U-shaped heat exchange device for medium-deep geothermal well

Abstract

The utility model discloses a U-shaped heat exchange device for a mid-deep geothermal well, which belongs to the technical field of mid-deep geothermal resource development and comprises a water inlet tank, a water inlet sleeve, a water outlet sleeve and a water outlet tank connected with a water outlet pump. The heat exchanger is characterized in that a first partition piece, a first confluence pipe fitting, a dish-shaped flow guide pipe fitting, a second partition piece and a second confluence pipe fitting are arranged in the U-shaped heat exchange pipe, a cavity of the U-shaped heat exchange pipe is filled with a high-temperature heat conduction material, the first confluence pipe fitting is fixed to the first partition piece, the water inlet sleeve is communicated with the dish-shaped flow guide pipe fitting through the first confluence pipe fitting, and the second confluence pipe fitting is fixed to the second partition piece. The second confluence pipe fitting is fixed on the second separator; and the water outlet sleeve is communicated with the dish-shaped flow guide pipe fitting through the second confluence pipe fitting. The confluence pipe fitting and the dish-shaped flow guide pipe fitting are arranged in the U-shaped heat exchange pipe, so that the retention time and the travel of a solution in a geothermal layer are prolonged, the contact area of the solution and a high-temperature heat conduction material is increased, and the heat conversion efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medium-deep geothermal resource development, in particular to a U-shaped heat exchange device for a medium-deep geothermal well. Background Art

[0002] Geothermal energy is a type of heat energy that originates from the Earth's interior and is stored in the Earth's crust in the form of underground rocks, soil, and water. It is renewable, low-carbon, environmentally friendly, abundant in resources, and sustainable. Geothermal energy is categorized according to its depth: shallow, medium-deep, and deep. Medium-deep geothermal energy generally has a depth of 200-3000m and a temperature of 50-150 degrees Celsius, providing a stable heat source and a moderate temperature. my country has abundant and widely distributed geothermal resources, with enormous potential for development and utilization. The eastern coastal areas, North China, and Northeast China are rich in medium- and low-temperature geothermal resources; the southwest region has abundant geothermal resources and relatively high geothermal temperatures; and the basins and fault zones in the northwest region also have relatively rich geothermal resources.

[0003] Currently, mid- to deep-layer geothermal heat exchange systems are primarily divided into coaxial tube-in-tube and U-tube types. Coaxial tube-in-tube geothermal heat exchangers have the disadvantages of low heat exchange efficiency, difficult maintenance, and high requirements for geological conditions. In contrast, mid- to deep-layer U-tube geothermal heat exchangers offer the advantages of a simpler structure, higher heat exchange efficiency, and greater adaptability.

[0004] Whether it's a U-tube geothermal heat exchanger or a coaxial tube-in-tube geothermal heat exchanger, the basic principle is to inject low-temperature water through a high-temperature section, exchange heat with the high-temperature rock and soil layers, and then discharge it, thereby achieving the purpose of geothermal heat exchange. However, direct injection and discharge make it difficult to achieve sufficient heat exchange. Without considering the underlying geothermal reserves, the heat exchange efficiency is low and the utilization rate of geothermal energy is insufficient. At the same time, during the process of high-temperature water flowing out after heat exchange, heat loss is also a significant factor affecting the reduction in heat exchange efficiency. In coaxial tube-in-tube geothermal heat exchangers, in particular, the low-temperature water and high-temperature water are transported coaxially, further reducing the heat content of the high-temperature water, increasing heat energy loss during transportation, and reducing geothermal energy utilization.

[0005] The Chinese patent document with publication number CN211625754U and publication date October 2, 2020 discloses a geothermal well heat exchange device, including a formation, a geothermal well single-open casing, a geothermal well double-open casing, a well cover, a water tank, a water pump and a U-shaped heat pipe. The geothermal well single-open casing is fixedly installed inside the formation, the top of the geothermal well double-open casing is coaxially connected to the bottom of the geothermal well single-open casing, the bottom of the well cover is connected to the top of the geothermal well single-open casing, the bottom of the water tank is connected to the top of the formation, the bottom of the water pump is connected to the bottom of the formation, the output end of the water tank is connected to the input end of the water pump, and the output end of the water pump is connected to the U-shaped heat pipe. The heat pipe input end is connected, and the middle section of the U-shaped heat pipe extends into the formation through the first open casing of the geothermal well and the second open casing of the geothermal well. It is characterized by: including a connecting pipe, a drain pipe, an oil tank, a second connecting pipe, an oil tank cover, a first oil pump and an oil pipe. The connecting pipe connects the output end of the U-shaped heat pipe and the drain pipe input end, the drain pipe is fixedly wound around the outer end of the water tank, the second connecting pipe connects the drain pipe output end and the oil tank input end, an oil filling port is provided at the top of the oil tank, the bottom end of the oil tank cover is rotatably connected to the top end of the oil tank cover, the first oil pump input end is connected to the oil tank output end, and the oil pipe connects the first oil pump output end and the U-shaped heat pipe input end.

[0006] The geothermal well heat exchange device disclosed in this patent document utilizes an oil filling port and oil tank cap to allow the heat-conducting silicone oil to be circulated and heated, reducing heat loss and alleviating usage limitations. However, the heat conversion efficiency is poor. Utility Model Content

[0007] In order to overcome the defects of the above-mentioned prior art, the present invention provides a U-shaped heat exchange device for medium-deep geothermal wells. The present invention increases the retention time and travel of the solution in the geothermal layer by arranging a confluence pipe and a disc-shaped flow guide pipe in the U-shaped heat exchange tube, increases the contact area with the high-temperature heat-conducting material, and greatly improves the heat conversion efficiency.

[0008] The utility model is achieved through the following technical solutions:

[0009] A U-shaped heat exchange device for a medium-deep geothermal well, comprising a water inlet box, a water inlet casing, a water outlet casing and a water outlet box connected to a water outlet pump, the water inlet casing being connected to the water inlet box, and the water outlet casing being connected to the water outlet box, characterized in that it also comprises a U-shaped heat exchange tube, wherein a first partition, a first manifold, a disc-shaped flow guide tube, a second partition and a second manifold are arranged in the U-shaped heat exchange tube, and the cavity of the U-shaped heat exchange tube is filled with a high-temperature heat-conductive material, the first manifold is fixed on the first partition, the water inlet casing is connected to the disc-shaped flow guide tube through the first manifold, the second manifold is fixed on the second partition, and the water outlet casing is connected to the disc-shaped flow guide tube through the second manifold.

[0010] The U-shaped heat exchange tube includes a first vertical heat exchange tube, a horizontal heat exchange tube and a second vertical heat exchange tube. One end of the horizontal heat exchange tube is connected to the first vertical heat exchange tube, and the other end of the horizontal heat exchange tube is connected to the second vertical heat exchange tube.

[0011] The first partition includes a first upper partition plate and a first lower partition plate. The first upper partition plate is fixedly connected to the upper end of the first vertical heat exchange tube, and the first lower partition plate is fixedly connected to the lower end of the first vertical heat exchange tube.

[0012] The first manifold member includes a first upper manifold and a first lower manifold. The first upper manifold is fixed on the first upper partition plate, and the first lower manifold is fixed on the first lower partition plate.

[0013] The second partition includes a second upper partition plate and a second lower partition plate. The second upper partition plate is fixedly connected to the upper end of the second vertical heat exchange tube, and the second lower partition plate is fixedly connected to the lower end of the second vertical heat exchange tube.

[0014] The second manifold member includes a second upper manifold and a second lower manifold. The second upper manifold is fixed on the second upper partition plate, and the second lower manifold is fixed on the second lower partition plate.

[0015] The high-temperature heat-conducting material is heat-conducting glue or silicon carbide.

[0016] The disc-shaped flow guide pipe assembly includes a first vertical disc-shaped flow guide pipe, a transverse disc-shaped flow guide pipe and a second vertical disc-shaped flow guide pipe. The upper end of the first vertical disc-shaped flow guide pipe is connected to the first upper manifold, the lower end of the first vertical disc-shaped flow guide pipe is connected to the first lower manifold, one end of the transverse disc-shaped flow guide pipe is connected to the first lower manifold, the other end of the transverse disc-shaped flow guide pipe is connected to the second lower manifold, the upper end of the second vertical disc-shaped flow guide pipe is connected to the second upper manifold, and the lower end of the second vertical disc-shaped flow guide pipe is connected to the second lower manifold.

[0017] The water inlet tank is equipped with a water inlet valve and a water inlet tank pressure balancing valve, and the water outlet tank is equipped with a water outlet valve and a water outlet tank pressure balancing valve.

[0018] The water outlet sleeve comprises an inner water outlet pipe and an outer water outlet pipe, and a heat insulation layer is provided between the inner water outlet pipe and the outer water outlet pipe.

[0019] The beneficial effects of the present invention are mainly manifested in the following aspects:

[0020] 1. The utility model comprises a U-shaped heat exchange tube provided with a first separator, a first manifold, a disc-shaped flow guide tube, a second separator and a second manifold. The cavity of the U-shaped heat exchange tube is filled with a high-temperature heat-conducting material. The first manifold is fixed to the first separator, and the water inlet sleeve is connected to the disc-shaped flow guide tube through the first manifold. The second manifold is fixed to the second separator, and the water outlet sleeve is connected to the disc-shaped flow guide tube through the second manifold. Compared with the prior art, by arranging the manifold and the disc-shaped flow guide tube in the U-shaped heat exchange tube, the retention time and travel of the solution in the geothermal layer are prolonged, the contact area with the high-temperature heat-conducting material is increased, and the heat conversion efficiency is greatly improved.

[0021] 2. In the present invention, the dish-shaped flow guide pipe is in the shape of a spiral dish, which makes the heat exchange of the solution more uniform and is conducive to improving the heat conversion efficiency.

[0022] 3. In the present invention, the cavity of the U-shaped heat exchange tube is filled with high-temperature heat-conducting material. The high-temperature heat-conducting material does not flow with the solution and is heated by the geothermal layer for a long time, further improving the utilization rate of geothermal energy.

[0023] 4. In the present invention, the dish-shaped flow guide pipe comprises a first vertical dish-shaped flow guide pipe, a horizontal dish-shaped flow guide pipe and a second vertical dish-shaped flow guide pipe. The upper end of the first vertical dish-shaped flow guide pipe is connected to the first upper manifold, the lower end of the first vertical dish-shaped flow guide pipe is connected to the first lower manifold, one end of the horizontal dish-shaped flow guide pipe is connected to the first lower manifold, the other end of the horizontal dish-shaped flow guide pipe is connected to the second lower manifold, the upper end of the second vertical dish-shaped flow guide pipe is connected to the second upper manifold, and the lower end of the second vertical dish-shaped flow guide pipe is connected to the second lower manifold. The dish-shaped flow guide pipe reduces the flow velocity of the solution in the geothermal layer, so that the solution has more sufficient time to exchange heat, thereby further improving the heat conversion efficiency.

[0024] 5. In the present invention, the outlet casing comprises an inner outlet pipe and an outer outlet pipe, and a heat insulation layer is provided between the inner outlet pipe and the outer outlet pipe, which reduces the heat energy loss during the solution transportation process and increases the utilization rate of geothermal energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, wherein:

[0026] Figure 1 It is a structural diagram of the utility model;

[0027] Figure 2 for Figure 1 A magnified cross-section at center A;

[0028] Figure 3 for Figure 1 Enlarged cross-section at point B;

[0029] Figure 4 It is a structural diagram of a U-shaped heat exchange tube;

[0030] Markings in the figure: 1, water inlet box, 2, water inlet casing, 3, water outlet casing, 4, water outlet box, 5, U-shaped heat exchange tube, 6, first partition, 7, first manifold, 8, disc-shaped guide pipe, 9, second partition, 10, second manifold, 11, high-temperature heat conductive material, 12, first vertical heat exchange tube, 13, horizontal heat exchange tube, 14, second vertical heat exchange tube, 15, first upper partition plate, 16, first lower partition plate, 17, first upper manifold , 18. First lower manifold, 19. Second upper partition plate, 20. Second lower partition plate, 21. Second upper manifold, 22. Second lower manifold, 23. First vertical disc-shaped guide pipe, 24. Horizontal disc-shaped guide pipe, 25. Second vertical disc-shaped guide pipe, 26. Water inlet valve, 27. Water inlet tank pressure balancing valve, 28. Water outlet valve, 29. Water outlet tank pressure balancing valve, 30. Water outlet inner pipe, 31. Water outlet outer pipe, 32. Thermal insulation layer. DETAILED DESCRIPTION

[0031] Example 1

[0032] See also Figure 1 A U-shaped heat exchange device for a medium-deep geothermal well includes a U-shaped heat exchange tube 5, a water inlet box 1, a water inlet casing 2, a water outlet casing 3 and a water outlet box 4 connected to a water outlet pump. The water inlet casing 2 is connected to the water inlet box 1, and the water outlet casing 3 is connected to the water outlet box 4. A first separator 6, a first manifold 7, a disc-shaped flow guide pipe 8, a second separator 9 and a second manifold 10 are provided in the U-shaped heat exchange tube 5. The cavity of the U-shaped heat exchange tube 5 is filled with high-temperature heat conductive material 11. The first manifold 7 is fixed on the first separator 6. The water inlet casing 2 is connected to the disc-shaped flow guide pipe 8 through the first manifold 7. The second manifold 10 is fixed on the second separator 9. The water outlet casing 3 is connected to the disc-shaped flow guide pipe 8 through the second manifold 10.

[0033] This embodiment is the most basic implementation method. A first separator 6, a first manifold 7, a disc-shaped flow guide pipe 8, a second separator 9 and a second manifold 10 are provided in the U-shaped heat exchange tube 5. The cavity of the U-shaped heat exchange tube 5 is filled with a high-temperature heat-conducting material 11. The first manifold 7 is fixed on the first separator 6. The water inlet sleeve 2 is connected to the disc-shaped flow guide pipe 8 through the first manifold 7. The second manifold 10 is fixed on the second separator 9. The water outlet sleeve 3 is connected to the disc-shaped flow guide pipe 8 through the second manifold 10. Compared with the prior art, by arranging the manifold and the disc-shaped flow guide pipe 8 in the U-shaped heat exchange tube 5, the residence time and travel of the solution in the geothermal layer are improved, the contact area with the high-temperature heat-conducting material 11 is increased, and the heat conversion efficiency is greatly improved.

[0034] Example 2

[0035] See also Figure 1 、 Figure 2 and Figure 4 A U-shaped heat exchange device for a medium-deep geothermal well includes a U-shaped heat exchange tube 5, a water inlet box 1, a water inlet casing 2, a water outlet casing 3 and a water outlet box 4 connected to a water outlet pump. The water inlet casing 2 is connected to the water inlet box 1, and the water outlet casing 3 is connected to the water outlet box 4. A first separator 6, a first manifold 7, a disc-shaped flow guide pipe 8, a second separator 9 and a second manifold 10 are provided in the U-shaped heat exchange tube 5. The cavity of the U-shaped heat exchange tube 5 is filled with high-temperature heat conductive material 11. The first manifold 7 is fixed on the first separator 6. The water inlet casing 2 is connected to the disc-shaped flow guide pipe 8 through the first manifold 7. The second manifold 10 is fixed on the second separator 9. The water outlet casing 3 is connected to the disc-shaped flow guide pipe 8 through the second manifold 10.

[0036] The U-shaped heat exchange tube 5 includes a first vertical heat exchange tube 12 , a horizontal heat exchange tube 13 and a second vertical heat exchange tube 14 . One end of the horizontal heat exchange tube 13 is connected to the first vertical heat exchange tube 12 , and the other end of the horizontal heat exchange tube 13 is connected to the second vertical heat exchange tube 14 .

[0037] The first partition 6 includes a first upper partition plate 15 and a first lower partition plate 16 . The first upper partition plate 15 is fixedly connected to the upper end of the first vertical heat exchange tube 12 , and the first lower partition plate 16 is fixedly connected to the lower end of the first vertical heat exchange tube 12 .

[0038] The first manifold member 7 includes a first upper manifold 17 and a first lower manifold 18 . The first upper manifold 17 is fixed to the first upper partition plate 15 , and the first lower manifold 18 is fixed to the first lower partition plate 16 .

[0039] This embodiment is a preferred implementation method. The dish-shaped flow guide pipe 8 is in the shape of a spiral dish, which makes the heat exchange of the solution more uniform and is conducive to improving the heat conversion efficiency.

[0040] Example 3

[0041] See also Figure 1-Figure 4A U-shaped heat exchange device for a medium-deep geothermal well includes a U-shaped heat exchange tube 5, a water inlet box 1, a water inlet casing 2, a water outlet casing 3 and a water outlet box 4 connected to a water outlet pump. The water inlet casing 2 is connected to the water inlet box 1, and the water outlet casing 3 is connected to the water outlet box 4. A first separator 6, a first manifold 7, a disc-shaped flow guide pipe 8, a second separator 9 and a second manifold 10 are provided in the U-shaped heat exchange tube 5. The cavity of the U-shaped heat exchange tube 5 is filled with high-temperature heat conductive material 11. The first manifold 7 is fixed on the first separator 6. The water inlet casing 2 is connected to the disc-shaped flow guide pipe 8 through the first manifold 7. The second manifold 10 is fixed on the second separator 9. The water outlet casing 3 is connected to the disc-shaped flow guide pipe 8 through the second manifold 10.

[0042] The U-shaped heat exchange tube 5 includes a first vertical heat exchange tube 12 , a horizontal heat exchange tube 13 and a second vertical heat exchange tube 14 . One end of the horizontal heat exchange tube 13 is connected to the first vertical heat exchange tube 12 , and the other end of the horizontal heat exchange tube 13 is connected to the second vertical heat exchange tube 14 .

[0043] The first partition 6 includes a first upper partition plate 15 and a first lower partition plate 16 . The first upper partition plate 15 is fixedly connected to the upper end of the first vertical heat exchange tube 12 , and the first lower partition plate 16 is fixedly connected to the lower end of the first vertical heat exchange tube 12 .

[0044] The first manifold member 7 includes a first upper manifold 17 and a first lower manifold 18 . The first upper manifold 17 is fixed to the first upper partition plate 15 , and the first lower manifold 18 is fixed to the first lower partition plate 16 .

[0045] The second partition 9 includes a second upper partition plate 19 and a second lower partition plate 20 . The second upper partition plate 19 is fixedly connected to the upper end of the second vertical heat exchange tube 14 , and the second lower partition plate 20 is fixedly connected to the lower end of the second vertical heat exchange tube 14 .

[0046] The second manifold 10 includes a second upper manifold 21 and a second lower manifold 22 . The second upper manifold 21 is fixed to the second upper partition plate 19 , and the second lower manifold 22 is fixed to the second lower partition plate 20 .

[0047] The high-temperature heat-conducting material 11 is heat-conducting glue.

[0048] This embodiment is another preferred implementation method. The cavity of the U-shaped heat exchange tube 5 is filled with high-temperature heat-conducting material 11. The high-temperature heat-conducting material 11 does not flow with the solution and is heated by the geothermal layer for a long time, further improving the utilization rate of geothermal energy.

[0049] Example 4

[0050] See also Figure 1-Figure 4A U-shaped heat exchange device for a medium-deep geothermal well includes a U-shaped heat exchange tube 5, a water inlet box 1, a water inlet casing 2, a water outlet casing 3 and a water outlet box 4 connected to a water outlet pump. The water inlet casing 2 is connected to the water inlet box 1, and the water outlet casing 3 is connected to the water outlet box 4. A first separator 6, a first manifold 7, a disc-shaped flow guide pipe 8, a second separator 9 and a second manifold 10 are provided in the U-shaped heat exchange tube 5. The cavity of the U-shaped heat exchange tube 5 is filled with high-temperature heat conductive material 11. The first manifold 7 is fixed on the first separator 6. The water inlet casing 2 is connected to the disc-shaped flow guide pipe 8 through the first manifold 7. The second manifold 10 is fixed on the second separator 9. The water outlet casing 3 is connected to the disc-shaped flow guide pipe 8 through the second manifold 10.

[0051] The U-shaped heat exchange tube 5 includes a first vertical heat exchange tube 12 , a horizontal heat exchange tube 13 and a second vertical heat exchange tube 14 . One end of the horizontal heat exchange tube 13 is connected to the first vertical heat exchange tube 12 , and the other end of the horizontal heat exchange tube 13 is connected to the second vertical heat exchange tube 14 .

[0052] The first partition 6 includes a first upper partition plate 15 and a first lower partition plate 16 . The first upper partition plate 15 is fixedly connected to the upper end of the first vertical heat exchange tube 12 , and the first lower partition plate 16 is fixedly connected to the lower end of the first vertical heat exchange tube 12 .

[0053] The first manifold member 7 includes a first upper manifold 17 and a first lower manifold 18 . The first upper manifold 17 is fixed to the first upper partition plate 15 , and the first lower manifold 18 is fixed to the first lower partition plate 16 .

[0054] The second partition 9 includes a second upper partition plate 19 and a second lower partition plate 20 . The second upper partition plate 19 is fixedly connected to the upper end of the second vertical heat exchange tube 14 , and the second lower partition plate 20 is fixedly connected to the lower end of the second vertical heat exchange tube 14 .

[0055] The second manifold 10 includes a second upper manifold 21 and a second lower manifold 22 . The second upper manifold 21 is fixed to the second upper partition plate 19 , and the second lower manifold 22 is fixed to the second lower partition plate 20 .

[0056] The high-temperature thermal conductive material 11 is silicon carbide.

[0057] The disc-shaped flow guide pipe 8 includes a first vertical disc-shaped flow guide pipe 23, a transverse disc-shaped flow guide pipe 24 and a second vertical disc-shaped flow guide pipe 25. The upper end of the first vertical disc-shaped flow guide pipe 23 is connected to the first upper manifold 17, the lower end of the first vertical disc-shaped flow guide pipe 23 is connected to the first lower manifold 18, one end of the transverse disc-shaped flow guide pipe 24 is connected to the first lower manifold 18, the other end of the transverse disc-shaped flow guide pipe 24 is connected to the second lower manifold 22, the upper end of the second vertical disc-shaped flow guide pipe 25 is connected to the second upper manifold 21, and the lower end of the second vertical disc-shaped flow guide pipe 25 is connected to the second lower manifold 22.

[0058] This embodiment is another preferred implementation manner. The disc-shaped flow guide pipe 8 includes a first vertical disc-shaped flow guide pipe 23, a horizontal disc-shaped flow guide pipe 24 and a second vertical disc-shaped flow guide pipe 25. The upper end of the first vertical disc-shaped flow guide pipe 23 is connected to the first upper manifold 17, the lower end of the first vertical disc-shaped flow guide pipe 23 is connected to the first lower manifold 18, one end of the horizontal disc-shaped flow guide pipe 24 is connected to the first lower manifold 18, the other end of the horizontal disc-shaped flow guide pipe 24 is connected to the second lower manifold 22, the upper end of the second vertical disc-shaped flow guide pipe 25 is connected to the second upper manifold 21, and the lower end of the second vertical disc-shaped flow guide pipe 25 is connected to the second lower manifold 22. The disc-shaped flow guide pipe 8 reduces the flow velocity of the solution in the geothermal layer, so that the solution has more sufficient time for heat exchange, thereby further improving the heat conversion efficiency.

[0059] Example 5

[0060] See also Figure 1-Figure 4 A U-shaped heat exchange device for a medium-deep geothermal well includes a U-shaped heat exchange tube 5, a water inlet box 1, a water inlet casing 2, a water outlet casing 3 and a water outlet box 4 connected to a water outlet pump. The water inlet casing 2 is connected to the water inlet box 1, and the water outlet casing 3 is connected to the water outlet box 4. A first separator 6, a first manifold 7, a disc-shaped flow guide pipe 8, a second separator 9 and a second manifold 10 are provided in the U-shaped heat exchange tube 5. The cavity of the U-shaped heat exchange tube 5 is filled with high-temperature heat conductive material 11. The first manifold 7 is fixed on the first separator 6. The water inlet casing 2 is connected to the disc-shaped flow guide pipe 8 through the first manifold 7. The second manifold 10 is fixed on the second separator 9. The water outlet casing 3 is connected to the disc-shaped flow guide pipe 8 through the second manifold 10.

[0061] The U-shaped heat exchange tube 5 includes a first vertical heat exchange tube 12 , a horizontal heat exchange tube 13 and a second vertical heat exchange tube 14 . One end of the horizontal heat exchange tube 13 is connected to the first vertical heat exchange tube 12 , and the other end of the horizontal heat exchange tube 13 is connected to the second vertical heat exchange tube 14 .

[0062] The first partition 6 includes a first upper partition plate 15 and a first lower partition plate 16 . The first upper partition plate 15 is fixedly connected to the upper end of the first vertical heat exchange tube 12 , and the first lower partition plate 16 is fixedly connected to the lower end of the first vertical heat exchange tube 12 .

[0063] The first manifold member 7 includes a first upper manifold 17 and a first lower manifold 18 . The first upper manifold 17 is fixed to the first upper partition plate 15 , and the first lower manifold 18 is fixed to the first lower partition plate 16 .

[0064] The second partition 9 includes a second upper partition plate 19 and a second lower partition plate 20 . The second upper partition plate 19 is fixedly connected to the upper end of the second vertical heat exchange tube 14 , and the second lower partition plate 20 is fixedly connected to the lower end of the second vertical heat exchange tube 14 .

[0065] The second manifold 10 includes a second upper manifold 21 and a second lower manifold 22 . The second upper manifold 21 is fixed to the second upper partition plate 19 , and the second lower manifold 22 is fixed to the second lower partition plate 20 .

[0066] The high-temperature thermal conductive material 11 is silicon carbide.

[0067] The disc-shaped flow guide pipe 8 includes a first vertical disc-shaped flow guide pipe 23, a transverse disc-shaped flow guide pipe 24 and a second vertical disc-shaped flow guide pipe 25. The upper end of the first vertical disc-shaped flow guide pipe 23 is connected to the first upper manifold 17, the lower end of the first vertical disc-shaped flow guide pipe 23 is connected to the first lower manifold 18, one end of the transverse disc-shaped flow guide pipe 24 is connected to the first lower manifold 18, the other end of the transverse disc-shaped flow guide pipe 24 is connected to the second lower manifold 22, the upper end of the second vertical disc-shaped flow guide pipe 25 is connected to the second upper manifold 21, and the lower end of the second vertical disc-shaped flow guide pipe 25 is connected to the second lower manifold 22.

[0068] The water inlet tank 1 is installed with a water inlet valve 26 and a water inlet tank pressure balancing valve 27 , and the water outlet tank 4 is installed with a water outlet valve 28 and a water outlet tank pressure balancing valve 29 .

[0069] The water outlet casing 3 includes an inner water outlet pipe 30 and an outer water outlet pipe 31 , and a heat insulation layer 32 is provided between the inner water outlet pipe 30 and the outer water outlet pipe 31 .

[0070] This embodiment is the best implementation method. The water outlet casing 3 includes an inner water outlet pipe 30 and an outer water outlet pipe 31. A heat insulation layer 32 is provided between the inner water outlet pipe 30 and the outer water outlet pipe 31, which reduces the heat energy loss during the solution transportation process and increases the utilization rate of geothermal energy.

[0071] The working principle of this utility model is as follows:

[0072] When in use, first open the water inlet valve 26 and the water inlet tank pressure balance valve 27 of the water inlet tank 1, then open the water outlet tank pressure balance valve 29 and the water outlet valve 28, and inject the low-temperature solution to be heated from the water inlet valve 26. The low-temperature solution to be heated is transported to the medium-deep geothermal section and the high geothermal section through the water inlet casing 2.

[0073] The low-temperature solution to be heated flows into the disc-shaped guide pipe 8 through the first confluence pipe 7, is transported at a constant speed in the U-shaped heat exchange tube 5 through the disc-shaped guide pipe 8, and undergoes sufficient heat exchange with the high-temperature heat-conducting material 11 filled in the cavity of the U-shaped heat exchange tube 5. Finally, the hot water after heat exchange is pumped out by the water outlet pump and pumped into the water outlet tank 4 through the water outlet casing 3 for standby use.

Claims

1. A U-shaped heat exchange device for a medium-deep geothermal well, comprising a water inlet box (1), a water inlet casing (2), a water outlet casing (3), and a water outlet box (4) connected to a water outlet pump, wherein the water inlet casing (2) is connected to the water inlet box (1), and the water outlet casing (3) is connected to the water outlet box (4), and is characterized in that: The heat exchanger further comprises a U-shaped heat exchange tube (5), wherein a first partition (6), a first confluence pipe (7), a disc-shaped flow guide pipe (8), a second partition (9) and a second confluence pipe (10) are provided in the U-shaped heat exchange tube (5), and a high-temperature heat-conducting material (11) is filled in the cavity of the U-shaped heat exchange tube (5). The first confluence pipe (7) is fixed on the first partition (6), and the water inlet sleeve (2) is connected to the disc-shaped flow guide pipe (8) through the first confluence pipe (7). The second confluence pipe (10) is fixed on the second partition (9), and the water outlet sleeve (3) is connected to the disc-shaped flow guide pipe (8) through the second confluence pipe (10).

2. A U-shaped heat exchange device for a medium-deep geothermal well according to claim 1, characterized in that: The U-shaped heat exchange tube (5) comprises a first vertical heat exchange tube (12), a horizontal heat exchange tube (13) and a second vertical heat exchange tube (14), one end of the horizontal heat exchange tube (13) being connected to the first vertical heat exchange tube (12), and the other end of the horizontal heat exchange tube (13) being connected to the second vertical heat exchange tube (14).

3. A U-shaped heat exchange device for a medium-deep geothermal well according to claim 2, characterized in that: The first partition (6) comprises a first upper partition plate (15) and a first lower partition plate (16), wherein the first upper partition plate (15) is fixedly connected to the upper end of the first vertical heat exchange tube (12), and the first lower partition plate (16) is fixedly connected to the lower end of the first vertical heat exchange tube (12).

4. A U-shaped heat exchange device for a medium-deep geothermal well according to claim 3, characterized in that: The first manifold member (7) comprises a first upper manifold (17) and a first lower manifold (18); the first upper manifold (17) is fixed on the first upper partition plate (15); and the first lower manifold (18) is fixed on the first lower partition plate (16).

5. The U-shaped heat exchange device for a medium-deep geothermal well according to claim 4, characterized in that: The second partition (9) comprises a second upper partition plate (19) and a second lower partition plate (20), wherein the second upper partition plate (19) is fixedly connected to the upper end of the second vertical heat exchange tube (14), and the second lower partition plate (20) is fixedly connected to the lower end of the second vertical heat exchange tube (14).

6. A U-shaped heat exchange device for a medium-deep geothermal well according to claim 5, characterized in that: The second manifold member (10) comprises a second upper manifold (21) and a second lower manifold (22); the second upper manifold (21) is fixed on the second upper partition plate (19), and the second lower manifold (22) is fixed on the second lower partition plate (20).

7. The U-shaped heat exchange device for a medium-deep geothermal well according to claim 1, characterized in that: The high-temperature heat-conducting material (11) is heat-conducting glue or silicon carbide.

8. The U-shaped heat exchange device for a medium-deep geothermal well according to claim 6, characterized in that: The disc-shaped flow guide pipe member (8) comprises a first vertical disc-shaped flow guide pipe (23), a transverse disc-shaped flow guide pipe (24) and a second vertical disc-shaped flow guide pipe (25), wherein the upper end of the first vertical disc-shaped flow guide pipe (23) is connected to the first upper collector pipe (17), the lower end of the first vertical disc-shaped flow guide pipe (23) is connected to the first lower collector pipe (18), one end of the transverse disc-shaped flow guide pipe (24) is connected to the first lower collector pipe (18), the other end of the transverse disc-shaped flow guide pipe (24) is connected to the second lower collector pipe (22), the upper end of the second vertical disc-shaped flow guide pipe (25) is connected to the second upper collector pipe (21), and the lower end of the second vertical disc-shaped flow guide pipe (25) is connected to the second lower collector pipe (22).

9. The U-shaped heat exchange device for a medium-deep geothermal well according to claim 1, characterized in that: The water inlet tank (1) is equipped with a water inlet valve (26) and a water inlet tank pressure balancing valve (27), and the water outlet tank (4) is equipped with a water outlet valve (28) and a water outlet tank pressure balancing valve (29).

10. The U-shaped heat exchange device for a medium-deep geothermal well according to claim 1, characterized in that: The water outlet casing (3) comprises an inner water outlet pipe (30) and an outer water outlet pipe (31), and a heat insulation layer (32) is provided between the inner water outlet pipe (30) and the outer water outlet pipe (31).

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