cooling circuit, and the subway station hall air conditioning terminal system is connected to the heat exchange interface branch of the ground source heat pump host to form a second energy supply circuit.

[0014] Preferably, the valve group includes sixteen control valves, namely valve one to valve sixteen, and valve one to valve sixteen are solenoid valves.

[0015] Preferably, valve 2 is installed on the connecting pipeline between the cooling water pump and the coil heat exchanger, and valve 13 is installed on the connecting pipeline between the fire water tank and the energy storage water pump.

[0016] Preferably, valves five and six are provided on the first cooling circuit, and valves three and four are provided on the second power supply circuit.

[0017] Preferably, the evaporator interface of the ground source heat pump host is connected to a first branch pipe and a second branch pipe. The first branch pipe is connected to the fire water tank and the second circulation loop. Valves seven and eight are installed on the first branch pipe. The second branch pipe is connected to the tunnel lining buried pipe. Valves fourteen and fifteen are installed on the second branch pipe.

[0018] Preferably, the condenser interface of the ground source heat pump host is connected to a third branch pipe and a fourth branch pipe. The third branch pipe is connected to the first circulation loop and is equipped with valve nine and valve ten. The fourth branch pipe is connected to the second circulation loop and is equipped with valve eleven and valve twelve.

[0019] Preferably, valve sixteen is installed on the pipeline connecting the evaporative condensate unit and the tunnel lining buried pipe.

[0020] Therefore, the energy storage-type subway tunnel thermal energy extraction and tunnel heat hazard prevention system with the above-mentioned structure has the following beneficial effects:

[0021] (1) This utility model extracts shallow geothermal energy directly from the surrounding rock through heat exchange pipes buried in the tunnel lining. After conversion by the ground source heat pump system, it can meet the summer cooling and winter heating needs of the subway station hall. This method does not require additional drilling and does not occupy ground space. It is particularly suitable for densely built-up urban areas and overcomes the application limitations of traditional ground source heat pump systems.

[0022] (2) This utility model integrates a large fire water tank as an energy storage device, which can store cold energy (or heat energy) during off-peak electricity price periods at night and release it during peak electricity price periods during the day, significantly reducing operating costs. This "peak shifting and valley filling" operation mode not only saves costs for users, but also helps to balance the grid load and improve the overall efficiency of energy utilization;

[0023] (3) The heat hazard prevention unit integrated in this utility model can actively transfer excess heat in the tunnel to an energy storage tank for storage or other treatment when needed, thereby avoiding the long-term accumulation of heat in the surrounding rock of the tunnel and the resulting continuous rise in temperature. This ensures the comfort and safety of the subway operating environment and solves a key obstacle in the promotion of subway energy tunnel technology;

[0024] (4) This utility model organically integrates multiple functions such as heat extraction, energy storage, on-demand energy release, and heat hazard prevention into one system. Through optimized pipeline and valve group design, the working mode can be flexibly switched according to different energy demands and electricity price periods, realizing the coordinated control and optimization of the heating and cooling demand of subway stations and the thermal environment management of tunnels.

[0025] The technical solutions in the embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an energy storage subway tunnel thermal energy extraction and tunnel heat hazard prevention system according to the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the energy storage subway tunnel thermal energy extraction and tunnel heat hazard prevention system under off-peak electricity cold storage mode.

[0028] Figure 3 This is a schematic diagram of the structure of the energy storage subway tunnel thermal energy extraction and tunnel heat hazard prevention system under peak electrical release cooling mode.

[0029] Figure 4 This is a schematic diagram of the structure of a heat pump cooling mode of an energy storage subway tunnel heat extraction and tunnel heat hazard prevention system according to the present invention.

[0030] Figure 5 This is a schematic diagram of the structure of a heat pump heating mode for a storage-type subway energy tunnel heat extraction and tunnel heat hazard prevention system according to the present invention.

[0031] Figure 6 This is a schematic diagram of the structure of a thermal energy extraction and tunnel thermal hazard prevention system for a storage-type subway tunnel under the thermal hazard control mode of this utility model.

[0032] Figure 7 This is a schematic diagram of the fire-fighting water tank of a storage-type subway energy tunnel heat extraction and tunnel heat hazard prevention system according to the present invention.

[0033] Attached reference numerals: 1. Valve 1; 2. Valve 2; 3. Valve 3; 4. Valve 4; 5. Valve 5; 6. Valve 6; 7. Valve 7; 8. Valve 8; 9. Valve 9; 10. Valve 10; 11. Valve 11; 12. Valve 12; 13. Valve 13; 14. Valve 14; 15. Valve 15; 16. Valve 16; 17. First circulating water pump; 18. Tunnel lining buried pipe; 19. Cooling water pump; 20. Fire water tank; 21. Second circulating water pump; 22. Subway station hall air conditioning terminal system; 23. Ground source heat pump; 24. Evaporator; 25. Condenser 1; 26. Compressor 1; 27. Energy storage water pump; 28. Evaporative condensing chiller unit; 29. ​​Condenser 2; 30. Cooler; 31. Compressor 2; 32. Coil heat exchanger. Detailed Implementation

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0035] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] Example

[0037] like Figure 1 As shown, a storage-type subway energy tunnel heat extraction and tunnel heat hazard prevention system is connected to the subway station hall air conditioning terminal system 22. It includes an energy storage unit, a heat extraction unit, an energy release unit, a heat hazard prevention unit, a first circulation loop, a second circulation loop, and a valve group. The subway station hall air conditioning terminal system 22 is connected to the energy release unit and the heat extraction unit through the second circulation loop. The heat extraction unit is connected to the energy storage unit and the energy release unit. The energy release unit is located inside the energy storage unit. The heat hazard prevention unit is connected to the heat extraction unit and the energy storage unit.

[0038] The valve assembly includes sixteen control valves, namely valve 1 to valve 16, which are solenoid valves.

[0039] The energy storage unit includes a fire water tank 20 and an energy storage pump 27 installed on the water supply pipeline of the fire water tank 20. The fire water tank 20 is an existing water tank in the subway station used for fire protection, which has both fire protection and cold storage functions. In the cold storage mode, it serves as a cold storage water tank. A valve 1313 is installed on the connecting pipeline between the fire water tank 20 and the energy storage pump 27.

[0040] The heat extraction unit includes a tunnel lining buried pipe 18, a ground source heat pump 23 main unit, and a first circulating water pump 17, all embedded in the subway tunnel lining. The tunnel lining buried pipe 18 and the condenser interface of the ground source heat pump 23 main unit are connected by a pipeline to form a first circulation loop. The first circulating water pump 17 is installed on the first circulation loop to drive the circulating medium to flow between the tunnel surrounding rock and the ground source heat pump 23 main unit to extract or release heat. The ground source heat pump 23 main unit includes an evaporator 24, a condenser 25, and a compressor 26.

[0041] The energy release unit includes a coil heat exchanger 32 installed in the fire water tank 20 and a cooling water pump 19 connected to the coil heat exchanger 32. The coil heat exchanger 32 is submerged in the water in the fire water tank 20 for heat exchange of the tank water. The inlet of the cooling water pump 19 is connected to the fire water tank 20, and the outlet is connected to the coil heat exchanger 32 through a pipeline. A valve 2 is installed on the connecting pipeline between the cooling water pump 19 and the coil heat exchanger 32.

[0042] The heat damage prevention unit includes an evaporative condensate unit connected to the tunnel lining buried pipe 18 and the energy storage water pump 27; the evaporative condensate unit includes a second condenser 29, a cooler 30 and a second compressor 31, which are used to efficiently transfer heat.

[0043] The second circulation loop is equipped with a second circulating water pump 21 and valve 1. The second circulation loop forms an independent loop serving the air conditioning load of the subway station hall. By switching the valve 1, the air conditioning terminal system 22 of the subway station hall is connected to the coil heat exchanger 32 to form the first cooling loop. The air conditioning terminal system 22 of the subway station hall is connected to the heat exchange interface branch of the ground source heat pump 23 to form the second energy supply loop.

[0044] The first cooling circuit is equipped with valve 5 and valve 6, and the second power supply circuit is equipped with valve 3 and valve 4.

[0045] The evaporator 24 interface of the ground source heat pump 23 is connected to a first branch pipe and a second branch pipe. The first branch pipe is connected to the fire water tank 20 and the second circulation loop. The first branch pipe is equipped with valve 7 and valve 8. The second branch pipe is connected to the tunnel lining buried pipe 18. The second branch pipe is equipped with valve 14 and valve 15.

[0046] The condenser interface of the ground source heat pump 23 main unit is connected to a third branch pipe and a fourth branch pipe. The third branch pipe is connected to the first circulation loop and is equipped with valve 9 and valve 10. The fourth branch pipe is connected to the second circulation loop and is equipped with valve 11 and valve 12.

[0047] A valve 16 is installed on the pipeline connecting the evaporative condensate unit and the tunnel lining buried pipe 18.

[0048] like Figure 2As shown, during off-peak electricity hours at night, the system described in this embodiment is in cold storage mode. In this mode, valves 7, 8, 9, 10, and 13 are opened, while the remaining valves are closed. Simultaneously, the energy storage pump 27 and the first circulating pump 17 are started. In this mode, the ground source heat pump 23 starts and operates in cooling mode. The circulating medium in the first circulation loop absorbs heat from the surrounding rock in the tunnel lining buried pipe 18 and releases heat by flowing through the condenser 25 of the ground source heat pump 23. At the same time, the water in the fire water tank 20, driven by the energy storage pump 27, flows through the evaporator 24 of the ground source heat pump 23. After absorbing heat, its temperature decreases, forming cold water that returns and is stored in the fire water tank 20. In this way, cheap electricity at night is converted into cooling energy and stored in the water tank.

[0049] like Figure 3 As shown, during peak electricity consumption periods in the daytime, the system can switch to a cooling release mode. In this mode, valves 1, 2, 5, 6, and 13 are opened, while the remaining valves are closed. Simultaneously, the cooling release water pump 19 and the second circulating water pump 21 are started. In this mode, the cold water stored in the fire water tank 20 flows through the coil heat exchanger 32 under the drive of the cooling release water pump 19. Simultaneously, the circulating medium in the second circulation loop flows through the coil heat exchanger 32 under the drive of the second circulating water pump 21 and is cooled by it, subsequently providing cooling capacity to the subway station concourse air conditioning terminal system 22. This process directly utilizes the cold energy stored overnight, avoiding the need to operate high-power main units during peak electricity consumption periods.

[0050] like Figure 4 and Figure 5 As shown, when the cooling capacity in the cold storage tank is insufficient or when geothermal energy needs to be directly utilized, the system can operate in a direct heat pump energy supply mode; in this mode, valves 1, 3, and 4 need to be opened, and different valve combinations can be opened according to different needs:

[0051] Cooling mode such as Figure 4 As shown, valves 7, 8, 9, and 10 are opened separately; at this time, the ground source heat pump 23 is in cooling mode, absorbing heat from the surrounding rock of the tunnel through the first circulation loop, and supplying cooling to the air conditioning terminal system 22 of the subway station hall through the second circulation loop.

[0052] Heating modes such as Figure 5 As shown, valves 11, 12, 14, and 15 are opened additionally. At this time, the ground source heat pump 23 operates in heating mode, absorbing heat from the surrounding rock of the tunnel through the first circulation loop and supplying heat to the air conditioning terminal system 22 of the subway station hall through the second circulation loop.

[0053] In both states, the first circulating water pump 17 and the second circulating water pump 21 must be started simultaneously.

[0054] like Figure 6 As shown, when it is necessary to actively reduce the temperature of the tunnel surrounding rock to prevent heat damage, the system can activate the heat damage control mode. In this mode, valves 13 and 16 are opened, and the evaporative condensing chiller unit 28 is started simultaneously. In this mode, the high-temperature water from the tunnel in the first circulation loop has its heat extracted in the evaporator of the evaporative condensing chiller unit 28, and after cooling, it flows back to the tunnel to cool the surrounding rock. The extracted heat is then transferred to the flowing fire water tank in the condenser 29 and cooler 30 of the evaporative condensing chiller unit 28, or dissipated by other means.

[0055] like Figure 7 As shown, this is a preferred internal structure of the fire water tank 20 in this embodiment. The coil heat exchanger 32 is arranged in the water tank in the form of a coil. In order to further enhance heat exchange and prevent temperature stratification, diffusers can be installed at the bottom and top of the water tank to promote uniform mixing of the water.

[0056] Therefore, this utility model adopts the above-mentioned structure as an energy storage type subway energy tunnel thermal energy extraction and tunnel heat hazard prevention system. Through innovative system construction, it can efficiently extract and utilize shallow geothermal energy in subway tunnels to meet the station's heating and cooling needs. At the same time, it can cleverly utilize existing fire water tanks to achieve cross-time period energy storage and release to improve economic efficiency. It can also proactively prevent tunnel heat hazards that may be aggravated by system operation, thereby simultaneously achieving energy saving, cost optimization, and environmental safety in subway operation.

[0057] Finally, it should be noted that the above embodiments are only preferred embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be covered within the protection scope of the present utility model.

Claims

1. A storage-type subway energy tunnel heat extraction and tunnel heat hazard prevention system, connected to the subway station hall air conditioning terminal system, characterized in that: It includes an energy storage unit, a heat extraction unit, an energy release unit, a heat hazard prevention unit, a first circulation loop, a second circulation loop, and a valve group; the subway station hall air conditioning terminal system is connected to the energy release unit and the heat extraction unit respectively through the second circulation loop, the heat extraction unit is connected to the energy storage unit and the energy release unit respectively, the energy release unit is disposed in the energy storage unit, and the heat hazard prevention unit is connected to the heat extraction unit and the energy storage unit respectively; The valve assembly includes multiple control valves; The energy storage unit includes a fire water tank and an energy storage pump installed on the water supply pipeline of the fire water tank; The heat extraction unit includes a tunnel lining buried pipe, a ground source heat pump host, and a first circulating water pump, all embedded in the subway tunnel lining. The tunnel lining buried pipe is connected to the ground source heat pump host via a pipeline and is driven by the first circulating water pump to form a first circulation loop. The energy release unit includes a coil heat exchanger installed in the fire water tank and a cooling water pump connected to the coil heat exchanger. The heat hazard prevention unit includes an evaporative condensate unit connected to the tunnel lining buried pipe and the energy storage water pump. The second circulation loop is equipped with a second circulating water pump and a valve. By switching the valve, the subway station hall air conditioning terminal system is connected to the coil heat exchanger to form a first cooling circuit, and the subway station hall air conditioning terminal system is connected to the heat exchange interface branch of the ground source heat pump host to form a second energy supply circuit.

2. The energy storage-type subway tunnel thermal energy extraction and tunnel heat hazard prevention system according to claim 1, characterized in that: The valve group includes sixteen control valves, namely valve one to valve sixteen, and valve one to valve sixteen are solenoid valves.

3. The energy storage-type subway tunnel thermal energy extraction and tunnel heat hazard prevention system according to claim 2, characterized in that: Valve 2 is installed on the connecting pipeline between the cooling water pump and the coil heat exchanger, and valve 13 is installed on the connecting pipeline between the fire water tank and the energy storage water pump.

4. The energy storage-type subway tunnel thermal energy extraction and tunnel heat hazard prevention system according to claim 2, characterized in that: The first cooling circuit is equipped with valves five and six, and the second power supply circuit is equipped with valves three and four.

5. The energy storage-type subway tunnel thermal energy extraction and tunnel heat hazard prevention system according to claim 2, characterized in that: The evaporator interface of the ground source heat pump unit is connected to a first branch pipe and a second branch pipe. The first branch pipe is connected to the fire water tank and the second circulation loop. Valves seven and eight are installed on the first branch pipe. The second branch pipe is connected to the tunnel lining buried pipe. Valves fourteen and fifteen are installed on the second branch pipe.

6. The energy storage-type subway tunnel thermal energy extraction and tunnel heat hazard prevention system according to claim 2, characterized in that: The condenser interface of the ground source heat pump unit is connected to a third branch pipe and a fourth branch pipe. The third branch pipe is connected to the first circulation loop and is equipped with valve nine and valve ten. The fourth branch pipe is connected to the second circulation loop and is equipped with valve eleven and valve twelve.

7. The energy storage-type subway tunnel thermal energy extraction and tunnel heat hazard prevention system according to claim 2, characterized in that: Valve Sixteen is installed on the pipeline connecting the evaporative condensate unit and the tunnel lining buried pipe.

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