Geothermal power generation pipe

Abstract

The invention discloses a geothermal power generation pipe. The geothermal power generation pipe comprises a water inlet pipe, a controller, a water outlet pipe, a geothermal pipe outer heat conduction pipe, a geothermal pipe inner heat conduction pipe, a conductive groove track, a temperature difference power generation chip, a lower plug, an upper plug, a cement groove, a geothermal pipe top end flange, a direct connector, an electromagnetic valve, a temperature sensor, a heat resistance fixing piece, heat insulation waterproof curing glue, a temperature difference power generation chip, a power transmission current collecting strip and the like. External liquid flows into the bottom of the geothermal power generation pipe after being controlled by the controller and then slowly flows out of the geothermal power generation pipe, and temperature difference power generation is carried out on the front and back surfaces of the temperature difference power generation chip through the heat conduction fins of the outer heat conduction pipe and the inner heat conduction pipe by utilizing the temperature difference between the external liquid and geothermal water. And the generated electricity is rectified by the controller to be constant in voltage and then is transmitted to the main loop circuit.

Description

Technical Field

[0001] This invention relates to the field of geothermal power generation technology, specifically to a geothermal power generation pipe. Background Technology

[0002] With the increasing severity of global climate change and environmental degradation, clean energy has become a global focus. Clean energy, or renewable energy, refers to energy sources that produce relatively little pollution during consumption or can be replenished, such as solar, wind, hydro, bioenergy, and geothermal energy. These energy sources not only help mitigate global warming and reduce air pollution but also provide a stable and sustainable energy supply. Geothermal energy is a relatively little-known but highly promising clean energy source. The Earth's interior contains vast thermal energy resources, which can be converted into usable energy through technologies such as geothermal power generation and geothermal heating. Geothermal energy not only has environmental advantages but can also provide a stable energy supply to remote areas. China has a vast territory with 1.8 billion mu of arable land. Farmland is inefficient for growing crops. If geothermal power generation pipes, tens of meters long, were densely distributed 1.5 meters below the surface and spaced 10 meters apart, the generated electricity could be used to produce green hydrogen on-site. Each village could then become a green energy plant. Clean energy is key to achieving sustainable development and addressing climate change. By vigorously promoting clean energy technologies, we can reduce environmental pollution, protect the Earth's ecosystem, and create a better future for future generations. Summary of the Invention

[0003] The purpose of the embodiments disclosed in this invention is to provide a geothermal power generation pipe to address human sustainable development and global climate change, thereby reducing environmental pollution and protecting the Earth's ecology.

[0004] The embodiments disclosed in this invention adopt the following technical solution: A geothermal power generation pipe, comprising: an inlet pipe, a controller, an outlet pipe, an external heat-conducting pipe for the geothermal pipe, an insulating pad, insulating adhesive material, an inner heat-conducting pipe for the geothermal pipe, a conductive groove track, a thermoelectric power generation chip, a lower plug, soil, a cement trough, a cement trough cover plate, an upper plug, a top flange of the geothermal pipe, an inlet area, an outlet area, a PVC quick-connect fitting, fixing screws, water from a deep well, clamps, sealing gaskets, sealant, a solenoid valve, a temperature sensor, a heat-insulating fixing plate, heat-insulating and waterproof curing adhesive, sealing gaskets, fixing screws, etc.

[0005] In some embodiments of the invention, the geothermal power generation pipe is characterized by a double-layered insulated water pipe, made of double-layered plastic pipe with an inner insulating material. The inlet insulated pipe connects to the external main water supply pipe, passes through a cement trough sleeve, is sealed at the top with a capping sleeve, and after passing through a solenoid valve and temperature sensor, directly connects to the double-layered insulated water pipe at the center of the geothermal power generation pipe's flange, reaching the bottom of the geothermal power generation pipe. The return water flows upwards along the wall seam of the heat exchange inner pipe and the inlet insulated pipe, directly onto the insulated pipe flange, and connects to the return water pipe, which is then connected to the main return water pipe.

[0006] In some embodiments of the invention, the inner heat pipe of the geothermal power generation pipe has vertically oriented heat transfer fins uniformly arranged on the side facing the outer heat pipe. Heat transfer fins are also provided on the side of the outer heat pipe facing the inner heat pipe and on the outer surface of the outer heat pipe to facilitate heat conduction and heat exchange.

[0007] In some embodiments of the invention, a thermoelectric power generation chip is provided between the heat transfer fins of the inner heat pipe and the outer heat pipe of the geothermal power generation pipe, and the heat transfer fins of the inner heat pipe, the heat absorption and dissipation surface of the thermoelectric power generation chip, and the heat transfer fins of the outer heat pipe are arranged in parallel. Conductive groove tracks are provided on both end faces of the thermoelectric power generation chip, and heat-resistant, flame-retardant, insulating, and high-temperature resistant gasket material is provided between the conductive groove tracks and the inner and outer heat pipes of the power generation pipe. The gaps are filled with heat-resistant, flame-retardant, insulating, and high-temperature resistant curing adhesive.

[0008] In some embodiments of the invention, the heat transfer fins of the inner heat pipe, the heat absorption and dissipation surface of the thermoelectric chip, and the heat transfer fins of the outer heat pipe are arranged in parallel, and the heat absorption and dissipation surface of the built-in thermoelectric chip is coated with heat transfer adhesive. The two ends of the geothermal power generation pipe are fastened to the heat transfer fins of the inner and outer heat pipes with plastic screws, tightly bonding and fixing the heat transfer fins of the inner heat pipe, the heat absorption and dissipation surface of the thermoelectric chip, and the heat transfer fins of the outer heat pipe.

[0009] In some embodiments of the invention, the multiple thermoelectric power generation chips are connected in series and then packaged, with the positive and negative terminals of the chip modules connected to the current collector bars. The thermoelectric power generation chip modules on each set of current collector bars are connected in parallel. After multiple sets of current collector bars are connected in parallel, they are connected to the main relay and the control system.

[0010] In some embodiments of the invention, each section of the geothermal power generation pipe has upper and lower ends, each section is 6 meters long, and 5-20 sections constitute a geothermal power generation unit module. The bottom end of the upper section is fixedly connected to the top end of the lower section by threaded rotation and clamping. The top end of the geothermal power generation pipe is fixedly connected to the flange of the insulation material by threaded rotation, and the bottom end of the geothermal power generation pipe is fixedly connected to the lower sealing head of the insulation material by threaded rotation and clamping.

[0011] In some embodiments of the invention, after the air space near the heat transfer fins inside the geothermal power generation pipe is filled with heat-insulating, flame-retardant and waterproof adhesive, after the power transmission wires and information acquisition and transmission lines of each section of the geothermal power generation pipe pass through the wire holes on the heat-insulating fixing plate, they are encapsulated and cured together with heat-insulating and waterproof curing adhesive, and the wires and information acquisition lines are respectively connected to wire connectors.

[0012] The beneficial effects of the embodiments disclosed in this invention are as follows: Utilizing the temperature difference between the Earth's surface environment and geothermal energy, and employing a liquid medium, green hydrogen energy can be produced locally through thermoelectric power generation. In southern China, the surface temperature is generally 18°C ​​higher than the geothermal temperature. Air source heat pumps absorb atmospheric heat and solar energy to raise the temperature of circulating water to 60°C.

[0013] At temperatures as low as -80℃, high-temperature circulating water generates electricity through a temperature difference with geothermal energy. In northern China, where winter temperatures can drop below -20℃, antifreeze is used as the cooling circulating water to generate electricity through a temperature difference with geothermal energy. Geothermal power generation pipes can be buried deep beneath ordinary farmland to generate electricity through geothermal temperature difference, improving the economic and social benefits of rural areas without causing environmental pollution, damaging the ecological environment, or affecting crop growth. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in one or more embodiments of this invention or in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained by modifying these drawings without creative effort.

[0015] Figure 1 The diagram shows a schematic of the geothermal power generation pipe buried deep underground in this embodiment.

[0016] Figure 2 The diagram shows a cross-sectional view of the internal structure of the geothermal power generation pipe.

[0017] Figure 3 The diagram shows a cross-sectional view of the connection between the bottom geothermal pipe and the lower plug of the geothermal power generation pipe. Figure 4 A cross-sectional view of the connection between the geothermal power generation pipes is shown. Figure 5 A cross-sectional view showing the connection between the outer heat-conducting pipe, the inner heat-conducting pipe, and the heat-insulating fixing plate near the head of the geothermal power generation pipe is shown.

[0018] Figure 6 The diagram shows a cross-sectional view of the connections of various components in the geothermal power generation pipe within the cement trough. Figure 7 The image shows a top view of flange 16 on the geothermal power generation pipe. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this specification, and not all embodiments. All other embodiments obtained by those skilled in the art based on one or more embodiments of this specification without creative effort should fall within the protection scope of this document.

[0020] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] At the 2023 World Geothermal Congress, my country released its first national keynote report on geothermal energy, the "Report on High-Quality Development of China's Geothermal Industry," which provided a detailed introduction to the distribution of major geothermal resources, such as shallow, hydrothermal, and hot dry rock types, in various cities and regions of my country.

[0023] Shallow geothermal resources are widely distributed throughout China. Data from the China Geological Survey shows that the thermal capacity of shallow geothermal resources in 336 prefecture-level cities and above in China is 1.11 × 10¹⁷ kJ / ℃, with an annual exploitable amount equivalent to 700 million tons of standard coal. Among these, groundwater-based heat pump systems can provide cooling for 5,590 square kilometers in summer and heating for 3,610 square kilometers in winter; buried pipe-based heat pump systems can provide cooling for 35,600 square kilometers in summer and heating for 37,500 square kilometers in winter. Suitable areas for shallow geothermal development are mainly distributed in central and eastern my country, including 13 provinces and municipalities: Beijing, Tianjin, Hebei, Shandong, Henan, Liaoning, Shanghai, Hubei, Hunan, Jiangsu, Zhejiang, Jiangxi, and Anhui.

[0024] In addition, China is rich in hydrothermal geothermal resources, with 2,334 open-pit hot springs discovered and 5,818 registered geothermal wells. According to the regional geothermal survey results of the China Geological Survey, my country's hydrothermal geothermal resources are equivalent to 1.25 trillion tons of standard coal, with an annual exploitable amount equivalent to 1.865 billion tons of standard coal. Among these, high-temperature hydrothermal geothermal resources are equivalent to 14.1 billion tons of standard coal, with a power generation potential of 8,460 megawatts, mainly distributed in southwestern regions such as Tibet and Yunnan; medium- and low-temperature hydrothermal geothermal resources are mainly distributed in large and medium-sized sedimentary basins and orogenic belts such as the Bohai Bay Basin, the Northern Jiangsu Basin, the Songliao Basin, the Fenwei Graben, and the South China Fold Belt.

[0025] As a renewable energy source, geothermal energy is characterized by its large reserves, stability, reliability, and significant carbon emission reduction effects, and has a wide range of applications. Developing and utilizing geothermal energy in accordance with local conditions helps ensure energy security and promote green and low-carbon development.

[0026] First, traditional geothermal utilization causes environmental damage. Geothermal power generation may have environmental impacts, such as the emission of carbon dioxide, steam containing toxic gases, and harmful substances like heavy metals. Although China possesses approximately one-sixth of the world's geothermal resources, and its direct geothermal utilization scale has long ranked first in the world.

[0027] Although China's geothermal energy industry has reached a certain scale, its development and utilization still face some difficulties and challenges. Whether for direct utilization or geothermal power generation, the core technology for hydrothermal geothermal resources is "heat extraction without water consumption." This involves extracting geothermal water containing heat from a well, absorbing the heat from the water using a heat exchanger, and then reinjecting the cooled water back into the extraction layer through a reinjection well. After a period of time, the underground heat source reheats the cold water, ready for extraction again. Throughout this process, the underground heat source acts like a boiler, continuously heating the groundwater to achieve the cyclical utilization of geothermal energy. This method of geothermal resource extraction requires 100% reinjection of the extracted geothermal water to achieve "extraction-injection balance" and ensure the sustainable use of geothermal resources. Currently, all technical solutions are based on groundwater extraction to obtain geothermal energy. The further north one goes, the more severe the groundwater depletion becomes, seriously affecting people's drinking water and crop growth.

[0028] Secondly, traditional geothermal utilization, especially geothermal power generation technology, is geographically limited. Geothermal power generation requires specific geothermal resources, such as groundwater systems and thermosalinous layers, which makes it applicable only in certain specific areas and is restricted by geological features and surface cover.

[0029] Secondly, extraction is difficult. Geothermal power generation involves high extraction and construction costs, requiring complex equipment such as drilling and installing underground pipelines. The relatively high cost of this equipment hinders commercial development. Thirdly, the location of the supply source is difficult to determine. The precise location of geothermal resources is challenging to calculate, and the stability of the continuous supply is difficult to predict.

[0031] Finally, the initial investment is high. Building a geothermal power plant or heating system requires a large initial investment. Although the operating and maintenance costs are relatively low in the long run, the initial capital requirement may become a limiting factor.

[0032] To address the aforementioned problems in the prior art, this disclosure provides a geothermal power generation pipe, comprising: 1, an inlet pipe; 2, a controller; 3, an outlet pipe; 4, an external heat-conducting pipe for the geothermal pipe; 5, an insulating pad; 6, insulating adhesive material; 7, an insulating pad; 8, an internal heat-conducting pipe for the geothermal pipe; 9, a conductive trough track; 10, a thermoelectric power generation chip; 11, a lower plug; 12, soil; 13, a cement trough; 14, a cement trough cover; 15, an upper plug; 16, a top flange of the geothermal pipe; 17, an inlet area; 18, an outlet area; 19, a PVC quick-connect fitting; 20, a fixing screw; 21, water from the deep well; 22, a clamp; 23, a sealing gasket; 24, sealant; 25, a solenoid valve; 26, a temperature sensor; 29, a heat-insulating fixing plate; 30, a heat-insulating and waterproof curing adhesive; 31, a sealing gasket; and 32, a fixing screw.

[0033] The following detailed technical breakdown is based on each illustration and the disclosed embodiments of the present invention. This breakdown is only for the purpose of facilitating the description of the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0034] Figure 1 The diagram shows a schematic of the geothermal power generation pipe buried deep underground in this embodiment.

[0035] Figure 2 The diagram shows a cross-sectional view of the internal structure of the geothermal power generation pipe.

[0036] Figure 3 The diagram shows a cross-sectional view of the connection between the bottom geothermal pipe and the lower plug of the geothermal power generation pipe. Figure 4 A cross-sectional view of the connection between the geothermal power generation pipes is shown. Figure 5 A cross-sectional view showing the connection between the outer heat-conducting pipe, the inner heat-conducting pipe, and the heat-insulating fixing plate near the head of the geothermal power generation pipe is shown.

[0037] Figure 6 The diagram shows a cross-sectional view of the connections of various components in the geothermal power generation pipe within the cement trough. Figure 7 The image shows a top view of flange 16 on the geothermal power generation pipe.

[0038] To better illustrate the structural principles and operability of deeply buried geothermal power generation pipes, further explanation is provided in conjunction with illustrations:

[0039] Figure 1The diagram illustrates the structure of the geothermal power generation pipe buried deep underground in this embodiment. In this embodiment, we need to determine the location of the geothermal power generation pipe, which is 8-10 meters deep in all directions on a large farmland. Based on the location of the power generation pipe, we optimize the paths of the inlet and outlet water pipes, power transmission lines, and low-voltage control lines by digging a 1.5-meter deep trench. At the location of the power generation pipe, we dig a pit 1.5 meters deep, 2 meters long, and 2 meters wide. Based on the location of the buried geothermal power generation pipe, we drive pile wells. After the pile wells are completed, according to the depth of the pile wells, we connect the sections of the geothermal power generation pipe together, connecting the bottom end with upper and lower plugs 11, and ensuring proper sealing and waterproofing. We then place the cement trough upright, and waterproof the bottom and sides of the cement trough. We place a gasket 23-2 on the top of the geothermal pipe, connect the inlet and outlet water pipes to the top flange 16 of the geothermal pipe, and insert the estimated length of the inlet pipe directly to the bottom of the pipe. After the top of the geothermal pipe is fixed to the flange 16 via threaded connection, a 23-3 waterproof gasket is installed between the flange 16 and the cement trough. Flat-head 20 screws are used to fix the top flange of the geothermal pipe to the cement trough. After the flange 16 is connected and fixed to the geothermal pipe, a cavity is provided in the area between the outer and inner heat-conducting pipes of the geothermal pipe, allowing the wiring inside to be easily pulled out and connected to the controller. Temperature sensors, solenoid valves, and flow controllers are installed on the inlet and outlet pipes of the flange 16. A temperature sensor measuring the geothermal temperature is also installed at the bottom of the pile well. When the temperature difference between the inlet water pipe and the geothermal water is less than the set temperature value, the inlet and outlet pipes are automatically closed to stop temperature difference power generation. Figure 2 Figure 1 shows a cross-sectional view of the internal structure of the geothermal power generation pipe. In this embodiment, the inlet pipe 1 is made of PVC material, with a double-layer PVC pipe interlayer as insulation material, as shown in Figures 1-1, 1-2, and 1-3. 1-1 is the inner PVC pipe fitting, 1-2 is the heat insulation and waterproof material, and 1-3 is the outer PVC pipe fitting. Hot or cold water flows from the core area 17 to the bottom of the geothermal power generation pipe, and then slowly flows upward from the annular area between the inlet pipe and the inner heat-conducting pipe of the geothermal power generation pipe to the top of the geothermal power generation pipe, flowing into the outer main return pipe through the outlet pipe. A thermoelectric power generation chip 10 is provided between the inner heat-conducting pipe 8 and the outer heat-conducting pipe 4 of the geothermal pipe. The heat transfer and heat dissipation fins of the inner heat-conducting pipe 8 and the outer heat-conducting pipe 4 are tightly attached to the hot and cold sides of the thermoelectric power generation chip 10. Each thermoelectric chip 10 has a conductive groove track 9 on its side end face. Multiple thermoelectric chips are connected in series and then packaged together. The side end face has an electrode post. During installation, the chip module only needs to be gently pushed into a set of conductive groove tracks 9. The conductive groove track 9 is installed and fixed in the grooves on the insulating pad 5. The insulating pad 5 is made of flame-retardant, heat-resistant, and high-temperature resistant insulating material. The heat transfer fan fins on the inner heat pipe 8 and outer heat pipe 4 of the geothermal pipe are tightened with insulating screws, so that the hot and cold sides of the thermoelectric chip 10 are coated with thermally conductive adhesive and pressed together by the heat transfer fan fins. The gap area 6 is filled with insulating, flame-retardant, and heat-resistant adhesive and cured.

[0040] Figure 3 A cross-sectional view of the connection between the bottom geothermal pipe and the lower plug is shown. This embodiment mainly discloses the assembly and connection of sections of geothermal power generation pipe with the lower plug 11. Each section of geothermal power generation pipe is encapsulated and waterproofed, facilitating connection with other geothermal power generation pipes, lower plugs, and upper plug flanges. Figure 3 The diagram illustrates that before installing the geothermal power generation pipe and the lower plug 11, the waterproof gasket 23-2 should be placed first. After wrapping the threads with waterproof tape, the lower plug should be tightened by rotation. Waterproof adhesive should be applied to the joint, and the joint should be secured with a clamp containing a sealing waterproof gasket. It should be noted that the outer heat-conducting pipe 4 and the inner heat-conducting pipe 8 of the geothermal power generation pipe are made of aluminum alloy 5083, manufactured using a hot extrusion process. The lower plug is made of a heat-resistant and corrosion-resistant material, such as plastic or ceramic.

[0041] Figure 4 A cross-sectional view of the connection between the geothermal power generation pipes is shown. This embodiment... Figure 4 The main illustration shows the installation diagram of the interconnection of sections of geothermal power generation pipes. Each section of geothermal power generation pipe is divided into upper and lower parts, marked during manufacturing for easy identification. Each section is 6 meters long, and 5-20 sections constitute a geothermal power generation unit module. The bottom end of one section is threadedly connected to the top end of the next section. Before connection, a waterproof gasket is placed, and the connecting power transmission line and data acquisition transmission line are placed in the opposite direction of the thread rotation. After wrapping waterproof tape around the threads, the connection is directly rotated into place. Waterproof adhesive is applied to the joint, and then clamps with sealing waterproof gaskets are used to tighten it.

[0042] Figure 5 A cross-sectional view of the connection between the outer heat-conducting pipe 4, the inner heat-conducting pipe 8, and the heat-insulating fixing plate 29 near the head of the geothermal power generation pipe is shown. In this embodiment, the inner heat-conducting pipe 8 and the heat transfer fan fins on the outer heat-conducting pipe 4 are tightened with insulating screws, so that the hot and cold sides of the thermoelectric chip 10 are coated with thermally conductive adhesive and pressed together by the heat transfer fan fins. After the gap area 6 is filled with insulating, flame-retardant, and heat-insulating adhesive, each set of conductive groove tracks in each section of the geothermal power generation pipe needs to be connected in parallel to lead out positive and negative wires, and the other end of the wires is connected to the wire connector 31. Data acquisition and transmission lines are required for each geothermal power generation pipe, which are run through the empty area 6 of the geothermal power generation pipe. The main purpose is to collect parameters such as voltage, current, and thermal efficiency of the electricity generated by each geothermal power generation pipe. In this embodiment, after the power transmission lines and information acquisition lines pass through the wire holes on the heat-insulating fixing plate 29, they are encapsulated and cured together with heat-insulating and waterproof adhesive. The power transmission lines and information acquisition lines are then connected to the wire connectors 31. Connecting the geothermal power generation pipes to each other only requires inserting the male and female slots of the wire connectors 31 together.

[0043] Figure 6 The diagram shows a cross-sectional view of the connection between the cement tank cover plate 14 at the upper end of the geothermal power generation pipe, the flange 16 at the top of the geothermal pipe, the upper sealing plug 15, the water outlet pipe 3, the PVC quick connector 19, the controller 2, the solenoid valve 25, and the temperature sensor 26. In this embodiment, [the connection is made by...]. Figure 6 It can be seen that we need to determine the location of the geothermal power generation pipes, which need to be buried 8-10 meters deep in all directions on a large area of ​​farmland. Based on the location of the power generation pipes, we will optimize the routes of the inlet and outlet water pipes, power transmission lines, and low-voltage control lines by digging a 1.5-meter deep trench. At the location of the power generation pipes, we will dig a pit 1.5 meters deep, 2 meters long, and 2 meters wide. Based on the location of the buried geothermal power generation pipes, we will drive pile wells. After the pile wells are completed, according to the depth of the pile wells, we will connect the sections of geothermal power generation pipes together, connecting the bottom end with upper and lower plugs (11), and ensuring proper sealing and waterproofing. We will then place the cement trough upright, and ensure proper waterproofing at the bottom and around the edges. We will place gaskets (23-2) on the top of the geothermal pipes, connect the inlet and outlet water pipes to the top flanges (16), and insert the pre-calculated inlet pipe to the bottom of the pipe. After the top of the geothermal pipe is fixed to the flange 16 via threaded connection, a 23-3 waterproof gasket is installed between the flange 16 and the cement trough. Flat-head 20 screws are used to fix the top flange of the geothermal pipe to the cement trough. After the flange 16 is connected and fixed to the geothermal pipe, holes are provided in the area between the outer and inner heat-conducting pipes of the geothermal pipe, allowing the wiring inside to be easily pulled out and connected to the controller. Temperature sensors, solenoid valves, and flow controllers are installed on the inlet and outlet pipes of the flange 16. A temperature sensor measuring the geothermal temperature is also installed at the bottom of the pile well. When the temperature difference between the inlet water pipe and the geothermal water is less than the set temperature value, the inlet and outlet pipes are automatically closed to stop temperature difference power generation.

[0044] Figure 7 A top view of flange 16 on the geothermal power generation pipe is shown. In this embodiment, flat-head screw holes are distributed around flange 16, and holes are provided in the area between the outer heat conduction pipe and the inner heat conduction pipe of the geothermal pipe.

[0045] China's arable land area red line is 1.8 billion mu. These 1.8 billion mu of arable land cannot increase farmers' income by simply developing agriculture through crops or cash crops. If geothermal power generation is achieved by using deep-buried geothermal pipes 1.5 meters below the surface of arable land, our country can achieve clean energy development without damaging the environment and agricultural production, and completely get rid of dependence on fossil fuels. At the same time, it can increase farmers' income and take a path of "innovating rural development models, improving farmers' income levels, and promoting the comprehensive development of rural economy and society". In actual implementation, this invention mainly utilizes shallow geothermal resources, without damaging rural ecological resources, without affecting crop growth and farmers' income. On the contrary, the technology of using deep-buried geothermal power generation pipes in farmland can bring continuous and stable income to the rural collective economy to improve farmers' living standards. In this embodiment, there are three energy exchange power generation modes: (1) The southern mode uses external hot water and geothermal 18℃ warm water for heat exchange power generation, which is a reverse power generation. (2) The northern mode uses external cold water and geothermal 18℃ warm water for heat exchange power generation, which is a forward power generation. (3) Hybrid mode: Most areas in Central China need to adopt hybrid power generation mode. In summer, hot water enters the deep buried geothermal power generation pipe to generate electricity in reverse, and the forward power generation chip does not work. In winter, cold water enters the deep buried geothermal power generation pipe to generate electricity in the forward, and the reverse power generation chip does not work.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A geothermal power generation pipe, characterized in that, include: The system consists of an inlet pipe, controller, outlet pipe, external heat-conducting pipe for geothermal heating, insulating pad, insulating adhesive material, internal heat-conducting pipe for geothermal heating, conductive trough track, thermoelectric generator chip, lower plug, soil, cement trough, cement trough cover, upper plug, top flange of geothermal pipe, inlet area, outlet area, PVC quick-connect fitting, fixing screws, water from deep well, clamps, sealing gaskets, sealant, solenoid valve, temperature sensor, heat-insulating fixing plate, heat-insulating and waterproof curing adhesive, sealing gaskets, fixing screws, etc.

2. The geothermal power generation pipe according to claim 1, characterized in that, The double-layered insulated water pipe is made of double-layered plastic pipe with an inner insulation material. The inlet insulated pipe connects to the external main water supply pipe, passes through a cement trench sleeve, is sealed at the top with a capping sleeve, and then, after passing through a solenoid valve and temperature sensor, directly connects to the double-layered insulated water pipe at the center of the geothermal power generation pipe flange, reaching the bottom of the geothermal power generation pipe. The return water flows upward along the wall seam of the heat exchange inner pipe and the inlet insulated pipe, directly onto the insulated pipe flange, and connects to the return water pipe, which is connected to the main return water pipe.

3. A geothermal power generation pipe according to claim 1, characterized in that, The inner heat pipe of the geothermal power generation pipe has vertically oriented heat transfer fins evenly distributed on the side facing the outer heat pipe. Heat transfer fins are also provided on the side of the outer heat pipe facing the inner heat pipe and on the outer surface of the outer heat pipe to facilitate heat conduction and exchange.

4. A geothermal power generation pipe according to claim 1, characterized in that, A thermoelectric generator chip is installed between the heat transfer fins of the inner and outer heat transfer pipes of the geothermal power generation pipe. The heat transfer fins of the inner heat pipe, the heat absorption and dissipation surfaces of the thermoelectric generator chip, and the heat transfer fins of the outer heat pipe are arranged in parallel. Conductive groove tracks are provided on both end faces of the thermoelectric generator chip. Heat-resistant, flame-retardant, insulating, and high-temperature resistant gasket strips are placed between the conductive groove tracks and the inner and outer heat transfer pipes of the power generation pipe. The gaps are filled with heat-resistant, flame-retardant, insulating, and high-temperature resistant curing adhesive.

5. A geothermal power generation pipe according to claim 4, characterized in that, The heat transfer fins of the inner heat pipe, the heat absorption and dissipation surfaces of the thermoelectric chip, and the heat transfer fins of the outer heat pipe are arranged in parallel. The heat absorption and dissipation surfaces of the built-in thermoelectric chip are all coated with heat transfer adhesive. The two ends of the geothermal power generation pipe are fastened to the heat transfer fins of the inner and outer heat pipes with plastic screws, so that the heat transfer fins of the inner heat pipe, the heat absorption and dissipation surfaces of the thermoelectric chip, and the heat transfer fins of the outer heat pipe are tightly attached and fixed.

6. A geothermal power generation pipe according to claim 1, characterized in that, Multiple thermoelectric generator chips are connected in series and then packaged. The positive and negative terminals of the chip module are connected to the current collector. The thermoelectric generator chip modules on each current collector are connected in parallel. After multiple current collectors are connected in parallel, they are connected to the main relay and the control system.

7. A geothermal power generation pipe according to claim 1, characterized in that, Each section of the geothermal power generation pipe has upper and lower ends, and each section is 6 meters long. 5-20 sections constitute a geothermal power generation unit module. The bottom end of one section is fixedly connected to the top end of the next section using threaded rotation and clamps. The top end of the geothermal power generation pipe is fixedly connected to the insulation material flange using threaded rotation, and the bottom end of the geothermal power generation pipe is fixedly connected to the lower sealing head of the insulation material using threaded rotation and clamps.

8. A geothermal power generation pipe according to claim 1, characterized in that, After the airspace near the heat transfer fins inside the geothermal power generation pipe is filled with heat-insulating, flame-retardant, and waterproof adhesive, the power transmission wires and information acquisition and transmission lines of each section of the geothermal power generation pipe pass through the wire holes on the heat-insulating fixing plate. Then, heat-insulating and waterproof curing adhesive is used to seal and cure the wires together. The wires and information acquisition lines are then connected to wire connectors.

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