Mine heat recovery system and control method thereof

Abstract

The application discloses a mine heat recovery system and a control method thereof. The heat recovery system comprises a control device, an exhaust heat exchanger for heat exchange with exhaust air in an exhaust shaft, a fresh air heat exchanger for heat exchange with fresh air in a fresh air shaft, and a heat pump mechanism and a heat recovery mechanism electrically connected with the control device respectively. The water supply end and the water return end of the exhaust heat exchanger are connected with 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 with the input end of the heat recovery mechanism. The heat recovery system disclosed by the application can recover the heat of the mine exhaust air to preheat the fresh air of the mine through the heat pump mechanism, thereby improving the energy utilization rate and preventing the occurrence of ground heat pollution. In addition, the heat recovery mechanism can further utilize the heat in the mine exhaust air to meet other heat energy demands of the mine, thereby further improving the energy utilization rate and embodying the efficient and sustainable utilization of energy.

Description

Technical Field

[0001] This invention relates to the field of heat recovery technology, and in particular to a heat recovery system for mines and its control method. Background Technology

[0002] During mine production operations, a large amount of waste heat is inevitably generated. Because the underground space is located in underground rock strata 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 expelling waste gas, carries a large amount of low-grade heat energy. In northern regions, especially in winter, the mine's fresh air needs to be preheated to prevent the intake roadway from freezing due to low temperature. This step is crucial to ensuring the normal operation of the mine. However, currently, mines generally directly discharge mine exhaust air rich in low-grade heat energy into the atmosphere. This practice not only causes a huge waste of energy but also brings thermal pollution problems to the surface environment.

[0003] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a heat recovery system for mines, which can recover the heat of mine exhaust air for preheating of mine fresh air or perform heat recovery to supply heat to the end of the mine, and has the advantage of high energy utilization rate.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A heat recovery system for mines includes 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. The exhaust heat exchanger is used to exchange heat with the exhaust air in the exhaust shaft, and the fresh air heat exchanger is used to exchange heat with the fresh air in the fresh air shaft. The water supply end and return end of the exhaust heat exchanger are connected to the water inlet end and outlet end of the fresh air heat exchanger respectively 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 to supply heat to the heat-using end.

[0007] The aforementioned mine heat recovery system further includes a first temperature detection device and a second temperature detection device, which are electrically connected to the control device respectively; the first temperature detection device is used to acquire the ambient temperature, and the second temperature detection device is used to acquire the fresh air temperature in the fresh air shaft.

[0008] In the aforementioned mine heat recovery system, the heat pump mechanism includes a water supply pipe, a return water 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 water return end of the exhaust heat exchanger through the return water pipe. The water pump is mounted on the water supply pipe and is electrically connected to the control device.

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

[0010] In the aforementioned 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, and the first output end of the water source evaporator is connected to the switching 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-consuming terminals. The compressor is electrically connected to the control device.

[0011] The aforementioned mine heat recovery system further includes a fan, an air source evaporator, a first on / off valve, and a second on / off valve, all electrically connected to the control device. The refrigeration output end of the air source evaporator is connected to the input end of the compressor via 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 via the second on / off valve.

[0012] The present invention also provides a control method for a mine heat recovery system, the control method being used to implement the operation control of the mine heat recovery system as described above, the control method comprising the following steps:

[0013] Obtain the preset fresh air switching temperature and the preset first ambient temperature;

[0014] The system obtains 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 heat to heat the fresh air, and adjust the working state of the heat recovery mechanism according to the comparison results of the real-time ambient temperature, the fresh air switching temperature and the first ambient switching temperature.

[0016] When the real-time fresh air temperature is greater than or equal to the preset fresh air switching temperature, or when the real-time ambient temperature is greater than or equal to 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 aforementioned control method, adjusting the operating state of the heat recovery mechanism based on the comparison results of the real-time ambient temperature, the fresh air switching temperature, and the first ambient temperature switching temperature specifically includes:

[0018] When the real-time ambient temperature is less than or equal to the preset first ambient switching temperature, the heat recovery mechanism is not activated. At this time, the water circulation pump, the switch valve, the first on / off valve, and the second on / off valve are closed, and the compressor is stopped.

[0019] When the preset first ambient switching temperature is less than the real-time ambient temperature and the real-time ambient temperature is less than the preset fresh air switching temperature, the water intake circulation pump, the on / off valve and the first on / off valve are opened, and the compressor and fan are started to work. At this time, a heat recovery cycle is formed between the air source evaporator and the condenser.

[0020] In the aforementioned control method, when the real-time fresh air temperature is greater than or equal to the preset fresh air switching temperature, or when the real-time ambient temperature is greater than or equal to 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, this includes:

[0021] When the real-time fresh air temperature is greater than or equal to the preset fresh air switching temperature, or when the real-time ambient temperature is greater than or equal to the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working, and the water intake circulation pump, the on / off 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] The control method further includes the following steps:

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

[0024] When the real-time ambient temperature is greater than or equal to 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 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] This invention provides a heat recovery system for mines, which connects a fresh air preheater and an exhaust air preheater via a heat pump mechanism. This system recovers heat from mine exhaust air to preheat fresh air, thereby improving energy utilization and preventing surface heat pollution. Furthermore, the heat recovery mechanism can further utilize the heat in the mine exhaust air to supply heat to other heat-consuming terminals in the mine, meeting other thermal energy needs and further improving energy efficiency, demonstrating efficient and sustainable energy use. Attached Figure Description

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

[0028] Figure 2 This is a schematic diagram of the heat recovery mechanism provided by the present invention;

[0029] Figure 3 A logic flowchart 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 water pipe, 43-Water pump, 5-Heat recovery mechanism, 501-Water intake circulation pump, 502-Switch valve, 503-Water source evaporator, 504-Compressor, 505-Condenser, 506-Expansion valve, 507-Fan, 508-Air source evaporator, 509-First on / off valve, 510-Second on / off valve. Detailed Implementation

[0031] This invention provides a heat recovery system for mines and its control method. To make the objectives, technical solutions and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] In the description of this invention, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Please see Figure 1 and Figure 2This invention provides a heat recovery system for mines, including 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. The exhaust heat exchanger 11 is used to exchange heat with the exhaust air in the exhaust shaft 1, and the fresh air heat exchanger 21 is used to exchange heat with the fresh air in the fresh air shaft 2. The water supply end and the water return end of the exhaust heat exchanger 11 are connected to the water inlet end and the water outlet end of the fresh air heat exchanger 21 respectively 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] This application discloses a heat recovery system for mines, which connects a fresh air preheater and an exhaust air preheater via a heat pump mechanism. This system can recover the heat from the mine exhaust air to preheat the mine fresh air, thereby improving energy utilization and preventing ground heat pollution. In addition, the heat recovery mechanism 5 can further utilize the heat in the mine exhaust air to supply heat to other heat-consuming terminals in the mine, meeting other heat energy needs of the mine and further improving energy utilization, demonstrating efficient and sustainable energy use.

[0035] In this embodiment, the control device may be an MCU microcontroller, and the heating terminal may be a heating device or a domestic hot water device in a mine building.

[0036] Further, please refer to Figure 1 The mine heat recovery system further includes a first temperature detection device and a second temperature detection device, which are 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 a first temperature sensor 3, and the second temperature detection device is a second temperature sensor 22. The control device adjusts the working state 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. 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 the efficient operation of the system.

[0038] Further, please refer to Figure 1The heat pump mechanism includes a water supply pipe 41, a return water 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 water return end of the exhaust heat exchanger 11 through the return water pipe 42. The water pump 43 is mounted on the water supply pipe 41 and is electrically connected to the control device.

[0039] In this embodiment, when the heat pump mechanism starts working, the working mode is defined as the 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 has absorbed heat and risen in temperature is transported to the fresh air heat exchanger 21 through the water supply pipe 41 under the power of the water pump 43, and exchanges heat with the fresh air. Then, the refrigerant that has cooled down after heat exchange returns to the exhaust air heat exchanger 11 through the return water pipe 42 to be heated again, realizing the heat recovery cycle of fresh air preheating.

[0040] Further, please refer to 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, and the output end of the water intake circulation pump 501 is connected to the first input end of the water source heat pump unit. The first output end of the water source heat pump unit is connected to the return water 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 terminal.

[0041] Further, please refer to 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, and the first output end of the water source evaporator 503 is connected to the switching 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 to connect to the heat-consuming terminals. The compressor 504 is electrically connected to the control device.

[0042] Further, please refer to Figure 2The mine heat recovery system further includes a fan 507, an air source evaporator 508, a first on / off valve 509, and a second on / off valve 510, all electrically connected to the control device. 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 switching 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. The heat source mode includes water source heat pump mode and air source heat pump mode.

[0045] When the heat source mode is 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 closed. The water intake circulation pump 501 delivers the high-temperature refrigerant preheated by the mine exhaust air to the water source evaporator 503 for cooling. After absorbing heat in the water source evaporator 503, the refrigerant returns to the water supply pipe 41 through the switch valve 502. After absorbing heat, the refrigerant in the water source evaporator 503 is converted into a high-temperature gaseous state and sent to the compressor 504 for compression. The compressed refrigerant enters the condenser 505 to exchange heat with the cooling water. After absorbing heat, the cooling water is delivered to the heat-using terminal through the second output end of the condenser 505. Subsequently, the refrigerant condenses into a liquid state in the condenser 505 and is depressurized through the expansion valve 506. Finally, it returns to the water source evaporator 503 in a low-temperature liquid state, completing the refrigeration cycle.

[0046] When the heat source mode is the air source heat pump mode, the water intake circulation pump 501 is started, the switching valve 502 and the first on / off valve 509 are opened, and the compressor 504 and the fan 507 are started simultaneously. At this time, the second on / off valve 510 will remain closed. The fan 507 introduces ambient air into the air source evaporator 508. The refrigerant in the air source evaporator 508 exchanges heat with the ambient air and absorbs heat to become a high-temperature gaseous state. Subsequently, the high-temperature gaseous refrigerant is sent to the compressor 504 for compression and then enters the condenser 505 to exchange heat with the cooling water. After absorbing heat, the cooling water is delivered to the heat-using terminal through the second output end of the condenser 505. The refrigerant condenses into a liquid state in the condenser 505 and is depressurized through the expansion valve 506. Finally, it returns to the air source evaporator 508 in a low-temperature liquid state, completing the refrigeration cycle.

[0047] Please see Figure 3 The present invention also provides a control method for a mine heat recovery system, the control method being used to implement the operation control of the mine heat recovery system as described above, the control method comprising the following steps:

[0048] 100. Obtain the preset fresh air switching temperature and the preset first ambient temperature;

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

[0050] 200. Obtain 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 heat to heat the fresh air, and adjust the working state of the heat recovery mechanism 5 according to the comparison results of 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 greater than or equal to the preset fresh air switching temperature, or when the real-time ambient temperature is greater than or equal to 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] This application discloses a control method for a heat recovery system in a mine. By setting a fresh air switching temperature and a first ambient switching temperature, the heat recovery system can automatically adjust its working mode according to environmental changes, ensuring sufficient heat recovery from mine exhaust while also preheating the mine's fresh air. Specifically, when the real-time fresh air temperature is lower than the preset fresh air switching temperature, the heat pump mechanism starts working to ensure that the mine's fresh air is fully preheated before entering the mine, avoiding the problem of icing in the intake airway. At this time, the control device will also flexibly adjust the working state of the heat recovery mechanism 5 based on the comparison results of the real-time ambient temperature with the fresh air switching temperature and the first ambient 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 to further optimize energy utilization and recovery. The entire control method fully considers energy saving and the preheating effect of mine fresh air. Through intelligent temperature control and heat recovery mechanisms, it not only avoids the problem of icing in the intake airway but also significantly improves the energy recovery utilization rate and recovery efficiency.

[0054] Furthermore, step 300, which involves adjusting the operating state of the heat recovery mechanism 5 based on the comparison between the real-time ambient temperature, the fresh air switching temperature, and the first ambient temperature, specifically includes:

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

[0056] In this embodiment, when the real-time ambient temperature is ≤-20℃, the outdoor ambient temperature is low, which means that the fresh air temperature in the fresh air shaft 2 is reduced. At this time, the waste heat recovered by the heat recovery system through the exhaust 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 ambient switching temperature is less than the real-time ambient temperature and the real-time ambient 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 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 air 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 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 generated by the heat recovery mechanism 5 is used for heating of the mine heating equipment or for preparing domestic hot water.

[0059] Furthermore, 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 greater than or equal to the preset fresh air switching temperature or when the real-time ambient temperature is greater than or equal to the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working, and the water intake circulation pump 501, the switching 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℃ or the real-time ambient temperature is ≥2℃, the fresh air temperature in the fresh air shaft 2 is high or the outdoor ambient temperature is high, so the fresh air will not cause icing in the intake airway when it is directly input into the fresh air shaft 2. Therefore, there is no need to preheat the fresh air, i.e., the heat pump mechanism stops working. Furthermore, since the efficiency of the water source heat pump is higher than that of the air source heat pump under the same heating capacity, the waste heat of the mine exhaust is recovered by the water source heat pump, i.e., the heat source mode adopted by the heat recovery mechanism 5 is the water source heat pump mode.

[0062] Furthermore, the control method further includes the step of:

[0063] 501. Obtain the 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 environmental switching temperature is 30°C, which can be preset by staff according to environmental parameters.

[0065] 502. 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 501, the switching 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 air source evaporator 508 and the condenser 505.

[0066] In this embodiment, when the real-time ambient temperature is ≥30℃, which is usually summer, 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 air source heat pump mode to ensure that the heat recovery system can still efficiently recover and utilize heat energy under low demand conditions, thereby achieving the purpose of energy saving and emission reduction.

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

Claims

1. A control method for a heat recovery system in a mine, characterized in that, The system includes 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. The exhaust heat exchanger exchanges heat with the exhaust air in the exhaust shaft, and the fresh air heat exchanger exchanges heat with the fresh air in the fresh air shaft. The water supply and return ends of the exhaust heat exchanger are connected to the water inlet and outlet ends of the fresh air heat exchanger via 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 supplies heat to the heat-using terminals. The mine heat recovery system can recover heat from the mine exhaust air for preheating the mine fresh air or perform heat recovery to supply heat to the heat-using terminals in the mine, which are heating equipment or domestic hot water equipment in mine buildings. The system also includes a first temperature detection device and a second temperature detection device electrically connected to the control device. The first temperature detection device is used to acquire the ambient temperature, and the second temperature detection device is used to acquire the fresh air temperature inside the fresh air shaft; the control method includes: Obtain the preset fresh air switching temperature and the preset first ambient temperature; The system obtains 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 heat to heat the fresh air, and adjust the working state of the heat recovery mechanism according to the comparison results of the real-time ambient temperature, the fresh air switching temperature and the first ambient switching temperature. When the real-time fresh air temperature is greater than or equal to the preset fresh air switching temperature, or when the real-time ambient temperature is greater than or equal to 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.

2. The control method according to claim 1, characterized in that, The heat pump mechanism includes a water supply pipe, a water 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 water return end of the exhaust heat exchanger through the water return pipe. The water pump is mounted on the water supply pipe and is electrically connected to the control device.

3. The control method according to claim 2, 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, and the output end of the water intake circulation pump is connected to the first input end of the water source heat pump unit. The first output end of the water source heat pump unit is connected to the return water pipe through the switch valve. The second output end of the water source heat pump unit is used to supply heat to the heat-consuming terminal.

4. The control method according to claim 3, 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 terminal of the water source evaporator is connected to the output terminal of the water intake circulation pump, and the first output terminal of the water source evaporator is connected to the switching valve. The second output terminal of the water source evaporator is connected to the first input terminal of the condenser through the compressor, and the first output terminal of the condenser is connected to the second input terminal of the water source evaporator through the expansion valve. The second output terminal and the second input terminal of the condenser are respectively used to connect to the heat-consuming terminals. The compressor is electrically connected to the control device.

5. The control method according to claim 4, characterized in that, It also includes a fan, an air source evaporator, a first on / off valve, and a second on / off valve, all electrically connected to the control device; 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.

6. The control method according to claim 5, characterized in that, The adjustment of the working state of the heat recovery mechanism based on the comparison results of the real-time ambient temperature, the fresh air switching temperature, and the first ambient temperature specifically includes: When the real-time ambient temperature is less than or equal to the preset first ambient switching temperature, the heat recovery mechanism is not activated. At this time, the water circulation pump, the switch valve, the first on / off valve, and the second on / off valve are closed, and the compressor is stopped. When the preset first ambient switching temperature is less than the real-time ambient temperature and the real-time ambient temperature is less than the preset fresh air switching temperature, the water intake circulation pump, the on / off valve and the first on / off valve are opened, and the compressor and fan are started to work. At this time, a heat recovery cycle is formed between the air source evaporator and the condenser.

7. The control method according to claim 6, characterized in that, When the real-time fresh air temperature is greater than or equal to the preset fresh air switching temperature, or when the real-time ambient temperature is greater than or equal to 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 greater than or equal to the preset fresh air switching temperature, or when the real-time ambient temperature is greater than or equal to the preset fresh air switching temperature, the heat pump mechanism is controlled to stop working, and the water intake circulation pump, the on / off 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.

8. The control method according to claim 6, characterized in that, The control method further includes the following steps: Obtain a preset second environment switching temperature, where the second environment switching temperature is greater than the first environment switching temperature; When the real-time ambient temperature is greater than or equal to 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 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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