A salt-cavity ground source heat pump pipeline system and its heat extraction method

Abstract

This invention provides a ground source heat pump pipeline system for a salt cavity and its heat extraction method. The system includes ground equipment, a transport pipeline for carrying the heat transfer medium, and a generating pipe assembly sleeved outside the transport pipeline. The transport pipeline and the generating pipe assembly are inserted into the brine of the salt cavity. The transport pipeline is connected to the ground equipment, which introduces generating gas and generating liquid into the generating pipe assembly. The generating gas and generating liquid come into contact with each other, causing a reaction within the generating pipe assembly to form a protective layer. This protective layer is located outside the transport pipeline. Utilizing the constant-temperature brine within the abandoned salt cavity as a heat source / sink, and through an innovative pipeline structure and protective layer formation mechanism, this system effectively utilizes industrial wastewater and exhaust gas. It achieves efficient and stable heating / cooling while extending the system's service life and provides a new technological pathway for the utilization of abandoned salt cavities, industrial wastewater, and industrial exhaust gas.

Description

Technical Field

[0001] This invention relates to the field of geothermal energy utilization and industrial waste resource recovery technology, and is particularly applicable to a salt cavity ground source heat pump pipeline system and its heat extraction method. Background Technology

[0002] Ground source heat pump technology is a highly efficient and energy-saving method for building heating and cooling, which achieves energy conversion through heat exchange with shallow geothermal energy. However, traditional ground source heat pump systems rely on a large number of vertical or horizontal buried pipes, requiring a large footprint, high initial investment costs, and are limited by geological conditions.

[0003] Meanwhile, with the depletion of salt mine resources, a large number of abandoned salt cavities have been created. These cavities are typically located hundreds of meters underground, possessing vast spaces and stable brine temperatures, making them potential high-quality heat sources / sinks. However, directly immersing conventional ground source heat pump pipes in highly corrosive brine will cause rapid corrosion and scaling of the pipes, severely impacting system lifespan and energy efficiency.

[0004] In addition, industrial production processes generate large amounts of industrial wastewater containing alkaline components and industrial waste gas rich in carbon dioxide (CO2). Direct discharge of these wastes causes environmental pollution, while traditional treatment methods are costly.

[0005] Therefore, how to achieve the synergistic utilization of abandoned salt chambers, industrial wastewater and industrial waste gas, and construct a comprehensive system that can efficiently extract geothermal energy, extend equipment life, and achieve environmental protection and emission reduction, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned problems and provide a salt cavity ground source heat pump pipeline system and its heat extraction method.

[0007] To achieve the above-mentioned objectives, the present invention provides a salt cavity ground source heat pump pipeline system, including ground equipment, a conveying pipeline for carrying the heat transfer medium, and a generating pipe assembly sleeved on the outside of the conveying pipeline. The conveying pipeline and the generating pipe assembly are inserted into the brine of the salt cavity. The conveying pipeline is connected to the ground equipment, and the ground equipment introduces generating gas and generating liquid into the generating pipe assembly.

[0008] The generating gas and generating liquid come into contact with each other so that they react within the generating tube assembly and form a protective layer.

[0009] More specifically, the generating pipe assembly includes an air inlet pipe sleeved outside the conveying pipe and a water inlet pipe sleeved outside the air inlet pipe. Several air inlet holes are opened on the air inlet pipe facing the water inlet pipe. The generated gas escapes through the air inlet holes toward the water inlet pipe and comes into contact with the generated liquid.

[0010] More specifically, the pressure inside the air intake pipe is greater than the pressure inside the water intake pipe.

[0011] More specifically, the diameter of the air inlet is less than 1 mm.

[0012] More specifically, the ground equipment includes a detection component, which is disposed inside the water inlet pipe.

[0013] More specifically, the detection device is set as a borehole inspection instrument.

[0014] More specifically, the conveying pipe, air inlet pipe, and water inlet pipe are all U-shaped.

[0015] More specifically, the generating gas contains carbon dioxide, and the concentration of carbon dioxide is greater than 10%; The pH value of the liquid in question is greater than 8.5.

[0016] More specifically, the ground equipment includes a circulating pump and a heat pump unit, with the heat pump unit connected to the beginning and end of the delivery pipeline.

[0017] A method for heat extraction using a salt-cavity ground-source heat pump pipeline system includes the following steps: S1: Place delivery pipes and generating pipe assemblies into the salt chamber; S2: Install ground equipment and connect it to the delivery pipeline and generating pipe assembly; S3: Input the generating liquid into the water inlet pipe and the generating gas into the air inlet pipe. If the outer side of the delivery pipe is completely covered by the protective layer, proceed to step S4; otherwise, repeat this step. S4: The heat transfer medium begins to circulate. If the protective layer is in normal use, repeat this step. If only the protective layer is damaged and the water inlet pipe of the pipe assembly is not corroded, repeat step S3. If the protective layer is damaged after the water inlet pipe is corroded, reconnect the water inlet pipe and repeat step S3.

[0018] This invention mainly designs a salt cavity ground source heat pump pipeline system and its heat collection method. It utilizes the constant-temperature brine in the abandoned salt cavity as a heat source / heat sink. Through innovative pipeline structure and protective layer generation mechanism, it effectively utilizes industrial wastewater and exhaust gas. While achieving efficient and stable heating / cooling, it extends the service life of the system and provides a new technical path for the utilization of abandoned salt cavities, industrial wastewater and industrial exhaust gas. Attached Figure Description

[0019] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments described below are for illustrative purposes only and do not limit the scope of this application. In the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is the invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic flowchart of the heat collection method of the present invention; In the diagram: 1. Delivery pipeline; 11. Heat pump unit; 12. Circulation pump; 2. Air inlet pipeline; 21. Air inlet; 22. Air storage tank; 23. Air injection pump; 3. Water inlet pipeline; 31. First water storage tank; 32. Water injection pump; 33. Second water storage tank; 4. Brine. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," 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 invention and for simplifying the description, and do not 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 scope of protection of this invention. The embodiments of this invention will now be described in detail with reference to the accompanying drawings.

[0022] It should be understood that the accompanying drawings are for illustrative purposes only.

[0023] A salt-cavity ground source heat pump pipeline system, such as Figures 1-2As shown, it includes ground equipment, a conveying pipe 1 for carrying the heat transfer medium, and a generating pipe assembly sleeved on the outside of the conveying pipe 1. The conveying pipe 1 and the generating pipe assembly are inserted into the brine 4 in the salt chamber. The delivery pipeline 1 is connected to the ground equipment. The ground equipment introduces generating gas and generating liquid into the generating pipe group. The generating gas and generating liquid react in the generating pipe group and generate a protective layer. The protective layer covers the outer area of ​​the delivery pipeline 1.

[0024] Furthermore, the conveying pipe 1 is configured as a U-shaped pipe, through which the heat transfer medium flows, absorbing heat from the brine 4 and transferring the heat to the next process. Specifically, the ground equipment includes a circulating pump 12 and a heat pump unit 11. The heat pump unit 11 is connected to both ends of the conveying pipe 1, forming a closed loop. The circulating pump 12 ensures that the heat transfer medium circulates within the conveying pipe 1, continuously supplying heat to the next process.

[0025] The generating pipe assembly is sleeved on the outside of the conveying pipe 1. The generating pipe assembly is used to generate a protective layer. Specifically, the generating pipe assembly includes an air inlet pipe 2 sleeved on the outside of the conveying pipe 1 and a water inlet pipe 3 sleeved on the outside of the air inlet pipe 2. Gas is introduced into the water inlet pipe 3 through the air inlet pipe 2. The generating gas flows in the air inlet pipe 2 and the generating liquid flows in the water inlet pipe 3. The generating gas flows toward the generating liquid and reacts with the generating liquid to generate a protective layer.

[0026] Both the air inlet pipe 2 and the water inlet pipe 3 are adapted to the shape of the conveying pipe 1, wrapping around the outside of the conveying pipe 1. In this design, both the air inlet pipe 2 and the water inlet pipe 3 are U-shaped. The air inlet pipe 2 is evenly wrapped around the outside of the conveying pipe 1, and the water inlet pipe 3 is evenly wrapped around the outside of the air inlet pipe 2, ensuring the uniform formation of the protective layer. Alternatively, the water inlet pipe 3 can be placed outside the conveying pipe 1, and the air inlet pipe 2 can be placed outside the water inlet pipe 3, with the gas in the air inlet pipe 2 flowing towards the water inlet pipe 3, or the liquid in the water inlet pipe 3 flowing towards the air inlet pipe 2, to produce a protective layer within either the air inlet pipe 2 or the water inlet pipe 3. In this design, the air inlet pipe 2 is placed outside the conveying pipe 1, and the water inlet pipe 3 is placed outside the air inlet pipe 2.

[0027] To ensure the effectiveness of the water inlet pipe 3, air inlet pipe 2, and conveying pipe 1, the water inlet pipe 3 and air inlet pipe 2 are made of metal materials that can be protected by a protective layer and are corrosion resistant, including but not limited to carbon steel; the conveying pipe 1 is made of polymer materials with hydrophobicity and corrosion resistance, including but not limited to polytetrafluoroethylene.

[0028] Specifically, a plurality of air inlets 21 are provided on the air inlet pipe 2 facing the water inlet pipe 3. These air inlets 21 are evenly arranged along the extension direction of the air inlet pipe 2, allowing the generated gas to enter the water inlet pipe 3 evenly through the air inlets 21 and react evenly with the generated liquid, resulting in a uniform protective layer. The generated gas flows towards the water inlet pipe 3 through the air inlets 21. Of course, the generated liquid can also flow towards the air inlet pipe 2. To ensure better use and effect, in this design, the generated gas flows towards the water inlet pipe 3 to form a protective layer on the inner wall of the water inlet pipe 3.

[0029] Furthermore, to ensure that the generated gas flows toward the water inlet pipe 3, the pressure inside the air inlet pipe 2 is greater than the pressure inside the water inlet pipe 3.

[0030] Furthermore, the diameter of the air inlet 21 is less than 1 mm, ensuring that the exhaust gas can continuously and evenly escape from the air inlet 21 and diffuse into the flow channel of the water inlet pipe 3.

[0031] The generated gas flows towards the water inlet pipe 3 through the air inlet 21 and comes into full contact with the generated liquid inside the water inlet pipe 3, and reacts to form a protective layer on the inner wall of the water inlet pipe 3. Furthermore, the generated gas is industrial waste gas and the generated liquid is industrial wastewater. Directly utilizing waste not only avoids pollution to the environment caused by direct discharge and relieves the burden of purification, but also generates a protective layer inside the water inlet pipe 3 to protect the conveying pipe 1 and reduce the corrosion of the conveying pipe 1 by the brine 4.

[0032] Specifically, an air storage tank 22 is provided at the air intake end of the air intake pipe 2 to store exhaust gas. An air injection pump 23 is provided on the air intake pipe 2 to control the flow rate of the injected gas or whether to start the injection. Furthermore, the generated gas contains carbon dioxide with a concentration greater than 10%.

[0033] A first water storage tank 31 is provided at the inlet end of the water inlet pipe 3 for storing industrial wastewater. A water injection pump 32 is provided on the water inlet pipe 3 to control the flow rate of the injected liquid or whether to start water injection. The generated liquid is industrial alkaline wastewater with a pH value greater than 8.5 and no solid impurities.

[0034] The ground equipment includes a detection component used to detect the formation of the protective layer inside the water inlet pipe 3. After the generated gas and liquid have been introduced into the pipe for a certain period of time, the detection component is placed inside the water inlet pipe 3 to detect the thickness of the protective layer. If the thickness at the thinnest point of the protective layer is greater than or equal to 2 mm, it indicates that the protective layer has been successfully constructed.

[0035] Specifically, the generating liquid is first introduced into the water inlet pipe 3. After a specific time, or until the generating liquid is seen in the second water storage tank 33, generating gas is injected into the air inlet pipe 2. As the generating gas flows through the air inlet pipe 2, it flows towards the water inlet pipe 3 through the air inlet hole 21 and reacts with the generating liquid in the water inlet pipe 3, producing a protective layer. After an estimated time, a test piece is placed in the water inlet pipe 3 to check whether the protective layer has been successfully constructed. If the thinnest part of the protective layer is less than 2mm, it indicates that the protective layer has not been successfully constructed. The generating gas and generating liquid are continuously introduced. If the thinnest part of the protective layer is equal to or greater than 2mm, it indicates that the protective layer has been successfully constructed, and the process proceeds to the next step. Of course, the generating liquid and generating gas can be introduced simultaneously. In this case, some gas may flow directly out of the air inlet pipe 2, resulting in waste.

[0036] In this scheme, the detection device is set as a borehole inspection instrument. After the borehole inspection instrument is inserted into the water inlet pipe 3, it detects the thickness of the protective layer at different positions. If the thinnest position is greater than or equal to 2mm, it indicates that the protective layer has been constructed.

[0037] A heat extraction method for a salt-cavity ground source heat pump pipeline system, such as Figure 3 As shown, the steps include: S1: Place delivery pipe 1 and generating pipe assembly into the salt chamber; Specifically, when on the ground, the air inlet pipe 2 of the generating pipe group is placed outside the delivery pipe 1, and the water inlet pipe 3 of the generating pipe group is placed outside the air inlet pipe 2. After the setup is completed, the delivery pipe 1 and the generating pipe group are placed into the brine chamber together until part of the pipe is submerged in the brine 4. S2: Install ground equipment and connect it to delivery pipeline 1 and generating pipe group; Specifically, a heat pump unit 11 and a circulation pump 12 are installed on the conveying pipeline 1, so that the conveying pipeline 1 forms a closed circulation loop, and the heat transfer medium is driven to circulate by the circulation pump 12; an air storage tank 22 is connected to the air inlet end of the air inlet pipeline 2, and an air injection pump 23 is installed near the air outlet pipe of the air inlet pipeline 2; a first water storage tank 31 is connected to the water inlet end of the water inlet pipeline 3, a water injection pump 32 is installed near the first water storage tank 31 of the water inlet pipeline 3, and a second water storage tank 33 is connected to the water outlet end of the water inlet pipeline 3. The water injection pump 32 inputs water from the first water storage tank 31 into the water inlet pipeline 3, and after flowing through the water inlet pipeline 3, it flows into the second water storage tank 33; S3: Input the generating liquid into the water inlet pipe 3 and the generating gas into the air inlet pipe 2. If the outer area of ​​the conveying pipe 1 is completely covered by the protective layer, proceed to step S4; otherwise, repeat this step. Specifically, the generating liquid is first introduced into the water inlet pipe 3. After a specific time, or when the generating liquid is seen in the second water storage tank 33, the generating gas is injected into the air inlet pipe 2. When the generating gas flows through the air inlet pipe 2, it will flow towards the water inlet pipe 3 through the air inlet hole 21 and react with the generating liquid in the water inlet pipe 3, forming a protective layer on the inner wall of the water inlet pipe 3. After an estimated time, a test piece is placed in the water inlet pipe 3 to check whether the protective layer has been completed. If the thinnest part of the protective layer is less than 2mm, it indicates that the protective layer has not been completed. The generating gas and generating liquid are continuously introduced. If the thinnest part of the protective layer is equal to or greater than 2mm, it indicates that the protective layer has been completed and the next step is initiated. Because the gas entering the water inlet pipe 3 will cause the liquid to tumble, thus avoiding the formation of a protective layer at the air inlet 21. At the same time, the diameter of the air inlet 21 on the air inlet pipe 2 is less than 1mm, and the pressure inside the air inlet pipe 2 is greater than the pressure inside the water inlet pipe 3. Therefore, no protective layer will form inside the air inlet 21.

[0038] Because the surface of the pipe is not absolutely smooth, solidified or semi-solidified sediment particles, after entering the water inlet pipe 3, are prone to mechanically getting stuck and adhering to the rough interface, joint steps and local defects of the pipe wall of the water inlet pipe 3, and further capture slurry and fine particles, thereby forming a protective layer on the water inlet pipe 3.

[0039] Of course, it is also possible to inject both generating gas and generating liquid at the same time, but this may result in some waste of generating gas. Specifically, the reaction between the gas and the liquid is as follows: Ca 2+ +2OH - +CO2→CaCO3↓+H2O; Mg 2+ +2OH - +CO2→MgCO3↓+H2O; The generated CaCO3 and MgCO3 crystals are deposited on the wall of the inlet pipe, forming a protective layer; The protective layer, a dense precipitate of calcium carbonate and magnesium carbonate, has a higher thermal conductivity than the brine 4 within the salt cavity. This creates a thermal bridge on the outer surface of the transport pipe 1. After corrosion of the inlet pipe 3, the protective layer reduces the thermal resistance between the walls of the transport pipe 1 and the air inlet pipe 2 and the brine 4, improving thermal conductivity and thus enhancing the efficiency of geothermal energy collection by the transport pipe 1. Simultaneously, the constant temperature of the abandoned brine 4 in the salt cavity provides an ideal heat source / sink for the ground source heat pump, significantly improving the system's energy efficiency ratio and operational stability, and overcoming the shortcomings of traditional shallow ground source heat pumps that are affected by seasonal and climatic changes.

[0040] S4: The heat transfer medium begins to circulate. If the protective layer is damaged, repeat step S3. If the protective layer is in normal use, repeat this step.

[0041] Before installing pipes into the salt cavity, it is necessary to first explore the salt cavity, including the depth of the abandoned salt cavity and the temperature of brine 4. The depth of the salt cavity is less than 200 m, and the temperature of brine 4 is between 5 and 40℃.

[0042] Specifically, after the protective layer is constructed, the circulating pump 12 and the heat pump unit 11 start operating, and the heat transfer medium begins to circulate. Because it has been placed in the brine 4 in the salt cave until the inlet pipe 3 is corroded, the protective layer is exposed in the brine 4. Because the protective layer has good thermal conductivity, when the water temperature difference between the inlet and outlet of the delivery pipe 1 is detected to be 3°C or more lower than the initial operation of the system, or when the energy efficiency ratio of the heat pump unit 11 drops by more than 20%, all factors that may cause changes in water temperature difference or energy efficiency ratio are investigated one by one, and the relevant factors are repaired. When the protective layer is found to be damaged, the protective layer repair procedure is initiated, the inlet pipe 3 is reinstalled, and the inlet pipe 3 is reconnected to the ground equipment. Then, step S3 is repeated. If there are no problems, this step is repeated to carry out heat collection. Example: Preliminary surveys revealed that the temperature of brine 4 in the salt chamber was stable at 28.6~29.1℃. After the protective layer was constructed and operated stably for 24 hours, the system entered the initial stable operation state. At this time, under the same heat pump load and circulation pump frequency, the flow velocity of the heat transfer medium in the conveying pipe 1 was 0.52m / s, the thickness of the thinnest part of the protective layer was measured to be 2.8mm, the inlet temperature of the conveying pipe 1 was 16.3℃, the outlet temperature was 23.8℃, and the temperature difference between the inlet and outlet was 7.5℃. After the system has been running continuously for 180 days, under similar brine temperatures, similar inlet temperatures, the same or similar heat pump loads, and the same circulating pump frequency, the inlet temperature of the conveying pipeline 1 is 16.7℃, the outlet temperature is 23.5℃, and the inlet-outlet temperature difference is 6.8℃. This is only 0.7℃ lower than the initial stable operating state, which does not meet the condition of a 3℃ decrease in temperature difference to determine the damage to the protective layer. This indicates that the protective layer is still in normal working condition. After the system ran continuously for 360 days, under the same or similar operating conditions, the inlet temperature of the conveying pipeline 1 was 16.6℃, the outlet temperature was 21.0℃, and the inlet-outlet temperature difference was 4.4℃, which was 3.1℃ lower than the initial stable operating state. At the same time, the test specimen showed that the protective layer had local discontinuities and peeling, with the thinnest part reduced to 1.8mm. After inspection, the inlet pipeline 3 did not show obvious corrosion, indicating that the protective layer had local damage. Therefore, step S3 was repeated to start the protective layer repair and generation program. After the generating liquid and gas were reintroduced and the protective layer was regenerated, the thickness of the thinnest part of the protective layer was restored to 2.7 mm. The inlet temperature of the conveying pipeline 1 was 16.4℃, the outlet temperature was 23.7℃, and the inlet-outlet temperature difference was restored to 7.3℃. This indicates that the system can initially judge the status of the protective layer through temperature difference monitoring, and verify the thickness and continuity of the protective layer in conjunction with the test pieces. By repeating step S3, the protective layer repair and heat collection performance restoration can be achieved. The operation monitoring data are detailed in Table 1. Table 1. Implementation Monitoring Data

[0043] The initial operation of the system refers to the temperature difference benchmark value and energy efficiency ratio benchmark value recorded after the protective layer is constructed and operates stably, rather than the instantaneous value when the system is first started. This provides a clear reference benchmark for damage assessment. To improve the accuracy of the assessment, the detection device can also be activated at the same time to confirm the status of the protective layer. At this time, the detection device has anti-corrosion function.

[0044] If the inlet pipe 3 is corroded by the brine 4 in the salt chamber, and if a repair procedure is required, that is, if a protective layer needs to be regenerated, the pipe is removed from the salt chamber and the inlet pipe 3 is reconnected. If the protective layer is found to be damaged during the periodic inspection of the protective layer by the testing component, but the inlet pipe 3 has not been corroded, then step S3 is repeated to repair the protective layer.

[0045] This invention mainly designs a salt cavity ground source heat pump pipeline system and its heat collection method. It uses the constant-temperature brine 4 in the abandoned salt cavity as a heat source / heat sink. Through innovative pipeline structure and protective layer generation mechanism, it effectively utilizes industrial wastewater and exhaust gas, achieving efficient and stable heating / cooling while extending the system's service life.

[0046] By cleverly utilizing the minerals in industrial wastewater and CO2 in exhaust gas, a protective layer is generated in situ on the surface of the conveying pipeline 1. This protective layer not only effectively isolates corrosive brine and significantly extends the pipeline's lifespan, but also allows for online detection and in-situ generation, thus realizing the system's self-repair function.

[0047] The protective layer is a dense precipitate of calcium carbonate (CaCO3) and magnesium carbonate (MgCO3), with a thermal conductivity of approximately 3.5–5.0 W / (m·K), significantly higher than that of the brine within the salt cavity (approximately 0.5–0.7 W / (m·K)). This creates thermal bridges on the surface of the transport pipe 1, reducing the thermal resistance between the pipe wall and the brine, increasing the thermal conductivity, and thus improving the efficiency of geothermal energy collection by the transport pipe 1. Simultaneously, the constant temperature of the brine in the abandoned salt cavity provides an ideal heat source / sink for the ground source heat pump, significantly improving the system's energy efficiency ratio and operational stability, and overcoming the shortcomings of traditional shallow ground source heat pumps that are affected by seasonal and climatic changes.

[0048] This invention provides a new, low-energy-consumption, and resource-efficient treatment method for waste salt chambers, industrial wastewater, and industrial waste gas, reducing carbon emissions and pollutant emissions.

[0049] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0050] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0051] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A brine ground source heat pump piping system characterized by: It includes ground equipment, a conveying pipe (1) for carrying the heat transfer medium, and a generating pipe assembly sleeved on the outside of the conveying pipe (1). The conveying pipe (1) and the generating pipe assembly are inserted into the brine (4) in the salt chamber. The conveying pipe (1) is connected to the ground equipment. The ground equipment introduces generating gas and generating liquid into the generating pipe assembly. The generating gas and generating liquid come into contact with each other so that they react within the generating tube assembly and form a protective layer.

2. The brine ground source heat pump piping system of claim 1, wherein: The generating pipe assembly includes an air inlet pipe (2) sleeved on the outside of the conveying pipe (1) and a water inlet pipe (3) sleeved on the outside of the air inlet pipe (2). Several air inlet holes (21) are opened on the air inlet pipe (2) facing the water inlet pipe (3). The generated gas escapes through the air inlet holes (21) towards the water inlet pipe (3) and comes into contact with the generated liquid.

3. The salt caverns ground source heat pump piping system of claim 2, wherein: The pressure inside the air inlet pipe (2) is greater than the pressure inside the water inlet pipe (3).

4. The salt caverns ground source heat pump piping system of claim 3, wherein: The diameter of the air inlet (21) is less than 1 mm.

5. The salt caverns ground source heat pump piping system of claim 2, wherein: The ground equipment includes a detection component, which is installed inside the water inlet pipe (3).

6. The salt caverns ground source heat pump piping system of claim 5, wherein: The testing device is a borehole inspection instrument.

7. The salt cavern ground source heat pump piping system of claim 1, wherein: The generated gas contains carbon dioxide, and the concentration of carbon dioxide is greater than 10%. The pH value of the liquid in question is greater than 8.

5.

8. The brine geothermal heat pump piping system of claim 1, wherein: The conveying pipe (1), air inlet pipe (2) and water inlet pipe (3) are all U-shaped.

9. The salt cavern ground source heat pump piping system of claim 1, wherein: The ground equipment includes a circulating pump (12) and a heat pump unit (11), which is connected to both ends of the delivery pipeline (1).

10. A method of heat extraction from a brine cavity ground source heat pump pipe system, characterized by: Applied to the salt cavity ground source heat pump pipeline system according to any one of claims 1-9, comprising the steps of: S1: Place the delivery pipe (1) and the generating pipe assembly into the salt chamber; S2: Set up ground equipment and connect it to the delivery pipeline (1) and the generating pipe group; S3: Input the generating liquid and generating gas into the generating pipe group respectively. If the outer side of the conveying pipe (1) is completely covered by the protective layer, proceed to step S4. Otherwise, repeat this step. S4: The heat transfer medium begins to circulate. If the protective layer is in normal use, repeat this step. If only the protective layer is damaged and the water inlet pipe of the pipe assembly is not corroded, repeat step S3. If the protective layer is damaged after the water inlet pipe is corroded, reconnect the water inlet pipe and repeat step S3.

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