In-situ geothermal thermoelectric power generation device

Abstract

The utility model discloses an in-situ geothermal thermoelectric power generation device, and relates to the technical field of geothermal power generation, the in-situ geothermal thermoelectric power generation device comprises a heat exchange shell and a thermoelectric power generation array, the heat exchange shell comprises an inner hexagonal tube and an outer hexagonal tube, the inner hexagonal tube and the outer hexagonal tube are coaxially flush up and down, and six surfaces of the inner hexagonal tube and the outer hexagonal tube are correspondingly arranged in parallel; supporting partitions are connected between the corresponding edges of the inner hexagonal pipe and the outer hexagonal pipe so that the inner space between the inner hexagonal pipe and the outer hexagonal pipe can be divided into six trapezoidal medium channels which are evenly distributed in the circumferential direction, and a center hole communicated with the trapezoidal medium channels is further formed in the center of the inner hexagonal pipe in the axis direction in a penetrating mode. The thermoelectric power generation array comprises thermoelectric power generation pieces which are evenly distributed and attached to the side faces of the outer hexagonal pipe in the axis direction, the cold end faces of the thermoelectric power generation pieces face the outer hexagonal pipe, the hot end faces of the thermoelectric power generation pieces face the geothermal shaft, and therefore the temperature difference is formed on the two sides of the thermoelectric power generation pieces. The device can directly convert heat energy into electric energy, and is lower in cost and higher in efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal power generation, and more specifically to an in-situ geothermal thermoelectric power generation device. Background Art

[0002] Geothermal energy is a green, low-carbon, recyclable renewable energy with the characteristics of large reserves, wide distribution, clean and environmentally friendly, stable and reliable. It is a realistic, feasible and competitive clean energy.

[0003] The Chinese invention patent with the publication number CN107947639A discloses an integrated system of an in-situ geothermal thermoelectric power generation device, which is composed of an outermost protective layer, a high thermal conductivity gel layer in the middle for heat transfer, and an innermost cold water circulation pipe. A plurality of thermoelectric device modules for temperature difference power generation are embedded in the high thermal conductivity gel layer. The power generation device with the thermoelectric device module as the main body is connected to the ground control device. A water flow channel is left between the high thermal conductivity gel layer and the cold water circulation pipe, which can directly convert thermal energy into electrical energy, with lower cost and higher efficiency. However, due to the injection of the thermal conductive gel layer between the outer side of the cement layer and the formation, the total heat transfer coefficient of the system is greatly reduced; in addition, there is no heat insulation treatment between the water inlet and the water flow channel, which causes the warm drainage to directly heat the cooling water, reducing the temperature difference on both sides of the thermoelectric module, thereby reducing its power generation capacity. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide an in-situ geothermal thermoelectric power generation device, so as to further improve the power generation conversion efficiency while reducing the cost.

[0005] To achieve the above-mentioned purpose, the utility model provides an in-situ geothermal thermoelectric power generation device, which is vertically installed in the water-proof casing of the geothermal wellbore, and is characterized in that it includes:

[0006] The heat exchange shell comprises an inner hexagonal tube and an outer hexagonal tube which are coaxially flush with each other and are arranged in parallel on six corresponding sides, a support partition is connected between the corresponding edges of the inner hexagonal tube and the outer hexagonal tube to divide the internal space between the inner hexagonal tube and the outer hexagonal tube into six circumferentially evenly distributed trapezoidal medium channels, and a center hole communicating with the trapezoidal medium channels is also penetrated through the center of the inner hexagonal tube along the axial direction;

[0007] The thermoelectric power generation array comprises thermoelectric power generation sheets evenly distributed along the axial direction of the outer hexagonal tube and attached to each side surface of the outer hexagonal tube, the cold end of the thermoelectric power generation sheet faces the outer hexagonal tube, and the hot end of the thermoelectric power generation sheet faces the geothermal wellbore, thereby forming a temperature difference on both sides of the thermoelectric power generation sheet.

[0008] Preferably, an arc-shaped groove penetrating along the axial direction is provided on the edge of the outer hexagonal tube, and the arc-shaped groove is suitable for installing the wire of the thermoelectric power generation sheet.

[0009] Preferably, it also includes a heat-conducting shell attached to the outer surface of the temperature difference power generation array through heat-conducting silicone grease.

[0010] Preferably, the heat-conducting outer shell is a heat-conducting aluminum plate attached to the temperature difference power generation sheet on each side of the outer hexagonal tube, and there is a gap between the edges of two adjacent heat-conducting aluminum plates that is arranged opposite to the arc-shaped groove, and the gap is suitable for installing a first fixing clip for fixing the heat-conducting aluminum plate to the outer hexagonal tube.

[0011] Preferably, the first fixed clamp includes an intermediate arc-shaped clamp body suitable for being clamped in the arc-shaped groove and the gap, and a hook-shaped spring clip integrally connected to both ends of the intermediate arc-shaped clamp body, and one end of the hook-shaped spring clip away from the intermediate arc-shaped clamp body is suitable for being pressed against the corresponding thermal conductive aluminum plate.

[0012] Preferably, the inner wall of the central hole is coated with a nano thermal insulation layer.

[0013] Preferably, both ends of the outer hexagonal tube are provided with socket flanges, the outer diameter of the socket flanges is larger than the circumscribed circle diameter of the outer hexagonal tube, and two adjacent outer hexagonal tubes are suitable for butt connection through the socket flanges.

[0014] Preferably, the temperature difference power generation sheets on each side of each outer hexagonal tube are connected in series, and the temperature difference power generation arrays on the same side of the upper and lower adjacent outer hexagonal tubes are connected in parallel.

[0015] Preferably, the outer edge of the socket flange is further provided with symmetrically arranged steel cable installation notches, a steel cable clamp is installed on the outer circumference of the socket flange, and a steel cable channel is formed between the steel cable installation notches and the steel cable clamp.

[0016] Preferably, it also includes:

[0017] A circuit monitoring module, electrically connected to the thermoelectric power generation array, for monitoring the circuit on / off of the thermoelectric power generation array and data changes of voltage, current and output power; and / or

[0018] A medium cooling circulation system is arranged above the heat exchange shell; the medium cooling circulation system is configured as follows: cooling circulation medium is respectively introduced from the top openings of the six trapezoidal medium channels, flows downward through the bottom openings of the trapezoidal medium channels into the central hole, and returns to the geothermal wellhead.

[0019] Compared with the prior art, the utility model has the following advantages and effects:

[0020] 1. The in-situ geothermal thermoelectric power generation device of the utility model comprises a heat exchange shell and a temperature difference power generation array. The heat exchange shell is framed by a special-shaped hexagonal aluminum alloy tube dedicated to geothermal power generation, wherein the internal space between the outer hexagonal tube and the inner hexagonal tube is divided into six trapezoidal medium channels by a support partition, wherein a cooling medium circulates in the trapezoidal medium channels, the cooling medium enters the central hole through the bottom, and is output from the geothermal wellhead to form a cooling medium flow channel, and a temperature difference power generation sheet is selected to be pasted on each side of the outer hexagonal tube, wherein the cold end of the temperature difference power generation sheet is pasted on the surface of the outer hexagonal tube Since the outer hexagonal tube is made of aluminum alloy, the cold end of the thermoelectric power generation sheet can be well cooled, avoiding the thermal mismatch of the thermoelectric module. After the thermoelectric power generation array is completely installed on the heat exchange shell, it is placed in the hot water annulus of the geothermal well for power generation. That is, the hot end of the thermoelectric power generation sheet faces the water-proof casing of the geothermal wellbore. Due to the temperature difference on both sides of the thermoelectric power generation sheet, the thermoelectric power generation sheet can transfer a large amount of heat, thereby generating a large amount of power. The device can directly convert thermal energy into electrical energy, which is not only lower in cost but also more efficient.

[0021] 2. The heat exchange shell adopts a modular structure of aluminum alloy tube profiles, which is convenient for manufacturing temperature difference power generation tubes with built-in cooling systems, greatly reducing the manufacturing process of temperature difference power generation tubes, reducing production costs, and is conducive to the large-scale batch and standardized manufacturing of geothermal well temperature difference power generation tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a three-dimensional structure of an in-situ geothermal thermoelectric power generation device in one direction in an embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the in-situ geothermal thermoelectric power generation device in another direction in the embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the main structure of the in-situ geothermal thermoelectric power generation device in the embodiment of the utility model;

[0025] Figure 4 It is a bottom view structural schematic diagram of the in-situ geothermal thermoelectric power generation device in the embodiment of the utility model;

[0026] Figure 5 It is a schematic diagram of the top view of the structure of the in-situ geothermal thermoelectric power generation device in the embodiment of the utility model;

[0027] Figure 6 for Figure 3 Schematic diagram of the cross-sectional structure of AA;

[0028] Figure 7This is a schematic diagram of the exploded structure of the in-situ geothermal thermoelectric power generation device in the embodiment of the utility model;

[0029] Figure 8 It is a schematic diagram of the assembly structure of the inner hexagonal tube and the outer hexagonal tube in the embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1-heat exchange shell; 11-inner hexagonal tube; 12-outer hexagonal tube; 121-side; 122-arc groove; 13-support partition; 14-trapezoidal medium channel; 15-center hole; 16-nanometer insulation layer; 17-socket flange; 171-cable installation notch; 172-cable clamp;

[0032] 2-thermoelectric power generation array; 21-thermoelectric power generation sheet;

[0033] 3-heat-conducting aluminum plate; 4-first fixed clip; 41-middle arc-shaped clip body; 42-hook-shaped clip;

[0034] 5-base; 51-support base; 52-output base. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "center", "up", "down", "front", "back", "left", "right", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] Compared with other energy sources, geothermal energy has good application prospects due to its abundant reserves, clean and environmentally friendly, renewable and other advantages. Geothermal power generation is an important direction for the development of clean energy. When using geothermal energy, existing technologies are limited by the difficulty of deep energy extraction, high energy loss, low power generation efficiency and other problems. The proportion of geothermal power generation in the total power generation is still very small. Solving the above problems will break through the bottleneck of geothermal energy application and make geothermal energy more fully applied.

[0039] To solve the above technical problems, please refer to Figure 1-8 As shown, the embodiment of the utility model provides an in-situ geothermal thermoelectric power generation device, which is vertically installed in the water-proof casing of the geothermal wellbore. The in-situ geothermal thermoelectric power generation device includes a heat exchange shell 1 and a temperature difference power generation array 2, wherein:

[0040] The heat exchange shell 1 includes an inner hexagonal tube 11 and an outer hexagonal tube 12 which are coaxially flush with each other and are arranged in parallel on six corresponding surfaces. A support partition 13 is connected between the corresponding edges of the inner hexagonal tube 11 and the outer hexagonal tube 12 to divide the internal space between the inner hexagonal tube 11 and the outer hexagonal tube 12 into six circumferentially evenly distributed trapezoidal medium channels 14. A center hole 15 communicating with the trapezoidal medium channel 14 is also penetrated through the center of the inner hexagonal tube 11 along the axial direction.

[0041] The thermoelectric power generation array 2 includes thermoelectric power generation sheets 21 evenly distributed along the axial direction of the outer hexagonal tube 12 and attached to each side surface 121 of the outer hexagonal tube 12. The cold end of the thermoelectric power generation sheet 21 faces the outer hexagonal tube 12, and the hot end of the thermoelectric power generation sheet 21 faces the geothermal wellbore, thereby forming a temperature difference on both sides of the thermoelectric power generation sheet 21.

[0042] In the embodiment of the utility model, the heat exchange shell 1 is framed by a special-shaped hexagonal aluminum alloy tube dedicated to geothermal power generation, wherein the internal space between the outer hexagonal tube 12 and the inner hexagonal tube 11 is divided into six trapezoidal medium channels 14 by a support partition 13, and a cooling medium circulates in the trapezoidal medium channels 14, and the cooling medium enters the central hole 15 through the bottom, and is output from the geothermal wellhead to form a cooling medium flow channel, and a thermoelectric power generation sheet 21 is selected to be pasted on each side 121 of the outer hexagonal tube 12, wherein the cold end of the thermoelectric power generation sheet 21 is pasted to the surface of the outer hexagonal tube 12, because The outer hexagonal tube 12 is made of aluminum alloy, so that the cold end of the thermoelectric power generation sheet 21 can be well cooled, avoiding the thermal mismatch of the thermoelectric module. After the thermoelectric power generation array 2 is fully installed on the heat exchange shell 1, it is placed as a whole in the hot water annulus of the geothermal well for power generation, that is, the hot end of the thermoelectric power generation sheet 21 faces the waterproof casing of the geothermal wellbore. Due to the temperature difference formed on both sides of the thermoelectric power generation sheet 21, the thermoelectric power generation sheet 21 can transfer a large amount of heat, thereby generating a large amount of power generation. The device can directly convert thermal energy into electrical energy, which is not only lower in cost but also more efficient.

[0043] As the best preferred mode of this embodiment, both the inner hexagonal tube 11 and the outer hexagonal tube 12 are hexagonal tubular structures. The advantages of this arrangement are:

[0044] First, it is adapted to the diameter of most cylindrical geothermal wells (or oil wells), while maximizing the patch space reserved for the thermoelectric power generation sheet 21 to increase the power generation per unit depth.

[0045] Second, in terms of mechanical properties and structural strength, the hexagonal tubular structure has a relatively uniform load-bearing capacity in multiple directions, which can better disperse stress and is suitable for structures that need to be subjected to forces in multiple directions. Compared with circular tubular structures and square tubular structures, hexagonal tubular structures have better bending and torsional rigidity, and their elastic modulus is more evenly distributed, which can not only reduce deformation but also improve rigidity.

[0046] Third, the design of the hexagonal tubular structure can better fill the available space, which can improve the utilization rate of materials and reduce space and material waste compared to the circular and square tubular structures. Under the premise of maintaining the same strength, the hexagonal tubular structure cross-section can more effectively reduce stress concentration in material distribution, thereby using less material, achieving the same strength, and reducing overall weight.

[0047] Fourth, the hexagonal tubular structure can reduce eddy currents and resistance and improve fluid passing efficiency in fluid dynamics applications. The polygonal cross-section can effectively change the characteristics of the fluid boundary layer and ensure the stable flow of the fluid.

[0048] The hexagonal tubular structure can provide six planes, which is conducive to various connection and fixing operations. Compared with the circular tubular structure, it has better installation and assembly convenience; compared with the square tubular structure, it has greater space utilization.

[0049] From the production process point of view, the cost of manufacturing hexagonal tubular structures is low, and large-scale production can be achieved, which is highly consistent with product customization requirements. Compared with complex shapes, the design of hexagonal cross-sections is relatively simple, which reduces the manufacturing errors and quality control problems that may be caused by complex shapes, and improves the consistency and stability of products.

[0050] In addition, in this embodiment, a single thermoelectric power generation sheet 21 is made of a wide temperature range segmented bismuth telluride-based thermoelectric power generation chip of 40mm (length) × 40mm (width) × 3.8mm (thickness). Since the output voltage and efficiency of a single thermoelectric power generation sheet 21 are low, it is necessary to connect the thermoelectric power generation sheets 21 on each section in series to form a thermoelectric power generation array 2 to increase the output power.

[0051] For further information, see Figure 8 As shown, in the embodiment of the utility model, an arc-shaped groove 122 penetrating along the axial direction is provided on the edge of the outer hexagonal tube 12 , and the arc-shaped groove 122 is suitable for installing the wire of the temperature difference power generation sheet 21 .

[0052] Preferably, the contour of the arc groove 122 is semicircular, which is convenient for serving as a wire embedding groove for the thermoelectric power generation sheet 21, matching the wire without damaging the wire. Of course, the contour of the arc groove 122 can also be set to, for example, a triangle, etc. This embodiment does not impose any restrictions on the structural shape of the arc groove 122.

[0053] For further information, see Figure 1 , 2 As shown, in the embodiment of the present utility model, the in-situ geothermal thermoelectric power generation device further includes a heat-conducting shell attached to the outer surface of the temperature difference power generation array 2 through heat-conducting silicone grease.

[0054] Therefore, the heat conducting plate in direct contact with the hot end of the thermoelectric power generation sheet 21 is a heat conducting shell with good thermal conductivity. The hot water in the annulus of the geothermal well efficiently transfers heat to the hot end of the thermoelectric power generation sheet 21 through the heat conducting shell, so that an effective and stable temperature difference is formed on both sides of the thermoelectric power generation sheet 21. The greater the temperature difference, the greater the power generation power, thereby converting the temperature difference thermal energy between the geothermal and the cooling water into usable energy.

[0055] Of course, the material of the thermal conductive shell can be copper and brass, aluminum and aluminum alloy, carbon steel, stainless steel and thermal conductive rubber, etc. The specific comparison of thermal conductivity of different materials is as follows:

[0056] Copper and brass (thermal conductivity 386-410W / mk) > aluminum and aluminum alloy (thermal conductivity 117-237W / mk) > carbon steel (thermal conductivity 25-46.6W / mk) > stainless steel (thermal conductivity 10-16.7W / mk) > thermal conductive rubber (thermal conductivity 0.1-11.2W / mk)

[0057] In this embodiment, the heat flux density of the thermoelectric power generation sheet 21 is at least 10.4 W cm -2 To achieve the rated power generation capacity, materials with a thermal conductivity less than 48.6W / mk cannot reach 10.4Wcm -2 Heat flux density, so copper, brass, aluminum and aluminum alloys are generally used.

[0058] For further information, see Figure 1 , 6 As shown in , 7, in the embodiments of the utility model, the heat-conducting outer shell is a heat-conducting aluminum plate 3 attached to the temperature difference power generation sheet 21 on each side of the outer hexagonal tube 12, and there is a gap between the edges of two adjacent heat-conducting aluminum plates 3 that is arranged opposite to the arc-shaped groove 122, and the gap is suitable for installing the first fixing clip 4 for fixing the heat-conducting aluminum plate 3 on the outer hexagonal tube 12.

[0059] Preferably, the material of the heat-conducting aluminum plate 3 is 6061-T73 aluminum alloy, which has very good corrosion resistance and weldability. 6061-T73 aluminum alloy also has high strength, high hardness (up to HV90 degrees or more), no sand holes or pores, and good flatness. In addition, 6061-T73 aluminum alloy can be processed well, and the thermal conductivity of aluminum alloy is more than ten times that of steel, so that the power generation tube has a greater power generation capacity. Considering the thermal conductivity, mechanical strength, economic cost, etc. of the material, 6061-T73 aluminum alloy is the most suitable material for the heat-conducting shell.

[0060] For further information, see Figure 1 , 6 As shown in Figures 7 and 8, in an embodiment of the utility model, the first fixed clamp 4 includes an intermediate arc-shaped clamp body 41 suitable for clamping in the arc-shaped groove 122 and the gap, and a hook-shaped spring clip 42 integrally connected to both ends of the intermediate arc-shaped clamp body 41, and one end of the hook-shaped spring clip 42 away from the intermediate arc-shaped clamp body 41 is suitable for being pressed against the corresponding heat-conducting aluminum plate 3.

[0061] Furthermore, in an embodiment of the utility model, the inner wall of the center hole 15 is coated with a nano thermal insulation layer 16, wherein the nano thermal insulation layer 16 has an extremely low thermal conductivity [≤0.02W / (m·℃)], thereby effectively preventing the heat discharge medium in the center hole 15 from exchanging heat with the cooling medium in the trapezoidal medium channel 14.

[0062] It should be pointed out in particular that the outer side of the overall power generation tube assembly, except for the heat-conducting aluminum plate 3, must be coated with a thermal insulation coating to prevent heat transfer outside the heat-conducting aluminum plate 3 area, thereby reducing the cooling medium from absorbing unnecessary heat and ensuring that the temperature difference power generation sheet 21 can meet the temperature difference required for the expected efficiency of power generation.

[0063] For further information, see Figure 6 , 7 As shown, in the embodiment of the utility model, socket flanges 17 are provided at both ends of the outer hexagonal tube 12, and the outer diameter of the socket flange 17 is larger than the circumscribed circle diameter of the outer hexagonal tube 12, and two adjacent outer hexagonal tubes 12 are suitable for docking and connection through the socket flange 17.

[0064] Thus, the heat exchange shell 1 and the temperature difference power generation array 2 are combined to form a single section of temperature difference power generation pipe. In order to facilitate the construction and replacement of the temperature difference power generation pipe, the length of each single section of the temperature difference power generation pipe is designed to be no more than 6 meters. The depth of the geothermal wellbore is generally deep, so each section of the temperature difference power generation pipe can be connected by a socket flange 17, and a base 5 is installed at both ends of the single section of the temperature difference power generation pipe.

[0065] For details about this embodiment, please refer to Figure 1 , 2 As shown in Figure 7, a support base 51 is installed at the bottom end of a single-section temperature difference power generation tube for hot and cold water circulation and support. The support base 51 is fixedly connected to the socket flange 17 by bolts and sealing gaskets, and a steel cable channel is provided on the support base 51 to facilitate lifting. Similarly, an output base 52 is installed at the top of the uppermost section of the temperature difference power generation tube group as the input and output end of hot and cold water. The output base 52 is also fixedly connected to the socket flange 17 by bolts and sealing gaskets to ensure the internal sealing effect, and the power generation output wire passes through the output base 52.

[0066] Furthermore, in the embodiment of the present invention, the temperature difference power generation sheets 21 on each side of each outer hexagonal tube 12 are connected in series, and the temperature difference power generation arrays 2 on the same side of the upper and lower adjacent outer hexagonal tubes 12 are connected in parallel.

[0067] In this embodiment, in order to facilitate the construction and replacement of the temperature difference power generation tube, the length of the power generation tube is designed to be a short section of no more than 6 meters, and connected by flanges. Since the outer hexagonal tube 12 of each temperature difference power generation tube has six sides, when 120 thermoelectric power generation sheets 21 are installed on each side, a total of 720 sheets are installed on the six sides. The maximum power of each wide temperature range segmented bismuth telluride-based thermoelectric power generation sheet 21 is 9.8 watts, and the maximum theoretical power generation power of each thermoelectric power generation tube is 7.056 kilowatts.

[0068] It should be pointed out that thermal insulation pads, wires, diodes, etc. are embedded between the power generation sheet layers of each thermoelectric power generation sheet 21. The wires are connected in series and fixed inside the first fixed clamp 4 by wire clamps. The wires between the thermoelectric power generation arrays 2 on the same side of the upper and lower adjacent sections are further connected in parallel to form a power generation output bus.

[0069] For further information, see Figure 1 , 6 As shown in 7, in the embodiment of the utility model, the outer edge of the socket flange 17 is further provided with symmetrically arranged steel cable installation notches 171, and a steel cable clamp 172 is installed on the outer circumference of the socket flange 17, and a steel cable channel is formed between the steel cable installation notch 171 and the steel cable clamp 172.

[0070] Considering the need to vertically install the in-situ geothermal thermoelectric power generation device in the watertight casing of the geothermal wellbore, the in-situ geothermal thermoelectric power generation device can be conveniently installed in the geothermal well by connecting the steel cable in the steel cable channel of the socket flange 17.

[0071] Furthermore, in an embodiment of the present utility model, the in-situ geothermal thermoelectric power generation device further includes a line monitoring module and a medium cooling circulation system, wherein:

[0072] The line monitoring module is electrically connected to the thermoelectric power generation array 2 and is used to monitor the circuit on-off of the thermoelectric power generation array 2 and the data changes of voltage, current and output power.

[0073] The medium cooling circulation system is arranged above the heat exchange shell 1, and the medium cooling circulation system is configured as follows: cooling circulation medium is respectively introduced from the top openings of the six trapezoidal medium channels 14, flows downward through the bottom openings of the trapezoidal medium channels 14 into the central hole 15, and returns to the geothermal wellhead.

[0074] In one embodiment of the utility model, the medium cooling circulation system can utilize the terrain or ocean energy to build a matching high-water reservoir, and utilize the potential energy of water to achieve natural circulation, thereby maintaining the cold end temperature of the temperature difference power generation sheet 21.

[0075] It is understandable that, in addition to being used in geothermal wells to generate electricity, the in-situ geothermal thermoelectric power generation device can also be placed in other non-corrosive waste heat fluids to also generate electricity.

[0076] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. An in-situ geothermal thermoelectric power generation device, vertically installed in a water-proof casing of a geothermal wellbore, characterized in that: include: The heat exchange shell comprises an inner hexagonal tube and an outer hexagonal tube which are coaxially flush with each other and are arranged in parallel on six corresponding sides, a support partition is connected between the corresponding edges of the inner hexagonal tube and the outer hexagonal tube to divide the internal space between the inner hexagonal tube and the outer hexagonal tube into six circumferentially evenly distributed trapezoidal medium channels, and a center hole communicating with the trapezoidal medium channels is also penetrated through the center of the inner hexagonal tube along the axial direction; The thermoelectric power generation array comprises thermoelectric power generation sheets evenly distributed along the axial direction of the outer hexagonal tube and attached to each side surface of the outer hexagonal tube, the cold end of the thermoelectric power generation sheet faces the outer hexagonal tube, and the hot end of the thermoelectric power generation sheet faces the geothermal wellbore, thereby forming a temperature difference on both sides of the thermoelectric power generation sheet.

2. The in-situ geothermal thermoelectric power generation device according to claim 1, characterized in that: An arc-shaped groove penetrating along the axial direction is arranged on the edge of the outer hexagonal tube, and the arc-shaped groove is suitable for installing the wire of the temperature difference power generation sheet.

3. The in-situ geothermal thermoelectric power generation device according to claim 2, characterized in that: It also includes a heat-conducting shell attached to the outer surface of the temperature difference power generation array through heat-conducting silicone grease.

4. The in-situ geothermal thermoelectric power generation device according to claim 3, characterized in that: The heat-conducting outer shell is a heat-conducting aluminum plate attached to the temperature difference power generation sheets on each side of the outer hexagonal tube. There is a gap between the edges of two adjacent heat-conducting aluminum plates that is arranged opposite to the arc-shaped groove. The gap is suitable for installing a first fixing clip for fixing the heat-conducting aluminum plate on the outer hexagonal tube.

5. The in-situ geothermal thermoelectric power generation device according to claim 4, characterized in that: The first fixed clamp includes an intermediate arc-shaped clamp body suitable for clamping in the arc-shaped groove and the gap, and a hook-shaped spring clip integrally connected to both ends of the intermediate arc-shaped clamp body, and one end of the hook-shaped spring clip away from the intermediate arc-shaped clamp body is suitable for being pressed against the corresponding heat-conducting aluminum plate.

6. The in-situ geothermal thermoelectric power generation device according to claim 1, characterized in that: The inner wall of the central hole is coated with a nano thermal insulation layer.

7. The in-situ geothermal thermoelectric power generation device according to claim 1, characterized in that: Socket flanges are provided at both ends of the outer hexagonal tube, the outer diameter of the socket flange is larger than the circumscribed circle diameter of the outer hexagonal tube, and two adjacent outer hexagonal tubes are suitable for butt connection through the socket flanges.

8. The in-situ geothermal thermoelectric power generation device according to claim 1, characterized in that: The temperature difference power generation sheets on the side surfaces of each outer hexagonal tube are connected in series, and the temperature difference power generation arrays on the same side surface of the upper and lower adjacent outer hexagonal tubes are connected in parallel.

9. The in-situ geothermal thermoelectric power generation device according to claim 7, characterized in that: The outer edge of the socket flange is also provided with symmetrically arranged steel cable installation notches, and a steel cable clamp is installed on the outer circumference of the socket flange, and a steel cable channel is formed between the steel cable installation notch and the steel cable clamp.

10. The in-situ geothermal thermoelectric power generation device according to claim 1, characterized in that: Also includes: A circuit monitoring module, electrically connected to the thermoelectric power generation array, for monitoring the circuit on-off of the thermoelectric power generation array and data changes of voltage, current and output power; and / or A medium cooling circulation system is arranged above the heat exchange shell; the medium cooling circulation system is configured as follows: cooling circulation medium is respectively introduced from the top openings of the six trapezoidal medium channels, flows downward through the bottom openings of the trapezoidal medium channels into the central hole, and returns to the geothermal wellhead.

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