Geothermal energy hot water supply system

Abstract

The invention discloses a geothermal energy hot water supply system, and relates to the technical field of tunnel geothermal energy utilization, the geothermal energy hot water supply system comprises a tunnel phase change energy storage concrete lining and a plurality of shower room bodies, the inner wall of the tunnel phase change energy storage concrete lining is provided with a plurality of accommodating bent grooves, and the inner side of each accommodating bent groove is provided with a first heat exchange pipe; the first heat exchange pipe is connected with a second heat exchange pipe, the end, away from the first heat exchange pipe, of the second heat exchange pipe is connected with a cold water source, the first heat exchange pipe is communicated with the water inlet end of a water storage tank through a heat conduction pipeline, and the water outlet end of the water storage tank is communicated with the shower room body. The water outlet end of the water storage tank is further connected with a drinking water pipe. High-temperature terrestrial heat of the high-temperature section in the tunnel can be transferred to the water storage tank through the second heat exchange pipe and the first heat exchange pipe, so that hot water for bathing or drinking is provided for alpine regions in time, and meanwhile, the terrestrial heat is reasonably utilized.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel geothermal energy utilization, in particular to a geothermal energy hot water supply system. Background Art

[0002] Tunnels are engineering structures buried in the ground. They are a form of human use of underground space. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, mining tunnels and military tunnels. Energy underground structures refer to heat exchange pipes embedded in concrete structures. Circulating heat exchange media circulates in the pipes. Heat exchange is carried out with the help of the temperature difference between the heat exchange pipes and the surrounding concrete and rock and soil. Generally, they can be used to extract clean and sustainable geothermal energy.

[0003] Deep mountain high-temperature tunnels are now widely distributed, especially in areas rich in geothermal energy such as Tibet. For example, the surrounding rock temperature of the Sangzhuling Tunnel on the Sichuan-Tibet Railway is as high as 90°C, and the surrounding rock temperature of the Layue Tunnel is also 80°C-90°C. High-temperature tunnels are usually long and deeply buried. While high-temperature surrounding rocks bring heat damage to tunnels, they are also an important source of geothermal energy.

[0004] Tibet is located in a high-altitude and cold area with a harsh external environment and low temperature. Local residents generally use electricity to obtain hot water, which is costly and has low energy conversion efficiency. In addition, freight drivers driving trucks on plateau roads such as the Sichuan-Tibet Highway also need hot water for bathing or drinking for long periods of time. Plateau areas are sparsely populated and electricity supply is difficult. The cost of supplying electric hot water along the highway is high. Drivers cannot conveniently and easily take a bath and clean themselves on plateau roads, which affects their health and also causes inconvenience in drinking hot water.

[0005] Therefore, there is an urgent need to design a geothermal hot water supply system that can continuously supply hot water to solve such defects. Summary of the invention

[0006] The purpose of the present invention is to provide a geothermal hot water supply system to solve the problems existing in the above-mentioned prior art, which can absorb the geothermal heat in the tunnel and heat it into cold water so that the heated hot water can be used for showering and drinking.

[0007] To achieve the above object, the present invention provides the following solutions: The present invention discloses a geothermal hot water supply system, comprising a tunnel phase change energy storage concrete lining and a plurality of shower room bodies, wherein the inner wall of the tunnel phase change energy storage concrete lining is provided with a plurality of accommodating curved grooves, wherein a first heat exchange tube is provided on the inner side of each of the accommodating curved grooves, wherein the first heat exchange tube is connected with a second heat exchange tube, wherein one end of the second heat exchange tube away from the first heat exchange tube is connected with a cold water source, wherein the first heat exchange tube is connected with a water inlet end of a water storage tank through a heat conduction pipe, wherein a water outlet end of the water storage tank is connected with the shower room body, and a drinking water pipe is also connected with the water outlet end of the water storage tank.

[0008] Preferably, the first heat exchange tube is an arc-shaped tube, and two second heat exchange tubes are provided, and both ends of each first heat exchange tube are respectively connected to two second heat exchange tubes.

[0009] Preferably, a water inlet pump is provided on the second heat exchange tube.

[0010] Preferably, the water outlet end of the water storage tank is connected to a water purifier.

[0011] Preferably, the water outlet of the water purifier is connected to a first insulation pipe, the first insulation pipe is connected to a plurality of second insulation pipes, the number of the second insulation pipes is the same as the number of the shower room bodies, and each of the second insulation pipes extends into one of the shower room bodies.

[0012] Preferably, it also includes a third insulation pipe, the water inlet end of the third insulation pipe is connected to a cold water source, the third insulation pipe is also connected to a plurality of fourth insulation pipes, the number of the fourth insulation pipes is the same as the number of the shower room bodies, and each of the fourth insulation pipes extends into one of the shower room bodies.

[0013] Preferably, each shower room body is provided with a hot and cold water valve, the hot water interface of the hot and cold water valve is connected to the second insulation pipe, and the cold water interface of the hot and cold water valve is connected to the fourth insulation pipe.

[0014] Preferably, the water storage tank is also connected to a water outlet pipe.

[0015] Preferably, the receiving curved groove is filled with a thermally conductive filler, and the thermally conductive filler includes aluminum nitride, silicon carbide, magnesium oxide and steel fiber, and the weight ratio of the aluminum nitride, the silicon carbide, the magnesium oxide and the steel fiber is 6:2:1:1.

[0016] Preferably, the manufacturing material of the tunnel phase change energy storage concrete lining includes concrete, the concrete is mixed with a phase change material, the phase change material is paraffin, and the paraffin is encapsulated by steel balls.

[0017] Compared with the prior art, the present invention has achieved the following technical effects: The present invention installs a water tank on the top of the phase change energy storage concrete lining of the tunnel, a water pump is arranged inside the water tank, and a heat conduction pipe is connected to the middle position of the first heat exchange tube, so that the heat conduction pipe extends to the inside of the water tank, and the external cold water is transported into the second heat exchange tube and the first heat exchange tube through the water inlet pump. The second heat exchange tube and the first heat exchange tube can transfer the geothermal energy of the surrounding rock of the high-temperature tunnel to the circulating water in the second heat exchange tube and the first heat exchange tube, and then transport the heated water to the inside of the water tank, so as to provide hot water in the water tank, provide hot water to the passengers in time, and also make reasonable use of geothermal energy. Since geothermal energy is clean and sustainable, the system can better meet the current energy conservation and emission reduction policies.

[0018] Furthermore, the present invention installs hot and cold water valves inside the shower room body and connects one end of the fourth insulation pipe and the second insulation pipe to the valves, thereby ensuring that the water temperature can be adjusted when using hot water, thereby avoiding scalding the user due to high water temperature. The water purifier can provide clean water, and the control valve inside the water purifier can control the operation and shutdown of the hot water supply system, effectively improving the overall practical flexibility and functionality.

[0019] Furthermore, the latent heat of phase change refers to the heat released or absorbed by a substance during the phase change process. Thermally conductive phase change materials achieve temperature regulation by absorbing or releasing considerable heat. Due to the large latent heat of phase change, thermally conductive phase change materials can absorb or release a large amount of thermal energy in a short period of time, which facilitates efficient thermal management. Compared with traditional concrete, concrete mixed with phase change materials has a large energy storage capacity. The circulating water in the first heat exchange tube and the second heat exchange tube can first absorb the energy inside the phase change concrete. After the energy absorption of the latent heat of phase change is completed, the geothermal energy in the surrounding rock is absorbed, which improves the functionality of the energy tunnel heat exchange system, and is particularly suitable for applications in areas with distinct cold and hot seasons throughout the year.

[0020] Furthermore, the tunnel phase change energy storage concrete lining belongs to a large volume of concrete. The use of the first heat exchange tube and the second heat exchange tube to absorb or release heat in the tunnel phase change energy storage concrete lining may cause local high temperature stress. The phase change material has good temperature stability and can achieve constant temperature regulation within a certain range. Since a large amount of heat needs to be absorbed or released during the phase change process, the temperature of the phase change material remains unchanged for a long time. Therefore, thermal conductive phase change materials are particularly suitable for structures that require stable heat dissipation and temperature control. After the phase change material is added to the concrete, the temperature of the large volume of concrete can be adjusted, the local temperature difference can be reduced, and then the temperature stress and deformation can be reduced, thereby improving the safety and durability of the buried pipe concrete structure during use.

[0021] Furthermore, the receiving curved groove can use a special template before the concrete pouring process, and after pouring, a groove is formed according to the shape of the template. The receiving curved groove is used to place the first heat exchange tube and fill the thermal conductive filler. The thermal conductive filler is packaged with a geotextile bag. The geotextile bag can be in various forms and can be produced in advance. The construction operation is simple, there is no additional construction space for pipeline layout, the project has strong applicability, and it is easy to promote the project.

[0022] Furthermore, the heat-conducting filler is packaged in a geotextile bag and filled in the receiving curved groove to improve the heat exchange efficiency between the first heat exchange tube and the surrounding rock and soil. In addition, the filling bag can also play a role in sealing and protecting the first heat exchange tube, reducing the aging and loss rate of the pipeline. When the first heat exchange tube needs to be replaced due to aging, the bag can be taken out to replace the first heat exchange tube, which is convenient for maintenance.

[0023] Furthermore, the specifications of the first heat exchange tube and the second heat exchange tube can be varied. According to the requirements, they can be arranged along the full width of the tunnel or half the width. They can also be composed of two systems and used alternately.

[0024] Furthermore, two second heat exchange tubes are connected in parallel, and a special water outlet is also set up, which can flexibly adjust the flow rate of the heat exchange fluid and the use of each sub-circulation according to the heat demand of the user end, and the system has good controllability. Only the water inlet pump is needed to drive the circulating water flow, with high energy utilization and low operating power consumption cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the structure of a geothermal hot water supply system according to an embodiment of the present invention; Figure 2 for Figure 1 A in the enlarged view; Figure 3 It is a structural schematic diagram of the first heat exchange tube, the second heat exchange tube and the heat transfer pipe structure in the geothermal hot water supply system according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of a shower room body in a geothermal hot water supply system according to an embodiment of the present invention; Figure 5 It is a structural schematic diagram of the middle high-temperature section of the geothermal hot water supply system according to an embodiment of the present invention; Figure 6 It is a partial enlarged view of the first heat exchange tube and the receiving bent groove in the geothermal hot water supply system according to an embodiment of the present invention; In the figure: 1-tunnel phase change energy storage concrete lining; 2-first heat exchange tube; 3-second heat exchange tube; 4-water storage tank; 5-heat conduction pipe; 6-shower room body; 7-first insulation pipe; 8-second insulation pipe; 9-third insulation pipe; 10-fourth insulation pipe; 11-hot and cold water valves; 12-water purifier; 13-drinking water pipe; 14-accommodating curved groove; 15-outlet pipe; 16-inlet pump; 17-thermal conductive filler. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide a geothermal hot water supply system to solve the problems existing in the above-mentioned prior art, which can absorb the geothermal heat in the tunnel and heat it into cold water so that the heated hot water can be used for showering and drinking.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1-Figure 6 As shown, this embodiment provides a geothermal hot water supply system, including a tunnel phase change energy storage concrete lining 1 and a plurality of shower room bodies 6. The number of shower room bodies 6 can be set according to actual needs, and the specific number is not limited here. The inner wall of the tunnel phase change energy storage concrete lining 1 is provided with a plurality of receiving curved grooves 14, and the receiving curved grooves 14 are arc-shaped groove structures. The inner side of each receiving curved groove 14 is fixed with a corresponding first heat exchange tube 2 by a U-shaped card or a steel frame. The first heat exchange tube 2 is connected to the second heat exchange tube 3, and the end of the second heat exchange tube 3 away from the first heat exchange tube 2 is connected to a cold water source, and the cold water source includes but is not limited to a tap water source (i.e., a faucet, a water tank or other water supply pipeline, etc.). The first heat exchange tube 2 is connected to the water inlet end of the water storage tank 4 through the heat conduction pipe 5, so that the heated water is transported to the water storage tank 4 for temporary storage. A water pump is provided at the water outlet end of the water tank 4, and the water outlet end of the water tank 4 is connected to the shower room body 6 to provide water for showering; in addition, a drinking water pipe 13 is also connected to the water outlet end of the water tank 4, and the drinking water pipe 13 is fixed to the top of the tunnel phase change energy storage concrete lining 1 through parts such as fixing plates or clamps. The end of the drinking water pipe 13 away from the water tank 4 can be connected to a faucet or a water dispenser, so that drivers can get hot water conveniently.

[0031] In addition, electric control valves may be further provided on the first heat exchange tube 2, the second heat exchange tube 3 and the heat conduction pipeline to control the flow of each pipeline.

[0032] In actual use, the water from the cold water source flows into the first heat exchange tube 2 through the second heat exchange tube 3. The first heat exchange tube 2 can absorb the heat on the tunnel phase change energy storage concrete lining 1 and the heat in the surrounding rocks and transfer them to the cold water, so that the cold water heats up. Then the hot water in the first heat exchange tube 2 flows into the water storage tank 4 through the heat conduction pipe 5 for temporary storage. Finally, the water in the water storage tank 4 can be transported to the shower room body 6 or the drinking water pipe 13 according to actual needs for users to use.

[0033] In this embodiment, the first heat exchange tube 2 is an arc-shaped tube, which matches the shape of the receiving curved groove 14. Two second heat exchange tubes 3 are provided, and both ends of each first heat exchange tube 2 are respectively connected to two second heat exchange tubes 3. Figure 3 As shown, the two second heat exchange tubes 3 are respectively arranged at the bottom of both ends of each first heat exchange tube 2, and both ends of all the first heat exchange tubes 2 are respectively connected to the two first heat exchange tubes 2.

[0034] In this embodiment, a water inlet pump 16 is provided on the second heat exchange tube 3. The water inlet pump 16 can be used to provide power for the transportation of cold water.

[0035] In this embodiment, the water outlet end of the water storage tank 4 is connected to a water purifier 12. The water purifier 12 can be an existing water purification device. Its purpose is to filter and purify the water so that the hot water reaches the quality of showering and direct drinking, and then transported to the shower room body 6 and the drinking water pipe 13.

[0036] In this embodiment, the water outlet of the water purifier 12 is connected to a first insulation pipe 7 arranged horizontally. Figure 1 As shown, the first insulation pipe 7 extends to the upper end of each shower room body 6. The first insulation pipe 7 is connected to a plurality of vertically arranged second insulation pipes 8, the number of the second insulation pipes 8 is the same as the number of the shower room bodies 6, and each second insulation pipe 8 extends into a shower room body 6, thereby providing hot water for the shower room body 6.

[0037] In addition, an insulation layer may be provided on the outside of the heat-conducting pipe 5, the first insulation pipe 7 and the second insulation pipe 8 to insulate the hot water inside. The material of the insulation layer includes but is not limited to the existing asbestos material.

[0038] In this embodiment, a third insulation pipe 9 is also included, and the third insulation pipe 9 also extends to the upper end of each shower room body 6. The water inlet end of the third insulation pipe 9 is connected to a cold water source, and the water outlet end of the third insulation pipe 9 is also connected to a plurality of fourth insulation pipes 10, and the number of the fourth insulation pipes 10 is the same as that of the shower room body 6, and each fourth insulation pipe 10 extends into a shower room body 6, thereby providing cold water for the shower room body 6.

[0039] In this embodiment, if Figure 4 As shown, each shower room body 6 is provided with a hot and cold water valve 11, which is a prior art, so its structure is not described here. The hot water interface of the hot and cold water valve 11 is connected to the second insulation pipe 8, and the cold water interface of the hot and cold water valve 11 is connected to the fourth insulation pipe 10. By adjusting the switch of the hot and cold water valve 11, the water outlet temperature can be controlled, so that the hot and cold water valve 11 can flow out shower water with a suitable temperature for people to take a bath.

[0040] In this embodiment, the water storage tank 4 is also connected to a water outlet pipe 15, and a water outlet control valve may also be provided on the water outlet pipe 15, and the water outlet control valve is used to control the flow of the water outlet pipe 15. When the water temperature in the water storage tank 4 is too low, the cold water can be discharged through the water outlet pipe 15, and then the cold water is transported to the second heat exchange pipe 3 and the first heat exchange pipe 2 again through the water inlet pump 16 to increase the temperature, so that it becomes hot, and then transported to the water storage tank 4 again for storage.

[0041] Furthermore, in order to detect the water temperature inside the water tank 4, a temperature sensor may be provided in the water tank 4 to monitor the temperature of the water inside the water tank 4 in real time.

[0042] In addition, a controller may be provided, and the temperature sensor, water inlet pump 16, water storage pump and each electric control valve are electrically connected to the controller, so as to realize remote monitoring of the staff. The controller includes but is not limited to an existing PLC controller, a single chip controller or a computer.

[0043] In this embodiment, the receiving curved groove 14 is filled with a heat-conductive filler 17, and the heat-conductive filler 17 fills the gap between the receiving groove and the first heat exchange tube 2. The heat-conductive filler 17 can improve the thermal conductivity between the receiving groove (or the tunnel phase change energy storage concrete lining 1) and the first heat exchange tube 2.

[0044] The heat conductive filler 17 is packaged with a geotextile bag and filled in the receiving curved groove 14. In addition, the geotextile bag can also play a role in sealing and protecting the first heat exchange tube 2, reducing the aging and loss rate of the pipeline. In addition, when the first heat exchange tube 2 needs to be replaced due to aging, the first heat exchange tube 2 can be replaced by simply taking out the geotextile bag, which is convenient for maintenance.

[0045] The thermal conductive filler 17 includes aluminum nitride, silicon carbide, magnesium oxide and steel fiber, and the weight ratio of aluminum nitride, silicon carbide, magnesium oxide and steel fiber is 6:2:1:1. Those skilled in the art can also select other materials or adjust the weight percentage of each material according to the actual situation.

[0046] In this embodiment, the manufacturing material of the tunnel phase change energy storage concrete lining 1 includes concrete, and the difference from the existing concrete is that the phase change material is mixed into the concrete, and the phase change material is paraffin wax, and the paraffin wax is encapsulated by steel balls. Steel balls containing paraffin wax are added during the concrete mixing stage, and the steel balls replace the coarse aggregate in the concrete. The volume replacement rate between the steel balls and the coarse aggregate is set to 50%, that is, the steel balls replace 50% of the original coarse aggregate, and the volume ratio of the steel balls to the coarse aggregate in the tunnel phase change energy storage concrete lining 1 is 1:1.

[0047] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A geothermal hot water supply system, characterized in that: The invention comprises a tunnel phase-change energy storage concrete lining (1) and a plurality of shower room bodies (6); the inner wall of the tunnel phase-change energy storage concrete lining (1) is provided with a plurality of receiving curved grooves (14); a first heat exchange tube (2) is provided on the inner side of each receiving curved groove (14); the first heat exchange tube (2) is connected to a second heat exchange tube (3); an end of the second heat exchange tube (3) away from the first heat exchange tube (2) is connected to a cold water source; the first heat exchange tube (2) is connected to a water inlet end of a water storage tank (4) via a heat conduction pipe (5); the water outlet end of the water storage tank (4) is connected to the shower room body (6); and the water outlet end of the water storage tank (4) is also connected to a drinking water pipe (13).

2. The geothermal hot water supply system according to claim 1, characterized in that: The first heat exchange tube (2) is an arc-shaped tube, two second heat exchange tubes (3) are provided, and both ends of each first heat exchange tube (2) are respectively connected to two second heat exchange tubes (3).

3. The geothermal hot water supply system according to claim 1, characterized in that: A water inlet pump (16) is provided on the second heat exchange tube (3).

4. The geothermal hot water supply system according to claim 1, characterized in that: The water outlet end of the water storage tank (4) is connected to a water purifier (12).

5. The geothermal hot water supply system according to claim 4, characterized in that: The water outlet of the water purifier (12) is connected to a first insulation pipe (7), the first insulation pipe (7) is connected to a plurality of second insulation pipes (8), the number of the second insulation pipes (8) is the same as the number of the shower room bodies (6), and each of the second insulation pipes (8) extends into one of the shower room bodies (6).

6. The geothermal hot water supply system according to claim 5, characterized in that: It also comprises a third thermal insulation pipe (9), the water inlet end of the third thermal insulation pipe (9) being connected to a cold water source, the third thermal insulation pipe (9) being further connected to a plurality of fourth thermal insulation pipes (10), the number of the fourth thermal insulation pipes (10) being the same as the number of the shower room bodies (6), and each of the fourth thermal insulation pipes (10) extending into one of the shower room bodies (6).

7. The geothermal hot water supply system according to claim 6, characterized in that: Each shower room body (6) is provided with a hot and cold water valve (11), the hot water interface of the hot and cold water valve (11) is connected to the second thermal insulation pipe (8), and the cold water interface of the hot and cold water valve (11) is connected to the fourth thermal insulation pipe (10).

8. The geothermal hot water supply system according to claim 1, characterized in that: The water storage tank (4) is also connected to a water outlet pipe (15).

9. The geothermal hot water supply system according to claim 1, characterized in that: The receiving curved groove (14) is filled with a heat-conductive filler (17), wherein the heat-conductive filler (17) comprises aluminum nitride, silicon carbide, magnesium oxide and steel fiber, and the weight ratio of the aluminum nitride, the silicon carbide, the magnesium oxide and the steel fiber is 6:2:1:

1.

10. The geothermal hot water supply system according to claim 1, characterized in that: The tunnel phase change energy storage concrete lining (1) is made of materials including concrete, into which a phase change material is mixed, wherein the phase change material is paraffin wax, and the paraffin wax is encapsulated by steel balls.

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