Geothermal buried pipe utilization system coupled with green energy for heat collection and heat compensation

Abstract

The utility model belongs to the technical field of green energy, and discloses a geothermal buried pipe utilization system coupling green energy heat collection and heat compensation, which comprises an energy compensation device, a heat compensation geothermal well, a geothermal buried pipe and an AI auxiliary regulation and control system, and the energy compensation device comprises a solar heat collector and an electric energy heater; the energy complementing device is connected with the heat complementing geothermal well through a transmission pipeline; the underground part of the transmission pipeline axially penetrates through the heat compensation geothermal well; the underground part of the terrestrial heat buried pipe is located in a heat compensation target stratum, and the overground part is connected with a user side; the AI auxiliary regulation and control system comprises a power grid data acquisition module, the power grid data acquisition module is connected into a power grid through an intelligent electric meter, and the AI auxiliary regulation and control system is further in signal connection with an energy complementation device, a circulating pump, a pressure pump and a user side. According to the terrestrial heat buried pipe utilization system, a multi-element heat compensation mode is adopted, the problem of single energy dependence is solved, the heat compensation proportion of solar energy and electric energy can be intelligently distributed based on weather and power grid data, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of green energy technology, and in particular relates to a geothermal buried pipe utilization system that couples green energy heat collection and heat replenishment. Background Technology

[0002] Ground source heat pump systems with buried pipes have gained widespread attention and application in recent years as a highly efficient heating and cooling method. However, they face some inherent challenges in practical applications, particularly regarding the sustainable utilization of underground soil and rock heat. The heat reserves in underground soil and rock are limited, and during continuous operation, the heat within them gradually decreases or increases, leading to a decline in the efficiency or instability of the heat pump system. Traditional ground source heat pump systems achieve heat exchange through buried pipes, but long-term operation can easily cause thermal imbalance in the underground soil and rock, resulting in a decrease in system energy efficiency. Existing inter-seasonal heat storage systems mostly use solar collector modules to circulate and heat the medium. The medium indirectly exchanges heat with the soil and rock in the pipes, and then the heat is indirectly extracted from the soil and rock through a heat pump. Relying solely on seasonal solar energy storage results in low system flexibility, an inability to replenish heat at night, and a weakening of the underground soil and rock thermal field. Furthermore, the heat exchange efficiency between the medium and the soil and rock is low.

[0003] Given the above background, it is necessary to propose a geothermal buried pipe utilization system that couples green energy for heat collection and supplementation. This system integrates multiple energy conversions for heat supplementation, including solar energy, off-peak electricity, curtailed solar power, and curtailed wind power, to achieve efficient and synergistic utilization of geothermal energy and green energy, providing new ideas and methods for the development and utilization of renewable energy. Utility Model Content

[0004] Traditional buried-pipe ground source heat pump systems, operating on a large scale and with centralized heat extraction over long periods, are prone to causing thermal imbalances in the underground soil and rock. The heat extraction rate far exceeds the natural replenishment capacity, forming a low-temperature core zone that spreads to the surrounding areas. This imbalance between heat extraction and replenishment leads to a continuous decrease in soil and rock temperature, resulting in system energy efficiency degradation and a cold accumulation effect. Long-term cold accumulation induces underground soil and rock shrinkage, with localized ground subsidence reaching 5-10 mm / year, thus requiring additional energy input to maintain heating demand. Traditional heat replenishment technologies rely on seasonal solar energy storage, which suffers from insufficient energy synergy and limited heat replenishment efficiency. The purpose of this application is to provide a geothermal buried-pipe utilization system that couples green energy collection and heat replenishment. In addition to solar energy, it is compatible with electricity as a supplementary energy source. Through multi-source coordinated geothermal heat replenishment and AI-assisted regulation, it achieves efficient and synergistic utilization of geothermal energy and green energy, providing new ideas and methods for the development and utilization of renewable energy.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A geothermal buried pipe utilization system coupled with green energy heat collection and replenishment includes an energy replenishment device, a replenishment geothermal well, geothermal buried pipes, and an AI-assisted control system.

[0007] Energy collection devices include solar collectors and electric heaters;

[0008] The energy collection device is connected to the geothermal well via a transmission pipeline, and a booster pump is installed on the above-ground part of the transmission pipeline.

[0009] The underground portion of the transmission pipeline axially penetrates the geothermal well for replenishing heat, and is used to transport water heated by the energy replenishment device to the target formation through the geothermal well.

[0010] The underground portion of the geothermal pipe is located in the target stratum for heat replenishment, while the above-ground portion is connected to the user end;

[0011] The above-ground portion of the geothermal buried pipe is equipped with a circulation pump to drive the heat-carrying medium to circulate within the geothermal buried pipe.

[0012] The AI-assisted control system includes a power grid data acquisition module, which is connected to the power grid through a smart meter. The AI-assisted control system is also connected to an energy replenishment device, a circulating pump, a booster pump, and user-end signals.

[0013] Furthermore, the electric heater is connected to the power grid, wind power generation units, and solar power generation units.

[0014] Furthermore, the pipe wall of the transmission pipeline includes an inner layer and an outer layer, with the inner layer being a stainless steel layer and the outer layer being a polyurethane insulation layer.

[0015] Furthermore, a seepage device is connected to one end of the transmission pipeline near the bottom of the geothermal well.

[0016] Furthermore, the seepage device includes a pipe with a porous media layer as the pipe wall, and the porous media layer is wrapped with a heat insulation layer.

[0017] One end of the pipe, whose wall is a porous media layer, is connected to the outlet end of the transmission pipe, and the other end is sealed.

[0018] Furthermore, the porous dielectric layer is made of porous silicon carbide ceramic.

[0019] Furthermore, the insulation layer is made of nano-aerogel.

[0020] Furthermore, the inner wall of the geothermal well is lined with cementing material.

[0021] Furthermore, the cementing material is a silicon nitride composite material.

[0022] Furthermore, multiple temperature sensors are arranged in layers according to depth around the geothermal well and the geothermal buried pipe.

[0023] A light intensity sensor is installed on the surface of the solar collector plate;

[0024] Pressure and flow sensors are installed at both the inlet and outlet of the booster pump;

[0025] Temperature sensor, light intensity sensor, and pressure / flow sensor are respectively connected to the AI-assisted control system.

[0026] Furthermore, the depth of the geothermal wells for heat replenishment is 200-2000 meters.

[0027] The technical effects and advantages of this application are as follows:

[0028] 1. The geothermal buried pipe utilization system of this application adopts a multi-energy supplementation mode, integrating multiple energy inputs such as solar energy, off-peak electricity, curtailed solar power, and curtailed wind power, which solves the problem of dependence on a single energy source and ensures that the system operates efficiently and stably throughout the year.

[0029] 2. This application incorporates an AI-assisted control system into the system, which can intelligently allocate the ratio of solar and electrical energy supplementation based on meteorological and power grid data, and achieve real-time supplementation and dynamic balance of underground rock and soil thermal energy through green energy such as solar energy, off-peak electricity, wind power, or solar power.

[0030] 3. The system of this application utilizes underground seepage to accelerate heat diffusion and improve the temperature of the soil and rock around the buried heat pipe, which is conducive to increasing the heat storage density and heat extraction efficiency.

[0031] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a geothermal buried pipe utilization system coupled with green energy heat collection and supplementation according to an embodiment of this application;

[0033] Reference numerals: 1. Energy replenishment device; 2. Geothermal well for heat replenishment; 3. Geothermal buried pipe; 4. AI-assisted control system; 5. Transmission pipeline; 6. Circulation pump; 7. Booster pump; 8. Seepage device. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] like Figure 1As shown, to address the shortcomings of existing technologies, this application discloses a geothermal buried pipe utilization system coupled with green energy heat collection and replenishment. The system includes an energy collection device 1, a geothermal well 2, a geothermal buried pipe 3, and an AI-assisted control system 4. The energy collection device 1 includes a solar collector and an electric heater. The energy collection device 1 is connected to the geothermal well 2 via a transmission pipe 5. The transmission pipe 5 has a double-wall structure; the inner layer is made of high-temperature and corrosion-resistant 316L stainless steel (temperature resistance ≥300℃), and the outer layer is a polyurethane insulation layer (thermal conductivity ≤0.03W / (m·K)), which effectively reduces heat dissipation. A pressure pump 7 is installed on the above-ground portion of the transmission pipe 5, and the underground portion of the transmission pipe 5 axially penetrates the geothermal well 2, used to transport water heated by the energy collection device 1 through the geothermal well 2 to the target geothermal layer at a depth of 200-2000 meters, thus achieving geothermal replenishment. The wellhead of the geothermal well 2 is connected to the transmission pipe 5 via a sealed joint. The underground portion of the geothermal buried pipe 3 is located in the target stratum for heat replenishment, while the above-ground portion connects to the user end. The above-ground portion of the geothermal buried pipe 3 is equipped with a circulation pump 6, which drives the heat-carrying medium to circulate within the geothermal buried pipe 3. The AI-assisted control system 4 includes a power grid data acquisition module, which is connected to the power grid via a smart meter. The AI-assisted control system 4 is also connected to the energy replenishment device 1, the circulation pump 6, the booster pump 7, and the user end signal.

[0036] The geothermal buried pipe utilization system of this application adopts a multi-energy supplementation mode. In addition to solar energy, it is compatible with electrical energy as a supplementary energy source, which solves the problem of dependence on a single energy source. Furthermore, an AI-assisted control system is added to the system, which can intelligently allocate the ratio of solar energy to electrical energy supplementation based on meteorological and power grid data, thereby improving the system's operational stability, reducing operating costs, and increasing energy utilization efficiency.

[0037] In some embodiments of this application, the electric heater is connected to the power grid, wind power generation equipment, and solar power generation equipment to achieve the effective utilization of green energy.

[0038] In some embodiments of this application, the end of the transmission pipeline 5 near the bottom of the geothermal well 2 is connected to a seepage device 8. The distance between the seepage device 8 and the geothermal buried pipe 3 is 45-55 meters. The seepage device 8 includes a pipe with a porous media layer as its wall, and an insulation layer wrapped around the porous media layer. The porous media layer is made of porous silicon carbide ceramic with a porosity of 30%-50% and a pore size of 0.5-2 mm. The insulation layer is made of nano-aerogel with a thickness of 10 mm and a thermal conductivity ≤0.02 W / (m·K). One end of the pipe with the porous media layer is connected to the outlet end of the transmission pipeline 5, and the other end is sealed. The bottom of the geothermal well 2 is connected to the seepage device 8 through a flange. The seepage device 8, in conjunction with the pressurization pump 7, can control the range of hot fluid penetration, utilize underground seepage for heat replenishment, and form a thermal convection circulation with the geothermal well 2 to heat the surrounding soil and rock of the geothermal buried pipe 3, significantly improving the underground soil and rock heat replenishment rate.

[0039] In some embodiments of this application, the inner wall of the geothermal well 2 is lined with cementing material, which has a thermal conductivity ≥50W / (m·K) and a density ≤1.5g / cm³. 3 The silicon nitride composite material, which uses a cementing material with high thermal conductivity and low density, is conducive to the formation of a heat flow directional guiding layer and reduces the diffusion of heat to non-target formations during the reheating process.

[0040] In some embodiments of this application, multiple temperature sensors (distributed fiber optic temperature sensors may be selected) are arranged in layers around the geothermal well 2 and the geothermal buried pipe 3. A light intensity sensor is provided on the surface of the solar collector plate. Pressure and flow sensors are provided at the inlet and outlet of the pressurization pump 7. The temperature sensors, light intensity sensor and pressure and flow sensors are respectively connected to the AI-assisted control system 4.

[0041] In conjunction with the aforementioned sensors, the AI-assisted control system 4 employs a fuzzy control algorithm to dynamically match the optimal operating parameters of equipment such as the energy replenishment device 1, the booster pump 7, and the circulating pump 6, ensuring system efficiency and stability. Combining a thermodynamic model with a PID controller (proportional-integral-derivative controller), it adjusts the mass flow rate, pressure, and temperature gradient of the heat-carrying medium in real time to maximize heat transfer efficiency. A genetic algorithm is used to solve for the Pareto optimal solution of energy efficiency, cost, and carbon emissions, dynamically allocating the heat replenishment ratio of solar energy, off-peak electricity, and curtailed wind and solar power generation. By monitoring factors such as underground soil and rock temperature and solar irradiance in real time, the AI-assisted control system 4 can dynamically switch heat replenishment energy modes (e.g., using solar energy during the day and off-peak electricity at night) to optimize system energy efficiency and operating costs.

[0042] The working principle of the system in this application is as follows:

[0043] The heat collection and supplementary heat geothermal well 2 transmission stage: The energy collection device 1 absorbs and converts solar energy into heat energy, or heats water by using off-peak electricity, abandoned wind and solar power, etc., so that the water temperature is raised, and then it is transported to the transmission pipe 5 in the supplementary heat geothermal well 2. The hot water is transported to the seepage device 8 through the transmission pipe 5 and diffused into the rock and soil.

[0044] Underground seepage enhancement and heat replenishment stage: Under the action of the pressurization pump 7, hot water diffuses unidirectionally from the porous medium pipe of the seepage device 8 towards the soil and rock, forming a directional heat flow, which heats and replenishes the soil and rock around the geothermal buried pipe 3, shortens the heat transfer path, improves the underground soil and rock heat replenishment efficiency, improves the heat storage around the geothermal buried pipe 3, and thus improves the energy utilization efficiency of the geothermal buried pipe 3.

[0045] Geothermal buried pipe heat transfer stage: The temperature of the surrounding soil and rock of the geothermal buried pipe 3 is improved due to the supplemental heating, which is conducive to heating the heat-carrying medium in the geothermal buried pipe 3. The heat-carrying medium transfers the heat energy to the user end through the heat pump system for heating, power generation or other heat energy utilization. The circulating pump 6 drives the heat-carrying medium to circulate in the geothermal buried pipe and the working system, forming a closed loop circulation.

[0046] The AI-assisted control system 4 monitors and adjusts the operating parameters of each component in real time to ensure stable operation and optimal efficiency. Based on monitoring data from the irradiance sensor, when there is sufficient sunshine, the solar collector heats the water to 130-160℃. At night or during periods of low irradiance, the AI-assisted control system can prioritize using off-peak electricity or curtailed wind and solar power to power the electric heater, maintaining a water temperature ≥65℃. When cold water enters the energy replenishment device 1, the AI-assisted control system 4 dynamically optimizes the heating strategy by combining soil and rock temperature field data. The AI-assisted control system 4 can also perform fault alarms and remote monitoring, improving the system's reliability and safety.

[0047] Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A geothermal buried pipe utilization system coupled with green energy heat collection and supplementation, characterized in that, It includes an energy replenishment device (1), a geothermal well (2), geothermal buried pipes (3), and an AI-assisted control system (4). The energy collection device (1) includes a solar collector and an electric heater; The energy collection device (1) is connected to the geothermal well (2) via a transmission pipeline (5), and a booster pump (7) is installed on the above-ground part of the transmission pipeline (5). The underground portion of the transmission pipeline (5) axially penetrates the geothermal well (2) and is used to transport the water heated by the energy collection device (1) through the geothermal well (2) to the target geothermal formation. The underground portion of the geothermal buried pipe (3) is located in the target heating stratum, and the above-ground portion is connected to the user end; The above-ground portion of the geothermal buried pipe (3) is equipped with a circulation pump (6) for driving the heat-carrying medium to circulate in the geothermal buried pipe (3); The AI-assisted control system (4) includes a power grid data acquisition module, which is connected to the power grid through a smart meter. The AI-assisted control system (4) is also connected to an energy replenishment device (1), a circulation pump (6), a booster pump (7), and a user terminal signal.

2. The geothermal buried pipe utilization system coupled with green energy heat collection and supplementation according to claim 1, characterized in that, The electric heater is connected to the power grid, the wind power generation unit, and the solar power generation unit.

3. The geothermal buried pipe utilization system coupled with green energy heat collection and supplementation according to claim 1, characterized in that, The wall of the transmission pipe (5) includes an inner layer and an outer layer, wherein the inner layer is a stainless steel layer and the outer layer is a polyurethane insulation layer.

4. A geothermal buried pipe utilization system coupled with green energy heat collection and supplementation according to claim 1, characterized in that, The transmission pipeline (5) is connected to a seepage device (8) at one end near the bottom of the geothermal well (2).

5. A geothermal buried pipe utilization system coupled with green energy heat collection and supplementation according to claim 4, characterized in that, The seepage device (8) includes a pipe with a porous medium layer as the pipe wall, and the porous medium layer is wrapped with a heat insulation layer. One end of the pipe, whose wall is a porous medium layer, is connected to the outlet end of the transmission pipe (5), and the other end is sealed.

6. A geothermal buried pipe utilization system coupled with green energy heat collection and supplementation according to claim 5, characterized in that, The porous dielectric layer is made of porous silicon carbide ceramic.

7. A geothermal buried pipe utilization system coupled with green energy heat collection and supplementation according to claim 5, characterized in that, The material of the heat insulation layer is nano-aerogel.

8. A geothermal buried pipe utilization system coupled with green energy heat collection and supplementation according to claim 1, characterized in that, The inner wall of the geothermal well (2) is covered with cementing material, which is silicon nitride composite material.

9. A geothermal buried pipe utilization system coupled with green energy heat collection and supplementation according to claim 1, characterized in that, Multiple temperature sensors are arranged in layers at different depths around the geothermal well (2) and the geothermal buried pipe (3). A light intensity sensor is installed on the surface of the solar collector plate; Pressure and flow sensors are installed at both the inlet and outlet of the pressurizing pump (7); The temperature sensor, the light intensity sensor, and the pressure and flow sensor are respectively connected to the AI-assisted control system (4) via signal connection.

10. A geothermal buried pipe utilization system coupled with green energy heat collection and supplementation according to claim 1, characterized in that, The depth of the geothermal well (2) is 200-2000 meters.

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