Heat removal pipe with heat preservation structure for hot rock stratum

Abstract

The utility model relates to the technical field of geothermal well heat removal, in particular to a heat removal pipe with a heat preservation structure for a hot rock stratum, which comprises an outer pipe, an inner pipe and a vacuum pump, the inner pipe is arranged in the outer pipe, a limiting pipe is mounted at the bottom of the inner pipe, and the bottom of the limiting pipe is fixedly connected with the outer pipe; the input end of the vacuum pump is communicated with a sealing cylinder, the inner side of the sealing cylinder is fixedly connected with supporting plates which are uniformly distributed, the other ends of the supporting plates are fixedly connected with the inner pipe, and the upper side and the lower side of the sealing cylinder and the inner pipe are arranged in a sealing mode; the sealing cylinder is arranged on the outer side of the inner pipe, the inner pipe and the sealing cylinder are vacuumized through the vacuum pump, when circulating water flows back, the heat insulation effect in the vacuum state is better, the temperature of backflow water can be effectively guaranteed, the arranged supporting plate can achieve the purpose of supporting the sealing cylinder in the vacuumizing process, and the sealing effect is better. Collapse and sinking of the sealing cylinder can be effectively guaranteed, and the heat insulation effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal well heat extraction, in particular to a heat extraction pipe for hot rock layers with a heat insulation structure. Background Art

[0002] Geothermal wells refer to methods and devices for generating electricity using geothermal energy from wells approximately 3,500 meters deep or from hot spring water with a temperature greater than 30°C. Geothermal energy is categorized as high-temperature, medium-temperature, and low-temperature. High-temperature geothermal energy is defined as steam above 150°C; medium-temperature geothermal energy is defined as a mixture of water and steam between 90°C and 150°C; and low-temperature geothermal energy is defined as warm water, lukewarm water, or hot water, above 25°C and below 90°C.

[0003] When utilizing hot rock layers for heat extraction, the traditional method is to allow circulating water to flow into the hot rock layers, and then the circulating water exchanges heat with the hot rock layers, the circulating water becomes hot, and then flows back upwards to achieve the purpose of heat extraction. However, the upper soil and the circulating water have lower temperatures. When the hot water flows back, it is easy to cause a waste of heat resources and affect the heat extraction efficiency. Therefore, in order to address the above problems, a heat extraction pipe for hot rock layers with an insulation structure is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a heat pipe for hot rock layer with a heat insulation structure to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] As an optional solution of the heat extraction pipe for hot rock layer with a thermal insulation structure described in the utility model, wherein: a heat extraction pipe for hot rock layer with a thermal insulation structure comprises an outer tube, an inner tube and a vacuum pump, wherein the inner tube is provided inside the outer tube, a limiting tube is installed at the bottom of the inner tube, and the bottom of the limiting tube is fixedly connected to the outer tube;

[0007] The input end of the vacuum pump is connected to a sealing cylinder, the inner side of which is fixedly connected to evenly distributed support plates, the other end of which is fixedly connected to the inner tube, and the upper and lower sides of the sealing cylinder are sealed to the inner tube;

[0008] The inner tube is fixedly connected with a heat preservation tube.

[0009] As an optional solution of the device for obtaining heat from hot rock layers described in the present invention, a valve is installed on the outside of the connecting pipe connecting the vacuum pump and the sealing cylinder.

[0010] When utilizing hot rock layers for heat extraction, the traditional method is to allow circulating water to flow into the hot rock layers, and then the circulating water exchanges heat with the hot rock layers, the circulating water becomes hot, and then flows back to the top to achieve the purpose of heat extraction. However, the temperature of the upper soil and the circulating water is relatively low. When the hot water flows back, it is easy to cause waste of heat resources and affect the heat extraction efficiency. When this device is used, an external power supply is required. This device is provided with a sealing cylinder on the outside of the inner tube. The inner tube and the sealing cylinder are evacuated by a vacuum pump. When the circulating water flows back, its vacuum state has a better heat insulation effect, which can effectively ensure the temperature of the return water. In addition, when evacuating, the support plate provided can support the sealing cylinder, which can effectively ensure that the sealing cylinder collapses and sinks, ensuring the heat insulation effect. The setting of the valve can ensure that the connecting pipe is closed to avoid poor sealing.

[0011] As an optional solution of the device for obtaining heat from hot rock layers described in the present invention, a detection tube is connected to the side of the sealing cylinder, and an oxygen sensor detector is installed on the other side of the detection tube.

[0012] The detection tube and oxygen sensor detector are connected to the sealing cylinder through the detection tube. At the same time, the oxygen sensor detector plays the role of detecting the gas inside the sealing cylinder. When the oxygen sensor detector detects the presence of oxygen, it means that the sealing cylinder is leaking and needs to be repaired in time.

[0013] As an optional solution of the heat extraction device utilizing hot rock layer described in the present invention, a heat extraction hole is opened on the outside of the limiting tube, and a vertically arranged guide plate is installed inside the limiting tube.

[0014] As an optional solution of the device for obtaining heat from hot rock layers described in the present invention, the guide plate is arranged in a flat shape, and both sides above the guide plate are arranged in inclined surfaces.

[0015] A guide plate is provided at the bottom of the inner tube. The guide plate is located inside the inner tube, and the outer side of the guide plate is in close contact with the inner tube, thereby achieving the purpose of supporting and fixing the inner tube to prevent it from shaking. The two sides above the guide plate are inclined, thereby ensuring that the inner tube is stably sleeved on the outer side of the guide plate to achieve the purpose of guidance.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model is provided with a sealing cylinder on the outside of the inner tube, and the inner tube and the sealing cylinder are evacuated by a vacuum pump. When the circulating water refluxes, the heat insulation effect of the vacuum state is better, and the temperature of the reflux water can be effectively guaranteed. In addition, when the vacuum is evacuated, the support plate provided can support the sealing cylinder, and can effectively ensure that the sealing cylinder collapses and sinks, thereby ensuring the heat insulation effect.

[0018] The detection tube and the oxygen sensor detector are connected to the sealing cylinder through the detection tube. At the same time, the oxygen sensor detector plays the role of detecting the gas inside the sealing cylinder. When the oxygen sensor detector detects the presence of oxygen, it means that the sealing cylinder is leaking and needs to be repaired in time.

[0019] The guide plate can support the inner tube and prevent the inner tube from shaking. The two sides of the guide plate are inclined. At this time, the inclined surface serves the purpose of guidance, ensuring that the inner tube is stably sleeved on the outer side of the guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a cross-sectional view of the inner tube of the utility model;

[0022] Figure 3 This is a cross-sectional view of the limiting tube of the utility model;

[0023] Figure 4 This is a structural diagram of the guide plate of the utility model.

[0024] In the figure: 1. Outer tube; 2. Inner tube; 3. Limiting tube; 4. Sealing tube; 5. Vacuum pump; 6. Valve; 7. Detection tube; 8. Oxygen sensor detector; 9. Insulation tube; 10. Support plate; 11. Heat extraction hole; 12. Guide plate. DETAILED DESCRIPTION

[0025] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0026] Example 1: Please refer to Figure 1 and Figure 2 , the utility model provides a technical solution:

[0027] A device for extracting heat from a hot rock layer comprises an outer tube 1, an inner tube 2 and a vacuum pump 5. The inner tube 2 is provided inside the outer tube 1, a limiting tube 3 is installed at the bottom of the inner tube 2, and the bottom of the limiting tube 3 is fixedly connected to the outer tube 1.

[0028] The input end of the vacuum pump 5 is connected to a sealing cylinder 4. The inner side of the sealing cylinder 4 is fixedly connected to evenly distributed support plates 10. The other end of the support plates 10 is fixedly connected to the inner tube 2. The upper and lower sides of the sealing cylinder 4 are sealed with the inner tube 2.

[0029] A heat preservation pipe 9 is fixedly connected to the interior of the inner pipe 2 .

[0030] A valve 6 is installed on the outside of the connecting pipe connecting the vacuum pump 5 and the sealing cylinder 4.

[0031] When utilizing hot rock layers for heat extraction, the traditional method is to allow circulating water to flow into the hot rock layers, and then the circulating water exchanges heat with the hot rock layers, the circulating water becomes hot, and then flows back to the top to achieve the purpose of heat extraction, while the upper soil and circulating water temperatures are relatively low. When the hot water flows back, it is easy to cause waste of heat resources, affecting the efficiency of heat extraction. When this device is used, an external power supply is connected. This device is provided with a sealing cylinder 4 on the outside of the inner tube 2. The inner tube 2 and the sealing cylinder 4 are evacuated by a vacuum pump 5. When the circulating water flows back, its vacuum state has a better heat insulation effect, which can effectively ensure the temperature of the return water, and when evacuating, the support plate 10 provided can support the sealing cylinder 4, which can effectively ensure that the sealing cylinder 4 collapses and sinks, ensuring the heat insulation effect. The setting of the valve 6 can ensure that the connecting pipe is closed to avoid poor sealing, and the insulation pipe 9 serves a certain purpose of heat insulation.

[0032] Example 2: This example is an improvement on Example 1. Figure 3 and Figure 4 , specifically,

[0033] A heat extraction hole 11 is provided on the outer side of the limiting tube 3 , and a vertically arranged guide plate 12 is installed inside the limiting tube 3 .

[0034] The guide plate 12 is flat, and both sides of the upper portion of the guide plate 12 are inclined.

[0035] A guide plate 12 is provided at the bottom of the inner tube 2. The guide plate 12 is located inside the inner tube 2, and the outer side of the guide plate 12 is in close contact with the inner tube 2 to achieve the purpose of supporting and fixing the inner tube 2 to prevent it from shaking. The two sides above the guide plate 12 are arranged at an angle, which ensures that the inner tube 2 is stably sleeved on the outer side of the guide plate 12 to achieve the purpose of guidance. The guide plate 12 is arranged in a flat shape, and its hot water and hot air can enter the inner tube 2 through both sides of the guide plate 12.

[0036] Example 3

[0037] This embodiment is an improvement on embodiment 2. Figure 1 Specifically, the side of the sealing cylinder 4 is connected to a detection tube 7, and the other side of the detection tube 7 is installed with an oxygen sensor detector 8.

[0038] The detection tube 7 and the oxygen sensor detector 8 are connected to the sealing tube 4 through the detection tube 7. At the same time, the oxygen sensor detector 8 plays the role of detecting the gas inside the sealing tube 4. When the oxygen sensor detector 8 detects the presence of oxygen, it means that the sealing tube 4 is leaking and needs to be repaired in time.

[0039] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat pipe for hot rock formations with a heat insulation structure, characterized by: It comprises an outer tube (1), an inner tube (2) and a vacuum pump (5); the inner tube (2) is provided inside the outer tube (1); a limiting tube (3) is installed at the bottom of the inner tube (2); and the bottom of the limiting tube (3) is fixedly connected to the outer tube (1); The input end of the vacuum pump (5) is connected to a sealing cylinder (4), the inner side of the sealing cylinder (4) is fixedly connected to uniformly distributed support plates (10), the other end of the support plate (10) is fixedly connected to the inner tube (2), and the upper and lower sides of the sealing cylinder (4) are sealed with the inner tube (2); A heat preservation pipe (9) is fixedly connected to the interior of the inner pipe (2).

2. The heat extraction pipe for hot rock formations with a thermal insulation structure according to claim 1, characterized in that: A heat extraction hole (11) is provided on the outside of the limiting tube (3), and a vertically arranged guide plate (12) is installed inside the limiting tube (3).

3. The heat extraction pipe for hot rock formations with a heat insulation structure according to claim 2, characterized in that: The guide plate (12) is arranged in a flat shape, and both sides above the guide plate (12) are arranged in inclined surfaces.

4. The heat extraction pipe for hot rock formations with a heat insulation structure according to claim 1, characterized in that: A valve (6) is installed on the outside of the connecting pipe connecting the vacuum pump (5) and the sealing cylinder (4).

5. The heat extraction pipe for hot rock formations with a heat insulation structure according to claim 1, characterized in that: The side of the sealing cylinder (4) is connected to a detection tube (7), and the other side of the detection tube (7) is installed with an oxygen sensor detector (8).

Images