Direct heating and direct cooling coupled multi-heat source shaft anti-freezing system

Abstract

The utility model relates to direct heating direct cooling formula coupling multiple heat source shaft freezing prevention system for heating the fresh air to enter the mine, its characterized in that, including: first heat source part, it sets up in the return air shaft of mine, and is used for making the return air of return air shaft and heat extraction medium heat exchange, heat pump part is connected in the first heat source part, the heat pump working medium that circulates in the heat pump part can exchange heat with the heat extraction medium, and can exchange heat with the heat supply medium, air inlet heating part sets up in the air inlet of mine, air inlet heating part is connected in the first heat source part with the heat pump part, is used for making the heat extraction medium that has carried out heat exchange in the first heat source part and / or the heat supply medium that has carried out heat exchange in the heat pump part and the fresh air heat exchange, thereby heating the fresh air.

Description

Technical Field

[0001] This utility model relates to the field of mine waste heat utilization, and in particular to a direct heating and cooling coupled multi-heat source wellbore antifreeze system for exchanging heat with mine fresh air. Background Technology

[0002] Mines contain a large amount of waste heat, including waste heat from mine return air, mine water, and domestic sewage. For example, mine return air (exhaust air) is characterized by large volume, stable temperature, high relative humidity, and good continuity, making it an excellent low-temperature waste heat resource. In winter, heat pumps can be used to extract waste heat from the return air to meet the needs of mine building heating, hot water preparation for bathing, and antifreeze heating at the mine entrance. In summer, mine return air can be used for cooling in buildings or for cooling down the mine.

[0003] Generally, a mine exhaust ventilation system, specifically a return air diffuser tower, includes two sets of fans, one for operation and one as a backup, running year-round. The mine return air heat exchange system includes a return air heat exchange platform located above the return air diffuser tower. Mine return air enters the return air heat exchange platform from the diffuser tower via ventilation ducts. The return air heat exchanger on the platform allows for heat exchange between the return air and a heat-extracting medium. This heat-extracting medium is then transported to the intake shaft to exchange heat with fresh air, thus utilizing the waste heat from the mine return air.

[0004] However, when the heating load far exceeds the heating capacity of the mine's waste heat, using waste heat directly as the sole heat source will result in an inability to meet the load demand. Utility Model Content

[0005] Problems to be solved by the utility model

[0006] In existing technologies, the heating capacity of mine waste heat is affected by many factors, resulting in unstable heating. When the mine's fresh air is heated by the shaft antifreeze system, the temperature of the air supplied to the intake shaft may not reach the target temperature. Usually, the temperature of the mixed air supplied to the intake shaft needs to reach 2°C or higher, otherwise it may easily cause safety accidents. When the heating capacity of mine waste heat is insufficient, the mode of directly heating by using waste heat alone cannot meet the load demand.

[0007] Solution for solving the problem

[0008] A direct-heating and direct-cooling coupled multi-heat source shaft antifreeze system is disclosed for heating fresh air entering a mine. The system comprises: a first heat source unit located at the mine's return air shaft, used to exchange heat between the return air discharged from the return air shaft and a heat extraction medium; a heat pump unit connected to the first heat source unit, in which a heat pump working fluid can exchange heat with both the heat extraction medium and a heat supply medium; and an intake air heating unit located at the mine's intake air shaft, connected to both the first heat source unit and the heat pump unit, used to heat the fresh air by exchanging heat with the heat extraction medium (which has undergone heat exchange at the first heat source unit) and / or the heat supply medium (which has undergone heat exchange at the heat pump unit).

[0009] According to the aforementioned direct-heating and direct-cooling coupled multi-heat-source wellbore antifreeze system, the system further comprises: a first circulation pipeline connecting the first heat source section to the air intake heating section and used to supply the heat extraction medium to the air intake heating section; a second circulation pipeline connecting the first heat source section to the heat pump section and used to supply the heat extraction medium to the heat pump section; and a third circulation pipeline connecting the heat pump section to the air intake heating section and used to supply the heating medium to the air intake heating section.

[0010] According to the aforementioned direct heating and cooling coupled multi-heat source wellbore antifreeze system, it is characterized in that it further includes: a first regulating valve, which is installed in the water supply pipeline of the first circulation pipeline; a second regulating valve, which is installed in the water return pipeline of the first circulation pipeline; a third regulating valve, which is installed in the water supply pipeline of the second circulation pipeline; and a fourth regulating valve, which is installed in the water return pipeline of the second circulation pipeline.

[0011] According to the aforementioned direct heating and cooling coupled multi-heat source wellbore antifreeze system, the first heat source section includes a return air heat exchanger, which is installed on the side wall of the return air heat exchange platform connected to the return air well.

[0012] The direct heating and cooling coupled multi-heat source well antifreeze system is characterized in that it further includes a fan unit, which is installed in the ventilation room connected to the return air shaft.

[0013] According to the aforementioned direct heating and cooling coupled multi-heat source shaft antifreeze system, the air intake heating unit includes a mine shaft air heating unit, which is installed in the shaft house connected to the air intake shaft.

[0014] According to the aforementioned direct-heating and direct-cooling coupled multi-heat-source wellbore antifreeze system, the heat pump section comprises an evaporator, a compressor, a condenser, and an expansion valve connected in series by a fourth circulation pipeline; wherein the inlet and outlet of the evaporator on the heat source side are respectively connected to the water supply pipeline and the water return pipeline of the second circulation pipeline, and the outlet and inlet of the evaporator on the heat pump working fluid side are respectively connected to the water supply pipeline and the water return pipeline of the fourth circulation pipeline; wherein the inlet and outlet of the condenser on the heat pump working fluid side are respectively connected to the water supply pipeline and the water return pipeline of the fourth circulation pipeline, and the outlet and inlet of the condenser on the heating medium side are respectively connected to the water supply pipeline and the water return pipeline of the third circulation pipeline.

[0015] According to the aforementioned direct heating and cooling coupled multi-heat source wellbore antifreeze system, the system is characterized in that at least one circulating water pump is provided in the return water pipeline of at least one of the first circulating pipelines to the third circulating pipeline.

[0016] The direct heating and cooling coupled multi-heat source wellbore antifreeze system is characterized by further comprising: a second heat source section, which is connected to the air intake heating section via a fifth circulation pipeline, wherein the heat exchange medium flowing in the second heat source section is transported to the air intake heating section via the fifth circulation pipeline to allow the heat exchange medium to exchange heat with the fresh air.

[0017] The direct heating and cooling coupled multi-heat source wellbore antifreeze system is characterized by further comprising: a fifth regulating valve, which is installed in the water supply pipeline of the fifth circulation pipeline; and a sixth regulating valve, which is installed in the water return pipeline of the fifth circulation pipeline.

[0018] Effects of the utility model

[0019] The shaft antifreeze system of this invention couples multiple heat sources. When the shaft heating load is small, it utilizes only the mine's waste heat for direct heating, resulting in low operating costs. When the shaft heating load increases, it adopts a combined heating mode of direct mine waste heat supply and heat pump units to bear part of the load, or it can rely entirely on heat pump units for heating. This achieves safe, stable, and efficient operation of the shaft antifreeze system under different load demands. It can fully utilize low-cost mine waste heat resources to reduce heating energy consumption and maximize the utilization value of mine waste heat, while ensuring heating demand and ensuring that the fresh air supplied to the intake shaft reaches the target temperature, thus balancing economy and stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the combined operation mode of the direct heating and cooling coupled multi-heat source wellbore antifreeze system involved in this embodiment.

[0021] Figure 2This is a schematic diagram illustrating the direct heating and cooling coupled multi-heat source wellbore antifreeze system according to this embodiment in the waste heat direct heating mode.

[0022] Figure 3 This is a schematic diagram illustrating the direct heating and cooling coupled multi-heat source wellbore antifreeze system according to this embodiment in heat pump heating mode. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] <Example>

[0025] The direct heating and cooling coupled multi-heat source wellbore antifreeze system involved in this embodiment couples multiple different types of heat sources, combining direct heating from mine waste heat and heating from heat pump units, thereby providing multiple different heating modes. The operating mode can be flexibly adjusted according to changes in heating load, thus taking into account economy, stability and safety when heating fresh air in the mine.

[0026] like Figure 1 As shown, the direct heating and cooling coupled multi-heat source shaft antifreeze system includes: a first heat source unit 1, which is located at the return air shaft of the mine and is used to exchange heat between the return air discharged from the return air shaft and the heat extraction medium; a heat pump unit 2, which is connected to the first heat source unit 1, wherein the heat pump working fluid flowing in the heat pump unit 2 can exchange heat with the heat extraction medium and can also exchange heat with the heat supply medium; and an air intake heating unit 3, which is located at the air intake shaft of the mine and is connected to the first heat source unit 1 and the heat pump unit 2, and is used to exchange heat between the heat extraction medium that has undergone heat exchange in the first heat source unit 1 and / or the heat supply medium that has undergone heat exchange in the heat pump unit 2 and the fresh air, thereby heating the fresh air.

[0027] Specifically, in this embodiment, the first heat source unit 1 utilizes waste heat resources from the mine to exchange heat with the heat extraction medium. The heat extraction medium should be selected based on its high specific heat, low density, low viscosity, good thermal conductivity, high safety, and environmental friendliness. In this embodiment, the heat extraction medium can be a fluid such as ethylene glycol solution or water. The heat pump unit 2 consumes a small amount of electrical energy to drive the heat pump working fluid to circulate within the system. The heat pump working fluid further exchanges heat with the heat extraction medium heated by the return air, and after the heat pump unit performs work, the temperature of the heat pump working fluid is further increased before it exchanges heat with the heating medium supplied to the intake air heating unit 3. The heat pump working fluid (also known as refrigerant) is the working medium in the heat pump unit that achieves heat transfer through phase change (evaporation absorbing heat, condensation releasing heat), such as refrigerants like ammonia, water, and carbon dioxide.

[0028] In this embodiment, the air intake heating unit 3 can provide at least three heating modes: direct waste heat heating mode, combined waste heat and heat pump heating mode, and heat pump heating mode. Specific details are as follows.

[0029] Waste heat direct heating mode such as Figure 2 As shown, under low heating load conditions, the heat exchange medium heated by the mine return air is used to heat the fresh air. In this heating mode, the waste heat of the mine return air is mainly used for heating, which reduces intermediate energy conversion links (such as the energy consumption of not needing to operate a heat pump), resulting in lower energy loss. Moreover, the long-term operating cost is much lower than that of coal-fired, gas-fired, or electric heating, and it can reduce the cost of waste heat emission treatment and reduce pollutant emissions.

[0030] Waste heat and heat pump combined heating mode such as Figure 1 As shown, when the heating load increases, not only is the heat extraction medium heated by the mine return air used, but the heat pump working fluid of the heat pump unit is also used to heat the fresh air, thereby enabling the heat pump unit to bear part of the heating load.

[0031] Heat pump heating mode such as Figure 3 As shown, when the heating load increases further, for example when the heating load far exceeds the heating capacity of the mine return air, the heat provided by the heat pump unit can be fully utilized to heat the fresh air.

[0032] This utility model provides a direct heating and cooling coupled multi-heat source shaft antifreeze system that can switch between different heating modes. This allows for real-time and flexible adjustments based on the heat load demand and heat source status within the mine shaft, fully leveraging the advantages of each heat source. It utilizes mine waste heat to reduce operating costs and maximize its utilization value, while also using heat pump units to meet heat load demands under high heating conditions. This ensures that the fresh air supplied to the intake shaft reaches the target temperature, balancing economy and reliability, improving overall energy utilization, adapting to complex operating conditions, and ensuring effective antifreeze protection for the mine shaft.

[0033] like Figure 1 As shown, the direct heating and cooling coupled multi-heat source wellbore antifreeze system in this embodiment further includes: a first circulation pipeline (including 401a and 401b), which connects the first heat source 1 to the air intake heating unit 3 and is used to deliver a heat extraction medium to the air intake heating unit 3; a second circulation pipeline (including 402a and 402b), which connects the first heat source 1 to the heat pump unit 2 and is used to deliver a heat extraction medium to the heat pump unit 2; and a third circulation pipeline (including 403a and 403b), which connects the heat pump unit 2 to the air intake heating unit 3 and is used to deliver a heat supply medium to the air intake heating unit 3.

[0034] Each circulation pipeline also includes supply water pipelines and return water pipelines, for example Figure 1 As shown, the first circulation pipeline includes a water supply pipeline 401a and a return water pipeline 401b, the second circulation pipeline includes a water supply pipeline 402a and a return water pipeline 402b, and the third circulation pipeline includes a water supply pipeline 403a and a return water pipeline 403b.

[0035] Furthermore, such as Figure 1 As shown, the direct heating and cooling coupled multi-heat source wellbore antifreeze system in this embodiment further includes: a first regulating valve F1 and a second regulating valve F2, wherein the first regulating valve F1 is installed in the water supply pipeline 401a of the first circulation pipeline, and the second regulating valve F2 is installed in the water return pipeline 401b of the first circulation pipeline; and a third regulating valve F3 and a fourth regulating valve F4, wherein the third regulating valve F3 is installed in the water supply pipeline 402a of the second circulation pipeline, and the fourth regulating valve F4 is installed in the water return pipeline 402b of the second circulation pipeline. Preferably, each regulating valve is an electrically operated regulating valve.

[0036] In this embodiment, by controlling the opening degree of each regulating valve, it is possible to switch between different heating modes. For example, when F1, F2, F3, and F4 are all open, the mode switches to a combined heating mode of mine waste heat and heat pump, becoming... Figure 1 The heating mode shown allows for the combined operation of mine waste heat and a heat pump. In this mode, the load on each component can be adjusted by changing the opening of the valves. With F1 and F2 open and F3 and F4 closed, the system switches to direct waste heat heating mode. Figure 2 The heating mode is shown. With F3 and F4 open and F1 and F2 closed, it switches to heat pump unit heating mode, becoming... Figure 3 The heating mode shown.

[0037] Specifically, such as Figure 1 As shown, the combined operation mode of mine waste heat and heat pump (combined operation of direct heating and direct cooling modes) includes two modes: Mode 1 and Mode 2. Mode 1 operates when regulating valves F1, F2, F3, and F4 are open and F5 and F6 are closed. In this mode, the heating load of the mine waste heat and heat pump can be adjusted by regulating the openings of F1 and F3 in the supply water pipe and F2 and F4 in the return water pipe, thus enabling combined operation of direct heating and direct cooling modes. Mode 2 operates when all regulating valves F1, F2, F3, F4, F5, and F6 are open. In this mode, the heating load of the mine waste heat, heat pump, and other heat sources can be adjusted by regulating the openings of F1, F3, and F5 in the supply water pipe and F2, F4, F5, and F6 in the return water pipe, thus enabling combined operation of direct heating, direct cooling modes, and other heat sources.

[0038] like Figure 2As shown, the direct heating mode (direct heating mode) for mine waste heat includes two independent operation modes: Direct Heating Mode 1 and Direct Heating Mode 2. In Direct Heating Mode 1, with regulating valves F1 and F2 open and F3, F4, F5, and F6 closed, the system switches to Direct Heating Mode 1, using return air waste heat for direct heating when the heating load is low. In Direct Heating Mode 2, with regulating valves F1, F2, F5, and F6 open and F3 and F4 closed, the system switches to Direct Heating Mode 2. This mode is suitable for systems that couple other heat sources (such as clean energy sources like solar energy or conventional heat sources) when the heating load increases and direct return air waste heat is insufficient. In this mode, the opening degrees of F1 and F5 in the supply water pipe and F2 and F6 in the return water pipe are adjusted to regulate the heating load of the return air waste heat and other heat sources, ensuring optimal operation.

[0039] like Figure 3 As shown, when regulating valves F1, F2, F5, and F6 are closed and F3 and F4 are open, the system switches to the heat pump unit heating mode (direct cooling mode).

[0040] like Figure 1 As shown, the first heat source unit 1 includes components such as a return air heat exchanger 101, a return air diffusion tower 102, a fan unit 103, and a return air heat exchange platform 104. The return air heat exchanger 101 is located at the return air diffusion tower 102, which communicates with the return air shaft (not shown in the figure), and can be specifically located at the air outlet of the return air diffusion tower 102. Typically, the return air diffusion tower 102 is located at the outlet of the return air shaft, and the fan unit 103 is installed inside the return air diffusion tower 102. According to the relevant provisions of the "Coal Mine Safety Regulations," the fan unit 103 must be equipped with two sets of main ventilation fans with equal capacity, one of which serves as a backup. The backup ventilation fan must be able to start within 10 minutes. This ensures that if one set of ventilation fans fails, the other backup fan can be activated within 10 minutes, guaranteeing the continuous operation of the mine ventilation system. The main function of the return air diffuser tower is to reduce the wind speed of the mine return air and reduce the mechanical pressure loss of the fan. Its height design must take into account the airflow interference to surrounding facilities and personnel, and ensure the minimum safe distance. When the mine return air rises from the bottom of the return air shaft to the return air outlet, the high-temperature return air is discharged into the atmosphere after heat exchange in the return air diffuser tower 102.

[0041] In this embodiment, a return air heat exchange platform 104 is provided above the return air diffusion tower 102. This platform is a highly efficient energy recovery facility, primarily used to recover and utilize the waste heat from the mine return air during winter. The mine return air is introduced into the return air heat exchange platform 104 through the return air duct of the return air diffusion tower 102, and then enters the interior of the return air heat exchanger 101. Preferably, the return air heat exchanger 101 is a partition-type mine return air heat exchanger, where the mine return air and the heat extraction medium flow separately through a partition, allowing heat exchange between them. During this heat exchange, the temperature of the mine return air decreases, while the temperature of the heat extraction medium increases, thereby collecting the waste heat from the mine return air. More preferably, the return air heat exchanger is a partition-type return air heat exchanger with a heat exchange capacity surplus coefficient of 1.15 to 1.25.

[0042] like Figures 1 to 3 As shown, the air intake heating unit 3 includes a mine shaft air heating unit 301 and a shaft house 302. The shaft house 302 is located above the air intake shaft 5 and is connected to the air intake shaft 5. The mine shaft air heating unit 301 can be installed at the air intake of the shaft house 302. After the mine shaft air heating unit 301 heats the fresh air, the fresh air that reaches the target temperature enters the air intake shaft 5 through the shaft house 302, thereby achieving antifreeze protection for the shaft of the air intake shaft.

[0043] like Figure 1 and Figure 3 As shown, the heat pump unit 2 includes an evaporator 201, a compressor 202, a condenser 203, and an expansion valve 204, which are connected in series by a fourth circulation pipeline. The inlet and outlet of the evaporator 201 on the heat source side are connected to the supply water pipeline 402a and the return water pipeline 402b of the second circulation pipeline, respectively, and the outlet and inlet of the evaporator 201 on the heat pump working fluid side are connected to the supply water pipeline 404a and the return water pipeline 404b of the fourth circulation pipeline, respectively. Furthermore, the inlet and outlet of the condenser 203 on the heat pump working fluid side are connected to the supply water pipeline 404a and the return water pipeline 404b of the fourth circulation pipeline 404, respectively, and the outlet and inlet of the condenser 203 on the heating medium side are connected to the supply water pipeline 403a and the return water pipeline 403b of the third circulation pipeline, respectively. The media flowing in each circulation pipeline only exchange heat and do not mix. In this embodiment, the medium flowing in the first circulation pipeline is the heat extraction medium supplied from the first heat source section 1 to the air intake heating section 3; the medium flowing in the second circulation pipeline is the heat extraction medium supplied from the first heat source section 1 to the heat pump section 2; the medium flowing in the third circulation pipeline is the heat supply medium supplied from the heat pump section 2 to the air intake heating section 3; and the medium flowing in the fourth circulation pipeline is the heat pump working fluid. The heat pump working fluid first exchanges heat with the heat extraction medium in the evaporator 201 and then exchanges heat with the heat supply medium in the condenser 203.

[0044] like Figures 1 to 3As shown, the direct heating and cooling coupled multi-heat source wellbore antifreeze system also includes a circulating water pump, with at least one circulating water pump installed in the return water line of at least one of the circulating pipelines. For example, it could be as follows: Figure 1 As shown, a first circulation pump P1 is installed in the return water pipe 401b of the first circulation pipeline, and a second circulation pump P2 is installed in the return water pipe 403b of the third circulation pipeline. The main function of the circulation pump is to drive the various media to continuously circulate in the closed pipeline through the centrifugal force or pressure difference generated by the rotation of the impeller, so as to ensure the effective transfer and distribution of heat or cold, optimize the heat exchange efficiency in the system, and ensure the efficient and stable operation of the circulation system.

[0045] like Figure 1 and Figure 2 As shown, the direct-heating and direct-cooling coupled multi-heat-source wellbore antifreeze system also includes a second heat source section 6, which is connected to the air intake heating section 3 via a fifth circulation pipeline. The heat exchange medium flowing through the second heat source section 6 is transported to the air intake heating section 3 via the fifth circulation pipeline to exchange heat between the heat exchange medium and the fresh air. Specifically, the second heat source section 6 can be a supplementary heat source other than return air heating, such as waste heat from building heating or waste heat from air compressors, etc. A fifth regulating valve F5 is installed in the water supply pipeline 405a of the fifth circulation pipeline, and a sixth regulating valve F6 is installed in the water return pipeline 405b of the fifth circulation pipeline. By adjusting the opening of the fifth regulating valve F5 and the sixth regulating valve F6, the load of the second heat source section can be adjusted.

[0046] The above are merely embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A direct-heating and direct-cooling coupled multi-heat-source shaft antifreeze system, used to heat the fresh air entering the mine, characterized in that, include: The first heat source unit is located at the return air shaft of the mine and is used to exchange heat between the return air discharged from the return air shaft and the heat extraction medium. A heat pump section is connected to the first heat source section. The heat pump working fluid flowing in the heat pump section can exchange heat with the heat extraction medium and can also exchange heat with the heat supply medium. An air intake heating unit is provided at the air intake shaft of the mine. The air intake heating unit is connected to the first heat source unit and the heat pump unit, and is used to heat the fresh air by exchanging heat with the heat extraction medium that has undergone heat exchange in the first heat source unit and / or the heat supply medium that has undergone heat exchange in the heat pump unit.

2. The direct heating and cooling coupled multi-heat source wellbore antifreeze system according to claim 1, characterized in that, Also includes: The first circulation pipeline connects the first heat source section to the air intake heating section and is used to deliver the heat extraction medium to the air intake heating section; A second circulation pipeline connects the first heat source section to the heat pump section and is used to supply the heat extraction medium to the heat pump section; and The third circulation pipeline connects the heat pump section to the air intake heating section and is used to supply the heating medium to the air intake heating section.

3. The direct heating and cooling coupled multi-heat source wellbore antifreeze system according to claim 2, characterized in that, Also includes: The first regulating valve is installed in the water supply pipeline of the first circulation pipeline; The second regulating valve is installed in the return water pipe of the first circulation pipe; A third regulating valve is installed in the water supply line of the second circulation pipeline; and The fourth regulating valve is located in the return water pipe of the second circulation pipe.

4. The direct heating and cooling coupled multi-heat source wellbore antifreeze system according to claim 1, characterized in that, The first heat source unit includes a return air heat exchanger, which is installed on the side wall of the return air heat exchange platform that is connected to the return air shaft.

5. The direct heating and cooling coupled multi-heat source wellbore antifreeze system according to claim 1, characterized in that, Also includes: The fan unit is located in the ventilation fan room connected to the return air shaft.

6. The direct heating and cooling coupled multi-heat source wellbore antifreeze system according to claim 1, characterized in that, The air intake heating unit includes a mine shaft air heating unit, which is installed in the shaft house connected to the air intake shaft.

7. The direct heating and cooling coupled multi-heat source wellbore antifreeze system according to claim 2, characterized in that, The heat pump unit includes an evaporator, a compressor, a condenser, and an expansion valve, which are connected in series by a fourth circulation pipeline. The inlet and outlet of the heat source side of the evaporator are respectively connected to the water supply pipeline and the water return pipeline of the second circulation pipeline, and the outlet and inlet of the heat pump working fluid side of the evaporator are respectively connected to the water supply pipeline and the water return pipeline of the fourth circulation pipeline. The inlet and outlet of the heat pump working fluid side of the condenser are respectively connected to the water supply pipeline and the water return pipeline of the fourth circulation pipeline, and the outlet and inlet of the heating medium side of the condenser are respectively connected to the water supply pipeline and the water return pipeline of the third circulation pipeline.

8. The direct heating and cooling coupled multi-heat source wellbore antifreeze system according to claim 2, characterized in that, At least one circulating water pump is provided in the return water line of at least one of the first circulating pipelines to the third circulating pipeline.

9. The direct heating and cooling coupled multi-heat source wellbore antifreeze system according to any one of claims 1-8, characterized in that, Also includes: The second heat source section is connected to the air intake heating section via the fifth circulation pipe. The heat exchange medium flowing in the second heat source section is transported to the air intake heating section via the fifth circulation pipe so that the heat exchange medium exchanges heat with the fresh air.

10. The direct heating and cooling coupled multi-heat source wellbore antifreeze system according to claim 9, characterized in that, Also includes: The fifth regulating valve is installed in the water supply pipeline of the fifth circulation pipeline; as well as The sixth regulating valve is located in the return water pipe of the fifth circulation pipe.

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