Mine goaf geothermal energy storage energy collaborative working face cooling system and control method

Abstract

The application discloses a kind of mine goaf geothermal energy storage collaborative working face cooling system and control method, the system utilizes underground goaf to set goaf energy storage unit, the geothermal energy of geothermal exploitation well is used as the driving heat source of absorption refrigeration unit, coupling high-temperature heat pump unit waste heat recovery, goaf energy storage unit carries out energy storage, and multi-stage heat exchange unit carries out energy distribution, and geothermal energy is driven absorption refrigeration unit refrigeration by primary heat exchange module, working face is cooled by original mine air conditioning chilled water pipe network, geothermal tail water is heated by the waste heat of high-temperature heat pump unit by multi-stage heat exchange and completes heating, and is stored in heat storage goaf for system peak shaving, high-temperature heat pump unit recovers the gushing waste heat of working face gushing main pipe and stores in cold storage goaf to compensate cold, geothermal recharging well absorbs system waste heat, renewable energy is simultaneously absorbed, the cascade utilization of geothermal energy, gushing waste heat, goaf energy storage and working face cooling depth collaboration is realized.

Description

Technical Field

[0001] This invention relates to the field of mine energy utilization and working face cooling technology, and in particular to a working face cooling system and control method for geothermal energy storage in mine goaf. Background Technology

[0002] Goaf storage is a novel energy storage method that utilizes the voids (ghost areas) left after mining operations to store energy. Through compressed air storage, liquid air storage, or other energy storage technologies, energy can be stored in the goaf in physical or chemical forms and released when needed. This technology utilizes existing abandoned space in mining areas, offering lower construction costs and higher space utilization efficiency compared to traditional energy storage methods, making it particularly suitable for energy storage and renewable energy dispatch.

[0003] The biggest advantage of goaf energy storage lies in its ability to fully utilize abandoned spaces in mines, avoiding the high costs and complex construction required for building new underground energy storage facilities, while also reducing environmental damage and land waste. Furthermore, this energy storage method is highly compatible with the intermittent nature of renewable energy sources, effectively addressing the volatility issues of wind and solar power and ensuring grid stability. Compared to traditional compressed air energy storage, the readily available cavities provided by goaf areas make energy storage systems more economical and convenient, and offer significant expansion potential.

[0004] Furthermore, mine working faces are frequently plagued by heat hazards. High temperatures not only affect the health of workers but can also reduce equipment operating efficiency and create safety risks. Traditional cooling methods for working faces rely heavily on direct cooling from air conditioning units, which are energy-intensive and subject to grid load limitations, often resulting in insufficient cooling during peak electricity consumption periods. Meanwhile, goaf areas formed after mining are often abandoned, leading to wasted space resources. Traditional geothermal utilization methods lack efficient energy storage and coordinated dispatch mechanisms, making it difficult to adapt to the dynamic cooling needs of working faces and the seasonal fluctuations in energy supply and demand in mining areas. The recovery and utilization rate of low-temperature waste heat from mine and working face water inflows is low, and renewable energy sources such as wind and solar power are volatile, prone to curtailment, and unable to effectively provide stable energy support for working face cooling.

[0005] Therefore, there is an urgent need for a system that integrates the spatial resources of mining subsidence areas, geothermal energy storage, waste heat recovery, and synergistic cooling functions to solve the problems of high energy consumption, low energy utilization efficiency, and supply-demand mismatch in traditional cooling methods. Summary of the Invention

[0006] To address the problems of high energy consumption for cooling in underground air conditioning systems, low efficiency of waste heat energy utilization from inrush water, mismatch between supply and demand time, and insufficient absorption of inrush water, this invention proposes a geothermal energy storage-coordinated working face cooling system for mine goaf areas, aiming to utilize existing resources in mine goaf areas to efficiently cool the working face.

[0007] To address the aforementioned technical problems, the first aspect of this invention proposes a cooling system for a geothermal energy storage-assisted working face in a mine goaf, comprising:

[0008] A geothermal unit includes geothermal extraction wells and geothermal reinjection wells;

[0009] A multi-stage heat exchange unit includes a primary heat exchange module, an intermediate heat exchange module and a final heat exchange module connected in series on the primary side. The primary side of the primary heat exchange module is connected to the geothermal extraction well, and the secondary side of the intermediate heat exchange module is connected to the heating network of the civil buildings in the mining area.

[0010] A high-temperature heat pump unit includes a high-temperature heat pump unit, wherein the evaporator inlet of the high-temperature heat pump unit is connected to the main water supply pipe of the working surface, the condenser of the high-temperature heat pump unit is connected to the secondary side of the final stage heat exchange module, and the high-temperature heat pump unit is connected to the power supply terminal of the renewable energy unit.

[0011] The goaf energy storage unit includes a thermal goaf storage area and a cold goaf storage area. The inlet of the thermal goaf storage area is connected to the primary side outlet of the final stage heat exchange module. The outlet of the thermal goaf storage area is connected to the connecting pipeline between the geothermal mining well and the primary side of the primary heat exchange module via a first control valve. The inlet of the cold goaf storage area is connected to the evaporator outlet of the high-temperature heat pump unit. The outlet of the cold goaf storage area is connected to the inlet of the mine's original air conditioning chilled water pipeline network. The outlet of the mine's original air conditioning chilled water pipeline network is connected to the geothermal reinjection well via a seventh control valve. The geothermal reinjection well is also connected to the main water inflow pipe of the working face.

[0012] An absorption refrigeration unit includes an absorption chiller unit, wherein the generator of the absorption chiller unit is connected to the secondary side of the primary heat exchange module, and the evaporator of the absorption chiller unit is connected to the existing chilled water pipeline network of the mine's air conditioning system.

[0013] In some embodiments, a second control valve is also included, which is disposed on the primary side connection pipeline between the primary heat exchange module and the intermediate heat exchange module, and is used to control the unidirectional flow of geothermal fluid from the primary heat exchange module to the intermediate heat exchange module and to control its on / off state.

[0014] In some embodiments, a third control valve is also included, which is installed on the primary side connection pipeline between the intermediate heat exchange module and the final heat exchange module, and is used to control the unidirectional flow of geothermal fluid from the intermediate heat exchange module to the final heat exchange module and to control its on / off state.

[0015] In some embodiments, a fourth control valve is also included, which is installed on the primary side connection pipeline between the primary heat exchange module and the final heat exchange module, and is used to control the unidirectional flow of geothermal fluid from the primary heat exchange module to the final heat exchange module and to control its on / off state.

[0016] In some embodiments, a fifth control valve is also included, which is installed on the connecting pipeline between the main water inflow pipe of the working face and the evaporator inlet of the high-temperature heat pump unit, and is used to control the unidirectional flow of water from the main water inflow pipe of the working face to the evaporator of the high-temperature heat pump unit and to control its on / off state.

[0017] In some embodiments, a sixth control valve is also included, which is located on the connecting pipeline between the working face water inflow main and the geothermal reinjection well and is upstream of the fifth control valve. The sixth control valve is used to control the unidirectional flow of working face water from the working face water inflow main to the geothermal reinjection well and to control its on / off state.

[0018] The second aspect of this invention proposes a control method for the aforementioned cooling system of a geothermal energy storage co-working face in a mine goaf, comprising a winter combined cooling, heating, and power supply mode and a summer combined cooling, heating, and power supply mode, wherein...

[0019] The winter heating, cooling, and heat supply mode includes: opening the first control valve, the second control valve, the third control valve, the fifth control valve, the sixth control valve, and the seventh control valve, and closing the fourth control valve;

[0020] The summer combined cooling and heating mode includes: opening the first control valve, the fourth control valve, the fifth control valve, the sixth control valve, and the seventh control valve, and closing the second control valve and the third control valve.

[0021] The beneficial effects of this invention are as follows: By utilizing underground goaf areas to set up goaf energy storage units, the geothermal energy from geothermal mining wells is used as the driving heat source for absorption chillers. This is coupled with high-temperature heat pump units for waste heat recovery, goaf energy storage units for energy storage, and multi-stage heat exchange units for energy distribution, constructing an integrated energy flow system that achieves multi-stage energy recovery, storage, and utilization. Furthermore, geothermal energy drives absorption chillers for cooling via primary heat exchange modules, and provides cooling to the working face through the existing mine air conditioning chilled water network. Geothermal tailwater undergoes multi-stage heat exchange for heating or is heated by the waste heat from high-temperature heat pump units, and then stored in the thermal storage goaf area for system peak shaving. The high-temperature heat pump units recover waste heat from the working face's main water inflow pipe to create a medium-temperature cold source, which is stored in the cold storage goaf area for supplemental cooling. Geothermal reinjection wells absorb system waste heat and simultaneously absorb renewable energy, achieving tiered utilization of geothermal energy and waste water inflow, and deep synergy between goaf energy storage and working face cooling. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the structure of the geothermal energy storage and working face cooling system in the goaf area of ​​a mine, as disclosed in Embodiment 1 of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer and more explicit, the content of this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to this invention are shown in the accompanying drawings, not all of them.

[0024] Example 1

[0025] This embodiment proposes a geothermal energy storage and working face cooling system for goaf areas in mines, such as... Figure 1 As shown, it includes:

[0026] The geothermal unit includes geothermal extraction well 1 and geothermal reinjection well 2. It should be noted that in this scheme, geothermal extraction well 1 and geothermal reinjection well 2 are not two separate mines, but rather two functional ends of the mine geothermal utilization system, which together form a closed-loop system for geothermal energy utilization and mine heat hazard mitigation.

[0027] The multi-stage heat exchange unit includes a primary heat exchange module 3, an intermediate heat exchange module 4, and a final heat exchange module 5 connected in series on the primary side. The primary side of the primary heat exchange module 3 is connected to the geothermal extraction well 1, and the secondary side of the intermediate heat exchange module 4 is connected to the heating network 6 for the civil buildings in the mining area. In this system, the heating network 6 for the civil buildings in the mining area has no cooling function.

[0028] The high-temperature heat pump unit includes a high-temperature heat pump unit 7. The evaporator inlet of the high-temperature heat pump unit 7 is connected to the working surface water inlet pipe 8. The condenser of the high-temperature heat pump unit 7 is connected to the secondary side of the final heat exchange module 5. The high-temperature heat pump unit 7 is connected to the power supply end of the renewable energy unit 9 (curtailed wind, curtailed solar or off-peak electricity).

[0029] The goaf energy storage unit includes a thermal goaf 10 and a cold goaf 11. The inlet of the thermal goaf 10 is connected to the primary side outlet of the final heat exchange module 5. The outlet of the thermal goaf 10 is connected to the connecting pipeline between the geothermal mining well 1 and the primary side of the primary heat exchange module 3 via the first control valve v1. The inlet of the cold goaf 11 is connected to the evaporator outlet of the high-temperature heat pump unit 7. The outlet of the cold goaf 11 is connected to the inlet of the mine's original air conditioning chilled water pipeline network 12. The outlet of the mine's original air conditioning chilled water pipeline network 12 is connected to the geothermal reinjection well 2 via the seventh control valve v7. The geothermal reinjection well 2 is also connected to the working face water inflow main 8. In this scheme, the inlet of the geothermal storage goaf 10 is connected to the primary side outlet of the final stage heat exchange module 5, and is used to store the geothermal tailwater heated by the final stage heat exchange module 5. Its outlet is connected to the connecting pipeline between the geothermal extraction well 1 and the primary side of the primary heat exchange module 3 via the first control valve v1, and can release the stored heat energy as a peak heat source for daytime cooling according to the system operation requirements. The inlet of the cold storage goaf 11 is connected to the evaporator outlet of the high-temperature heat pump unit 7, and is used to store the medium-temperature cold source prepared by the unit after recovering the waste heat of the inrush water. The heat of the inrush water is transferred by the high-temperature heat pump unit 7 to the final stage heat exchange module 5 (used for the geothermal extraction tailwater). (The water is heated) and then sent to the thermal storage goaf 10 for storage as a heat source reserve for the system. Furthermore, the outlet of the cold storage goaf 11 is connected to the mine's original air conditioning chilled water pipeline 12 to supplement the working face with a cold source. The outlet of the mine's original air conditioning chilled water pipeline 12 is connected to the geothermal reinjection well 2 via the seventh control valve v7 to discharge the high-temperature hot water in the mine's original air conditioning chilled water pipeline 12 (used to cool the working face, and the temperature rises). The geothermal reinjection well 2 is also directly connected to the working face water inflow main 8. While supplying cooling, the cold storage goaf 11 also realizes the direct consumption of the working face water inflow through a one-in-one-out method.

[0030] The absorption chiller unit includes an absorption chiller 13. The generator of the absorption chiller 13 is connected to the secondary side of the primary heat exchange module 3, and the evaporator of the absorption chiller 13 is connected to the existing air conditioning chilled water pipeline network 12 in the mine. In this scheme, the absorption chiller 13 is the core component for providing a low-temperature cold source for the mining face. The generator of the absorption chiller 13 is connected to the secondary side of the primary heat exchange module 3, using the geothermal energy after heat exchange in the primary heat exchange module 3 as the driving heat source to complete the conversion of heat energy into cold energy. In addition, the evaporator of the unit is connected to the existing air conditioning chilled water pipeline network 12 in the mine, and the prepared low-temperature cold source is directly transported to the mining face through this pipeline network to provide a basic low-temperature cold source for the working face. Together with the medium-temperature cold source provided by the cold storage goaf area 11, it forms a dual cold source to achieve synergistic cooling of the working face.

[0031] In this embodiment, by setting up a goaf energy storage unit in the underground goaf area, the geothermal energy of the geothermal extraction well 1 is used as the driving heat source of the absorption chiller unit 13. The waste heat recovery of the high-temperature heat pump unit 7, the goaf energy storage unit for energy storage, and the multi-stage heat exchange unit for energy distribution are coupled to build an integrated energy flow system and realize multi-stage energy recovery, storage and utilization. Furthermore, geothermal energy drives absorption chiller unit 13 for cooling via primary heat exchange module 3, and provides cooling to the working face through the mine's existing air conditioning chilled water network 12. Geothermal tailwater is used for heating through multi-stage heat exchange or heated by the waste heat of high-temperature heat pump unit 7, and then stored in the thermal storage goaf area 10 for system peak shaving. High-temperature heat pump unit 7 recovers the waste heat of the water inflow main pipe 8 of the working face to produce a medium-temperature cold source, which is stored in the cold storage goaf area 11 for supplemental cooling. Geothermal reinjection well 2 absorbs the system's waste heat and simultaneously absorbs renewable energy, realizing the tiered utilization of geothermal energy and waste heat of water inflow, as well as the deep synergy between goaf energy storage and working face cooling.

[0032] It needs to be explained that, Figure 1 The temperature of the flowing medium between each unit component marked in the figure is not a fixed operating value, but a general temperature to interpret the thermal energy level of the medium between each unit. The actual temperature will fluctuate depending on the geothermal resources, wind curtailment, solar curtailment or off-peak electricity input in the mining area.

[0033] Furthermore, a second control valve v2 is included. The second control valve v2 is installed on the primary side connecting pipe between the primary heat exchange module 3 and the intermediate heat exchange module 4, and is used to control the unidirectional flow and on / off state of the geothermal fluid from the primary heat exchange module 3 to the intermediate heat exchange module 4. In the above preferred embodiment, by installing the second control valve v2 on the primary side connecting pipe between the primary heat exchange module 3 and the intermediate heat exchange module 4, the unidirectional flow and on / off state of the geothermal fluid from the primary heat exchange module 3 to the intermediate heat exchange module 4 are controlled, providing hardware on / off control for the heating path of the heating network 6 for civil buildings in the mining area. This is the core control component for realizing the switching of the system's seasonal operation mode, ensuring the effective opening of the winter heating path. See Embodiment Two for the specific principle.

[0034] Furthermore, a third control valve v3 is included. This third control valve v3 is installed on the primary side connection pipeline between the intermediate heat exchange module 4 and the final heat exchange module 5, and is used to control the unidirectional flow and on / off state of the geothermal fluid from the intermediate heat exchange module 4 to the final heat exchange module 5. In the above preferred embodiment, by installing the third control valve v3 on the primary side connection pipeline between the intermediate heat exchange module 4 and the final heat exchange module 5, the unidirectional flow and on / off state of the geothermal fluid from the intermediate heat exchange module 4 to the final heat exchange module 5 are controlled. This, in conjunction with the second control valve v2, forms a series path control for mine heating, ensuring that the geothermal fluid can flow sequentially through the three heat exchange modules in winter, completing the dual energy distribution of heating and geothermal tailwater heating. See Embodiment Two for the specific principle.

[0035] Furthermore, a fourth control valve v4 is included. This fourth control valve v4 is installed on the primary side connection pipeline between the primary heat exchange module 3 and the final heat exchange module 5, and is used to control the unidirectional flow and on / off state of the geothermal fluid from the primary heat exchange module 3 to the final heat exchange module 5. In the above preferred embodiment, by installing the fourth control valve v4 on the primary side connection pipeline between the primary heat exchange module 3 and the final heat exchange module 5, the unidirectional direct flow and on / off state of the geothermal fluid from the primary heat exchange module 3 to the final heat exchange module 5 are controlled. In summer, opening this valve allows the geothermal fluid to bypass the intermediate heat exchange module 4, avoiding ineffective heat exchange when there is no heating demand, reducing heat loss of the geothermal fluid, improving the heating efficiency of the final heat exchange module 5 for the geothermal tailwater, and ensuring the energy storage effect of the geothermal storage goaf 10. See Embodiment Two for the specific principle.

[0036] Furthermore, a fifth control valve v5 is included. This fifth control valve v5 is installed on the connecting pipe between the main water supply pipe 8 at the working face and the evaporator inlet of the high-temperature heat pump unit 7. It is used to control the unidirectional flow and on / off state of the water supply from the main water supply pipe 8 to the evaporator of the high-temperature heat pump unit 7. In the above preferred embodiment, by installing the fifth control valve v5 between the main water supply pipe 8 at the working face and the evaporator inlet of the high-temperature heat pump unit 7, the unidirectional flow and on / off state of the water supply from the working face to the evaporator of the high-temperature heat pump unit 7 are controlled, precisely regulating the inlet volume of the waste heat recovery water supply. This ensures the stability and controllability of the waste heat recovery from the high-temperature heat pump unit 7 and avoids fluctuations in the water supply flow rate affecting the preparation efficiency of medium-temperature chilled water. See Example 2 for the specific principle.

[0037] Furthermore, a sixth control valve v6 is included. The sixth control valve v6 is located on the connecting pipeline between the working face water inlet main 8 and the geothermal reinjection well 2, upstream of the fifth control valve v5. It is used to control the unidirectional flow and on / off of the working face water from the working face water inlet main 8 to the geothermal reinjection well 2. In the above preferred embodiment, by setting the sixth control valve v6 between the working face water inlet main 8 and the geothermal reinjection well 2 and upstream of the fifth control valve v5, the unidirectional flow and on / off of the working face water to the geothermal reinjection well 2 are controlled. In conjunction with the fifth control valve v5, the diversion control of waste heat recovery and direct heat hazard dissipation of the working face water is achieved. The water treatment method can be flexibly adjusted according to the system operating conditions, improving the flexibility of water hazard dissipation. See Embodiment 2 for the specific principle.

[0038] Example 2

[0039] This embodiment proposes a control method for the cooling system of the goaf geothermal energy storage co-working face in the mine described in Embodiment 1, including a winter combined cooling, heating and heat supply mode and a summer combined cooling and heat supply mode, as shown in Table 1 below.

[0040] Table 1. Operating modes and corresponding control valve opening / closing states

[0041] The winter combined cooling, heating, and power supply mode includes: opening the first control valve v1, the second control valve v2, the third control valve v3, the fifth control valve v5, the sixth control valve v6, and the seventh control valve v7, and closing the fourth control valve v4. In this mode, geothermal fluid flows from the geothermal extraction well 1 into the primary heat exchange module 3, then through the opened second control valve v2 into the intermediate heat exchange module 4, providing a heating source for the heating network 6 of the mining area's civil buildings, and then through the opened third control valve v3 into the final heat exchange module 5; the water flowing from the working face is diverted through the sixth control valve v6 and flows into the high-temperature heat pump unit 7 through the fifth control valve v5. The unit recovers the waste heat from the water flow to prepare a medium-temperature cold source for storage in the cold storage goaf 11, while simultaneously releasing the waste heat to the final heat exchange module 5. The geothermal tailwater is heated and then stored in the thermal storage goaf 10. The thermal storage goaf 10 can supplement the system with peak-shaving heat source through the first control valve v1. The cold storage goaf 11 and the absorption chiller unit 13 form a dual cold source to cool the working face. The high-temperature hot water generated by the cold storage goaf 11 flows into the geothermal reinjection well 2 through the seventh control valve v7. The water inrush from the working face can also flow directly into the geothermal reinjection well 2 for consumption, thus simultaneously realizing mine heating, working face cooling, geothermal energy storage and water inrush heat hazard consumption.

[0042] The summer combined cooling and heating mode includes: opening the first control valve v1, the fourth control valve v4, the fifth control valve v5, the sixth control valve v6, and the seventh control valve v7, and closing the second control valve v2 and the third control valve v3. In this mode, geothermal fluid flows directly from the primary heat exchange module 3 into the final heat exchange module 5 via the opened fourth control valve v4, skipping the intermediate heat exchange module 4 to avoid ineffective heat exchange when there is no heating demand, thus reducing the heat loss of geothermal fluid. The water flowing from the working face still flows into the high-temperature heat pump unit 7 through the sixth control valve v6 and the fifth control valve v5 to complete the waste heat recovery. The medium-temperature cold source generated by the unit and the low-temperature cold source of the absorption chiller unit 13 continue to provide cooling for the working face. The waste heat of the high-temperature heat pump unit 7 is still used to heat the geothermal tailwater of the final heat exchange module 5. The geothermal tailwater is stored in the thermal storage goaf 10 and peak shaving is achieved through the first control valve v1. The high-temperature hot water of the cold storage goaf 11 and the water flowing from the working face are still consumed through the geothermal reinjection well 2. While retaining the core functions of working face cooling and geothermal energy storage, the overall energy utilization efficiency of the system is improved.

[0043] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A cooling system for a working face in conjunction with geothermal energy storage in a mine goaf, characterized in that, include: A geothermal unit includes geothermal extraction wells and geothermal reinjection wells; A multi-stage heat exchange unit includes a primary heat exchange module, an intermediate heat exchange module and a final heat exchange module connected in series on the primary side. The primary side of the primary heat exchange module is connected to the geothermal extraction well, and the secondary side of the intermediate heat exchange module is connected to the heating network of the civil buildings in the mining area. A high-temperature heat pump unit includes a high-temperature heat pump unit, wherein the evaporator inlet of the high-temperature heat pump unit is connected to the main water supply pipe of the working surface, the condenser of the high-temperature heat pump unit is connected to the secondary side of the final stage heat exchange module, and the high-temperature heat pump unit is connected to the power supply terminal of the renewable energy unit. The goaf energy storage unit includes a thermal goaf storage area and a cold goaf storage area. The inlet of the thermal goaf storage area is connected to the primary side outlet of the final stage heat exchange module. The outlet of the thermal goaf storage area is connected to the connecting pipeline between the geothermal mining well and the primary side of the primary heat exchange module via a first control valve. The inlet of the cold goaf storage area is connected to the evaporator outlet of the high-temperature heat pump unit. The outlet of the cold goaf storage area is connected to the inlet of the mine's original air conditioning chilled water pipeline network. The outlet of the mine's original air conditioning chilled water pipeline network is connected to the geothermal reinjection well via a seventh control valve. The geothermal reinjection well is also connected to the main water inflow pipe of the working face. An absorption refrigeration unit includes an absorption chiller unit, wherein the generator of the absorption chiller unit is connected to the secondary side of the primary heat exchange module, and the evaporator of the absorption chiller unit is connected to the existing chilled water pipeline network of the mine's air conditioning system.

2. The geothermal energy storage and working face cooling system for goaf areas as described in claim 1, characterized in that, It also includes a second control valve, which is installed on the primary side connection pipeline between the primary heat exchange module and the intermediate heat exchange module, and is used to control the unidirectional flow of geothermal fluid from the primary heat exchange module to the intermediate heat exchange module and to control its on / off state.

3. The geothermal energy storage and working face cooling system for goaf areas as described in claim 2, characterized in that, It also includes a third control valve, which is installed on the primary side connection pipeline between the intermediate heat exchange module and the final heat exchange module, and is used to control the unidirectional flow of geothermal fluid from the intermediate heat exchange module to the final heat exchange module and to control its on / off state.

4. The geothermal energy storage and working face cooling system for goaf areas as described in claim 3, characterized in that, It also includes a fourth control valve, which is installed on the primary side connection pipeline between the primary heat exchange module and the final heat exchange module, and is used to control the unidirectional flow of geothermal fluid from the primary heat exchange module to the final heat exchange module and to control its on / off state.

5. The geothermal energy storage and working face cooling system for mine goaf as described in claim 4, characterized in that, It also includes a fifth control valve, which is installed on the connecting pipe between the main water inflow pipe of the working face and the evaporator inlet of the high-temperature heat pump unit, and is used to control the unidirectional flow of water from the main water inflow pipe of the working face to the evaporator of the high-temperature heat pump unit and to control the on / off flow of water from the working face to the evaporator of the high-temperature heat pump unit.

6. The geothermal energy storage and working face cooling system for mine goaf as described in claim 5, characterized in that, It also includes a sixth control valve, which is installed on the connecting pipeline between the working face water inflow main and the geothermal reinjection well and is located upstream of the fifth control valve. It is used to control the unidirectional flow of working face water from the working face water inflow main to the geothermal reinjection well and to control its on / off state.

7. A control method for the cooling system of the geothermal energy storage and co-working face in the goaf of a mine as described in claim 6, characterized in that, This includes a winter combined cooling, heating, and cooling (CCHP) system and a summer combined cooling, heating, and cooling (CCHP) system. The winter heating, cooling, and heat supply mode includes: opening the first control valve, the second control valve, the third control valve, the fifth control valve, the sixth control valve, and the seventh control valve, and closing the fourth control valve; The summer combined cooling and heating mode includes: opening the first control valve, the fourth control valve, the fifth control valve, the sixth control valve, and the seventh control valve, and closing the second control valve and the third control valve.

Images