Horizontal butt joint well type middle-deep layer geothermal heat exchanger

Abstract

The utility model belongs to the technical field of geothermal heat exchangers, and particularly relates to a horizontal butt joint well type middle-deep layer geothermal heat exchanger which comprises two well bodies installed in the land, the two well bodies are communicated through a horizontal heat exchange pipe arranged horizontally, the geothermal heat exchanger further comprises a plurality of dosing mechanisms, a plurality of dosing openings are formed in the horizontal heat exchange pipe, and the dosing mechanisms are communicated with the horizontal heat exchange pipe. The plurality of dosing mechanisms are respectively communicated with the plurality of dosing ports, the dosing ports are horizontally arranged on the horizontal heat exchange pipe at equal intervals, the dosing mechanisms are communicated with the dosing ports through vertical pipes, check valves are fixedly connected between the vertical pipes and the dosing ports, the dosing mechanisms comprise dosing boxes, the lower sides of the dosing boxes are communicated with the upper ends of the vertical pipes, and the lower sides of the dosing boxes are communicated with the lower ends of the vertical pipes. A medicine inlet is fixedly connected to the upper side of the outer side of the medicine inlet box, and a sealing cover is detachably installed on the outer side of the medicine inlet. According to the utility model, the length of the pipeline cleaned by the cleaning agent at each dosing position can be reduced, and the cleaning effect of the cleaning agent on scale on the inner wall of the horizontal heat exchange pipe is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of geothermal heat exchanger technology, specifically relating to a horizontal docking well-type medium-deep geothermal heat exchanger. Background Technology

[0002] With the increasing demand for clean energy, geothermal energy has received widespread attention as a sustainable energy resource. Medium-deep geothermal energy, due to its abundant reserves and high temperatures, has enormous application potential in heating, power generation, and other fields. Horizontal docking well-type medium-deep geothermal heat exchangers play a crucial role in the development and utilization of medium-deep geothermal energy.

[0003] During the operation of a horizontally connected well-type deep geothermal heat exchanger, the circulating medium continuously flows within the horizontal heat exchange tubes to achieve heat exchange with geothermal energy. However, groundwater typically contains minerals such as calcium and magnesium, which, over time, form scale on the inner wall of the horizontal heat exchange tubes. The presence of scale brings a series of serious problems. On the one hand, scale reduces the heat transfer efficiency of the heat exchange tubes because the thermal conductivity of scale is much lower than that of the heat exchange tube material. This hinders heat transfer, thus affecting the overall performance of the geothermal heat exchanger and leading to a decrease in heating or power generation efficiency. On the other hand, scale accumulation reduces the effective inner diameter of the pipes, increasing the flow resistance of the circulating medium. This not only requires higher energy consumption to maintain the normal flow of the circulating medium but may also damage the pipes and related equipment due to excessive pressure during long-term operation.

[0004] Traditional methods for cleaning geothermal heat exchanger pipes often have shortcomings. For single-point dosing cleaning, when the horizontal heat exchanger tubes are long, the distribution of the cleaning agent within the pipe is uneven, making it difficult to ensure effective removal of scale throughout the entire pipe. Furthermore, due to the long distance of the pipe, the concentration of the cleaning agent gradually decreases during flow, resulting in poor cleaning of sections of the pipe far from the dosing point. In addition, increasing the amount of cleaning agent to ensure cleaning effectiveness may cause adverse effects such as corrosion of the pipe materials, especially when using acidic cleaning agents. Therefore, it is necessary to develop a new and more effective method for cleaning scale from horizontally connected well-type medium-deep geothermal heat exchangers to ensure the long-term stable operation and high efficiency of the geothermal heat exchangers. Utility Model Content

[0005] The purpose of this invention is to provide a horizontally docked well-type medium-deep geothermal heat exchanger that can reduce the length of pipes that the cleaning agent is responsible for cleaning at each dosing point, thus ensuring the cleaning effect of the cleaning agent on the scale on the inner wall of the horizontal heat exchange tube.

[0006] The specific technical solution adopted by this utility model is as follows:

[0007] A horizontally connected well-type medium-deep geothermal heat exchanger includes two wells installed inside the soil, and the two wells are connected by horizontally arranged heat exchange pipes.

[0008] The geothermal heat exchanger also includes multiple dosing mechanisms, and the horizontal heat exchange tube is provided with multiple dosing ports, with each of the multiple dosing mechanisms connected to the multiple dosing ports.

[0009] Furthermore, the dosing ports are horizontally and equidistantly arranged on the horizontal heat exchange tubes.

[0010] Furthermore, the dosing mechanism and the dosing port are connected by a riser pipe.

[0011] Furthermore, a check valve is fixedly connected between the riser and the dosing port.

[0012] Furthermore, the dosing mechanism includes a dosing box, the lower side of which is connected to the upper end of the riser, and a dosing inlet is fixedly connected to the upper side of the outer side of the dosing box. A sealing cap is detachably installed on the outer side of the dosing inlet.

[0013] Furthermore, a valve is fixedly connected to the lower end of the medicine inlet box.

[0014] The technical effects achieved by this utility model are as follows:

[0015] This utility model discloses a horizontal docking well-type medium-deep geothermal heat exchanger. By setting up multiple dosing mechanisms to add chemicals at multiple locations on the horizontal heat exchange tubes, it can reduce the length of pipe that the cleaning agent is responsible for cleaning at each dosing location, thus ensuring the cleaning effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the dosing mechanism of this utility model;

[0018] Figure 3 This is a side view of the structure of the drug dispensing mechanism of this utility model.

[0019] The attached diagram lists the components represented by each number as follows:

[0020] 1. Land; 2. Well body; 3. Horizontal heat exchange tube; 4. Chemical inlet box; 5. Chemical inlet; 6. Sealing cap; 7. Valve; 8. Riser; 9. Check valve. Detailed Implementation

[0021] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0022] like Figure 1-3 As shown, a horizontally connected well-type medium-deep geothermal heat exchanger includes two well bodies 2 installed inside the land 1, with the upper ends of the two well bodies 2 located on the upper side of the land 1. The two well bodies 2 are connected by a horizontally arranged horizontal heat exchange pipe 3 located in the medium-deep underground layer, i.e., 200-3000 meters underground. The temperature of medium-deep geothermal resources is usually higher. The circulating medium enters the interior of the horizontal heat exchange pipe 3 through one well body 2 and then exits through the other well body 2. When the circulating medium flows inside the horizontal heat exchange pipe 3, the medium-deep geothermal energy will exchange heat with the circulating medium to achieve the purpose of heating the circulating medium.

[0023] Here, the circulating medium can be water or antifreeze.

[0024] The core of this technical solution lies in the inclusion of multiple dosing mechanisms. Multiple dosing ports are installed on the horizontal heat exchange tube 3, equidistantly spaced horizontally. Each dosing mechanism is connected to one of these ports. When cleaning the water channels on the inner wall of the horizontal heat exchange tube 3 is required, cleaning agent can be added to the ports through the well body 2 and the multiple dosing mechanisms. The cleaning agent can be an acidic cleaning agent or a chelating agent. The well body 2 and the multiple dosing mechanisms serve as the initial dosing points. After entering the horizontal heat exchange tube 3, the cleaning agent removes the scale inside. The horizontal heat exchange tube 3 is divided into multiple sections through the multiple dosing ports, thus allowing for segmented cleaning and reducing the length of pipe cleaned by the cleaning agent at each initial dosing point, ensuring effective cleaning.

[0025] like Figure 1 As shown, the dosing mechanism is fixedly connected to the upper side of the land 1, and the dosing mechanism and the dosing port are connected by a riser 8. At this time, the main structure of the dosing mechanism can be set on the ground through the setting of the riser 8, which is convenient for maintenance.

[0026] Furthermore, a check valve 9 can be fixedly connected between the riser 8 and the dosing port, which can reduce the phenomenon of backflow of the circulating medium inside the soil 1 into the dosing tank 4.

[0027] like Figure 1-3As shown, the dosing mechanism includes a dosing tank 4, the lower side of which is connected to the upper end of the riser 8. It can automatically input the cleaning agent into the horizontal heat exchange tube 3 by gravity. A dosing port 5 is fixedly connected to the upper side of the outer side of the dosing tank 4. The dosing agent can be added into the dosing tank 4 through the dosing port 5. The position of the dosing port 5 can reduce the phenomenon of dust falling into the dosing tank 4.

[0028] A sealing cover 6 is detachably installed on the outside of the inlet 5. The installation method is preferably threaded connection or snap-fit. The sealing cover 6 can reduce the phenomenon of dust entering the inside of the inlet box 4.

[0029] A valve 7 is fixedly connected to the lower end of the medicine inlet box 4. The lower end of the valve 7 is connected to the upper end of the riser pipe 8. At this time, through the setting of the valve 7, the medicine inlet box 4 can be used as a storage box, and medicine can be added as needed each time. One addition of medicine can be used for multiple additions.

[0030] Furthermore, valve 7 can be a metering solenoid valve, with the model number Honeywell 22000130.

[0031] The working principle of this utility model is as follows:

[0032] The circulating medium enters the horizontal heat exchange tube 3 through one well body 2 and then exits through another well body 2. When the circulating medium flows inside the horizontal heat exchange tube 3, the medium-deep geothermal energy will exchange heat with the circulating medium to achieve the purpose of heating the circulating medium.

[0033] When it is necessary to clean the water channels on the inner wall of the horizontal heat exchange tube 3, cleaning agent can be added to multiple dosing ports through the well body 2 and multiple dosing mechanisms. The cleaning agent can be an acidic cleaning agent or a chelating agent. At this time, the well body 2 and multiple dosing mechanisms serve as the initial dosing positions. After the cleaning agent enters the horizontal heat exchange tube 3, it will clean the scale inside the horizontal heat exchange tube 3. The horizontal heat exchange tube 3 is divided into multiple sections through multiple dosing ports, thereby cleaning the horizontal heat exchange tube 3 in multiple sections, reducing the length of pipe that the cleaning agent entering at each initial dosing position is responsible for cleaning, and ensuring the cleaning effect.

[0034] In summary, this technical solution reduces the length of pipe that the cleaning agent is responsible for cleaning at each dosing point by setting up multiple dosing mechanisms to add chemicals at multiple locations on the horizontal heat exchange tube 3, thus ensuring the cleaning effect.

[0035] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A horizontally docked well-type medium-deep geothermal heat exchanger, characterized in that: It includes two well bodies (2) installed inside the land (1), and the two well bodies (2) are connected by horizontally arranged horizontal heat exchange pipes (3); The geothermal heat exchanger also includes multiple dosing mechanisms, and the horizontal heat exchange tube (3) is provided with multiple dosing ports, and the multiple dosing mechanisms are respectively connected to the multiple dosing ports.

2. The horizontal docking well-type medium-deep geothermal heat exchanger according to claim 1, characterized in that: The dosing ports are horizontally and equidistantly arranged on the horizontal heat exchange tube (3).

3. A horizontally docked well-type medium-deep geothermal heat exchanger according to claim 1, characterized in that: The dosing mechanism and the dosing port are connected by a riser (8).

4. A horizontally docked well-type medium-deep geothermal heat exchanger according to claim 3, characterized in that: A check valve (9) is fixedly connected between the riser (8) and the dosing port.

5. A horizontally docked well-type medium-deep geothermal heat exchanger according to claim 3, characterized in that: The dosing mechanism includes a dosing box (4), the lower side of which is connected to the upper end of the riser (8), and a dosing inlet (5) is fixedly connected to the upper side of the outer side of the dosing box (4). A sealing cover (6) is detachably installed on the outer side of the dosing inlet (5).

6. A horizontally docked well-type medium-deep geothermal heat exchanger according to claim 5, characterized in that: A valve (7) is fixedly connected to the lower end of the medicine inlet box (4).

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