Geothermal energy vertical heat conduction system
Patent Information
- Application Number
- CN202521975907.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-14
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-09-14
AI Technical Summary
[0003]但是，在实际使用中，将高温循环水回抽至地表，需要较大的能耗，而且对于深层的热源（3000米），回抽高温循环水，需要大扬程水泵，成本较高，因此，衍生出通过蒸汽换热的方式，即将液体的换热介质注入地下，与地下热源换热，使换热介质汽化，汽化后的换热介质回抽至地表，与地上的负载装置换热，减少对大扬程泵的依赖，但是，系统在运行时存在，地下换热组件内换热介质液态向气态转换较慢，即能够携带热量，并被回抽至地表的高温气态换热介质较少，进而造成系统整体地热采集效率不高，即造成地上的负载装置无法输出有效的热能
[0023]通过真空泵组件工作，使介质循环回路和/或地下换热组件内呈负压，降低其内部换热介质的沸点，进而使换热介质在吸收更少的热量即可以由液态转换为气态，以蒸汽的形式通过导汽通道被回抽到地上换热组件，通过增加汽化的换热介质量，使地下热源与地上负载模块之间流通更多的热传导载体，进而提升地热的采集效率，增加地上负载装置的有效输出热能。
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Figure CN224872658U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of geothermal application technology, and more specifically, to a geothermal energy vertical heat conduction system. Background Technology
[0002] Geothermal systems collect underground heat and transfer it to the surface through a circulating heat exchange medium for use by load devices on the construction site. In existing technologies, the heat exchange medium is mostly water injection heat exchange, which involves injecting low-temperature circulating water underground to exchange heat with underground heat sources. Then, a water pump pumps the high-temperature circulating water from underground to the surface to exchange heat with load devices on the ground, thereby realizing the utilization of underground heat.
[0003] However, in practical use, pumping high-temperature circulating water back to the surface requires significant energy consumption. Moreover, for deep heat sources (3000 meters), pumping back high-temperature circulating water requires high-lift pumps, resulting in high costs. Therefore, a method of steam heat exchange has emerged, in which liquid heat exchange medium is injected underground to exchange heat with the underground heat source, causing the heat exchange medium to vaporize. The vaporized heat exchange medium is then pumped back to the surface to exchange heat with the load device on the ground, reducing the dependence on high-lift pumps. However, during system operation, the conversion of the heat exchange medium from liquid to gaseous state in the underground heat exchange components is slow, meaning that less high-temperature gaseous heat exchange medium can carry heat and be pumped back to the surface. This results in low overall geothermal collection efficiency of the system, meaning that the load device on the ground cannot output effective heat energy.
[0004] In summary, how to solve the problem of low efficiency in the conversion of liquid heat exchange medium from liquid to gas in underground heat exchange components, resulting in low overall geothermal collection efficiency of the system, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0005] In view of this, the purpose of this utility model is to provide a geothermal vertical heat conduction system, which reduces the pressure in the medium circulation loop and / or underground heat exchange components by using a vacuum pump assembly, thereby lowering the boiling point of the heat exchange medium, accelerating the change of the heat exchange medium from liquid to gas, and then carrying heat to float to the surface through the steam conduction channel, thereby improving the efficiency of geothermal energy collection.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A geothermal vertical heat conduction system, comprising:
[0008] The medium circulation loop includes a closed-loop steam guide channel, an underground heat exchange component, a liquid injection channel, and an above-ground heat exchange component connected in series. The medium circulation loop is filled with a heat exchange medium. The underground heat exchange component is used to exchange heat with underground thermal energy, and the above-ground heat exchange component is used to exchange heat with the above-ground load module.
[0009] A vacuum pump assembly, which is connected to the medium circulation loop, is used to create negative pressure within the underground heat exchange assembly.
[0010] Preferably, the steam guide channel is arranged vertically and connected in series with several fan assemblies to drive the steam in the steam guide channel to float upward.
[0011] Preferably, the geothermal vertical heat conduction system further includes an equipment maintenance compartment, in which the fan assembly is disposed;
[0012] The fan assembly and the steam guide channel are detachable and installable.
[0013] Preferably, the steam guide channel is provided with an insulation layer to reduce heat loss from the channel.
[0014] Preferably, the injection channel is arranged vertically and connected in series with a downward-conducting one-way valve assembly;
[0015] The upper inlet of the injection channel is connected to the lowest point of the ground heat exchange assembly.
[0016] Preferably, the geothermal vertical heat conduction system further includes a heating component for direct heating of the heat transfer medium within the above-ground load module.
[0017] Preferably, the underground heat exchange assembly includes heat exchange tubes made of a material with high thermal conductivity;
[0018] And / or, the underground heat exchange assembly and / or the above-ground heat exchange assembly includes several sets of heat-conducting fins for improving heat exchange efficiency.
[0019] Preferably, the geothermal vertical heat conduction system further includes a pressure transmitter and / or a temperature transmitter.
[0020] The pressure transmitter is used to acquire pressure data within the medium circulation loop and / or the underground heat exchange assembly.
[0021] The temperature transmitter is used to acquire the temperature data of the heat transfer medium inside the ground load module.
[0022] The geothermal vertical heat conduction system provided by this utility model has at least the following advantages compared with the prior art:
[0023] By operating the vacuum pump assembly, a negative pressure is created in the medium circulation loop and / or the underground heat exchange assembly, lowering the boiling point of the internal heat exchange medium. This allows the heat exchange medium to convert from a liquid to a gaseous state with less heat absorption, and then be drawn back to the above-ground heat exchange assembly as steam through the steam channel. By increasing the amount of vaporized heat exchange medium, more heat transfer medium flows between the underground heat source and the above-ground load module, thereby improving the efficiency of geothermal energy collection and increasing the effective output heat energy of the above-ground load device. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the geothermal vertical heat conduction system provided by this utility model;
[0026] Figure 2 This is a schematic diagram of the structure of a specific embodiment of the geothermal vertical heat conduction system provided by this utility model.
[0027] In the picture:
[0028] 1. Steam guide channel; 2. Underground heat exchange assembly; 3. Liquid injection channel; 4. Above-ground heat exchange assembly; 5. Heating assembly; 6. Fan assembly; 7. Vacuum pump assembly; 8. Check valve assembly; 9. Pressure transmitter assembly; 10. Temperature transmitter assembly. Detailed Implementation
[0029] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] The core of this invention is to provide a geothermal vertical heat conduction system. By reducing the pressure in the medium circulation loop and / or underground heat exchange components through a vacuum pump assembly, the boiling point of the heat exchange medium is lowered, accelerating the change of the heat exchange medium from liquid to gas, and then carrying heat to float to the surface through the steam conduction channel, thereby improving the efficiency of geothermal energy collection.
[0031] Please refer to Figure 1 and Figure 2 A geothermal vertical heat conduction system, comprising:
[0032] The medium circulation loop includes a closed-loop steam guide channel 1, an underground heat exchange component 2, a liquid injection channel 3, and an above-ground heat exchange component 4 connected in series. The medium circulation loop is filled with a heat exchange medium. The underground heat exchange component 2 is used to exchange heat with underground thermal energy, and the above-ground heat exchange component 4 is used to exchange heat with the above-ground load module.
[0033] The vacuum pump assembly 7 is connected to the medium circulation loop and is used to create negative pressure within the underground heat exchange assembly 2.
[0034] like Figure 1 and Figure 2 As shown, the steam guiding channel 1, the underground heat exchange component 2, the liquid injection channel 3, and the above-ground heat exchange component 4 are connected in series to form a closed loop. The underground heat exchange component 2 is located at the underground heat source and exchanges heat with the underground heat source, causing the heat exchange medium inside to vaporize. Then, the high-temperature steam rises to the above-ground heat exchange component 4 through the steam guiding channel 1. The above-ground heat exchange component 4 exchanges heat with the heat transfer medium in the above-ground load device, thereby causing the high-temperature steam in the above-ground heat exchange component 4 to release heat and liquefy. The liquefied low-temperature liquid then flows back to the underground heat exchange component 2 through the liquid injection channel 3 to absorb heat and vaporize again, completing the circulation of the heat exchange medium in the medium circulation loop.
[0035] During the heat exchange medium circulation process, the vacuum pump assembly 7 operates to draw negative pressure into the medium circulation loop and / or the underground heat exchange assembly 2, so that the heat exchange medium is in a negative pressure environment, which lowers the boiling point of the heat exchange medium and accelerates the vaporization of the heat exchange medium. The vaporized heat exchange medium can float to the ground surface under its own buoyancy and enter the ground heat exchange assembly 4 to release heat, thereby improving the efficiency of geothermal collection.
[0036] In some embodiments, the steam guide channel 1 is arranged vertically and connected in series with a number of fan assemblies 6 for driving the steam in the steam guide channel 1 to float upward.
[0037] The steam guide channel 1 is arranged vertically, which helps the vaporized heat exchange medium to rise quickly. Furthermore, the fan assembly 6 connected in series in the steam guide channel 1 can accelerate the rise of the vaporized heat exchange medium. At the same time, a negative pressure zone is formed below the fan assembly 6, which forces the gas in the underground heat exchange component 2 to flow into the steam guide channel 1, further reducing the gas pressure in the underground heat exchange component 2, further reducing the boiling point of the heat exchange medium in the underground heat exchange component 2, and accelerating the vaporization efficiency of the heat exchange medium.
[0038] In some embodiments, the geothermal vertical heat conduction system further includes an equipment maintenance compartment, and the fan assembly 6 is disposed in the equipment maintenance compartment;
[0039] The fan assembly 6 and the steam guide channel 1 can be detached and installed.
[0040] By setting up an equipment maintenance compartment and placing the fan assembly 6 inside the equipment maintenance compartment, the maintenance convenience of the fan assembly 6 is improved. At the same time, the fan assembly 6 and the steam guide channel 1 are installed in a detachable manner, which further improves the maintenance convenience of the fan assembly 6.
[0041] In some embodiments, the steam guide channel 1 is provided with an insulation layer to reduce heat loss from the channel.
[0042] By wrapping the steam guide channel 1 with an insulation layer, the temperature drop of the high-temperature steam during the rising process is reduced, thereby allowing more heat from the underground heat source to be carried to the surface heat exchange component 4 by the high-temperature steam, which improves the efficiency of geothermal extraction.
[0043] In actual implementation, the insulation layer is preferably made of insulating cement material. That is, the pipe of the steam channel 1 is wrapped with insulating cement material, which can reduce the heat loss from the pipe and reduce the corrosion of the pipe by external soil moisture.
[0044] In some embodiments, the injection channel 3 is arranged vertically and connected in series with a downward-conducting one-way valve assembly 8;
[0045] The upper inlet of the liquid injection channel 3 is connected to the lowest point of the ground heat exchange component 4.
[0046] like Figure 1 and Figure 2 As shown, a downward-directing one-way valve assembly 8 is installed in the liquid injection channel 3 to effectively prevent high-temperature steam from floating upward through the liquid injection channel 3, avoid obstruction of the reflux of the condensed heat exchange medium caused by air flotation, and avoid the decrease in steam temperature caused by the convergence of high-temperature steam and low-temperature liquid heat exchange medium.
[0047] At the same time, the upper inlet of the liquid injection channel 3 is connected to the lowest point of the ground heat exchange component 4, so that the condensed liquid heat exchange medium in the ground heat exchange component 4 can flow back quickly, avoiding the accumulation of liquid heat exchange medium in the ground heat exchange component 4.
[0048] In some embodiments, the geothermal vertical heat conduction system further includes a heating component 5 for direct heating of the heat transfer medium within the above-ground load module.
[0049] By setting up heating component 5, the heat transfer medium in the ground load device is directly heated, thereby increasing the temperature of the heat transfer medium in the ground load device during the system startup phase, enabling the ground load device to quickly output heat.
[0050] like Figure 1 As shown, the ground load device is a heat exchange boiler, the ground heat exchange component 4 is the coil inside the heat exchange boiler, and the heating component 5 is the auxiliary heating device inside the heat exchange boiler. By heating simultaneously through the coil and the auxiliary heating device, the heat exchange boiler can quickly output heat during the start-up phase.
[0051] In some embodiments, such as Figure 2 As shown, the ground load device is a water tank with water as the internal heat transfer medium. The ground heat exchange component 4 is a coil immersed in water, and the heating component 5 is an auxiliary heating device set at the bottom of the water tank. The water in the water tank is heated rapidly by the simultaneous heating of the coil and the auxiliary heating device.
[0052] In some embodiments, the underground heat exchange assembly 2 includes a heat exchange tube made of a material with high thermal conductivity.
[0053] And / or, the underground heat exchange assembly 2 and / or the above-ground heat exchange assembly 4 include several sets of heat-conducting fins for improving heat exchange efficiency.
[0054] The underground heat exchange component 2 and / or the above-ground heat exchange component 4 are made of metal materials with high thermal conductivity, preferably copper, aluminum, etc., which can effectively improve the heat transfer efficiency.
[0055] Meanwhile, by setting heat-conducting fins in the underground heat exchange component 2 and / or the above-ground heat exchange component 4, the heat exchange area is increased, and the heat exchange efficiency is further improved.
[0056] In some embodiments, the geothermal vertical heat conduction system further includes a pressure transmitter 9 and / or a temperature transmitter 10;
[0057] Pressure transmitter 9 is used to acquire pressure data within the medium circulation loop and / or underground heat exchange assembly 2;
[0058] The temperature transmitter component 10 is used to acquire the temperature data of the heat transfer medium inside the ground load module.
[0059] By installing a pressure transmitter 9 in the medium circulation loop, the pressure of the medium circulation loop can be monitored, so as to control the operation of the vacuum pump assembly 7.
[0060] By adding a temperature transmitter 10 to the ground load module, the temperature of the heat transfer medium can be monitored, so as to control the operation of the heating component 5.
[0061] In some embodiments, the inner walls of the medium circulation loop channels are provided with an anti-corrosion layer.
[0062] The inner walls of the pipes in the steam transfer channel 1, underground heat exchange component 2, liquid injection channel 3, and above-ground heat exchange component 4 are made of anti-corrosion materials or anti-corrosion coatings to reduce the corrosion of the pipe inner walls by the heat exchange medium and increase the service life of the system.
[0063] In addition to the geothermal vertical heat conduction systems disclosed in the above embodiments, this utility model also provides a control method for controlling any of the above geothermal vertical heat conduction systems, including:
[0064] Acquire the pressure data P in the medium circulation loop and / or underground heat exchange component 2, and determine whether P is less than the preset pressure P0;
[0065] If not, start the vacuum pump assembly 7 until P < P0;
[0066] If not, return to the step of obtaining pressure P.
[0067] The gas pressure in the medium circulation loop and / or underground heat exchange component 2 is acquired in real time. When the pressure exceeds the preset value, the vacuum pump component 7 is started to draw negative pressure into the medium circulation loop and / or underground heat exchange component 2, so that the heat exchange medium in the underground heat exchange component 2 is always in a low-pressure state, thereby reducing the boiling point of the heat exchange medium in the underground heat exchange component 2 and causing it to vaporize rapidly.
[0068] In addition to the geothermal vertical heat conduction systems disclosed in the above embodiments, this utility model also provides a control method for controlling any of the above geothermal vertical heat conduction systems, including:
[0069] Obtain the temperature T of the heat transfer medium inside the ground load device and determine whether T is less than the preset temperature T0;
[0070] If so, control the heating component 5 to operate until T > T0.
[0071] If not, determine whether T is greater than the second preset temperature T1;
[0072] If so, control the vacuum pump assembly 7 to stop working, and / or control the fan assembly 6 to reduce power until T < T1;
[0073] If not, return to the step of obtaining temperature T.
[0074] Where T1 is greater than T, that is, when the temperature of the heat transfer medium exceeds the upper limit of the output temperature, the vacuum pump assembly 7 is stopped from working, the gas pressure in the medium circulation loop and / or the underground heat exchange assembly 2 is stopped, thereby causing the boiling point of the heat exchange medium in the underground heat exchange assembly 2 to rise appropriately, slowing down the efficiency of heat exchange medium vaporization. At the same time, the power of the fan assembly 6 is reduced, that is, the rising rate of high temperature steam is slowed down, thereby reducing the upward transfer of heat from the underground heat source, and thus causing the temperature of the heat transfer medium to return to the normal output temperature range.
[0075] Furthermore, by monitoring the temperature of the heat transfer medium inside the ground load device in real time, when the temperature is lower than the preset value, the heating component 5 is controlled to heat the heat transfer medium, ensuring the stable output temperature of the ground load device.
[0076] In some embodiments, water is used as the heat exchange medium, preferably pure water, to reduce scale buildup on the inner wall of the pipe. During use, water enters the underground heat exchange component 2 through the injection channel 3, absorbs underground heat energy, and vaporizes into water vapor. The water vapor floats up through the steam guide channel 1 and enters the above-ground heat exchange component 4 to release heat. After releasing heat, it liquefies and is reinjected into the underground heat exchange component 2 through the injection channel 3, thus realizing water circulation.
[0077] In some embodiments, other phase change materials are used as heat exchange mediums. They absorb heat and vaporize in the underground heat exchange component 2 and release heat and liquefy in the above-ground heat exchange component 4 to achieve circulation and realize the same function.
[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0079] The geothermal vertical heat conduction system provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A geothermal vertical heat conduction system, characterized in that, include: The medium circulation loop includes a steam conduction channel (1), an underground heat exchange component (2), a liquid injection channel (3), and an above-ground heat exchange component (4) connected in series and in a closed loop. The medium circulation loop is filled with a heat exchange medium. The underground heat exchange component (2) is used to exchange heat with underground thermal energy, and the above-ground heat exchange component (4) is used to exchange heat with the above-ground load module. A vacuum pump assembly (7) is connected to the medium circulation loop and is used to create a negative pressure within the underground heat exchange assembly (2).
2. The geothermal vertical heat conduction system according to claim 1, characterized in that, The steam guide channel (1) is arranged vertically and connected in series with several fan assemblies (6) to drive the steam in the steam guide channel (1) to float upward.
3. The geothermal vertical heat conduction system according to claim 2, characterized in that, It also includes an equipment maintenance compartment, in which the fan assembly (6) is located; The fan assembly (6) and the steam guide channel (1) are detachable and installable.
4. The geothermal vertical heat conduction system according to claim 1, characterized in that, The steam guide channel (1) is equipped with an insulation layer to reduce heat loss from the channel.
5. The geothermal vertical heat conduction system according to claim 1, characterized in that, The injection channel (3) is arranged vertically and connected in series with a downward-conducting one-way valve assembly (8). The upper inlet of the injection channel (3) is connected to the lowest point of the ground heat exchange component (4).
6. The geothermal vertical heat conduction system according to claim 1, characterized in that, It also includes a heating component (5) for direct heating of the heat transfer medium within the ground load module.
7. The geothermal vertical heat conduction system according to claim 1, characterized in that, The underground heat exchange assembly (2) includes heat exchange tubes made of a material with high thermal conductivity; And / or, the underground heat exchange assembly (2) and / or the above-ground heat exchange assembly (4) include several sets of heat-conducting fins for improving heat exchange efficiency.
8. The geothermal vertical heat conduction system according to claim 1, characterized in that, It also includes a pressure transmitter assembly (9) and / or a temperature transmitter assembly (10); The pressure transmitter (9) is used to acquire pressure data in the medium circulation loop and / or the underground heat exchange assembly (2); The temperature transmitter component (10) is used to acquire the temperature data of the heat transfer medium in the ground load module.