A new heat exchange device for coaxial heat exchange of middle-deep geothermal well

Abstract

The utility model belongs to the technical field of middle -deep layer geothermal well, especially a new heat exchange device for middle -deep layer geothermal well coaxial heat exchange, including heat exchange box, the top fixed mounting of heat exchange box has circulating pump, and circulating pump will water flow provided by water supply pipeline transmission to heat conduction coil pipe, and heat exchange box is heat conduction material, and the bottom of heat exchange box is provided with heat conduction fin, and heat exchange box can be installed in geothermal well inside, and control heat conduction plate conducts the heat generated by heat exchange box, and heat conduction coil pipe is connected with multiple heat conduction fins and heat conduction plate, can let heat conduction coil pipe adsorb heat and conduct to water flow, thereby let the water flow temperature of outlet pipe discharge be higher, and the heat preservation sleeve can heat preservation to the water flow in the inside of outlet pipe, prevent the condition that heat loss appears, and multiple heat conduction coil pipes make the utilization rate of the device to heat be bigger, and the calibre of heat conduction coil pipe is smaller, makes inside water flow heating more uniform.

Description

Technical Field

[0001] This utility model relates to the field of medium-deep geothermal well technology, and in particular to a novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells. Background Technology

[0002] Geothermal energy is a renewable energy source that is abundant, relatively inexpensive, and widely distributed. In particular, the medium-deep geothermal energy in the 200m-3000m depth range has high utilization value. Currently, the medium-deep geothermal well heat exchange technology is a technology that uses coaxial casing in deep wells to circulate fluids inside the well and exchange heat with the formation based on heat conduction, thereby developing deep geothermal energy in the form of "extracting heat without extracting water". Existing heat exchange devices, due to their thick heat conduction pipes, require a long time for the internal water flow to absorb heat from the pipes. Furthermore, the small contact area between the pipes and the external heat conduction device leads to significant heat loss, resulting in low heat utilization. Therefore, we propose a novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells. Utility Model Content

[0003] The purpose of this invention is to provide a novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells, which solves the existing problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells includes a heat exchange box, a circulating pump fixedly installed on the top of the heat exchange box, a water supply pipe fixedly installed at the input end of the circulating pump, a heat-conducting coil fixedly installed at the output end of the circulating pump, multiple heat-conducting plates fixedly installed on the inner side of the heat exchange box, and heat-conducting fins fixedly installed at the bottom of the heat exchange box.

[0005] As a further improvement to the above solution, the heat-conducting coil, heat-conducting fins, and heat-conducting plate include a heat-conducting core layer, a composite reinforcement layer, a metal skeleton layer, a buffer protection layer, and a wear-resistant protection layer. The composite reinforcement layer is fixedly installed on one side of the heat-conducting core layer, the metal skeleton layer is fixedly installed on one side of the composite reinforcement layer, the buffer protection layer is fixedly installed on one side of the metal skeleton layer, and the wear-resistant protection layer is fixedly installed on one side of the buffer protection layer. The heat-conducting coil is attached to the heat-conducting fins and the heat-conducting plate.

[0006] As a further improvement to the above solution, a water outlet pipe is fixedly installed at the output end of the heat-conducting coil, and an insulation sleeve is fixedly installed on the outside of the water outlet pipe.

[0007] As a further improvement to the above solution, the insulation sleeve is made of aerogel felt and polyurethane foam.

[0008] As a further improvement to the above solution, the heat-conducting core layer is made of copper and has a thickness of 8mm.

[0009] As a further improvement to the above solution, the composite reinforcement layer is made of carbon fiber and has a thickness of 10 mm.

[0010] As a further improvement to the above solution, the metal skeleton layer is made of aluminum alloy and has a thickness of 9mm.

[0011] As a further improvement to the above solution, the material of the buffer protective layer is ethylene-vinyl acetate copolymer, the material of the wear-resistant protective layer is polyethylene, and the thickness of the buffer protective layer and the wear-resistant protective layer is 7mm.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) A novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells, wherein the circulating pump transmits the water flow provided by the water supply pipeline to the heat-conducting coil, the heat exchange box is made of heat-conducting material, and the bottom of the heat exchange box is provided with heat-conducting fins. The heat exchange box can be installed inside the geothermal well, and the heat-conducting plate is controlled to conduct the heat generated by the heat exchange box. The heat-conducting coil is connected to multiple heat-conducting fins and heat-conducting plates, which allows the heat-conducting coil to absorb and conduct heat to the water flow, thereby making the water flow discharged from the outlet pipe at a higher temperature. The insulation sleeve can keep the water flow inside the outlet pipe warm and prevent heat loss. Multiple heat-conducting coils make the device have a higher heat utilization rate. The diameter of the heat-conducting coil is small, making the internal water flow more uniformly heated. (2) A novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells of this utility model uses high-purity copper as the base material for heat-conducting plates and heat-conducting coils in the heat-conducting core layer. Copper has a high thermal conductivity and excellent heat conduction performance. The heat-conducting coil adopts an internal rib design with multiple trapezoidal ribs evenly distributed on the inner wall of the tube, which can enhance the heat exchange efficiency with the circulating water flow and ensure that geothermal energy is quickly and efficiently transferred to the water flow. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional structural diagram of a novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells proposed in this utility model. Figure 2 This is a partial three-dimensional structural schematic diagram of a novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells proposed in this utility model. Figure 3 This is a partial three-dimensional structural schematic diagram of a novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells proposed in this utility model. Figure 4 This is a partial three-dimensional structural schematic diagram of a novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells proposed in this utility model. Figure 5 This is a partial three-dimensional structural diagram of a novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells proposed in this utility model.

[0015] In the diagram: 1. Heat exchanger; 2. Circulating pump; 3. Water supply pipe; 4. Heat-conducting plate; 5. Heat-conducting fins; 6. Heat-conducting coil; 7. Water outlet pipe; 8. Insulation sleeve; 9. Heat-conducting core layer; 10. Composite reinforcement layer; 11. Metal skeleton layer; 12. Buffer protection layer; 13. Wear-resistant protection layer. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] refer to Figures 1-5A novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells includes a heat exchange box 1. A circulating pump 2 is fixedly installed on the top of the heat exchange box 1. A water supply pipe 3 is fixedly installed at the input end of the circulating pump 2. A heat-conducting coil 6 is fixedly installed at the output end of the circulating pump 2. Multiple heat-conducting plates 4 are fixedly installed inside the heat exchange box 1. Heat-conducting fins 5 are fixedly installed at the bottom of the heat exchange box 1. The circulating pump 2 transmits the water supplied by the water supply pipe 3 to the heat-conducting coil 6. The heat exchange box 1 is made of a heat-conducting material, and the bottom of the heat exchange box 1 is provided with heat-conducting fins 5. The heat exchange box 1 can be installed inside the geothermal well, and the heat-conducting plates 4 are controlled to conduct the heat generated by the heat exchange box 1. The heat-conducting coil 6 is connected to the multiple heat-conducting fins 5 and the heat-conducting plates 4, allowing the heat-conducting coil 6 to absorb heat and conduct it to the water flow, thereby making the temperature of the water discharged from the outlet pipe 7 relatively high. The heat-conducting coil 8 can insulate the water flow inside the outlet pipe 7 to prevent heat loss. Multiple heat-conducting coils 6 make the device have a high heat utilization rate. The small diameter of the heat-conducting coil 6 makes the internal water flow more uniformly heated. In a further preferred embodiment of the present invention, the heat-conducting coil 6, heat-conducting fins 5 and heat-conducting plate 4 include a heat-conducting core layer 9, a composite reinforcement layer 10, a metal skeleton layer 11, a buffer protection layer 12 and a wear-resistant protection layer 13. The composite reinforcement layer 10 is fixedly installed on one side of the heat-conducting core layer 9, the metal skeleton layer 11 is fixedly installed on one side of the composite reinforcement layer 10, the buffer protection layer 12 is fixedly installed on one side of the metal skeleton layer 11, and the wear-resistant protection layer 13 is fixedly installed on one side of the buffer protection layer 12. The heat-conducting coil 6 is attached to the heat-conducting fins 5 and the heat-conducting plate 4.

[0018] In a further preferred embodiment of the present invention, a water outlet pipe 7 is fixedly installed at the output end of the heat-conducting coil 6, and an insulation sleeve 8 is fixedly installed on the outside of the water outlet pipe 7; in a further preferred embodiment of the present invention, the insulation sleeve 8 is made of aerogel felt and polyurethane foam.

[0019] In a further preferred embodiment of this utility model, the heat-conducting core layer 9 is made of copper and has a thickness of 8mm. The heat-conducting core layer 9 uses high-purity copper as the base material for the heat-conducting plate 4 and the heat-conducting coil 6. Copper has a high thermal conductivity and excellent heat conduction performance. The heat-conducting coil 6 adopts an internal ribbed tube design with multiple trapezoidal ribs evenly distributed on the inner wall of the tube, which can enhance the heat exchange efficiency with the circulating water flow and ensure that geothermal energy is quickly and efficiently transferred to the water flow.

[0020] In a further preferred embodiment of this utility model, the composite reinforcement layer 10 is made of carbon fiber and has a thickness of 10mm. The composite reinforcement layer 10 wraps a carbon fiber reinforced resin-based composite material layer around the heat-conducting plate 4 and the heat-conducting coil 6. Carbon fiber has the characteristics of high strength, high tensile strength, and high elastic modulus. After being combined with resin, it forms a continuous and dense reinforcement structure, which can not only effectively improve the overall mechanical strength of the heat-conducting component and resist external extrusion and impact, but also reduce unnecessary heat conduction to the outside to a certain extent due to its low thermal conductivity, thus playing an auxiliary heat preservation role.

[0021] In a further preferred embodiment of this utility model, the metal skeleton layer 11 is made of aluminum alloy and has a thickness of 9mm. The metal skeleton layer 11 is constructed using high-strength aluminum alloy to form a three-dimensional mesh-like metal skeleton, and the skeleton members have a square hollow cross-section. The metal skeleton is tightly attached to the outside of the composite reinforcement layer 10 and is fixedly connected to the heat-conducting plate 4 and heat-conducting coil 6 by welding, providing a stable support frame for the entire structure and enhancing its resistance to pressure and deformation. At the same time, aluminum alloy itself has good thermal conductivity and thermal conductivity coefficient, so the overall thermal conductivity is not affected while strengthening.

[0022] In a further preferred embodiment of this utility model, the buffer protective layer 12 is made of ethylene-vinyl acetate copolymer, and the wear-resistant protective layer 13 is made of polyethylene. The thickness of the buffer protective layer 12 and the wear-resistant protective layer 13 is 7mm. The buffer protective layer 12 covers the outside of the metal skeleton layer 11 with ethylene-vinyl acetate copolymer buffer material. It has good flexibility, elasticity and buffering performance, and can absorb external vibration and impact, protect the internal heat conduction and reinforce the structure. Its surface is provided with a wavy textured surface to increase the contact friction with the outer material, prevent interlayer displacement caused by thermal expansion and contraction, and further improve the structural stability. The outermost layer of the wear-resistant protective layer 13 is made of ultra-high molecular weight polyethylene. Ultra-high molecular weight polyethylene has extremely high wear resistance, impact resistance and chemical stability, and can effectively resist the damage to the internal structure caused by external environmental factors such as sand and gravel friction and acid and alkali corrosion. The surface is specially treated to form a smooth hardened coating, which reduces fluid flow resistance, reduces dirt adhesion, and ensures long-term stable operation of the heat conduction component.

[0023] The implementation principle of a novel heat exchange device for coaxial heat exchange in a medium-deep geothermal well in this application embodiment is as follows: the circulating pump 2 transmits the water flow provided by the water supply pipe 3 to the heat-conducting coil 6. The heat exchange box 1 is made of heat-conducting material, and heat-conducting fins 5 are provided at the bottom of the heat exchange box 1. The heat exchange box 1 can be installed inside the geothermal well, and the heat-conducting plate 4 is controlled to conduct the heat generated by the heat exchange box 1. The heat-conducting coil 6 is connected to multiple heat-conducting fins 5 and heat-conducting plate 4, which allows the heat-conducting coil 6 to absorb heat and conduct it to the water flow, thereby making the water flow discharged from the outlet pipe 7 at a higher temperature. The insulation sleeve 8 can keep the water flow inside the outlet pipe 7 warm and prevent heat loss. Multiple heat-conducting coils 6 make the device have a high heat utilization rate. The small diameter of the heat-conducting coil 6 makes the internal water flow heated more evenly. The heat-conducting core layer 9 uses high-purity copper as the base material for the heat-conducting plate 4 and the heat-conducting coil 6. Copper has a high thermal conductivity and excellent heat conduction performance. The heat-conducting coil 6 adopts an internal finned tube design with multiple trapezoidal fins evenly distributed on the inner wall of the tube, which can enhance the heat exchange efficiency with the circulating water flow and ensure that geothermal energy is quickly and efficiently transferred to the water flow. The composite reinforcement layer 10 wraps a carbon fiber reinforced resin matrix composite material layer on the outside of the heat-conducting plate 4 and the heat-conducting coil 6. Carbon fiber has the characteristics of high strength, high tensile strength, high elastic modulus and high elastic modulus. After being combined with resin, it forms a continuous and dense reinforcement structure, which can not only effectively improve the overall mechanical strength of the heat-conducting component and resist external extrusion and impact, but also reduce unnecessary heat conduction to the outside to a certain extent due to its low thermal conductivity, thus playing an auxiliary heat preservation role. The metal skeleton layer 11 is constructed from high-strength aluminum alloy to form a three-dimensional mesh-like metal skeleton. The skeleton members have a square hollow cross-section. The metal skeleton is tightly attached to the outside of the composite reinforcement layer 10 and is fixedly connected to the heat-conducting plate 4 and heat-conducting coil 6 by welding, providing a stable support frame for the entire structure and enhancing its resistance to pressure and deformation. At the same time, the aluminum alloy itself has good thermal conductivity and thermal conductivity coefficient, so the overall thermal conductivity is not affected while strengthening the structure. The buffer protective layer 12 covers the outside of the metal skeleton layer 11 with ethylene-vinyl acetate copolymer buffer material; it has good flexibility, elasticity and buffer performance, and can absorb external vibration and impact force, protect the internal heat conduction and reinforcement structure; its surface is provided with a wavy textured surface to increase the contact friction with the outer material, prevent interlayer displacement caused by thermal expansion and contraction, and further improve the structural stability. The outermost layer of the wear-resistant protective layer 13 is made of ultra-high molecular weight polyethylene (UHMWPE). UHMWPE has extremely high wear resistance, impact resistance, and chemical stability, which can effectively resist damage to the internal structure caused by external environmental factors such as sand and gravel friction and acid and alkali corrosion. The surface is specially treated to form a smooth hardened coating, which reduces fluid flow resistance, reduces dirt adhesion, and ensures long-term stable operation of the heat-conducting components.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The above provides a detailed description of a novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells, as provided by this utility model. Specific embodiments have been used to illustrate the principles and implementation methods of this utility model. These embodiments are merely illustrative and are intended to aid in understanding the method and core concepts of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this utility model.

Claims

1. A novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells, characterized in that, include: A heat exchange box (1) is provided with a circulating pump (2) fixedly installed on its top, a water supply pipe (3) fixedly installed at the input end of the circulating pump (2), a heat-conducting coil (6) fixedly installed at the output end of the circulating pump (2), multiple heat-conducting plates (4) fixedly installed on the inner side of the heat exchange box (1), and heat-conducting fins (5) fixedly installed at the bottom of the heat exchange box (1). The heat-conducting coil (6), heat-conducting fins (5) and heat-conducting plates (4) include a heat-conducting core layer (9) and a composite reinforcement layer (10). The composite reinforcement layer (10) is fixedly installed on one side of the heat-conducting core layer (9), the metal skeleton layer (11) is fixedly installed on one side of the composite reinforcement layer (10), the buffer protection layer (12) is fixedly installed on one side of the metal skeleton layer (11), and the wear-resistant protection layer (13) is fixedly installed on one side of the buffer protection layer (12). The heat-conducting coil (6) is attached to the heat-conducting fins (5) and the heat-conducting plate (4).

2. A novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells according to claim 1, characterized in that, A water outlet pipe (7) is fixedly installed at the output end of the heat-conducting coil (6), and an insulation sleeve (8) is fixedly installed on the outside of the water outlet pipe (7).

3. A novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells according to claim 1, characterized in that, The heat-conducting core layer (9) is made of copper and has a thickness of 8 mm.

4. A novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells according to claim 1, characterized in that, The composite reinforcement layer (10) is made of carbon fiber and has a thickness of 10 mm.

5. A novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells according to claim 1, characterized in that, The metal skeleton layer (11) is made of aluminum alloy and has a thickness of 9 mm.

6. A novel heat exchange device for coaxial heat exchange in medium-deep geothermal wells according to claim 1, characterized in that, The buffer protective layer (12) is made of ethylene-vinyl acetate copolymer, the wear-resistant protective layer (13) is made of polyethylene, and the thickness of the buffer protective layer (12) and the wear-resistant protective layer (13) is 7 mm.

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