WO2021078306A1 - Mid-depth underground petrothermal heat supply system, and heat supplying method - Google Patents

Abstract

A mid-depth underground petrothermal heat supply system, comprising: at least one underground mid-depth rock and soil heat exchange system (1), an aboveground auxiliary thermal system (2), a heat supply terminus thermal circulation system (3), and a control system (4). When the temperature of a heat exchange medium that performs heat exchange in the underground mid-depth rock and soil heat exchange system (1) reaches a preset temperature, the heat exchange medium is transmitted to the heat supply terminus thermal circulation system (3) by means of a direct supply apparatus of the aboveground auxiliary thermal system (2). When the heat exchange medium does not reach the preset temperature, the heat exchange medium is heated by means of a heat exchange heat pump apparatus (21) of the aboveground auxiliary thermal system (2), and transmitted to the heat supply terminus thermal circulation system (3). The present invention solves the problem in existing water source heat pumps of environmental water pollution and insufficient heat source stability, and effectively prevents pollution of water resources and is able to provide a continuously stable heat source.

Description

Medium-deep underground rock heat type heating system and heating method Technical field

The invention relates to the technical field of geothermal energy development, in particular to a medium-deep underground rock-heat heating system and a medium-deep underground rock-heat heating method.

Background technique

Shallow geothermal energy is a depth range of 200m from the surface to the ground, and the temperature stored in water, soil, and rocks is below 25℃. The use of heat pump technology can be used to extract geothermal energy utilization technology for heating or cooling of buildings. . The shallow geothermal energy utilization system is mainly divided into one is a water source heat pump heating system, and the other is a ground source heat pump heating system. The former requires the extraction of groundwater, and has strict requirements on water temperature, water output, sediment content, same-layer recharge, and water pollution control, which have been restricted or even forbidden in many places; the latter requires heat to be balanced, but in the northern summer In areas with low cooling demand, the soil thermal compensation is seriously insufficient, making the heating effect of the ground source heat pump unsatisfactory.

The hot dry rock utilization technology that has emerged in recent years, "Geothermal Energy Terminology" (NB/T 10097-2018) defines it as an abnormally high temperature rock mass with no or only a small amount of fluid inside and a temperature higher than 180°C. Hot dry rock is mainly used for power generation internationally to distinguish the deep-seated hydrothermal geothermal technology used for heating. From the perspective of economic development and utilization, not all places have the conditions for hot dry rock mining. In terms of resource conditions and technical difficulty, the system does not have universal applicability.

Summary of the invention

In view of the potential water pollution of the traditional water source heat pump and the difficulty of recharging in the same layer, the insufficient heat compensation of the ground source heat pump, the economy of dry hot rock mining and the general applicability of the lack of universal applicability. The present invention proposes a medium-deep underground rock heating type heating system and heating method.

In order to solve the above technical problems, according to one aspect of the present invention, a medium-deep underground rock heating heating system is provided, including: at least one underground medium-deep rock-soil heat exchange system, an above-ground heat auxiliary system, and a heating terminal heat circulation system And control system;

Wherein, the underground mid-deep rock-soil heat exchange system is used to make the heat exchange medium exchange heat with the underground mid-deep rock and soil;

The above-ground thermal auxiliary system is connected to the underground mid-deep rock-soil heat exchange system, which includes:

The heat exchange temperature raising pumping device is used to raise the temperature of the heat exchange medium when the temperature of the heat exchange medium after the heat exchange is lower than the first preset temperature, and to increase the temperature of the heat exchange medium. The heat exchange medium is transported to the heat circulation system of the heating terminal; and

A direct supply device, configured to transport the heat exchange medium to the heat supply terminal heat circulation system when the temperature of the heat exchange medium after the heat exchange is greater than or equal to the first preset temperature;

The heat supply terminal heat circulation system is connected to the above-ground thermal auxiliary system to exchange heat with the heat exchange medium delivered by the above-ground thermal auxiliary system;

The control system is used for controlling the above-ground thermal auxiliary system according to the magnitude relationship between the temperature of the heat exchange medium and the first preset temperature.

Further, the underground mid-deep rock-soil heat exchange system includes: double-layer casing and high-efficiency heat exchange terminals;

Wherein, the double-layer sleeve includes an inner sleeve and an outer sleeve, the lower end of the outer sleeve is connected to the high-efficiency heat exchange terminal, and the heat exchange medium is injected by the inner sleeve, After the high-efficiency heat exchange terminal exchanges heat with the underground middle and deep rock and soil, it is transported to the above-ground thermal auxiliary system by the outer casing.

Further, the high-efficiency heat exchange terminal includes: a high-strength alloy sleeve, a high-efficiency heat exchanger and a high-efficiency heat transfer medium;

Wherein, the high-strength alloy sleeve is connected to the high-efficiency heat exchanger, and the high-efficiency heat transfer medium is filled between the high-strength alloy sleeve and the high-efficiency heat exchanger and the underground medium and deep rock soil To increase the heat exchange efficiency between the deep underground rock and soil and the heat exchange medium.

Further, a thermal insulation layer is further provided on the outer side of the upper part of the outer sleeve to prevent rapid loss of heat energy when the heat exchange medium flows through the surface of the outer sleeve.

Further, the medium-deep underground rock heating heating system further includes: a first three-way pipe, the first end of which is connected to the upper end of the outer casing, and the second end is connected to the heat exchange and temperature raising pumping device One end and the third end are connected to the end thermal cycle system; and

A second three-way pipe, the first end of which is connected to the upper end of the inner sleeve, the second end of which is connected to the one end of the heat exchange and temperature raising pumping device, and the third end of which is connected to the end thermal circulation system ；

The other end of the heat exchange and temperature raising pumping device is connected to the third end of the first tee through a first connecting pipe, and the other end is connected to the second tee through a second connecting pipe The third end of the tube.

Further, the control system includes a first temperature control device, a first control valve, a second control valve, a third control valve, and a second temperature control device;

Wherein, the first temperature control device is arranged at the first end of the first three-way pipe, the first control valve is arranged at the third end of the first three-way pipe, and the second control valve is arranged at the third end of the first three-way pipe. The valve is arranged at the second end of the second three-way pipe, the third control valve is arranged at the third end of the second three-way pipe, and the second temperature control device is arranged at the second connecting pipe ；

The second temperature control device controls the operation of the heat exchange temperature raising pumping device according to the temperature of the heat exchange medium in the second connecting pipe and a second preset temperature.

Further, a pipeline pump is provided at the first end of the first three-way pipe, the first end of the second three-way pipe, and the third end of the first three-way pipe for the heat exchange medium The transportation provides kinetic energy.

Further, the heat exchange and temperature raising pumping device includes: an evaporator, a compressor, and a condenser.

According to another aspect of the present invention, there is provided a medium-deep underground rock-heat heating method for use in the medium-deep underground rock-heat heating system of any one of the above. The method includes: obtaining underground medium-deep rock and soil heat The current temperature of the heat exchange medium delivered by the exchange system;

Judging whether the current temperature is less than a preset temperature to obtain a judgment result;

According to the determination result, the heat exchange medium is controlled to be transferred to the heat circulation system of the heating terminal through a heat exchange temperature raising pumping device or a direct supply device.

Further, the step of controlling the transfer of the heat exchange medium to the heat circulation system of the heating terminal through a heat exchange temperature raising pumping device or a direct supply device according to the determination result includes:

When the current temperature is less than the preset temperature, the heat exchange medium is delivered to the heat exchange and temperature raising pumping device to raise the temperature of the heat exchange medium through the heat exchange and temperature raising pumping device After that, the heat exchange medium is transported to the heat-supply terminal thermal cycle system;

When the current temperature is greater than or equal to the preset temperature, the heat exchange medium is delivered to the direct supply device, so that the heat exchange medium is delivered to the heat supply terminal through the direct supply device. Circulatory system.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. With the above technical solutions, a medium-deep underground rock heating heating system and heating method of the present invention can achieve considerable technological advancement and practicability, and has a wide range of industrial use value. It has at least the following advantages:

(1) The medium-deep underground rock heat resources with huge reserves and stable heat sources are used for heating, which solves the problem of air pollution caused by burning coal for heating.

(2) In the heat exchange process, groundwater resources are not extracted, which prevents the pollution of groundwater resources.

(3) Through the setting of the heat exchange temperature raising pumping device, when the temperature of the heat exchange medium cannot reach the required temperature, the heat exchange medium can be effectively raised, thereby ensuring the heating effect at the heating end.

(4) By filling the high-efficiency heat transfer medium between the deep underground rock and soil and the high-efficiency heat exchanger, the heat exchange efficiency is effectively improved.

(5) By adding an insulation layer on the upper part of the outer casing, the heat energy loss caused by the heat exchange medium flowing through the ground surface is effectively avoided.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented in accordance with the content of the specification, and in order to make the above and other objectives, features and advantages of the present invention more obvious and understandable. , The following is a specific example of a preferred embodiment, in conjunction with the accompanying drawings, the detailed description is as follows.

Description of the drawings

Fig. 1 shows a schematic block diagram of a medium-deep underground rock heating heating system according to an embodiment of the present invention;

Fig. 2 shows a schematic flow diagram of a medium-deep underground rock heating type heating method according to an embodiment of the present invention.

【Explanation of main symbols】

1: Underground medium and deep rock-soil heat exchange system

10: Middle-deep rock and soil

11: Double casing

111: Outer casing

112: inner casing

12: High-efficiency heat exchange terminal

121: High-strength alloy casing

122: High efficiency heat exchanger

123: Efficient heat transfer medium

13: Insulation layer

2: Above-ground thermal auxiliary system

21: Heat exchange and temperature raising pumping device

211: Evaporator

212: Compressor

213: Condenser

22: Direct supply device

3: Heat circulation system at the end of heating

31: Heating pipe network

32: End cooling equipment

4: Control system

41: The first temperature control device

42: The first vacant valve

43: The second control valve

44: The third control valve

45: Second temperature control device

5: The first three-way pipe

6: The second three-way pipe

51, 61: first end

52, 62: second end

53, 63: third end

7: The first connecting pipe

8: The second connecting pipe

9: Pipeline pump

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, in conjunction with the accompanying drawings and preferred embodiments, a medium-deep underground rock heating type heating system and heating method proposed in accordance with the present invention will be described below. The specific embodiments and their effects are described in detail later.

The embodiment of the present invention provides a medium-deep underground rock heating heating system, as shown in FIG. 1, including: at least one underground medium-deep rock-soil heat exchange system 1, an above-ground heat auxiliary system 2, a heating terminal heat circulation system 3 and control system 4.

Among them, the underground middle-deep rock-soil heat exchange system 1 can be one (as shown in Figure 1). According to the actual needs of the heating terminal thermal cycle system 3, it can also be multiple underground middle-deep rock-soil heat exchange systems 1 in series and parallel. It is connected to the ground thermal auxiliary system 2 to ensure that it can provide sufficient heat energy.

In order to obtain the heat energy of the underground medium and deep layer of rock and soil 10, it is necessary to drill a drill from the surface to the medium and deep layer of rock and soil 10 by a drilling rig, and the underground medium and deep layer of rock and soil heat exchange system 1 is installed in the well. Specifically, according to the local geological conditions and the demand for heat energy, the well diameter is 150-300 mm, and the well depth is 600-3000 meters.

In an embodiment, the underground middle-deep rock-soil heat exchange system 1 may include a double-layer casing 11 and a high-efficiency heat exchange terminal 12, wherein the high-efficiency heat exchange terminal 12 is connected to the outer casing 111 of the double-layer casing 11 The heat exchange medium is injected into the upper end of the inner sleeve 112, flows through the lower end of the inner sleeve 112, and exchanges heat with the underground medium and deep soil 10 through the high-efficiency heat exchange terminal 12 to complete the heat exchange. Lead out through the outer sleeve 111.

In one embodiment, the high-efficiency heat exchange terminal 12 includes a high-strength alloy sleeve 121, a high-efficiency heat exchanger 122, and a high-efficiency heat transfer medium 123 that are coupled together. The high-strength alloy sleeve 121 can effectively protect the high-efficiency heat exchanger 122 from being damaged, so as to ensure the stability of the underground mid-deep rock-soil heat exchange system 1. The high-efficiency heat exchanger 122 is made of high-strength nickel steel alloy material, which can effectively improve the heat exchange efficiency of the high-efficiency heat exchange terminal 12 while ensuring its mechanical strength. Of course, the high-efficiency heat exchanger 122 can also be made of other materials, which is not limited here. In order to further improve the heat exchange efficiency, the gap between the deep underground rock and soil 10 and the high-strength alloy casing 121 and the high-efficiency heat exchanger 122 is filled with a high-efficiency heat transfer medium 123. The high-efficiency heat transfer medium 123 is mixed and stirred by cement, coagulant, fluid loss agent, dispersant, granulated blast furnace slag and other materials, and is densely filled in the high-strength alloy casing 121, In the gap between the high-efficiency heat exchange terminal 12 and the medium-deep rock soil 10.

Furthermore, in order to prevent the heat exchange medium that has undergone heat exchange from flowing through the upper part of the outer sleeve 111, the heat energy of the heat exchange medium is quickly lost due to the soil, gravel, water layer, etc. on the ground surface, and the upper part of the outer sleeve 111 is installed There is a thermal insulation layer 13. In order to effectively achieve the thermal insulation effect, the thermal insulation layer 13 can be sprayed nano thermal insulation materials, polyurethane foam thermal insulation pipes, and the outer layer is poured into polymer thermal insulation mortar.

In a specific embodiment, the heat exchange medium may be water, of course, it may also be other materials with faster heat transfer.

In one embodiment, the above-ground heat auxiliary system 2 includes a heat exchange and temperature raising pumping device 21 that raises the temperature of the heat exchange medium after the heat exchange through the underground middle-deep rock-soil heat exchange system 1, and performs heat exchange. The latter heat exchange medium is directly transported to the direct supply device 22 of the heat circulation system 3 of the heating terminal. Through the heat exchange and temperature raising pumping device 21 and the direct supply device 22, the heat exchange system 1 of the underground middle-deep rock soil 10 and the heat supply terminal heat circulation system 3 are organically connected.

Specifically, the first end 51 of the first three-way pipe 5 is connected to the upper end of the outer sleeve 111, the second end 52 is connected to one end of the heat exchange and temperature raising pumping device 21, and the third end 53 is connected to the heating end. Thermal circulation system 3; the first end 61 of the second three-way pipe 6 is connected to the upper end of the inner sleeve 112, the second end 62 is connected to one end of the heat exchange and temperature raising pumping device 21, and the third end 63 is connected to the supply Hot end thermal cycle system 3. At the same time, both ends of the first connecting pipe 7 are respectively connected to the other end of the heat exchange and temperature raising pumping device 21 and the third end 53 of the first three-way pipe 5, and the second connecting pipe 8 is respectively connected to the heat exchange and temperature raising pumping device. The other end of the device 21 is connected to the third end 63 of the second tee 6.

It can be seen from this that when the heat exchange medium is water, the first three-way pipe 5 and the first connecting pipe 7 are hot water pipes, and the second three-way pipe 6 and the second connecting pipe 8 are cold water pipes.

In one embodiment, the third end 53 of the first three-way pipe 5 and the third end 63 of the second three-way pipe 6 form a direct supply system 22.

In order to be able to realize the conversion between the heat exchange and temperature raising pumping device 21 and the direct supply device 22, as shown in FIG. 1, the control system 4 includes a first temperature control disposed at the second end 52 of the first three-way pipe 5. Device 41, a second temperature control device 45 provided on the second connecting pipe 8, a first control valve 42 provided on the third end 53 of the first three-way pipe 5, and a second end provided on the second three-way pipe 6 The second control valve 43 of 62 and the third control valve 44 provided at the third end 63 of the second three-way pipe 6.

In an embodiment, when the first temperature control device 41 detects that the temperature of the heat exchange medium (for example, hot water) conveyed by the outer sleeve 111 is lower than the first preset temperature (ie, lower than the required temperature), Then the first control valve 42 and the third control valve 44 are controlled to close, the second control valve 43 is opened, and the heat exchange medium is transported to the heat exchange and temperature raising pumping device 21 through the second end 52 of the first three-way pipe 5, The temperature of the heat exchange medium that has not reached the temperature requirement is raised, and the raised heat exchange medium is transported to the heating terminal heat circulation system 3 through the first connecting pipe 7 and the third end 53 of the first three-way pipe 5 . At the same time, the heat exchange medium (for example, cold water) that has undergone heat exchange through the heat supply terminal heat circulation system 3 is delivered to the heat exchange and temperature raising pumping device through the third end 62 of the second three-way pipe 6 and the second connecting pipe 8 21, the second end 62 and the first end 61 of the second three-way pipe 6 are then transported to the inner sleeve 112 to realize the circulation of the heat exchange medium.

When the second temperature control device 45 detects that the temperature of the heat exchange medium (for example, cold water) in the second connecting pipe 8 is lower than the second preset temperature, it indicates that the heating end thermal cycle system 3 has a greater demand for heat energy. The heat exchange medium at the current temperature cannot meet its demand, control the operation of the heat exchange temperature raising pumping device 21 to increase the temperature of the heat exchange medium; when the second temperature control device 45 detects the heat exchange medium in the second connecting pipe 8 When the temperature of (for example, cold water) is greater than or equal to the second preset temperature, it indicates that the heating end thermal circulation system 3 has a small demand for heat energy, and the heat exchange and temperature raising pumping device 21 is controlled to shut down to operate at the end of the heating end. When the thermal cycle system 3 has a small demand for thermal energy, the loss of the heat exchange and temperature raising pumping device 21 can be reduced, thereby achieving the purpose of saving energy.

In a specific embodiment, the heat exchange temperature raising pumping device 21 includes an evaporator 211, a compressor 212, and a condenser 213. Specifically, the heat exchange medium enters the evaporator through the second end 52 of the first three-way pipe 5 211. After the compressor 212 is compressed to increase the temperature, the heat exchange medium is raised through the condenser 213 to meet the requirements of the heat circulation system 3 at the heating terminal.

In another embodiment, when the first temperature control device 41 detects that the temperature of the heat exchange medium (for example, hot water) conveyed by the outer sleeve 111 is greater than or equal to the first preset temperature (ie, meets the required temperature) , The first control valve 42 and the third control valve 44 are controlled to open, and the second control valve 43 is closed, so as to directly transport the heat exchange medium conveyed by the outer sleeve 111 through the third end 53 of the first three-way pipe 5 To the heat circulation system 3 at the heating end. At the same time, the heat exchange medium (for example, cold water) that has undergone heat exchange through the heating terminal heat circulation system 3 is transported to the inner layer through the third end 63 of the second three-way pipe 6 and the first end 61 of the second three-way pipe 6 The sleeve 112 is used to realize the circulation of the heat exchange medium.

In a specific embodiment, the first temperature control device 41 and the second temperature control device 45 may be PLC temperature controllers, so as to realize the control of the control valve and the heat exchange temperature raising pumping device 21 according to the difference in temperature.

In an embodiment, the heating terminal thermal cycle system 3 includes a heating pipe network 31 and a terminal heat dissipation device 32. The terminal heat dissipation device 32 may be an indoor radiator, a floor heating tube plate, or a fan tube plate.

In order to enable the heat exchange medium to be transported quickly to meet the thermal energy demand of the heat circulation system 3 at the heating end, the first end 51 of the first three-way pipe 5, the first end 61 of the second three-way pipe 6 and the first The third end 53 of the three-way pipe 5 is provided with a pipeline pump 9 to ensure the kinetic energy of the heat exchange medium to circulate. Of course, according to actual requirements, such as transmission distance and other factors, multiple pipeline pumps 9 can also be provided, which is not limited to this.

The embodiment of the present invention also provides a medium-deep underground rock heating type heating method, which is used in any one of the above-mentioned medium-deep underground rock heating heating systems, as shown in FIG. 2, the heating method include:

Step S10, acquiring the current temperature of the heat exchange medium transported by the underground middle-deep rock-soil heat exchange system.

Specifically, due to factors such as geographical environment, heating demand, etc., the temperature requirements of the heat exchange medium in the heat circulation systems at the heating end are different. Therefore, when the heat exchange medium passes through the underground middle-deep rock-soil heat exchange system and the underground After the deep rock and soil undergoes heat exchange, the current temperature of the heat exchange medium needs to be detected, and the corresponding above-ground heat auxiliary system has been selected according to different current temperatures.

In step S20, it is judged whether the current temperature is less than a preset temperature, so as to obtain a judgment result.

Specifically, when the current temperature of the heat exchange medium is obtained, the current temperature needs to be compared with the preset temperature (ie, the first preset temperature), and different above-ground heat assist systems have been controlled to deliver according to different comparison results. The heat exchange medium is transferred to the heat circulation system at the heating end. Among them, the preset temperature is the temperature of the heat exchange medium required by the heating terminal thermal cycle system. Different heating terminal thermal cycle systems have different temperature requirements for the heat exchange medium. Therefore, the preset temperature can be carried out according to actual needs. set up.

In step S30, according to the determination result, the heat exchange medium is controlled to be transferred to the heat circulation system of the heating terminal through the heat exchange temperature raising pumping device or the direct supply device.

Specifically, when the current temperature of the heat exchange medium is less than the aforementioned preset temperature, it indicates that the temperature of the heat exchange medium has not reached the temperature required by the heat circulation system at the heating end, and therefore the temperature of the heat exchange medium needs to be raised. Furthermore, the heat exchange medium needs to be transported to the heat exchange and temperature raising pumping device, so that the heat exchange medium is raised by the heat exchange and temperature raising pumping device, and then sent to the heat circulation system at the heating end.

The specific temperature raising method is described in detail above, and will not be repeated here.

When the current temperature of the heat exchange medium is greater than or equal to the preset temperature, it indicates that the temperature of the heat exchange medium meets the temperature required by the heat circulation system at the heating end, so it is only necessary to transport the heat exchange medium to the heating end through the direct supply device The thermal cycle system is sufficient.

The switching method between the heat exchange and temperature raising pumping device and the direct supply system is described in detail above, and will not be repeated here.

The medium-deep underground rock heating heating system and heating method of the above-mentioned embodiments use the underground medium-deep rock-soil heat exchange system to directly exchange heat with the medium-deep rock and soil, without extracting groundwater, and has no impact on the environment. Interference, and the heat source continues to be stable, the investment is economical, the use environment is small, and it is easy to promote. Through the arrangement of the heat exchange temperature raising pumping device and the direct supply device, the heat exchange medium can still be raised by the heat exchange temperature raising pumping device to ensure the heat at the end of the heat supply when the heat in the middle and deep rock soil is insufficient. The circulation system requires heat energy. When the middle and deep layers of rock and soil have sufficient heat, the heat exchange medium can be directly transported to the heating end heat circulation system through the direct supply system. There is no need to raise the temperature of the heat exchange medium, which saves energy. Consumption.

The above are only the preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed in the preferred embodiments as above, it is not intended to limit the present invention. Anyone familiar with the profession Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make slight changes or modifications to equivalent embodiments with equivalent changes, but any content that does not depart from the technical solution of the present invention is based on the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

Claims (10)

1. A mid-deep underground rock heating type heating system, which is characterized by comprising: at least one underground mid-deep underground rock-soil heat exchange system, an above-ground heat auxiliary system, a heating terminal heat circulation system and a control system;

   Wherein, the underground middle-deep rock-soil heat exchange system is used for heat exchange between the heat exchange medium and the underground middle-deep rock and soil;

   The above-ground thermal auxiliary system is connected to the underground mid-deep rock-soil heat exchange system, which includes:

   The heat exchange temperature raising pumping device is used to raise the temperature of the heat exchange medium when the temperature of the heat exchange medium after the heat exchange is lower than the first preset temperature, and to increase the temperature of the heat exchange medium. The heat exchange medium is transported to the heat circulation system of the heating terminal; and

   A direct supply device, configured to transport the heat exchange medium to the heat supply terminal heat circulation system when the temperature of the heat exchange medium after the heat exchange is greater than or equal to the first preset temperature;

   The heat supply terminal heat circulation system is connected to the above-ground thermal auxiliary system to exchange heat with the heat exchange medium delivered by the above-ground thermal auxiliary system;

   The control system is used for controlling the above-ground thermal auxiliary system according to the magnitude relationship between the temperature of the heat exchange medium and the first preset temperature.
2. The mid-deep underground rock heating heating system according to claim 1, wherein the underground mid-deep underground rock-soil heat exchange system comprises: double-layer casing and high-efficiency heat exchange terminals;

   Wherein, the double-layer sleeve includes an inner sleeve and an outer sleeve, the lower end of the outer sleeve is connected to the high-efficiency heat exchange terminal, and the heat exchange medium is injected by the inner sleeve, After the high-efficiency heat exchange terminal exchanges heat with the underground middle and deep rock and soil, it is transported to the above-ground thermal auxiliary system by the outer casing.
3. The mid-deep underground rock heating type heating system according to claim 2, wherein the high-efficiency heat exchange terminal comprises: a high-strength alloy sleeve, a high-efficiency heat exchanger and a high-efficiency heat transfer medium;

   Wherein, the high-strength alloy sleeve is connected to the high-efficiency heat exchanger, and the high-efficiency heat transfer medium is filled between the high-strength alloy sleeve and the high-efficiency heat exchanger and the underground medium and deep rock soil To increase the heat exchange efficiency between the deep underground rock and soil and the heat exchange medium.
4. The mid-deep underground rock heating type heating system according to claim 2, characterized in that an insulation layer is further provided on the outer side of the upper part of the outer casing to prevent the heat exchange medium from passing through the outer casing The rapid loss of heat energy as the tube flows across the ground.
5. The mid-deep underground rock heating type heating system according to claim 2, further comprising a first three-way pipe, the first end of which is connected to the upper end of the outer casing, and the second end is connected to One end of the heat exchange and temperature raising pumping device and the third end are connected to the end thermal circulation system; and

   A second three-way pipe, the first end of which is connected to the upper end of the inner sleeve, the second end of which is connected to the one end of the heat exchange and temperature raising pumping device, and the third end of which is connected to the end thermal circulation system ；

   The other end of the heat exchange and temperature raising pumping device is connected to the third end of the first tee through a first connecting pipe, and the other end is connected to the second tee through a second connecting pipe The third end of the tube.
6. The mid-deep underground rock heating type heating system according to claim 5, wherein the control system comprises a first temperature control device, a first control valve, a second control valve, a third control valve, and a second control valve. Temperature control device;

   Wherein, the first temperature control device is arranged at the first end of the first three-way pipe, the first control valve is arranged at the third end of the first three-way pipe, and the second control valve is arranged at the third end of the first three-way pipe. The valve is arranged at the second end of the second three-way pipe, the third control valve is arranged at the third end of the second three-way pipe, and the second temperature control device is arranged at the second connecting pipe ；

   The second temperature control device controls the operation of the heat exchange temperature raising pumping device according to the temperature of the heat exchange medium in the second connecting pipe and a second preset temperature.
7. The medium-deep underground rock heating type heating system according to claim 5, wherein the first end of the first three-way pipe, the first end of the second three-way pipe, and the first A pipeline pump is provided at the third end of the three-way pipe to provide kinetic energy for the transportation of the heat exchange medium.
8. The medium-deep underground rock heating heating system according to claim 1, characterized in that:

   The heat exchange and temperature raising pumping device includes an evaporator, a compressor and a condenser.
9. A medium-deep underground rock-heated heating method, characterized in that it is used in the medium-deep underground rock-heated heating system according to claim 1, and the method comprises:

   Obtain the current temperature of the heat exchange medium delivered by the underground mid-deep rock-soil heat exchange system;

   Judging whether the current temperature is less than a preset temperature to obtain a judgment result;

   According to the determination result, the heat exchange medium is controlled to be transferred to the heat circulation system of the heating terminal through a heat exchange temperature raising pumping device or a direct supply device.
10. The medium-deep underground rock heating type heating method according to claim 9, characterized in that, according to the determination result, the heat exchange medium is controlled to be transmitted to the heat supply device through a heat exchange temperature raising pumping device or a direct supply device. The steps of the hot end thermal cycle system include:

    When the current temperature is less than the preset temperature, the heat exchange medium is delivered to the heat exchange and temperature raising pumping device to raise the temperature of the heat exchange medium through the heat exchange and temperature raising pumping device After that, the heat exchange medium is transported to the heat-supply terminal thermal cycle system;

    When the current temperature is greater than or equal to the preset temperature, the heat exchange medium is delivered to the direct supply device, so that the heat exchange medium is delivered to the heat supply terminal through the direct supply device. Circulatory system.

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