Heat pipe coupled solar thermal heat storage and supply system

Abstract

The utility model relates to heat pipe coupling solar energy heat storage heating system for mine shaft freezing prevention, its characterized in that, possess: first heat exchange part, its one end is located in air inlet air duct, other end is located in return air duct, with the fresh air in air inlet air duct and the return air in return air duct carry out heat exchange, heat collection and heat storage part, it includes: heat storage pond, it is located in mine periphery ground surface or underground, and solar energy heat collection device is connected with heat storage pond, is used for with the help liquid medium will light heat energy delivery to store in heat storage pond, and second heat exchange part is located in air inlet air duct, and is connected with heat collection and heat storage part, second heat exchange part uses the liquid medium stored in heat storage pond, carries out second heat exchange to the fresh air after carrying out heat exchange in first heat exchange part.

Description

Technical Field

[0001] This utility model relates to heat pipe heating systems, and in particular to heat pipe coupled solar thermal storage heating systems. Background Technology

[0002] According to relevant regulations, during the construction of coal mines and other mines, it is explicitly required that the air temperature below the mine's intake air shaft must be maintained above 2℃. Mine return air has a large volume, stable temperature, high relative humidity, and high enthalpy, containing a large amount of high-quality low-temperature heat energy, making it a waste heat resource with extremely high utilization value. Therefore, heat pipe heat exchangers are sometimes used to design shaft anti-freezing systems, utilizing the waste heat from the mine return air (exhaust air). However, when outdoor ambient temperatures decrease and heating loads increase, the waste heat from the mine return air alone is sometimes insufficient to meet the heating requirements for shaft anti-freezing. Therefore, electric heating equipment is also installed in the mine ventilation ducts as a backup heat source to ensure that the mixed air temperature in the intake air shaft is ≥2℃. Utility Model Content

[0003] Problems to be solved by the utility model

[0004] Mine ventilation ducts, serving as the "throat" of a mine, are critical pathways for the transport and ventilation of personnel, equipment, and materials. They may contain explosive mixtures such as methane and coal dust, which can easily ignite upon contact with electrical sparks, mechanical friction, or high-temperature heat sources. Therefore, installing electric heating equipment in ventilation ducts poses significant safety hazards during operation. Furthermore, the need for high-explosion-proof electric heating equipment also increases costs. In addition, the high power consumption of electric heating equipment leads to a substantial increase in operating costs.

[0005] Solution for solving the problem

[0006] This utility model provides a heat pipe coupled solar thermal storage and heating system for mine shaft antifreeze. The system comprises: a first heat exchange section, one end of which is disposed in the air inlet duct and the other end in the air return duct, for exchanging heat with the fresh air in the air inlet duct and the return air in the air return duct; a heat collection and storage section, comprising: a heat storage tank disposed on the surface or underground around the mine; and a solar thermal collector connected to the heat storage tank for transferring solar thermal energy to the heat storage tank for storage using a liquid medium; and a second heat exchange section disposed in the air inlet duct and connected to the heat collection and storage section, wherein the second heat exchange section uses the liquid medium stored in the heat storage tank to perform a second heat exchange on the fresh air after the heat exchange in the first heat exchange section.

[0007] According to the heat pipe coupled solar thermal storage and heating system, the first heat exchange section adopts a heat pipe heat exchanger, which includes multiple heat pipes. The heat pipes are vacuum-sealed structures and are filled with heat exchange working fluid. One end of the heat pipe is set in the air inlet duct, and the other end is set in the air return duct.

[0008] According to the heat pipe coupled solar thermal storage and heating system, the effective heat transfer coefficient of the heat pipe heat exchanger is not less than 0.75, and the heat exchange medium of the heat pipe heat exchanger is water, ethylene glycol solution, acetone, ammonia or Freon.

[0009] According to the heat pipe coupled solar thermal storage and heating system, the second heat exchange section adopts a partition wall heat exchange structure, and the liquid medium transported from the thermal storage tank circulates in the internal pipe of the second heat exchange section, and heats the fresh air through the external fins of the second heat exchange section.

[0010] According to the heat pipe coupled solar thermal storage and heating system, the thermal storage tank is characterized in that it is filled with liquid or phase change material.

[0011] According to the heat pipe coupled solar thermal storage and heating system, the heat collection and storage unit further includes a mine water heat source heat collection device or a river or lake water heat source heat collection device, which uses a liquid medium to transport heat to the heat storage tank for storage.

[0012] According to the heat pipe coupled solar thermal storage and heating system, the heat collection and storage section further includes a circulation pump, and the circulation pump is respectively installed in the circulation pipeline between the thermal storage tank and the solar thermal collector and in the circulation pipeline between the thermal storage tank and the second heat exchange section.

[0013] According to the heat pipe coupled solar thermal storage and heating system, the thermal storage pool is divided into two or more temperature zones according to temperature, and the liquid medium in the high temperature zone is preferentially transported to the second heat exchange section for heat exchange, and the liquid medium that has undergone heat exchange in the second heat exchange section is returned to the low temperature zone of the thermal storage pool.

[0014] According to the heat pipe coupled solar thermal storage and heating system, it is characterized in that it further comprises a ventilation section, the ventilation section including a first fan disposed between the fresh air inlet in the air inlet duct and the first heat exchange section, and a second fan disposed between the return air well outlet in the return air duct and the first heat exchange section.

[0015] The heat pipe coupled solar thermal storage and heating system is characterized by further comprising a control unit, which controls the entire heat pipe coupled solar thermal storage and heating system.

[0016] Effects of the utility model

[0017] According to this utility model, a heat pipe coupled solar thermal storage and heating system with low operating energy consumption and high safety and reliability can be provided. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the heat pipe coupled solar thermal storage and heating system involved in this utility model. Detailed Implementation

[0019] 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.

[0020] like Figure 1 As shown, the intake air duct of the mine intake air shaft (hereinafter referred to as the intake air duct) and the return air duct of the mine return air shaft (hereinafter referred to as the return air duct) are set adjacent to each other. One end of the intake air duct is connected to the intake air shaft, and the other end is the fresh air inlet (fresh air equipment is not shown). One end of the return air duct is connected to the return air shaft, and the other end is the return air outlet. According to engineering practice, the intake air shaft and the return air shaft are located in the same site.

[0021] The heat pipe coupled solar thermal storage and heating system 1 involved in this embodiment includes: a first heat exchange section 11, a second heat exchange section 12, a heat collection and storage section 13, a ventilation section 14, and a control section 15.

[0022] The first heat exchange section 11, the second heat exchange section 12, the heat collection and storage section 13, the ventilation section 14, and the control section 15 will be described below.

[0023] <First Heat Exchange Section>

[0024] The first heat exchange section 11 is located at one end in the air inlet duct and at the other end in the air return duct, exchanging heat with the fresh air in the air inlet duct and the return air in the air return duct. The first heat exchange section 11 employs a heat pipe heat exchanger, comprising multiple heat pipes. Each heat pipe is a vacuum-sealed structure filled with a heat exchange medium. One end of each heat pipe is located in the air inlet duct, and the other end is located in the air return duct. The effective heat transfer coefficient of the heat pipe heat exchanger is not less than 0.75. The number of heat pipes is not specifically limited here and can be determined according to heat exchange requirements, pipe arrangement, and dimensions.

[0025] Heat pipe heat exchangers achieve heat transfer through the phase change cycle (evaporation-condensation) of the heat exchange medium. Specifically, the heat exchange medium inside the heat pipe at one end of the heat pipe heat exchanger exchanges heat with the mine return air. The heat exchange medium absorbs the heat from the mine return air and evaporates. The heated vaporized medium is transported at high speed to the other end of the heat pipe heat exchanger under the action of pressure difference, and exchanges heat with the fresh air entering the air inlet duct. At this time, the heat exchange medium condenses into a liquid due to heat release and is returned to one end of the heat pipe heat exchanger, where it is evaporated and vaporized again. This cycle is repeated, and the fresh air entering the air inlet duct is heated and its temperature rises.

[0026] The heat exchange medium used in heat pipe heat exchangers includes water, ethylene glycol solution, acetone, ammonia, or Freon, ensuring that the heat pipe heat exchanger can operate efficiently at very low temperatures (especially in cold regions).

[0027] <Second Heat Exchange Section>

[0028] The second heat exchange section 12 employs a surface heat exchanger, preferably a partitioned heat exchange structure, and is located in the air inlet duct, downstream of the first heat exchange section 11, and connected to the heat storage tank 131 described later. The high-temperature liquid medium supplied from the heat storage tank 131 circulates in the internal tubes of the second heat exchange section 12, and heats the fresh air via the external fins of the second heat exchange section 12.

[0029] <Heat Collection and Storage Section>

[0030] The heat collection and storage unit 13 includes a heat storage pool 131 and a solar collector 132. The heat storage pool 131 is located at a suitable surface or underground location around the mine, specifically determined by the mine's geological conditions, heat source type, and heating needs. For example, it could be a surface water pool, an underground soil heat storage body, or a buried pipe heat storage system. The heat storage pool 131 is filled with heat storage material, which can be sensible heat storage material or phase change heat storage material. For example, sensible heat storage material is a liquid such as water, storing heat based on temperature changes; phase change heat storage material is a phase change material such as paraffin wax or inorganic salts, utilizing the high latent heat and constant temperature characteristics of phase change materials for heat storage.

[0031] Alternatively, it is preferable to divide the thermal storage tank 131 into multiple temperature zones such as a high-temperature zone, a medium-temperature zone, and a low-temperature zone, and to use the heat from the high-temperature zone preferentially by using a layered heat extraction method to extend the heating time of the heat collection and storage unit 13.

[0032] A solar collector 132 is connected to a thermal storage tank 131, storing the year's solar thermal energy in the tank using a liquid medium. Specifically, the solar collector 132 is connected to the thermal storage tank 131 via a water supply pipe 134 and a return water pipe 135. The solar collector 132 absorbs solar radiation and heats its internal medium, such as water. The high-temperature medium flows into the thermal storage tank 131 (e.g., the high-temperature zone) through the water supply pipe 134, where its heat is stored. The low-temperature medium in the thermal storage tank 131 (e.g., the medium-temperature zone or the low-temperature zone) returns to the solar collector 132 through the return water pipe 135. This cycle continues, storing the heat energy collected by the solar collector 132 in the thermal storage tank 131.

[0033] The thermal storage tank 131 is connected to the heat exchange section 12 via a water supply pipe 136 and a water return pipe 137. When the heat exchange section 12 is working, the high-temperature liquid medium in the thermal storage tank 131 flows into the heat exchange section 12 via the water supply pipe 136 and exchanges heat with the fresh air in the heat exchange section 12. The medium with a lower temperature returns to the thermal storage tank 131 via the water return pipe 137, for example, to the medium-temperature zone or low-temperature zone in the thermal storage tank 131.

[0034] In addition, preferably, a circulation pump 139 is installed in the return water pipe 135 and a circulation pump 138 is installed in the return water pipe 137 to drive the circulation of the medium and ensure that heat can be effectively transferred.

[0035] The heat collection and storage unit 13 may also include other heat source collection devices 133, which, depending on the type of heat source around the mine, such as waste heat from mine water, river and lake water, industrial waste heat, and air heat energy, are stored in the heat storage tank 131 using a liquid medium. The other heat source collection devices 133 are connected to the heat storage tank 131 via a circulation pipeline, and a circulation pump is installed in the circulation pipeline.

[0036] Because the medium stored in the thermal storage tank 131 is at a high temperature, when there is a lot of heat output, the excess heat can be used for other high-temperature heat users, such as building heating and bathing.

[0037] As a solar-powered interseasonal thermal storage system, the collector and storage unit is safe, reliable, and free of safety hazards. It has a small installed capacity, requires less upstream power capacity, and only the circulating pump operates in the system, which greatly reduces operating energy consumption and saves operating costs.

[0038] Ventilation Department

[0039] The ventilation section 14 includes a fan 141 and a fan 142 for providing continuous and stable airflow. The fan 141 is located between the fresh air inlet in the air inlet duct and the first heat exchange section 11, and the fan 142 is located between the return air inlet in the return air duct and the first heat exchange section 11.

[0040] <Control Department>

[0041] The control unit 15 controls the first heat exchange unit 11, the second heat exchange unit 12, the heat collection and storage unit 13, and the ventilation unit 14. Additionally, pressure sensors and temperature sensors are installed in the fresh air intake duct and the mine return air duct, respectively. To ensure safe mine air intake, the control unit 15 monitors the airflow pressure flowing through the first heat exchange unit 11 and the second heat exchange unit 12, and controls the ventilation unit 14 to maintain a positive pressure state for the airflow flowing through the first heat exchange unit 11 and the second heat exchange unit 12. Furthermore, the control unit 15 monitors the temperature of the fresh air at the intake shaft inlet. If the temperature of the fresh air at the intake shaft inlet is lower than a first threshold, the control unit 15 activates the first heat exchange unit 11 and the second heat exchange unit 12. If the temperature at the intake shaft inlet is above the first threshold but below the second threshold, the control unit 15 activates the first heat exchange unit 11 to ensure that the mixed air temperature in the intake shaft is ≥2℃.

[0042] The heat pipe coupled solar thermal storage and heating system 1 also includes a maintenance passage (not shown). The maintenance passage can be set in the air inlet duct, and staff can regularly clean and maintain the first heat exchange section 11, the second heat exchange section 12, the ventilation section 14, etc. through the maintenance passage to avoid the heat exchange efficiency being reduced due to the pollution of each part by coal dust impurities and other chemical components in the air duct.

[0043] In addition, the horizontal distance between the return air outlet and the intake shaft opening should be no less than 30m to prevent the mine return air, after heat extraction, from returning underground.

[0044] The first heat exchange section 11, the second heat exchange section 12, the ventilation section 14, and all sensors have adopted corresponding explosion-proof measures in accordance with the relevant provisions of the current national standard "Code for Design of Electrical Installations in Explosive Atmospheres" GB50058.

[0045] 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 heat pipe coupled solar thermal storage and heating system for mine shaft antifreeze, characterized in that, have: The first heat exchange section has one end located in the air inlet duct and the other end located in the air return duct, and exchanges heat with the fresh air in the air inlet duct and the return air in the air return duct. A thermal collector and storage unit includes: a thermal storage tank located on the surface or underground surrounding a mine; and a solar thermal collector connected to the thermal storage tank for transferring solar thermal energy to the thermal storage tank via a liquid medium for storage; and... The second heat exchange section is located in the air inlet duct and connected to the heat collection and storage section. The second heat exchange section uses the liquid medium stored in the heat storage tank to perform a second heat exchange on the fresh air that has undergone heat exchange in the first heat exchange section.

2. The heat pipe coupled solar thermal storage and heating system according to claim 1, characterized in that, The first heat exchange section employs a heat pipe heat exchanger, comprising multiple heat pipes. The heat pipe is a vacuum-sealed structure and is filled with a heat exchange medium. One end of the heat pipe is located in the air inlet duct, and the other end is located in the air return duct.

3. The heat pipe coupled solar thermal storage and heating system according to claim 2, characterized in that, The effective heat transfer coefficient of the heat pipe heat exchanger is not less than 0.

75. The heat exchange medium of the heat pipe heat exchanger is water, ethylene glycol solution, acetone, ammonia, or Freon.

4. The heat pipe coupled solar thermal storage and heating system according to claim 1, characterized in that, The second heat exchange section adopts a partition wall heat exchange structure. The liquid medium transported from the heat storage tank circulates in the internal tube of the second heat exchange section and heats the fresh air through the external fins of the second heat exchange section.

5. The heat pipe coupled solar thermal storage and heating system according to claim 1, characterized in that, The thermal storage tank is filled with liquid or phase change material.

6. The heat pipe coupled solar thermal storage and heating system according to claim 1, characterized in that, The heat collection and storage unit also includes a mine water heat source heat collection device or a river or lake water heat source heat collection device, which uses a liquid medium to transport heat to the heat storage pool for storage.

7. The heat pipe coupled solar thermal storage and heating system according to claim 1, characterized in that, The heat collection and storage unit also includes circulation pumps, which are installed in the circulation pipeline between the heat storage tank and the solar collector and in the circulation pipeline between the heat storage tank and the second heat exchange unit.

8. The heat pipe coupled solar thermal storage and heating system according to claim 1, characterized in that, The thermal storage tank is divided into two or more temperature zones according to temperature. The liquid medium in the high-temperature zone is preferentially transported to the second heat exchange section for heat exchange, and the liquid medium that has undergone heat exchange in the second heat exchange section is returned to the low-temperature zone of the thermal storage tank.

9. The heat pipe coupled solar thermal storage and heating system according to claim 1, characterized in that, It also includes a ventilation section, which includes a first fan disposed between the fresh air inlet in the air inlet duct and the first heat exchange section, and a second fan disposed between the return air shaft outlet in the return air duct and the first heat exchange section.

10. The heat pipe coupled solar thermal storage and heating system according to claim 1, characterized in that, It also includes a control unit, which controls the entire heat pipe coupled solar thermal storage and heating system.

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