Mine heat recovery system and control method thereof

Abstract

The invention discloses a heat recovery system for a mine and a control method of the heat recovery system. The heat recovery system comprises a control device, an exhaust air heat exchanger used for conducting heat exchange with exhaust air in an exhaust shaft, a fresh air heat exchanger used for conducting heat exchange with fresh air in a fresh air shaft, a heat pump mechanism and a heat recovery mechanism, wherein the heat pump mechanism and the heat recovery mechanism are electrically connected with the control device. The water supply end and the water return end of the exhaust air heat exchanger are correspondingly connected with the water inlet end and the water outlet end of the fresh air heat exchanger through a heat pump mechanism. The water supply end of the air exhaust heat exchanger is further connected with the input end of the heat recovery mechanism. According to the heat recovery system, through the heat pump mechanism, heat of mine exhaust air can be recovered to preheat mine fresh air, so that the energy utilization rate is increased, and the ground heat pollution problem is prevented; in addition, by means of the heat recovery mechanism, heat in mine exhaust air can be further utilized to meet other heat energy requirements of the mine, the utilization rate of energy is further increased, and efficient and sustainable utilization of the energy is embodied.

Description

Technical Field

[0001] The present invention relates to the technical field of heat recovery, and in particular to a heat recovery system for a mine and a control method thereof. Background Art

[0002] In the production process of the mine, a large amount of waste heat is inevitably generated. Since the underground space is located in the underground rock layer and is affected by the heat dissipation of various electromechanical equipment, the underground space is actually equivalent to a huge heat storage body. Mine exhaust, as the part of the mine ventilation system responsible for exhausting exhaust gas, carries a large amount of low-grade thermal energy. In the northern region, especially in winter, the fresh air in the mine needs to be preheated to prevent the air intake tunnel from freezing due to low temperature. This step is crucial to ensure the normal operation of the mine. However, current mines generally directly discharge mine exhaust rich in low-grade thermal energy into the atmosphere. This practice not only causes a huge waste of energy, but also brings thermal pollution problems to the ground environment.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a heat recovery system for mines, which can recover the heat of mine exhaust air to preheat the mine fresh air or perform heat recovery to provide heat for the heat-consuming end of the mine, and has the advantage of high energy utilization rate.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A heat recovery system for mines, comprising a control device, an exhaust heat exchanger, a fresh air heat exchanger, and a heat pump mechanism and a heat recovery mechanism electrically connected to the control device respectively, the exhaust heat exchanger being used for exchanging heat with exhaust air in an exhaust shaft, and the fresh air heat exchanger being used for exchanging heat with fresh air in the fresh air shaft; the water supply end and the return water end of the exhaust heat exchanger are correspondingly connected to the water inlet end and the water outlet end of the fresh air heat exchanger through the heat pump mechanism; the water supply end of the exhaust heat exchanger is also connected to the input end of the heat recovery mechanism, and the output end of the heat recovery mechanism is used for supplying heat to a heat-using end.

[0007] The heat recovery system for mines also includes a first temperature detection device and a second temperature detection device electrically connected to the control device respectively; the first temperature detection device is used to obtain the ambient temperature, and the second temperature detection device is used to obtain the fresh air temperature in the fresh air shaft.

[0008] In the heat recovery system for mines, the heat pump mechanism includes a water supply pipe, a return pipe and a water pump; the water supply end of the exhaust heat exchanger is connected to the water inlet end of the fresh air heat exchanger through the water supply pipe, and the water outlet end of the fresh air heat exchanger is connected to the return water end of the exhaust heat exchanger through the return pipe; the water pump is arranged on the water supply pipe, and the water pump is electrically connected to the control device.

[0009] In the mine heat recovery system, the heat recovery mechanism includes a water intake circulation pump, a switch valve and a water source heat pump unit. The input end of the water intake circulation pump is connected to the water supply pipe, the output end of the water intake circulation pump is connected to the first input end of the water source heat pump unit, and the first output end of the water source heat pump unit is connected to the return pipe through the switch valve; the second output end of the water source heat pump unit is used to supply heat to the heat-using end.

[0010] In the mine heat recovery system, the water source heat pump unit includes a water source evaporator, a compressor, a condenser and an expansion valve. The first input end of the water source evaporator is connected to the output end of the water intake circulation pump, the first output end of the water source evaporator is connected to the switch valve, the second output end of the water source evaporator is connected to the first input end of the condenser through the compressor, and the first output end of the condenser is connected to the second input end of the water source evaporator through the expansion valve; the second output end and the second input end of the condenser are respectively used to connect to the heat end; the compressor is electrically connected to the control device.

[0011] The heat recovery system for mines also includes a fan, an air source evaporator, a first on-off valve and a second on-off valve, which are electrically connected to the control device respectively; the refrigeration output end of the air source evaporator is connected to the input end of the compressor through the first on-off valve, and the refrigeration input end of the air source evaporator is connected to the output end of the expansion valve; the second output end of the water source evaporator is connected to the input end of the compressor through the second on-off valve.

[0012] The present invention also provides a control method for a mine heat recovery system accordingly, the control method is used to realize the operation control of the mine heat recovery system as described above, the control method comprises the steps of:

[0013] Obtaining a preset fresh air switching temperature and a preset first environment switching temperature;

[0014] Acquire the real-time fresh air temperature fed back by the second temperature detection device and the real-time ambient temperature fed back by the first temperature detection device;

[0015] When the real-time fresh air temperature is less than the preset fresh air switching temperature, the heat pump mechanism is controlled to start working, recover the exhaust air heat to heat the fresh air, and adjust the working state of the heat recovery mechanism according to the comparison result of the real-time ambient temperature with the fresh air switching temperature and the first ambient switching temperature;

[0016] When the real-time fresh air temperature is ≥ the preset fresh air switching temperature or when the real-time ambient temperature is ≥ the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working, and the heat recovery mechanism is controlled to start working.

[0017] In the control method, adjusting the working state of the heat recovery mechanism according to the comparison result of the real-time ambient temperature with the fresh air switching temperature and the first ambient switching temperature specifically includes:

[0018] When the real-time ambient temperature is ≤ the preset first ambient switching temperature, the heat recovery mechanism is controlled not to work. At this time, the water intake circulation pump, the switch valve, the first on-off valve, and the second on-off valve are in a closed state, and the compressor is in a stopped state;

[0019] When the preset first environment switching temperature is less than the real-time environment temperature and the real-time environment temperature is less than the preset fresh air switching temperature, the water intake circulation pump, the switch valve and the first on-off valve are controlled to open, and the compressor and the fan are controlled to start working. At this time, a heat recovery cycle is formed between the air source evaporator and the condenser.

[0020] In the control method, when the real-time fresh air temperature is ≥ the preset fresh air switching temperature or when the real-time ambient temperature is ≥ the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working and the heat recovery mechanism is controlled to start working, which specifically includes:

[0021] When the real-time fresh air temperature is ≥ the preset fresh air switching temperature or when the real-time ambient temperature is ≥ the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working, and the water intake circulation pump, the switch valve and the second on-off valve are controlled to open, and the compressor is controlled to start working. At this time, a heat recovery cycle is formed between the water source evaporator and the condenser.

[0022] In the control method, the control method further comprises the steps of:

[0023] Obtaining a preset second environment switching temperature, wherein the second environment switching temperature is greater than the first environment switching temperature;

[0024] When the real-time ambient temperature is ≥ the preset second ambient switching temperature, the heat pump mechanism is controlled to stop working, and the water intake circulation pump, the switch valve and the first on-off valve are controlled to open, and the compressor and the fan are controlled to start working. At this time, a heat recovery cycle is formed between the air source evaporator and the condenser.

[0025] Beneficial effects:

[0026] The present invention provides a heat recovery system for mines. By connecting a fresh air preheater and an exhaust air preheater respectively through a heat pump mechanism, the heat of the mine exhaust air can be recovered to preheat the mine fresh air, thereby improving the energy utilization rate and preventing the occurrence of ground heat pollution problems. In addition, by utilizing the heat recovery mechanism, the heat in the mine exhaust air can be further utilized to supply heat to other heat-consuming terminals in the mine, which can meet other thermal energy needs of the mine, further improve the energy utilization rate, and reflect the efficient and sustainable use of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of the heat recovery system provided by the present invention;

[0028] Figure 2 A schematic diagram of the structure of the heat recovery mechanism provided by the present invention;

[0029] Figure 3 A logic flow chart of the control method provided by the present invention;

[0030] Explanation of main component symbols: 1-exhaust shaft, 11-exhaust heat exchanger, 2-fresh air shaft, 21-fresh air heat exchanger, 22-second temperature sensor, 3-first temperature sensor, 41-water supply pipe, 42-return pipe, 43-water pump, 5-heat recovery mechanism, 501-water intake circulation pump, 502-on-off valve, 503-water source evaporator, 504-compressor, 505-condenser, 506-expansion valve, 507-fan, 508-wind source evaporator, 509-first on-off valve, 510-second on-off valve. DETAILED DESCRIPTION

[0031] The present invention provides a heat recovery system for a mine and a control method thereof. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0032] In the description of the present invention, it should be understood that the terms "installation", "connection" and the like should be understood in a broad sense, and a person skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0033] See also Figure 1 and Figure 2The present invention provides a heat recovery system for a mine, comprising a control device, an exhaust heat exchanger 11, a fresh air heat exchanger 21, and a heat pump mechanism and a heat recovery mechanism 5 electrically connected to the control device respectively, wherein the exhaust heat exchanger 11 is used for heat exchange with exhaust air in an exhaust shaft 1, and the fresh air heat exchanger 21 is used for heat exchange with fresh air in a fresh air shaft 2; the water supply end and the return water end of the exhaust heat exchanger 11 are correspondingly connected to the water inlet end and the water outlet end of the fresh air heat exchanger 21 through the heat pump mechanism; the water supply end of the exhaust heat exchanger 11 is also connected to the input end of the heat recovery mechanism 5, and the output end of the heat recovery mechanism 5 is used to supply heat to the heat-using end.

[0034] The present application discloses a heat recovery system for mines. By connecting a fresh air preheater and an exhaust air preheater respectively through a heat pump mechanism, the heat of the mine exhaust air can be recovered to preheat the mine fresh air, thereby improving the energy utilization rate and preventing the occurrence of ground heat pollution problems; in addition, by utilizing the heat recovery mechanism 5, the heat in the mine exhaust air can be further utilized to supply heat to other heat-consuming terminals of the mine, which can meet other thermal energy needs of the mine, further improve energy utilization, and reflect the efficient and sustainable use of energy.

[0035] In this embodiment, the control device may be an MCU single-chip computer, and the heat-using terminal may be a heating device or a domestic hot water device in a mine building.

[0036] For further information, see Figure 1 The mine heat recovery system also includes a first temperature detection device and a second temperature detection device electrically connected to the control device respectively; the first temperature detection device is used to obtain the ambient temperature, and the second temperature detection device is used to obtain the fresh air temperature in the fresh air shaft 2.

[0037] In this embodiment, the first temperature detection device is the first temperature sensor 3, and the second temperature detection device is the second temperature sensor 22; the control device adjusts the working states of the heat pump mechanism and the heat recovery mechanism 5 according to the real-time ambient temperature fed back by the first temperature detection device and the real-time fresh air temperature fed back by the second temperature detection device, so as to fully recover the heat of the mine exhaust air. It has the advantage of high working flexibility, so that the heat source recovery system always maintains a high heat recovery efficiency level, ensuring the effective use of energy and efficient operation of the system.

[0038] For further information, see Figure 1The heat pump mechanism includes a water supply pipe 41, a return pipe 42 and a water pump 43. The water supply end of the exhaust heat exchanger 11 is connected to the water inlet end of the fresh air heat exchanger 21 through the water supply pipe 41, and the water outlet end of the fresh air heat exchanger 21 is connected to the return water end of the exhaust heat exchanger 11 through the return pipe 42; the water pump 43 is arranged on the water supply pipe 41, and the water pump 43 is electrically connected to the control device.

[0039] In this embodiment, when the heat pump mechanism starts working, the working mode is defined as a heat recovery loop circulation mode. At this time, the water pump 43 starts working. After the mine exhaust air exchanges heat with the exhaust air heat exchanger 11, the refrigerant that absorbs heat and heats up is transported to the fresh air heat exchanger 21 through the water supply pipe 41 under the power of the water pump 43 to exchange heat with the fresh air; then, the refrigerant that has been cooled down by heat exchange returns to the exhaust air heat exchanger 11 through the return pipe 42 to be heated again, thereby realizing a heat recovery cycle for preheating the fresh air.

[0040] For further information, see Figure 2 The heat recovery mechanism 5 includes a water intake circulation pump 501, a switch valve 502 and a water source heat pump unit. The input end of the water intake circulation pump 501 is connected to the water supply pipe 41, the output end of the water intake circulation pump 501 is connected to the first input end of the water source heat pump unit, and the first output end of the water source heat pump unit is connected to the return pipe 42 through the switch valve 502; the second output end of the water source heat pump unit is used to supply heat to the heat-using end.

[0041] For further information, see Figure 2 The water source heat pump unit includes a water source evaporator 503, a compressor 504, a condenser 505 and an expansion valve 506. The first input end of the water source evaporator 503 is connected to the output end of the water intake circulation pump 501, the first output end of the water source evaporator 503 is connected to the switch valve 502, the second output end of the water source evaporator 503 is connected to the first input end of the condenser 505 through the compressor 504, and the first output end of the condenser 505 is connected to the second input end of the water source evaporator 503 through the expansion valve 506; the second output end and the second input end of the condenser 505 are respectively used for connecting hot ends; the compressor 504 is electrically connected to the control device.

[0042] For further information, see Figure 2The mine heat recovery system also includes a fan 507, an air source evaporator 508, a first on-off valve 509 and a second on-off valve 510 which are electrically connected to the control device respectively; the refrigeration output end of the air source evaporator 508 is connected to the input end of the compressor 504 through the first on-off valve 509, and the refrigeration input end of the air source evaporator 508 is connected to the output end of the expansion valve 506; the second output end of the water source evaporator 503 is connected to the input end of the compressor 504 through the second on-off valve 510.

[0043] In this embodiment, the switch valve 502 is an electric valve, and the first on-off valve 509 and the second on-off valve 510 are solenoid valves.

[0044] In this embodiment, the heat source mode of the heat recovery mechanism 5 can be adjusted according to the real-time ambient temperature fed back by the first temperature detection device and the real-time fresh air temperature fed back by the second temperature detection device, and the heat source mode includes a water source heat pump mode and an air source heat pump mode;

[0045] When the heat source mode is the water source heat pump mode, the water intake circulation pump 501 is started, the switch valve 502 and the second on-off valve 510 are opened, and the compressor 504 starts working at the same time. At this time, the first on-off valve 509 remains in a closed state; the water intake circulation pump 501 transports the high-temperature refrigerant preheated by the mine exhaust air to the water source evaporator 503 for cooling. After the refrigerant absorbs heat in the water source evaporator 503, it returns to the water supply pipe 41 through the switch valve 502; the refrigerant in the water source evaporator 503 absorbs heat and is converted into a high-temperature gas state, and is sent to the compressor 504 for compression. The compressed refrigerant enters the condenser 505 for heat exchange with the cooling water. After the cooling water absorbs heat, it is transported to the heat-using end through the second output end of the condenser 505. Subsequently, the refrigerant is condensed into a liquid state in the condenser 505, and the pressure is reduced through the expansion valve 506, and finally returns to the water source evaporator 503 as a low-temperature liquid, completing the refrigeration cycle;

[0046] When the heat source mode is the wind source heat pump mode, start the water intake circulation pump 501, open the switch valve 502 and the first on-off valve 509, and start the compressor 504 and the fan 507 at the same time. At this time, the second on-off valve 510 will remain closed; the fan 507 introduces ambient air into the wind source evaporator 508, and the refrigerant in the wind source evaporator 508 exchanges heat with the ambient air, and is converted into a high-temperature gas after absorbing heat. Subsequently, the high-temperature gaseous refrigerant is sent to the compressor 504 for compression, and then enters the condenser 505 for heat exchange with the cooling water. After the cooling water absorbs the heat, it is transported to the heat-using end through the second output end of the condenser 505. The refrigerant is condensed into a liquid in the condenser 505, and the pressure is reduced through the expansion valve 506, and finally returns to the wind source evaporator 508 as a low-temperature liquid, completing the refrigeration cycle.

[0047] See also Figure 3 The present invention also provides a control method for a mine heat recovery system accordingly, the control method is used to realize the operation control of the mine heat recovery system as described above, the control method comprises the steps of:

[0048] 100. Obtain a preset fresh air switching temperature and a preset first environment switching temperature;

[0049] In this embodiment, the preset fresh air switching temperature is 2° C., and the preset first environment switching temperature is −20° C., which can be preset by the staff based on experience.

[0050] 200. Obtaining the real-time fresh air temperature fed back by the second temperature detection device and the real-time ambient temperature fed back by the first temperature detection device;

[0051] 300. When the real-time fresh air temperature is less than the preset fresh air switching temperature, the heat pump mechanism is controlled to start working, recover the exhaust air heat to heat the fresh air, and adjust the working state of the heat recovery mechanism 5 according to the comparison result between the real-time ambient temperature, the fresh air switching temperature and the first ambient switching temperature;

[0052] 400. When the real-time fresh air temperature is ≥ the preset fresh air switching temperature or when the real-time ambient temperature is ≥ the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working, and the heat recovery mechanism 5 is controlled to start working.

[0053] The present application discloses a control method for a heat recovery system for a mine. By setting a fresh air switching temperature and a first environment switching temperature, the heat recovery system can automatically adjust its working mode according to environmental changes, ensuring that the heat of the mine exhaust is fully recovered while taking into account the preheating of the mine fresh air; specifically, when the real-time fresh air temperature is lower than the preset fresh air switching temperature, the heat pump mechanism is controlled to start working to ensure that the mine fresh air is fully preheated before entering the mine, thereby avoiding the problem of icing in the air inlet tunnel. At this time, the control device will also flexibly adjust the working state of the heat recovery mechanism 5 according to the comparison result of the real-time ambient temperature with the fresh air switching temperature and the first environment switching temperature to achieve the best heat recovery effect; when the real-time fresh air temperature reaches or exceeds the preset fresh air switching temperature, the control device automatically stops the operation of the heat pump mechanism and starts the heat recovery mechanism 5 instead, thereby further optimizing energy utilization and recovery; the entire control method fully considers energy saving and the preheating effect of the mine fresh air, and through intelligent temperature control and heat energy recovery mechanism, not only the occurrence of icing in the air inlet tunnel is avoided, but also the energy recovery rate and recovery efficiency are significantly improved.

[0054] Furthermore, the step 300 of adjusting the working state of the heat recovery mechanism 5 according to the comparison result between the real-time ambient temperature and the fresh air switching temperature and the first ambient switching temperature specifically includes:

[0055] 301. When the real-time environment temperature is less than or equal to the preset first environment switching temperature, the heat recovery mechanism 5 is controlled not to work. At this time, the water intake circulation pump 501, the switch valve 502, the first on-off valve 509, and the second on-off valve 510 are in a closed state, and the compressor 504 is in a stopped state;

[0056] In this embodiment, when the real-time ambient temperature is ≤-20°C, the outdoor ambient temperature is low, which means that the fresh air temperature in the fresh air shaft 2 is reduced. At this time, all the waste heat recovered by the heat recovery system through the exhaust air heat exchanger 11 is used for fresh air preheating to ensure that the fresh air temperature is effectively increased.

[0057] 302. When the preset first environment switching temperature is less than the real-time environment temperature and the real-time environment temperature is less than the preset fresh air switching temperature, the water intake circulation pump 501, the switch valve 502 and the first on-off valve 509 are controlled to be turned on, and the compressor 504 and the fan 507 are controlled to start working. At this time, a heat recovery cycle is formed between the wind source evaporator 508 and the condenser 505;

[0058] In this embodiment, when -20℃<real-time ambient temperature<2℃, the heat pump mechanism and the heat recovery mechanism 5 are turned on at the same time. At this time, the heat source mode of the heat recovery mechanism 5 is the water source mode. Part of the exhaust waste heat recovered by the exhaust heat exchanger 11 is used for fresh air heat exchange, and the other part is recovered by the heat recovery mechanism 5. The heat produced by the heat recovery mechanism 5 is used for heating the mine heating equipment or for preparing domestic hot water.

[0059] Further, in step 400, when the real-time fresh air temperature is ≥ the preset fresh air switching temperature or when the real-time ambient temperature is ≥ the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working, and the heat recovery mechanism 5 is controlled to start working, specifically including:

[0060] 401. When the real-time fresh air temperature is ≥ the preset fresh air switching temperature or when the real-time ambient temperature is ≥ the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working, and the water intake circulation pump 501, the switch valve 502 and the second on-off valve 510 are controlled to open, and the compressor 504 is controlled to start working. At this time, a heat recovery cycle is formed between the water source evaporator 503 and the condenser 505;

[0061] In this embodiment, when the real-time fresh air temperature is ≥2°C or when the real-time ambient temperature is ≥2°C, since the fresh air temperature in the fresh air shaft 2 is relatively high or the temperature of the outdoor environment is relatively high, the fresh air is directly input into the fresh air shaft 2 without causing the problem of icing in the air inlet channel. Therefore, there is no need to preheat the fresh air, that is, the heat pump mechanism stops working; further, since the efficiency of the water source heat pump is higher than that of the wind source heat pump under the same heating capacity, the water source heat pump is used to recover the waste heat of the mine exhaust, that is, the heat source mode adopted by the heat recovery mechanism 5 is the water source heat pump mode.

[0062] Furthermore, the control method further comprises the steps of:

[0063] 501. Obtain a preset second environment switching temperature, where the second environment switching temperature is greater than the first environment switching temperature;

[0064] In this embodiment, the second environment switching temperature is 30° C., which can be pre-set by the staff according to environmental parameters.

[0065] 502. When the real-time environment temperature is ≥ the preset second environment switching temperature, the heat pump mechanism is controlled to stop working, and the water intake circulation pump 501, the switch valve 502 and the first on-off valve 509 are controlled to open, and the compressor 504 and the fan 507 are controlled to start working. At this time, a heat recovery cycle is formed between the wind source evaporator 508 and the condenser 505;

[0066] In this embodiment, when the real-time ambient temperature is ≥30°C, it is usually summer, and there is no need to preheat the fresh air in the fresh air duct, and the heat demand is low, that is, only a small amount of hot water needs to be prepared. Therefore, the heat pump mechanism is controlled to stop working, and the heat source mode of the heat recovery mechanism 5 is adjusted to the wind source heat pump mode to ensure that under low demand conditions, the heat recovery system can still efficiently recover and utilize heat energy, thereby achieving the purpose of energy saving and emission reduction.

[0067] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A heat recovery system for a mine, characterized in that: It includes a control device, an exhaust air heat exchanger, a fresh air heat exchanger, and a heat pump mechanism and a heat recovery mechanism electrically connected to the control device respectively. The exhaust air heat exchanger is used for exchanging heat with exhaust air in the exhaust shaft, and the fresh air heat exchanger is used for exchanging heat with fresh air in the fresh air shaft; the water supply end and the return water end of the exhaust air heat exchanger are correspondingly connected to the water inlet end and the water outlet end of the fresh air heat exchanger through the heat pump mechanism; the water supply end of the exhaust air heat exchanger is also connected to the input end of the heat recovery mechanism, and the output end of the heat recovery mechanism is used to supply heat to the heat-using end.

2. A heat recovery system for mines according to claim 1, characterized in that: It also includes a first temperature detection device and a second temperature detection device electrically connected to the control device respectively; the first temperature detection device is used to obtain the ambient temperature, and the second temperature detection device is used to obtain the fresh air temperature in the fresh air shaft.

3. A heat recovery system for mines according to claim 2, characterized in that: The heat pump mechanism includes a water supply pipe, a return pipe and a water pump. The water supply end of the exhaust heat exchanger is connected to the water inlet end of the fresh air heat exchanger through the water supply pipe, and the water outlet end of the fresh air heat exchanger is connected to the return water end of the exhaust heat exchanger through the return pipe; the water pump is arranged on the water supply pipe, and the water pump is electrically connected to the control device.

4. A heat recovery system for mines according to claim 3, characterized in that: The heat recovery mechanism includes a water intake circulation pump, a switch valve and a water source heat pump unit. The input end of the water intake circulation pump is connected to the water supply pipe, the output end of the water intake circulation pump is connected to the first input end of the water source heat pump unit, and the first output end of the water source heat pump unit is connected to the return pipe through the switch valve; the second output end of the water source heat pump unit is used to supply heat to the heat-using end.

5. A heat recovery system for mines according to claim 4, characterized in that: The water source heat pump unit includes a water source evaporator, a compressor, a condenser and an expansion valve. The first input end of the water source evaporator is connected to the output end of the water intake circulation pump, the first output end of the water source evaporator is connected to the switch valve, the second output end of the water source evaporator is connected to the first input end of the condenser through the compressor, and the first output end of the condenser is connected to the second input end of the water source evaporator through the expansion valve; the second output end and the second input end of the condenser are respectively used for connecting hot ends; the compressor is electrically connected to the control device.

6. A heat recovery system for mines according to claim 5, characterized in that: It also includes a fan, an air source evaporator, a first on-off valve and a second on-off valve which are electrically connected to the control device respectively; the refrigeration output end of the air source evaporator is connected to the input end of the compressor through the first on-off valve, and the refrigeration input end of the air source evaporator is connected to the output end of the expansion valve; the second output end of the water source evaporator is connected to the input end of the compressor through the second on-off valve.

7. A control method for a heat recovery system for a mine, characterized in that: The control method is used to implement the operation control of the mine heat recovery system according to claim 6, and the control method comprises the steps of: Obtaining a preset fresh air switching temperature and a preset first environment switching temperature; Acquire the real-time fresh air temperature fed back by the second temperature detection device and the real-time ambient temperature fed back by the first temperature detection device; When the real-time fresh air temperature is less than the preset fresh air switching temperature, the heat pump mechanism is controlled to start working, recover the exhaust air heat to heat the fresh air, and adjust the working state of the heat recovery mechanism according to the comparison result of the real-time ambient temperature with the fresh air switching temperature and the first ambient switching temperature; When the real-time fresh air temperature is ≥ the preset fresh air switching temperature or when the real-time ambient temperature is ≥ the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working, and the heat recovery mechanism is controlled to start working.

8. The control method according to claim 7, characterized in that: The adjusting the working state of the heat recovery mechanism according to the comparison result of the real-time ambient temperature with the fresh air switching temperature and the first ambient switching temperature specifically includes: When the real-time ambient temperature is ≤ the preset first ambient switching temperature, the heat recovery mechanism is controlled not to work. At this time, the water intake circulation pump, the switch valve, the first on-off valve, and the second on-off valve are in a closed state, and the compressor is in a stopped state; When the preset first environment switching temperature is less than the real-time environment temperature and the real-time environment temperature is less than the preset fresh air switching temperature, the water intake circulation pump, the switch valve and the first on-off valve are controlled to open, and the compressor and the fan are controlled to start working. At this time, a heat recovery cycle is formed between the air source evaporator and the condenser.

9. The control method according to claim 7, characterized in that: When the real-time fresh air temperature is ≥ the preset fresh air switching temperature or when the real-time ambient temperature is ≥ the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working and the heat recovery mechanism is controlled to start working, specifically including: When the real-time fresh air temperature is ≥ the preset fresh air switching temperature or when the real-time ambient temperature is ≥ the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working, and the water intake circulation pump, the switch valve and the second on-off valve are controlled to open, and the compressor is controlled to start working. At this time, a heat recovery cycle is formed between the water source evaporator and the condenser.

10. The control method according to claim 7, characterized in that: The control method further comprises the steps of: Obtaining a preset second environment switching temperature, wherein the second environment switching temperature is greater than the first environment switching temperature; When the real-time ambient temperature is ≥ the preset second ambient switching temperature, the heat pump mechanism is controlled to stop working, and the water intake circulation pump, the switch valve and the first on-off valve are controlled to open, and the compressor and the fan are controlled to start working. At this time, a heat recovery cycle is formed between the air source evaporator and the condenser.

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