Mine heat exchange system with deep geothermal energy as power source

Abstract

The utility model discloses a mine heat exchange system with deep geothermal energy as a power source. The mine heat exchange system comprises a power device and a heat exchange device. The power device comprises a steam generating mechanism, a driving mechanism and a ground source heat pump, and the steam generating mechanism is connected with the driving mechanism and used for transmitting generated steam to the driving mechanism; the driving mechanism is connected with the geothermal source pump and used for pressurizing the received steam and then driving the geothermal source pump to work; the heat exchange device comprises a water inlet pipe, a water outlet pipe and a heat exchange pipe, and the water inlet pipe is connected with a heat dissipation belt of the mine goaf and used for injecting water into the mine goaf; one end of the water outlet pipe is connected with a water accumulation area of the mine goaf, the other end of the water outlet pipe is fixedly connected with the geothermal source pump, and accumulated water in the mine goaf is pumped out from the water accumulation area through the water outlet pipe under the power action of the geothermal source pump; one end of the heat exchange pipe is connected with the geothermal source pump, the other end of the heat exchange pipe is connected with the heat utilization unit, and accumulated water in the goaf is pumped out along the water outlet pipe and pumped into the heat utilization unit along the heat exchange pipe under power driving of the geothermal source pump.

Description

Technical Field

[0001] The utility model relates to the technical field of mine cooling, in particular to a mine heat exchange system using deep geothermal energy as a power source. Background Art

[0002] With the depletion of shallow coal resources, mine production has gradually shifted to deeper areas. Accidents caused by high temperatures frequently occur during deep mining. Heat damage to coal mining faces is a common problem in deep mines, which seriously threatens the health and safety of operators.

[0003] In order to alleviate the high temperature problem of the working face and utilize the heat energy, before taking cooling measures, it is necessary to first determine the heat source of the coal mining working face and provide a reasonable method and approach for the utilization of heat damage management resources. Among the many heat sources of the coal mining working face, the goaf is an important heat source that cannot be ignored. On the one hand, the airflow exchanges heat with the high-temperature coal rock, and the temperature rises and flows back to the coal mining working face; on the other hand, it promotes the oxidation of the coal in the goaf, and even causes the coal to spontaneously combust, thereby releasing a large amount of heat, which may also be brought into the working face through various channels. At present, the energy consumption of the mine cooling system is large, the effect is poor, and the heat damage source cannot be solved in a targeted manner.

[0004] Therefore, how to reduce the impact of heat generated in the goaf on the working face and try to utilize it has become a key issue that needs to be solved in the process of sustainable development of mines and green mine construction. There is an urgent need for a mine heat exchange system that can respond to and utilize the heat source of the goaf to solve the above problems. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model provides a mine heat exchange system using deep geothermal energy as a power source.

[0006] The technical solution of the utility model is:

[0007] A mine heat exchange system using deep geothermal energy as a power source comprises a power device and a heat exchange device; the power device comprises a steam generating mechanism, a driving mechanism and a geothermal heat pump, the steam generating mechanism is connected to the driving mechanism and is used to transmit the generated steam to the driving mechanism; the driving mechanism is connected to the geothermal source pump and is used to pressurize the received steam and drive the geothermal source pump to operate; the heat exchange device comprises a water inlet pipe, a water outlet pipe and a heat exchange pipe, the water inlet pipe is connected to the heat dissipation belt of the mine goaf and is used to inject water into the mine goaf; one end of the water outlet pipe is connected to the water accumulation area of ​​the mine goaf, and the other end is fixedly connected to the geothermal source pump, under the power of the geothermal source pump, the accumulated water in the mine goaf is pumped out from the water accumulation area through the water outlet pipe; one end of the heat exchange pipe is connected to the geothermal source pump, and the other end is connected to a heat using unit, under the power drive of the geothermal source pump, the accumulated water in the goaf is pumped out along the water outlet pipe and pumped into the heat using unit along the heat exchange pipe.

[0008] Furthermore, the steam generating mechanism includes an injection pipe, a drilling channel, a deep heat block, and a steam delivery pipe; the deep heat block is generally located more than two kilometers below the coal seam, and the drilling channel passes through multiple deep heat blocks, and its two ends are respectively connected to the injection pipe and the steam delivery pipe.

[0009] Furthermore, the injection pipe is arranged at the pit bottom parking lot of the mine, and extends from the pit bottom parking lot to the underground, and the end thereof deep underground is connected to the drilling channel.

[0010] Furthermore, the injection pipe is provided with a one-way valve at one end thereof close to the pit bottom parking lot.

[0011] Furthermore, the steam delivery pipe includes a core pipe, a heat-insulating layer and an outer protective pipe; the heat-insulating layer is arranged between the core pipe and the outer protective pipe and is made of heat-insulating material.

[0012] Furthermore, the heat-using unit is provided with a drain pipe or a circulating water pipe, and the water inlet pipe and / or the liquid injection pipe are connected to the drain pipe or the circulating water pipe of the heat-using unit for recycling waste water or cooling water.

[0013] Furthermore, the mine goaf is provided with a heat dissipation zone, an oxidation heating zone and a suffocation zone, and the water inlet pipe is connected and fixed to the heat dissipation zone and / or the oxidation heating zone of the goaf.

[0014] Furthermore, the driving mechanism includes a compressor, a vortex supercharger and a geothermal source pump; the compressor is respectively connected to the steam delivery pipe and the vortex supercharger, and is used to compress the high-temperature and high-pressure steam transmitted by the steam delivery pipe and then transfer it to the vortex supercharger; the vortex supercharger is respectively connected to the compressor and the geothermal source pump, and is used to increase the gas pressure of the high-temperature and high-pressure steam, thereby driving the geothermal source pump to operate; the geothermal source pump is connected to the heat exchange device, and under the drive of the high-pressure steam, the geothermal source pump operates and synchronously drives the heat exchange device to operate.

[0015] Furthermore, the compressor, the scroll supercharger and the geothermal source pump are connected and fixed in sequence and then arranged on the ground surface.

[0016] Furthermore, the number of the geothermal heat source pumps is at least three, and the multiple geothermal heat pumps are connected in parallel.

[0017] The beneficial effects of the utility model are:

[0018] 1. The technical solution disclosed in the utility model utilizes the heat pump technology based on the Carnot cycle principle to use deep geothermal heat as a power source to leverage and transfer the heat energy of the goaf, thereby achieving the regulation of the threat of spontaneous combustion in the goaf and the reduction of the ambient temperature of the adjacent working surface. This technical solution not only replaces the waste heat in the goaf to provide heat to users, solves the problem of low efficiency of geothermal power generation, reduces the risk of spontaneous combustion of coal gangue in the goaf, but also reduces the temperature under the mine and improves the air environment of the mine.

[0019] 2. The technical solution disclosed by the utility model is that the circulating cooling water after work flows back to the injection pipe or the water inlet pipe along the pipeline arranged on the ground through the action of gravity, without the need for any external force to drive it, thereby reducing energy consumption, improving the utilization rate of groundwater in the goaf, reducing the consumption of groundwater resources in the goaf, and protecting and saving groundwater resources.

[0020] 3. The technical solution disclosed in the utility model uses geothermal power to achieve heat exchange. The high-temperature and high-pressure water vapor obtained from the deep heat block deep in the stratum drives the turbo compressor to work. The compression energy can obtain four times its own thermal energy from the underground, and the energy utilization efficiency is greatly improved after being pressurized by the vortex supercharger. At the same time, installing a one-way valve on the injection pipe can reduce the injection of circulating liquid or evaporating liquid and improve the steam utilization efficiency.

[0021] 4. The technical solution disclosed in this utility model, the ground source heat pump and compressor system is an efficient, environmentally friendly and sustainable energy recovery method, which is increasingly valued by the industry and the government. Using ground source heat pumps and compressors to obtain underground heat energy not only saves a lot of costs and energy for industrial facilities, cities and other related populations, but also reduces carbon emissions from industrial facilities and cities, thereby reducing pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 : Schematic diagram of the heat exchange system structure in an exemplary embodiment;

[0023] Figure 2 : A schematic diagram of a three-dimensional cross-sectional structure of a heat exchange system in an exemplary embodiment;

[0024] Figure 3 : Schematic diagram of the temperature-guided measurement and control drill bit structure in an exemplary embodiment;

[0025] Figure 4 : Schematic diagram of the rock classification method in the exemplary embodiment.

[0026] Explanation of symbols

[0027] 1-injection pipe, 2-drilling channel, 3-deep heat block, 4-steam transmission pipe, 5-ground source heat pump, 6-compressor, 7-vortex turbocharger, 8-check valve, 9-water inlet pipe, 10-water outlet pipe, 11-heat exchange pipe, 12-heat unit, 13-circulating water branch pipe, 14-heat dissipation belt, 15-oxidation heating belt, 16-asphyxiation belt; 17-temperature-guided measurement and control drill bit, 18-pressure sensor, 19-temperature sensor, 20-signal transmission device, 21-roller drill bit. DETAILED DESCRIPTION

[0028] The present invention is described in detail below by way of embodiments in conjunction with the accompanying drawings.

[0029] As attached Figure 1 To Attachment Figure 4 As shown, this embodiment records a mine heat exchange system using deep geothermal energy as a power source, including a power device and a heat exchange device.

[0030] The power device includes a liquid injection pipe, a drilling channel, a deep heat block, a steam delivery pipe, and a driving mechanism.

[0031] The injection pipe is arranged at the pit bottom parking lot, extending from the pit bottom parking lot to the underground, and one end thereof penetrating into the underground is connected with the drilling channel.

[0032] The injection pipe is used to transport circulating liquid or evaporating liquid. In order to prevent steam from rising and escaping from the pipe mouth of the injection pipe and ensure the normal flow of circulating liquid or evaporating liquid, it is preferred that the injection pipe is provided with at least one one-way valve at one end thereof close to the bottom of the well.

[0033] In this embodiment, the one-way valve adopts the H11W one-way valve produced by Zhejiang Yongxiao Valve Manufacturing Co., Ltd., which can effectively prevent the high-temperature steam generated by the deep heat block from circulating upward, thereby reducing the amount of circulating liquid or evaporating liquid input into the injection pipe.

[0034] Further preferably, the injection pipe is made of seamless steel pipe, which is suitable for geothermal environment and provides reliable pressure bearing and corrosion resistance.

[0035] Deep heat blocks are generally located more than two kilometers below the coal seam. The drilling channel runs through multiple deep heat blocks, thereby connecting multiple deep heat blocks in series.

[0036] One end of the steam delivery pipe that goes deep into the ground is connected to the drilled channel, and the other end extends out of the ground and is fixedly connected to the driving mechanism.

[0037] Due to the high temperature heating effect of the deep heat block, the high temperature and high pressure steam generated by the vaporization of the circulating liquid or the evaporating liquid is transported to the surface through the steam delivery pipe. In order to maintain the high temperature and high pressure state of the steam, the steam delivery pipe at least includes a core pipe, an insulation layer and an outer protective pipe; the insulation layer is arranged between the core pipe and the outer protective pipe, and is preferably made of insulation materials such as glass wool and aluminum foil; the core pipe and the outer protective pipe are preferably made of seamless steel pipes.

[0038] The driving mechanism includes a compressor, a scroll supercharger and a geothermal source pump.

[0039] The compressor is connected to the steam delivery pipe and the vortex supercharger respectively, and is used for compressing the high-temperature and high-pressure steam transmitted by the steam delivery pipe and then transferring it to the vortex supercharger.

[0040] The vortex supercharger is connected to the compressor and the geothermal source pump respectively to further increase the gas pressure of the high-temperature and high-pressure steam, thereby driving the geothermal source pump to operate.

[0041] The geothermal source pump is connected to the heat exchange device. Driven by high-pressure steam, the geothermal source pump operates and synchronously drives the heat exchange device to operate.

[0042] The heat exchange device comprises a water inlet pipe, a water outlet pipe and a heat exchange pipe.

[0043] The water inlet pipe is connected to the heat dissipation belt of the mine goaf and is used to inject water into the mine goaf.

[0044] Preferably, the water inlet pipe can be arranged to be connected to the waste water pipe or circulating water pipe of the heat unit, so as to realize the recycling of waste water or cooling water.

[0045] One end of the outlet pipe is connected to the water accumulation area in the goaf, and the other end is fixedly connected to the geothermal source pump. Under the power of the geothermal source pump, the high-temperature accumulated water in the goaf of the mine is pumped out from the water accumulation area through the outlet pipe.

[0046] One end of the heat exchange tube is connected to the geothermal source pump, and the other end is connected to the heat unit. Driven by the geothermal source pump, the accumulated water in the goaf is pumped out along the outlet pipe and pumped into the heat unit along the heat exchange tube.

[0047] The heat unit can be set according to actual production and living needs, such as providing heating for building communities, schools, construction sites, etc.

[0048] In this embodiment, as a preferred method:

[0049] 1. The compressor, the scroll supercharger and the geothermal source pump are connected and fixed in sequence and then installed on the ground surface.

[0050] 2. The circulating water after use by the heat unit can be diverted through a three-way pipe, and circulating water branches are set up respectively. The circulating water branches are connected to the injection pipe of the power unit and the water inlet pipe of the heat exchanger, and corresponding valves are set up to make full use of the circulating water or waste water;

[0051] Among them, the circulating water branch pipe connected to the injection pipe is connected to the injection pipe extending in the bottom of the mine through the mine shaft.

[0052] 3. Use existing tunnels to arrange water inlet pipes near the goaf. The water inlet pipes are connected to the heat dissipation zone of the goaf. Water flows into the heat dissipation zone and the oxidation warming zone of the goaf due to its own gravity. The oxidation warming zone is connected to the water outlet pipe and transported back to the ground through a water pump, so that cold water can pass through the heat dissipation zone and the oxygen warming zone and obtain heat from them.

[0053] 4. The vortex supercharger uses a new type of vortex supercharger designed by Doublestar Luohe Zhongyuan Machinery Co., Ltd. The vortex supercharger is designed based on the vortex tube principle and can increase the gas pressure without power.

[0054] 5. Circulating liquid or evaporating liquid specifically refers to clean water or fluorine-containing medium.

[0055] The following is a further description of the principle or application of the heat exchange system disclosed in this embodiment:

[0056] 1. The compressor can further increase the steam pressure and temperature in the steam delivery pipe through compression, turning the steam into a high-temperature and high-pressure gaseous medium, thereby generating heat energy several times the compression energy, and directly driving the ground source heat pump to work after being pressurized by the vortex supercharger;

[0057] 2. The vortex supercharger uses the high-temperature and high-pressure gaseous medium output by the compressor to continuously generate power through the viscous effect of the fluid on the solid surface, driving the airflow to rotate at high speed to generate a vortex airflow, which is ejected at high speed after being pressurized, directly driving the geothermal heat pump to work.

[0058] 3. Inject the circulating liquid or evaporating liquid into the injection pipe from the bottom of the well. The circulating liquid or evaporating liquid is injected once and controlled by a one-way valve. Under the action of gravity, it spontaneously flows into the deep heat block, and the steam cannot flow upward. Therefore, the injection of circulating liquid or evaporating liquid can be reduced.

[0059] 4. The ground source heat pump uses the high-temperature and high-pressure water vapor generated by the vortex supercharger as its power. It takes advantage of the fact that the underground temperature is more stable than the ground temperature to pump the high-temperature accumulated water in the coal mine goaf to the ground. The heat pump is used to exchange heat with the refrigerant of the indoor and outdoor units, and heat is provided to heat-using units such as cities and ground buildings through heat exchange pipes.

[0060] The cold water produced by the heat unit flows back to the deep underground heat block or goaf through the injection pipe or the water inlet pipe, thereby continuously providing heat source for the ground source heat pump and achieving the purpose of heat exchange in the goaf.

[0061] 5. The power of the existing relatively mature large-scale ground source heat pump units is generally around 500kw. This embodiment uses multiple large-scale ground source heat pump units in parallel to meet operational needs.

[0062] 6. Coefficient of Performance, or COP for short, is one of the important indicators for measuring the performance of a ground-source heat pump. It indicates the cooling or heating effect generated by a unit of electricity input. A higher energy efficiency ratio means higher energy utilization and lower operating costs. When an ordinary ground-source heat pump is running in winter, the COP is about 4.2, which means that 4 kW of heat energy can be obtained by investing 1 kW of electricity. When running in summer, the COP can reach 5.3, which means that 5 kW of energy can be obtained by investing 1 kW of electricity. By analogy, this embodiment is based on this principle, and further analogically obtains that the stable energy efficiency ratio of the ground-source heat pump is about 4, thereby being able to generate heat energy about four times the compression energy.

[0063] 7. By arranging oxygen meters and anemometers in the goaf, the oxygen concentration and wind speed in the goaf are measured respectively. Based on the division basis of the three spontaneous combustion zones in the goaf, the tropical zone of the goaf is divided into the heat dissipation zone, the oxidation warming zone and the asphyxiation zone. The specific division basis is:

[0064] Table of three zones of spontaneous combustion in goaf

[0065] Spontaneous combustion zone in goaf Depth range Oxygen concentration Wind speed temperature Cooling belt 50m or less <18％ >0.2m / s ≦35℃ Oxidation warming zone 50m-200m 18％ 0.2m / s 50-60℃ Choking belt More than 200 meters ≦12％ ≦0.1m / s ≧70℃

[0066] The division of the three spontaneous combustion zones in the goaf is based on oxygen concentration and temperature rise. There are now rich and complete three-zone range division standards. According to the properties of the three zones, this embodiment focuses on the oxidation temperature rise zone, which has the most important impact on the temperature rise of the working face and is also the zone with the highest risk of spontaneous combustion in the goaf.

[0067] The above data content is mainly based on standard and normative documents such as "Coal Mine Safety Regulations" and "Coal Mine Safety Provisions".

[0068] The depth range and oxygen concentration below the value in the above table refer to the relevant standards of most coal mines, and in the actual application process, it is necessary to analyze in combination with specific circumstances. In the prevention and control of spontaneous combustion in coal mines, it is necessary to jointly analyze and judge based on different geological conditions, coal body properties, mining methods and other factors to determine the range of spontaneous combustion zones and prevention and control measures for each mine, so as to ensure the safety of coal mine production to the greatest extent.

[0069] The heat exchange system disclosed in this embodiment is further described below through operation steps:

[0070] S1, through ultrasonic reflection and other technologies to detect the strata, to obtain the thickness of the lithosphere and the Moho depth of the deep heat block. Among them, the shallow Moho depth means that the deep heat source is closer to the surface, which is conducive to the upward conduction of deep heat.

[0071] S2, obtain the geothermal gradient of the area to be operated, the specific method is:

[0072] S201, drill a shallow well, install casing in the well, seal the annular space with cement slurry, fill the casing with water, install the wellhead device, and repeatedly use thermistor probe to measure the ground temperature until thermal equilibrium is reached. The temperature change curve is the steady-state geothermal gradient;

[0073] S202, if an area has a high geothermal gradient, for example ≥35℃ / km, the ground temperature in the deep area increases faster with increasing depth, and rock bodies with higher temperatures can be obtained in relatively shallow areas.

[0074] S3, select the drill bit of appropriate material according to the type of rock to be drilled. Figure 4 A rock classification method is given.

[0075] The drilling bit preferably adopts a temperature-guided measurement and control drill bit, which is equipped with a rotating device, a roller drill bit, a pressure sensor and a temperature sensor. The drill bit direction can be automatically adjusted and directional drilling can be performed according to the surrounding temperature. The drill bit position can be changed at will within 180 degrees, and excavation can be carried out in the direction of the highest heat point.

[0076] In order to ensure the accuracy and stability of the temperature-guided measurement and control drill bit signal transmission, a signal transmission device is set up according to the near-drill bit continuous wave reflection analysis and signal extraction algorithm (Bian Hailong, Su Yinao, Peng Liexin. Continuous wave reflection analysis and signal extraction algorithm near the drill bit [J]. Measurement and Control Technology, 2022, 41(05): 100-105.) to ensure that the temperature-guided measurement and control drill bit signal can reach the control center in time.

[0077] S4, build a drilling platform at the bottom of the mine in a stable location, and develop and extend the mine to the deep underground hot block of about 2,000 meters at a location with a higher geothermal gradient.

[0078] The deep heat block is connected to the injection pipe and the steam delivery pipe through the drilling channel. The diameter of the injection pipe is preferably a 5-inch seamless steel pipe. The size of the injection pipe can be selected according to the actual situation under the premise of complying with relevant standards and specifications and ensuring safe production and environmental protection.

[0079] S5. After the coal mining face is mined, the top rock layer will generally break and fall, filling the goaf area, but it cannot be completely filled. In the low-lying area, water from the upper layer or the same layer will be retained to replenish the goaf, thus forming old water accumulation. The oxidation and heat of the coal gangue will heat the water in the goaf.

[0080] Sensors and monitoring equipment are installed in the borehole, and Internet technology is used to realize intelligent data analysis. Various data during the drilling process are collected and analyzed, so as to realize real-time monitoring and processing of data such as water source location, hot water temperature, water pressure, and gasification rate.

[0081] S6, determine the layout orientation of the water inlet pipe and the water outlet pipe according to the location of the water accumulation area, then determine the mining location of the tunnel, and connect the water outlet pipe to the ground source heat pump.

[0082] Preferably, a water injection pipeline may be provided at the boundary of the goaf, surrounding the boundary, so that water flows toward the center of the goaf and converges, thereby increasing the support and stability of the ore bed.

[0083] The following is a further description of the present invention through actual implementation cases:

[0084] A mining area in Inner Mongolia Autonomous Region. The goaf has a strike length of about 960m. Due to the large mining depth, the rock temperature in the mine reaches up to 44.8℃, which is the main underground heat source. The mine water inflow is 1000~1500m 3 / h, water temperature is 51℃, and air temperature in the mine environment is 31℃.

[0085] In order to effectively reduce the temperature of the mine, improve its production efficiency, reduce costs and alleviate the impact on the environment, through a combination of field observation and numerical simulation, it was found that the oxidation zone of the goaf is roughly within the range of 35 to 132 meters from the working face on the air inlet side and 30 to 115 meters from the working face on the return air side.

[0086] The mine area utilizes the heat exchange system disclosed in the above embodiment to recover heat energy from groundwater and transfer it to mining equipment and miners' housing.

[0087] After the system was put into operation for 48 hours, the air temperature of the mine environment dropped to 24.7℃, and the temperature of the oxidized zone rock formation dropped slightly, effectively controlling the temperature of the mine area and avoiding spontaneous combustion in the goaf. At the same time, the system can generate up to 240,000 kilowatts per hour of heat, which is enough to meet the heat energy required for industrial production and miners' living in the mine, reducing the local demand for traditional fossil energy such as natural gas and coal, and alleviating pollution to the environment.

[0088] The compressor and ground source heat pump system used by the mine, in addition to heating and cooling the miners' residential areas and industrial facilities, can also be used for different geothermal resource recovery applications, such as recycling waste heat from lithium mine wastewater, recycling waste heat from tungsten mine wastewater, and recycling waste heat from copper mine wastewater, etc. It can be seen that ground source heat pumps and compressors also have a wide range of applications in other different industrial applications.

[0089] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A mine heat exchange system using deep geothermal energy as a power source, characterized in that: Including power unit and heat exchange unit; The power device includes a steam generating mechanism, a driving mechanism and a ground source heat pump. The steam generating mechanism is connected to the driving mechanism and is used to transmit the generated steam to the driving mechanism; The driving mechanism is connected to the geothermal source pump and is used to pressurize the received steam and then drive the geothermal source pump to operate; The heat exchange device comprises a water inlet pipe, a water outlet pipe and a heat exchange pipe. The water inlet pipe is connected to the heat dissipation belt of the mine goaf and is used to inject water into the mine goaf; One end of the water outlet pipe is connected to the water accumulation area of ​​the mine goaf, and the other end is fixedly connected to the geothermal source pump. Under the power of the geothermal source pump, the accumulated water in the mine goaf is pumped out from the water accumulation area through the water outlet pipe. One end of the heat exchange tube is connected to the geothermal source pump, and the other end is connected to the heat using unit. Driven by the geothermal source pump, the accumulated water in the goaf is pumped out along the outlet pipe and pumped into the heat using unit along the heat exchange tube.

2. A mine heat exchange system using deep geothermal energy as a power source according to claim 1, characterized in that: The steam generating mechanism comprises a liquid injection pipe, a drilling channel, a deep heat block, and a steam delivery pipe; The drilling channel passes through a plurality of the deep heat blocks, and two ends thereof are respectively connected to the liquid injection pipe and the steam delivery pipe.

3. A mine heat exchange system using deep geothermal energy as a power source according to claim 2, characterized in that: The injection pipe is arranged at the pit bottom parking lot of the mine and extends underground from the pit bottom parking lot, and one end of the injection pipe which penetrates underground is connected with the drilling channel.

4. A mine heat exchange system using deep geothermal energy as a power source according to claim 3, characterized in that: The injection pipe is provided with a one-way valve at one end thereof close to the pit bottom parking lot.

5. A mine heat exchange system using deep geothermal energy as a power source according to claim 2, characterized in that: The steam delivery pipe comprises a core pipe, a heat-insulating layer and an outer protective pipe; the heat-insulating layer is arranged between the core pipe and the outer protective pipe and is made of heat-insulating material.

6. A mine heat exchange system using deep geothermal energy as a power source according to any one of claims 2 to 5, characterized in that: The heat-using unit is provided with a drainage pipe or a circulating water pipe, and the water inlet pipe and / or the liquid injection pipe are connected to the drainage pipe or the circulating water pipe of the heat-using unit for recycling waste water or cooling water.

7. A mine heat exchange system using deep geothermal energy as a power source according to any one of claims 1 to 5, characterized in that: The mine goaf is provided with a heat dissipation zone, an oxidation heating zone and a suffocation zone, and the water inlet pipe is connected and fixed to the heat dissipation zone and / or the oxidation heating zone of the goaf.

8. A mine heat exchange system using deep geothermal energy as a power source according to any one of claims 2 to 5, characterized in that: The driving mechanism includes a compressor, a scroll supercharger and a geothermal source pump; The compressor is connected to the steam delivery pipe and the vortex supercharger respectively, and is used to compress the high-temperature and high-pressure steam transmitted by the steam delivery pipe and then transfer it to the vortex supercharger; The vortex supercharger is connected to the compressor and the geothermal source pump respectively, and is used to increase the gas pressure of the high-temperature and high-pressure steam, thereby driving the geothermal source pump to operate; The geothermal source pump is connected to the heat exchange device. Driven by high-pressure steam, the geothermal source pump operates and synchronously drives the heat exchange device to operate.

9. A mine heat exchange system using deep geothermal energy as a power source according to claim 8, characterized in that: The compressor, the vortex supercharger and the geothermal source pump are connected and fixed in sequence and then arranged on the ground surface.

10. A mine heat exchange system using deep geothermal energy as a power source according to claim 8, characterized in that: The number of the geothermal heat source pumps is at least three, and the multiple geothermal heat pumps are connected in parallel.

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