Middle-deep geothermal well heat exchange sleeve

Abstract

The utility model relates to the technical field of heat exchange sleeves, in particular to a middle-deep geothermal well heat exchange sleeve which comprises a main pipeline, an exhaust mechanism is arranged on the top of the main pipeline, the main pipeline and the exhaust mechanism are both located in a high-temperature stratum, and the exhaust mechanism comprises an installation pipe connected to the top end of the main pipeline. A plurality of sets of protruding columns are fixedly connected to the surface of the mounting pipe, sealing rings are fixedly connected to the outer side walls of the protruding columns, and the bottom ends of the protruding columns are hemispherical and located below the mounting pipe; a plurality of groups of through holes are formed in the bottom ends of the convex columns; waterproof breathable films are fixedly connected to the interiors of the through holes; and the waterproof breathable films are made of a high-temperature-resistant material. Through the cooperation of the main pipeline and the exhaust mechanism and the combination design of the waterproof breathable film and the protruding columns, water vapor is allowed to be discharged freely, liquid water is prevented from entering, air pressure in the pipeline is effectively reduced, downward water pumping resistance of the outer sleeve water pump is reduced, and heat exchange efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange casing technology, specifically to a heat exchange casing for medium-deep geothermal wells. Background Technology

[0002] In order to supply clean and environmentally friendly geothermal energy to building heating, most existing mid-to-deep geothermal heating equipment uses double-layered pipes. The cold water used for heat exchange flows downward from the gap between the outer and inner pipes, and then, after high-temperature underground heat exchange, it becomes water with a certain amount of heat energy, and flows upward from the inner pipe.

[0003] A search revealed that patent document CN117760248A discloses a heat exchange casing for medium-deep geothermal wells and its processing technology. This invention belongs to the field of geothermal well heat exchange technology, specifically providing a heat exchange casing for medium-deep geothermal wells and its processing technology. The casing includes a pipe body, protrusions, and flow-blocking components. The protrusions are inward deformations formed by mechanical impact on the outer wall of the pipe body. Multiple protrusions are evenly distributed on the sidewall of the pipe body. The flow-blocking components are welded to the inside of the pipe body and consist of flow-blocking plates and connectors. Multiple flow-blocking plates are distributed in parallel, each with perforations. Connectors pass through the perforations sequentially and are fixedly connected to each flow-blocking plate. The protrusions increase the flow resistance of the heat exchange medium inside the pipe. The protrusions and flow-blocking components work together to frequently change the flow pattern of the heat exchange medium, achieving a composite flow-blocking effect, thus slowing down the flow velocity of the heat exchange medium and extending the heat exchange time. Simultaneously, the protrusions also increase the surface area of ​​the outer wall of the pipe body, thereby increasing the contact area between the outer surface of the pipe body and the underground rock mass, improving heat transfer efficiency.

[0004] When the above technical solution is used, if the well depth is too deep, the heat exchange medium will change its state from liquid to gas. As the water vapor with a certain amount of heat flows upward, the water flows downward while the water vapor flows upward. An impact force is formed between the water flow and the water vapor. This impact force increases the water pump's energy consumption and slows down the downward flow of water. Furthermore, as the amount of water flowing upward increases, the amount of water vapor below increases, resulting in increased gas pressure. This leads to greater resistance to the upward steam flow, increasing the downward pumping resistance of the outer casing pump. The inability of the water flowing downward will reduce the heat exchange efficiency of the water flow.

[0005] Therefore, it is necessary to invent a heat exchange casing for medium-deep geothermal wells to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a heat exchange casing for medium-deep geothermal wells, which achieves venting through the cooperation of the main pipe and the venting mechanism. This solves the problem in the prior art where increased gas pressure leads to greater upward steam resistance, which increases the downward pumping resistance of the outer casing water pump, and the inability of the upper water flow to flow downwards reduces the heat exchange efficiency of the water flow.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a heat exchange casing for a medium-deep geothermal well, comprising a main pipe, an exhaust mechanism at the top of the main pipe, both the main pipe and the exhaust mechanism being located in a high-temperature stratum, the exhaust mechanism comprising an installation pipe connected to the top of the main pipe, a plurality of protruding columns fixedly connected to the surface of the installation pipe, and a sealing ring fixedly connected to the outer wall of the protruding columns, the bottom end of the protruding columns being hemispherical, the bottom end of the protruding columns being located below the installation pipe, a plurality of through holes being opened at the bottom end of the protruding columns, and a waterproof and breathable membrane fixedly connected inside the through holes, the waterproof and breathable membrane being made of a high-temperature resistant material, and a connecting pipe fixedly connected to the top of the protruding columns, through the cooperation of the waterproof and breathable membrane and the protruding columns, allowing steam to enter the interior of the connecting pipe and be discharged.

[0008] Preferably, the bottom wall of the main pipeline is fixedly connected with several sets of connecting columns, and the outer side wall of the connecting columns is fixedly connected with two sets of baffles. The baffles are fixed by the connecting columns, thereby causing the heat exchange medium to frequently change its flow pattern.

[0009] Preferably, the baffle is wavy, and the baffles on the same set of connecting columns are parallel to each other. Through the cooperation of the baffle and the raised column, a composite flow obstruction effect is achieved, which further effectively slows down the flow velocity of the heat exchange medium and prolongs the heat exchange time.

[0010] Preferably, one end of the main pipeline is fixedly connected to an inlet pipe, and the other end of the main pipeline is fixedly connected to an outlet pipe. The tops of the inlet and outlet pipes are located in a low-temperature stratum, and the inlet and outlet of the main pipeline are realized through the inlet and outlet pipes.

[0011] Preferably, a connecting hoop is fixedly connected to the outer wall of the water outlet pipe, and an air outlet pipe is fixedly connected inside the connecting hoop. The bottom end of the air outlet pipe communicates with the waterproof and breathable membrane, and some parts are fixed by the connecting hoop.

[0012] Preferably, a limiting temperature-conducting ring is fixedly connected to the bottom end of the main pipeline, and several sets of limiting clamps are sleeved on the outside of the installation pipe. The limiting temperature-conducting ring is used to sleeve other parts and protect the main pipeline.

[0013] Preferably, a connecting plate is fixedly connected to the bottom end of the limiting hoop, and the connecting plate is bolted to the limiting temperature-conducting ring, thereby fixing the limiting hoop through the connecting plate.

[0014] Preferably, a labyrinth snap-fit ​​block is fixedly connected to the bottom end of the installation pipe. The labyrinth snap-fit ​​block is interlocked with the main pipe. A sealing groove is provided on the top of the labyrinth snap-fit ​​block, and a sealing strip is fixedly connected inside the sealing groove. A pressing block is abutted inside the sealing strip, and the pressing block is fixedly connected to the top end of the main pipe. The sealing performance is improved by the cooperation of the labyrinth snap-fit ​​block and other parts.

[0015] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0016] By coordinating the main pipeline and the exhaust mechanism, and utilizing a combination design of a waterproof and breathable membrane and raised columns, water vapor is allowed to escape freely while preventing liquid water from entering. This effectively reduces the internal air pressure of the pipeline, decreases the downward pumping resistance of the outer casing pump, and improves heat exchange efficiency. The flow path of the heat exchange medium is complicated by the baffle plate, increasing the turbulence effect, extending the heat exchange time, and improving the heat transfer efficiency. The baffle plate is fixed by the connecting column to prevent structural deformation and ensure long-term stable operation. A triple sealing structure is formed by the labyrinth clamping block, sealing strip, and extrusion block to prevent steam leakage and improve the reliability of the system in high-temperature and high-pressure geothermal wells. The structural stability is enhanced by the use of limiting temperature conducting rings and limiting clamps to prevent thermal deformation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the installation structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the connection structure between the installation pipe and the main pipeline of this utility model;

[0022] Figure 5 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Main pipe; 2. Exhaust mechanism; 201. Installation pipe; 202. Sealing ring; 203. Protruding column; 204. Waterproof and breathable membrane; 205. Connecting pipe; 3. Water inlet pipe; 301. Water outlet pipe; 4. Air outlet pipe; 5. Connecting clamp; 6. Baffle plate; 7. Connecting column; 8. Limiting and temperature-conducting ring; 9. Limiting clamp; 10. Connecting plate; 11. Labyrinth clamp block; 12. Sealing strip; 13. Extrusion block. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] This utility model provides, for example Figure 1-5 The diagram shows a heat exchange casing for a medium-deep geothermal well, comprising a main pipe 1, with an exhaust mechanism 2 at its top. Both the main pipe 1 and the exhaust mechanism 2 are located within a high-temperature stratum. The exhaust mechanism 2 includes an installation pipe 201 connected to the top of the main pipe 1. Several sets of protruding columns 203 are fixedly connected to the surface of the installation pipe 201, and sealing rings 202 are fixedly connected to the outer walls of the protruding columns 203. The bottom of each protruding column 203 is hemispherical and located below the installation pipe 201. Several sets of through holes are opened at the bottom of each protruding column 203, and a waterproof and breathable membrane 204 made of high-temperature resistant material is fixedly connected inside the through holes. A connecting pipe 205 is fixedly connected to the top of each protruding column 203, allowing the connection between the waterproof and breathable membrane 204 and the protruding column 203. The connection of the column 203 allows steam to enter the interior of the connecting pipe 205 and then exit. Several sets of connecting columns 7 are fixedly connected to the bottom wall of the main pipe 1. Two sets of baffles 6 are fixedly connected to the outer wall of the connecting columns 7. The baffles 6 are fixed by the connecting columns 7, thereby causing the heat exchange medium to frequently change its flow pattern. The baffles 6 are wavy. The baffles 6 on the same set of connecting columns 7 are parallel to each other. Through the cooperation of the baffles 6 and the raised column 203, a compound flow obstruction effect is achieved, which further effectively slows down the flow speed of the heat exchange medium and prolongs the heat exchange time. One end of the main pipe 1 is fixedly connected to the inlet pipe 3, and the other end of the main pipe 1 is fixedly connected to the outlet pipe 301. The top of the inlet pipe 3 and the outlet pipe 301 are located in the low temperature layer. The inlet and outlet of the main pipe 1 are realized through the inlet pipe 3 and the outlet pipe 301.

[0027] Refer to the instruction manual appendix Figure 1-5A connecting clamp 5 is fixedly connected to the outer wall of the outlet pipe 301. An air outlet pipe 4 is fixedly connected inside the connecting clamp 5. The bottom end of the air outlet pipe 4 communicates with the waterproof and breathable membrane 204. Some parts are fixed through the connecting clamp 5. A limiting temperature conducting ring 8 is fixedly connected to the bottom end of the main pipe 1. Several sets of limiting clamps 9 are sleeved on the outer side of the installation pipe 201. The limiting temperature conducting ring 8 is used to sleeve other parts and protect the main pipe 1. A connecting plate 10 is fixedly connected to the bottom end of the limiting clamp 9. The connecting plate 10 is bolted to the limiting temperature conducting ring 8. The limiting clamp 9 is fixed through the connecting plate 10. A labyrinth snap-fit ​​block 11 is fixedly connected to the bottom end of the installation pipe 201. The labyrinth snap-fit ​​block 11 snaps into the main pipe 1. A sealing groove is opened on the top of the labyrinth snap-fit ​​block 11, and a sealing strip 12 is fixedly connected inside the sealing groove. A pressing block 13 is pressed against the inside of the sealing strip 12. 13 is fixedly connected to the top of the main pipe 1. The sealing performance is improved by the cooperation of parts such as the labyrinth clamp block 11. Through the cooperation of the main pipe 1 and the exhaust mechanism 2, the waterproof and breathable membrane 204 and the protruding column 203 are combined to allow water vapor to be discharged freely while preventing liquid water from entering. This effectively reduces the internal air pressure of the pipe, reduces the downward pumping resistance of the outer pipe water pump, and improves the heat exchange efficiency. The flow path of the heat exchange medium is complicated by the baffle 6, which increases the turbulence effect, prolongs the heat exchange time, and improves the heat transfer efficiency. The baffle 6 is fixed by the connecting column 7 to prevent structural deformation and ensure long-term stable operation. The labyrinth clamp block 11, the sealing strip 12 and the extrusion block 13 form a triple sealing structure to prevent steam leakage and improve the reliability of the system in high temperature and high pressure geothermal wells. The limiting temperature conducting ring 8 and the limiting hoop 9 are used to enhance the structural stability and prevent thermal deformation.

[0028] The working principle of this practical application is as follows:

[0029] Refer to the instruction manual appendix Figure 1-5When water flows through the inlet pipe 3 and outlet pipe 301 to achieve the inlet and outlet of the main pipe 1, the high-temperature fluid flows inside the main pipe 1. Some of the liquid water evaporates into water vapor due to heat, causing the air pressure inside the main pipe 1 to rise. The vapor enters the waterproof and breathable membrane 204 through the through hole at the bottom of the protruding column 203. Since the waterproof and breathable membrane 204 only allows gas to pass through, and the hemispherical bottom design of the protruding column 203 reduces the direct impact of liquid water on the waterproof and breathable membrane 204, reducing the risk of scaling, the vapor smoothly enters the connecting pipe 205 and is finally discharged from the system through the air outlet pipe 4, avoiding the accumulation of air pressure. At this time, the heat exchange medium... The heat medium flows into the main pipe 1 from the inlet pipe 3. During the flow, it is affected by the baffle 6, which forms turbulence, increases the heat exchange time with the pipe wall, and improves the heat absorption efficiency. The heat exchange medium is then discharged through the outlet pipe 301. During operation, the baffle 6 is fixed by the connecting column 7 to prevent structural deformation and ensure long-term stable operation. The labyrinth clamp block 11, the sealing strip 12 and the extrusion block 13 form a triple sealing structure to prevent steam leakage and improve the reliability of the system in high-temperature and high-pressure geothermal wells. The limiting temperature conducting ring 8 and the limiting hoop 9 are used to enhance the structural stability and prevent thermal deformation.

[0030] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A heat exchange casing for a medium-deep geothermal well, comprising a main pipeline (1), characterized in that: The main pipe (1) is provided with an exhaust mechanism (2) at the top. Both the main pipe (1) and the exhaust mechanism (2) are located in a high-temperature stratum. The exhaust mechanism (2) includes an installation pipe (201) connected to the top of the main pipe (1). Several sets of protruding columns (203) are fixedly connected to the surface of the installation pipe (201), and a sealing ring (202) is fixedly connected to the outer wall of the protruding column (203). The bottom end of the protruding column (203) is hemispherical. The bottom end of the protruding column (203) is located below the installation pipe (201). Several sets of through holes are opened at the bottom end of the protruding column (203), and a waterproof and breathable membrane (204) is fixedly connected inside the through holes. The waterproof and breathable membrane (204) is made of high-temperature resistant material. A connecting pipe (205) is fixedly connected to the top of the protruding column (203).

2. The heat exchange casing for a medium-deep geothermal well according to claim 1, characterized in that: The bottom wall of the main pipe (1) is fixedly connected with several sets of connecting columns (7), and the outer wall of the connecting columns (7) is fixedly connected with two sets of baffles (6).

3. The heat exchange casing for a medium-deep geothermal well according to claim 2, characterized in that: The spoiler (6) is wavy, and the spoilers (6) on the same set of connecting columns (7) are parallel to each other.

4. The heat exchange casing for a medium-deep geothermal well according to claim 1, characterized in that: One end of the main pipe (1) is fixedly connected to a water inlet pipe (3), and the other end of the main pipe (1) is fixedly connected to a water outlet pipe (301). The tops of the water inlet pipe (3) and the water outlet pipe (301) are located in a low-temperature stratum.

5. A heat exchange casing for a medium-deep geothermal well according to claim 4, characterized in that: The outer wall of the water outlet pipe (301) is fixedly connected to a connecting hoop (5), and the inside of the connecting hoop (5) is fixedly connected to an air outlet pipe (4). The bottom end of the air outlet pipe (4) is connected to the waterproof and breathable membrane (204).

6. The heat exchange casing for a medium-deep geothermal well according to claim 1, characterized in that: The bottom end of the main pipe (1) is fixedly connected to a limiting temperature conducting ring (8), and several sets of limiting clamps (9) are sleeved on the outside of the installation pipe (201).

7. A heat exchange casing for a medium-deep geothermal well according to claim 6, characterized in that: The bottom end of the limiting hoop (9) is fixedly connected to a connecting plate (10), and the connecting plate (10) is bolted to the limiting temperature-conducting ring (8).

8. The heat exchange casing for a medium-deep geothermal well according to claim 1, characterized in that: The bottom end of the installation pipe (201) is fixedly connected to a labyrinth snap-fit ​​block (11), which is snapped into the main pipe (1). The top of the labyrinth snap-fit ​​block (11) is provided with a sealing groove, and a sealing strip (12) is fixedly connected inside the sealing groove. The inside of the sealing strip (12) is in contact with a squeezing block (13), and the squeezing block (13) is fixedly connected to the top end of the main pipe (1).

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