A spiral plate heat exchanger

Abstract

The application discloses a spiral plate heat exchanger, and belongs to the technical field of heat exchange equipment. The spiral plate heat exchanger comprises a tank body, a spiral plate flow channel, a middle shaft through pipe arranged in the tank body, a spiral plate flow channel sleeved on the outer wall of the middle shaft through pipe, a gas filter plate and a bearing plate respectively sleeved on the upper and lower ends of the spiral plate flow channel, a left flow channel and a right flow channel arranged in the middle shaft through pipe, a geothermal flow channel and a clean flow channel arranged in the spiral plate flow channel, a first through hole and a second through hole formed in the side wall of the middle shaft through pipe, a liquid filter plate connected with one end of the geothermal flow channel, a clean output end, a geothermal output end and an impurity output end formed in the side wall of the tank body, and the first through hole and the impurity output end located between the liquid filter plate and the bearing plate. The spiral plate heat exchanger can intercept solid impurities through the liquid filter plate, and discharge the solid impurities from the tank body in line or continuously through the impurity output end, thereby prolonging the continuous operation period of the equipment. The gas filter plate arranged at the top of the spiral plate flow channel can collect gas.

Description

Technical Field

[0001] This application belongs to the technical field of heat exchange equipment, and specifically relates to a spiral plate heat exchanger. Background Technology

[0002] Spiral plate heat exchangers are a typical high-efficiency indirect heat exchange device. Their core is a pair of concentric spiral channels made of two parallel metal plates rolled together. Two fluids with a temperature difference flow in opposite directions in their respective channels, exchanging heat through the metal plate walls. Since the flow channels are single rectangular channels with no dead zones, the high-speed flow of the fluid inside has a certain scouring effect on the wall surface, which can prevent fouling and has a certain anti-scaling ability.

[0003] However, traditional spiral plate heat exchangers rely on fluid flushing to prevent scaling. However, in complex geothermal fluid environments, traditional spiral plate heat exchangers lack built-in filtration and discharge mechanisms. This allows newly precipitated fine crystalline scale (such as calcium carbonate) and impurities carried by the geothermal fluid to adhere to the spacer columns and plates, leaving the exchanger to passively endure scaling until the scale thickens, causing flow channel blockage and a sharp drop in heat exchange efficiency. Ultimately, offline cleaning is necessary, leading to production interruptions and a complex and costly cleaning process that severely impacts the equipment's continuous operational reliability, stability, and lifespan.

[0004] Meanwhile, the dissolved gases released by the geothermal fluid during the heat exchange process will accumulate at the top of the flow channel due to the density difference, forming a "gas resistance effect" that occupies the effective heat exchange area, causing some heat exchange surfaces to fail and the overall heat transfer efficiency to decrease significantly. In addition, if these non-condensable gases enter downstream pipelines and equipment with the fluid, they may also cause cavitation damage.

[0005] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a spiral plate heat exchanger, comprising: a tank, a spiral plate flow channel, and a central axial pipe. The central axial pipe is arranged coaxially with the tank body, and the spiral plate flow channel is sleeved on the outer wall of the central axial pipe. Gas filter plates and a support plate are respectively sleeved at the upper and lower ends of the spiral plate flow channel. A dividing plate is provided inside the central axial pipe to form a left flow channel and a right flow channel. Both ends of the central axial pipe penetrate the tank body, so that the upper end of the left flow channel and the lower end of the right flow channel are connected to the outside. The spiral plate flow channel is equipped with geothermal flow channels and clean flow channels arranged in a spiral stack. The side wall of the central through pipe is provided with a first through hole connecting the geothermal flow channel and the left flow channel, and a second through hole connecting the clean flow channel and the right flow channel. The end of the geothermal flow channel facing the support plate is connected to the liquid filter plate. The side wall of the tank is provided with a clean output end that connects to the clean flow channel, a geothermal output end that connects to the geothermal flow channel, and an impurity output end. The first through hole and the impurity output end are located between the liquid filter plate and the support plate.

[0007] Furthermore, the geothermal output end, the clean output end, and the second through hole are all located between the liquid filter plate and the gas filter plate. The geothermal output end and the clean output end maintain the same height, and both the geothermal output end and the clean output end maintain a predetermined distance from the gas filter plate.

[0008] Furthermore, the height of the middle part of the upper surface of the bearing plate is greater than the height of the edge of the upper surface of the bearing plate.

[0009] Furthermore, the pore size of the liquid filter plate gradually decreases along the path of the geothermal flow channel from the inner ring to the outer ring.

[0010] Furthermore, a through hole is made in the side wall of the liquid filter plate corresponding to the impurity output end, and the port diameter of the through hole facing the impurity output end is smaller than the port diameter of the through hole facing the geothermal output end.

[0011] Furthermore, several flow dividers are provided above the liquid filter plate, and these flow dividers are arranged at equal intervals along the geothermal flow path.

[0012] Furthermore, the cross-section of the diversion baffle adopts a triangular structure.

[0013] Furthermore, the inner wall of the tank is provided with several flow guide baffles arranged in a circular array. The flow guide baffles are located between the second through hole and the gas filter plate. One side of the flow guide baffle is connected to the inner wall of the tank, and the other side of the flow guide baffle extends horizontally towards the central through pipe. The flow guide baffles are arranged in a structure with a low front end and a high rear end according to the geothermal flow path.

[0014] Furthermore, the top surface inside the tank and the gas filter plate, as well as the bottom surface inside the tank and the support plate, maintain a predetermined distance.

[0015] Furthermore, a pressure reducing valve is provided on the side wall of the tank, with the input end of the pressure reducing valve located between the top surface inside the tank and the gas filter plate.

[0016] Compared with the prior art, this application has the following advantages: 1. The spiral plate heat exchanger proposed in this application, by setting liquid filter plates and independent impurity output end at the bottom of the spiral plate flow channel, allows the geothermal fluid carrying precipitated impurities to be intercepted by the liquid filter plates before flowing out of the geothermal flow channel. The purified geothermal fluid then flows to the geothermal output end. The intercepted impurities settle under gravity and can be discharged from the inner cavity of the tank online or continuously through the impurity output end, thereby greatly extending the continuous operation cycle of the equipment and ensuring the stability of geothermal energy exchange of the device. 2. A gas filter plate is installed at the top of the spiral plate flow channel, and a gas phase collection chamber is formed on it. This allows the gas to rise in the flow channel and pass through the gas filter plate, where droplets in the gas are intercepted. This allows the dry gas to accumulate in the top chamber, preventing the gas from affecting the fluidization and heating operation again, thus achieving gas collection.

[0017] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a spiral plate heat exchanger in an embodiment of the present invention is shown; Figure 2 A front view schematic diagram of a spiral plate heat exchanger in an embodiment of the present invention is shown; Figure 3 A cross-sectional schematic diagram of a spiral plate heat exchanger in an embodiment of the present invention is shown; Figure 4 It shows Figure 3 An enlarged schematic diagram of structure A in the middle.

[0020] In the diagram, 1. Tank body; 2. Spiral plate flow channel; 201. Geothermal flow channel; 202. Clean flow channel; 3. Central shaft pipe; 301. Left flow channel; 302. Right flow channel; 303. First through hole; 304. Second through hole; 4. Gas filter plate; 5. Support plate; 6. Liquid filter plate; 7. Geothermal output end; 8. Impurity output end; 9. Clean output end; 10. Through hole; 11. Diverting baffle; 12. Flow guide baffle; 13. Pressure reducing valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] This invention provides a spiral plate heat exchanger. Figure 1 A schematic diagram of a spiral plate heat exchanger according to an embodiment of the present invention is shown, with reference to... Figure 3 Specifically, it includes: a tank body 1, a spiral plate flow channel 2, and a central axial pipe 3. The tank body 1 is provided with a central axial pipe 3 arranged coaxially. The spiral plate flow channel 2 is sleeved on the outer wall of the central axial pipe 3. The central axial pipe 3 serves as the input pipeline for external geothermal fluid and heat exchange fluid. The spiral plate flow channel 2 and the central axial pipe 3 form a heat exchange zone. The spiral plate flow channel 2 is composed of two bolted structural plates arranged in a spiral stack, which forms a geothermal flow channel 201 and a clean flow channel 202 arranged in a spiral stack to realize the heat exchange between the internal and external geothermal flow channels 201 and the clean flow channel 202.

[0023] The upper and lower ends of the spiral plate flow channel 2 are respectively fitted with gas filter plate 4 and support plate 5. The space between the gas filter plate 4 and the top of the tank 1 forms a cavity for collecting gas, and the space between the support plate 5 and the liquid filter plate 6 forms a cavity for collecting impurities, thereby realizing the division of a single complete chamber inside the tank 1.

[0024] The central axial pipe 3 is equipped with a dividing plate to form a left flow channel 301 and a right flow channel 302. Both ends of the central axial pipe 3 penetrate the tank body 1, so that the upper end of the left flow channel 301 and the lower end of the right flow channel 302 are connected to the outside. Correspondingly, the side wall of the central through pipe 3 is provided with a first through hole 303 connecting the geothermal flow channel 201 and the left flow channel 301, and a second through hole 304 connecting the clean flow channel 202 and the right flow channel 302; The geothermal flow channel 201 is connected to the liquid filter plate 6 at one end facing the support plate 5. The side wall of the tank body 1 is provided with a clean output end 9 that connects to the clean flow channel 202, a geothermal output end 7 that connects to the geothermal flow channel 201, and an impurity output end 8. The first through hole 303 and the impurity output end 8 are located between the liquid filter plate 6 and the support plate 5.

[0025] In actual use, the spiral plate heat exchanger of this application allows geothermal fluid to enter from the upper end of the left flow channel 301, while heat exchange fluid enters from the lower end of the right flow channel 302. The geothermal fluid enters the geothermal flow channel 201 in the spiral plate flow channel 2 through the first through hole 303 from the left flow channel 301. At the same time, the heat exchange fluid enters the clean flow channel 202 from the right flow channel 302 through the second through hole 304. The two fluid media flow in opposite directions in the spiral plate flow channel 2 to transfer heat energy.

[0026] It should be further explained that after the geothermal fluid passes through the first through hole 303, it needs to pass through the liquid filter plate 6 to enter the space above the liquid filter plate 6, and then flow out from the geothermal output end 7. This allows the cavity between the liquid filter plate 6 and the support plate 5 to filter the geothermal fluid, and retain impurities that cannot pass through the liquid filter plate 6 in the cavity between the liquid filter plate 6 and the support plate 5. When the impurity output end 8 is opened, the impurities are discharged to the external environment. The geothermal fluid filtered by the liquid filter plate 6 flows along the geothermal flow channel 201 to the geothermal output end 7.

[0027] Meanwhile, as the geothermal fluid flows through the liquid filter plate 6 to the geothermal output end 7, the geothermal fluid and the heat exchange fluid exchange heat. The dissolved gas released due to the temperature and pressure changes of the geothermal fluid rises to the top of the flow channel under the action of buoyancy. When the gas-liquid mixture passes through the gas filter plate 4, for example, the gas filter plate 4 adopts a wire mesh demister. Combined with the fine pore structure of the gas filter plate 4, the liquid droplets entrained in the gas are intercepted, so that the droplets gather on the surface of the gas filter plate 4 and fall back into the liquid flow below due to gravity. This ensures the dryness of the collected gas, reduces the volatilization of the geothermal fluid and the heat exchange fluid, and promotes the dried gas to gather in the cavity at the top.

[0028] This invention, by setting a liquid filter plate 6 and an independent impurity output end 8 at the bottom of the spiral plate flow channel 2, ensures that the geothermal fluid carrying precipitated impurities must pass through the liquid filter plate 6 before flowing out of the geothermal flow channel 201, thus trapping solid impurities. The purified geothermal fluid then flows to the geothermal output end 7. The trapped impurities settle under gravity and can be discharged online or continuously from the inner cavity of the tank 1 through the impurity output end 8, thereby greatly extending the continuous operation cycle of the equipment and ensuring the stability of geothermal energy exchange.

[0029] Meanwhile, a gas filter plate 4 is installed at the top of the spiral plate flow channel 2, and a gas phase collection chamber is formed on it. This allows the precipitated gas to rise in the flow channel and intercept the liquid droplets in the gas as it passes through the gas filter plate 4, thereby allowing the dry gas to accumulate in the top chamber and preventing the gas from affecting the fluidized heat operation again. In actual use, the pressure reducing valve 13 can be used to keep the top chamber under negative pressure to prevent the formation of gas resistance in the tank 1, ensuring the stability of heat exchange efficiency and preventing the downstream equipment from experiencing efficiency reduction due to gas escape.

[0030] As can be seen, the spiral plate heat exchanger proposed in this invention highly integrates the three major functions of heat exchange, gas-liquid separation, and liquid-solid separation into a compact tank. In addition to filtering impurities through the liquid filter plate 6, it filters gases through the gas filter plate 4. Furthermore, the liquid filter plate 6 and the gas filter plate 4 provide collection cavities for solid impurities and excess gases within the tank 1, thereby achieving the filtration of geothermal fluids while buffering impurities and gases, facilitating long-term operation, and effectively solving the problems of scaling and gas blockage in geothermal fluid applications.

[0031] refer to Figure 3 Based on the gas filter plate 4 as the interface for gas-liquid separation and the liquid filter plate 6 as the interface for liquid-solid separation, the geothermal output end 7, the clean output end 9, and the second through hole 304 are all located between the liquid filter plate 6 and the gas filter plate 4. The geothermal output end 7 and the gas filter plate 4 maintain a predetermined distance. By setting a height difference, a static buffer zone is formed between the geothermal output end 7 and the liquid filter plate 6. For geothermal fluid containing a small amount that is not intercepted by the liquid filter plate 6, it settles in this area due to the reduced flow velocity, avoiding direct entry into the geothermal output end 7, thus achieving the effect of secondary filtration of the geothermal fluid. At the same time, it avoids direct contact between the geothermal fluid and the gas filter plate 4, ensuring that the horizontal level of the geothermal fluid is lower than the height of the gas filter plate 4.

[0032] To further ensure that the horizontal plane of the heat exchange fluid is lower than the height of the gas filter plate 4, and at the same time to ensure the maximum efficiency of the corresponding heat exchange, the geothermal output end 7 and the clean output end 9 are set to maintain the same height, and the clean output end 9 and the gas filter plate 4 are kept at a predetermined distance.

[0033] The height of the middle part of the upper surface of the support plate 5 is greater than the height of the edge of the upper surface of the support plate 5, thus forming a structure with a high middle and low edge, so that the upper surface of the support plate 5 presents a sloping structure, which guides the impurities that settle between the liquid filter plate 6 and the support plate 5, making it easier for the impurities to slide to the impurity output end 8 at the edge, and avoiding the accumulation of impurities in the middle of the upper surface of the support plate 5.

[0034] In this embodiment, the aperture of the liquid filter plate 6 gradually decreases along the path of the geothermal flow channel 201 from the inner ring to the outer ring. During actual operation, the first through hole 303 serves as the input port of the geothermal fluid. As the geothermal fluid flows from the central through pipe 3 through the first through hole 303 to the geothermal flow channel 20, the velocity of the geothermal fluid increases dramatically, and then gradually decreases in subsequent flow. In order to prioritize the filtration of large particulate impurities and reduce the impact force of the geothermal fluid on the liquid filter plate 6 at the port of the first through hole 303, the aperture of the liquid filter plate 6 is set to gradually decrease, and the filtration accuracy of the geothermal fluid is gradually improved to adapt to the change in the geothermal fluid velocity from high to low.

[0035] At the same time, refer to Figure 4 In order to further improve the discharge efficiency of geothermal fluid impurities above the liquid filter plate 6, a through hole 10 is opened on the side wall of the liquid filter plate 6 corresponding to the impurity output end 8. The port diameter of the through hole 10 facing the impurity output end 8 is smaller than the port diameter of the through hole 10 facing the geothermal output end 7.

[0036] After heat exchange, the geothermal fluid cools down, causing dissolved impurities (such as calcium carbonate and silicates) to precipitate further. Under gravity, these impurities settle and accumulate on the upper surface of the bottom liquid filter plate 6. Driven by the flow of the geothermal fluid, the impurities are guided to the through-hole 10, where they are discharged periodically or continuously through the impurity outlet 8. This achieves the technical effect of online descaling without shutting down the system, solving the industry problem of frequent shutdowns for cleaning spiral plate heat exchangers due to easy clogging.

[0037] When the impurity output end is opened, while performing the impurity discharge operation between the liquid filter plate 6 and the carrier plate 5, the impurities near the through hole 10 above the liquid filter plate 6 are also discharged.

[0038] The liquid filter plate 6 is provided with several flow dividers 11 above it. The flow dividers 11 are arranged at equal intervals along the geothermal flow channel 201. By dividing the geothermal flow channel 201 above the liquid filter plate 6 with the flow dividers 11, the cross-sectional area of ​​the geothermal flow channel 201 is reduced, the flow velocity of the geothermal fluid is increased, the centrifugal force of the geothermal fluid in the lower half of the geothermal flow channel 201 is strengthened, and the settling efficiency of solid impurities in the geothermal fluid in the lower half of the geothermal flow channel 201 is improved.

[0039] Correspondingly, the cross-section of the diversion baffle 11 adopts a triangular structure, which makes the flow velocity of the geothermal fluid in the lower half of the geothermal channel 201 increase as the height decreases, further improving the settling efficiency of solid impurities in the geothermal fluid in the lower half of the geothermal channel 201.

[0040] The inner wall of the tank 1 is provided with a number of flow guide baffles 12 arranged in a circular array. The flow guide baffles 12 are located between the clean output end 9 and the gas filter plate 4. One side of the flow guide baffles 12 is connected to the inner wall of the tank 1, and the other side of the flow guide baffles 12 extends horizontally towards the central axial pipe 3. The flow guide baffles 12 extend horizontally from the inner wall of the tank 1 towards the center, but are not completely connected to the central axial pipe 3, thus forming an annular gap between the flow guide baffles 12 and the central axial pipe 3, further dividing the space between the gas filter plate 4 and the liquid filter plate 6.

[0041] In the outermost layers of the geothermal flow channel 201 and the clean flow channel 202, the corresponding clean output end 9 and geothermal output end 7 cause oscillations in the fluid medium. The flow guide baffle 12, with its lower front end and higher rear end, is designed according to the path of the geothermal flow channel 201. The flow guide baffle 12 locally blocks the medium in the geothermal flow channel 201 and the clean flow channel 202, preventing the fluid medium from directly splashing onto the gas filter plate 4. The inclined structure of the flow guide baffle 12 effectively prevents droplets from splashing upwards directly. After impacting the inclined surface of the flow guide baffle 12, the droplets flow along the inclined surface and coalesce. Simultaneously, the inclined structure of the flow guide baffle 12 guides the airflow to flow more smoothly upwards towards the gas filter plate 4, further promoting gas-liquid separation and improving the final separation effect and efficiency of the top gas filter plate 4.

[0042] In this embodiment, the top surface inside the tank 1 and the gas filter plate 4, and the bottom surface inside the tank 1 and the support plate 5 are all kept at a predetermined distance, so that the upper and lower ends of the spiral plate flow channel 2 are both cavities, reducing heat leakage and thus reducing the heat loss of geothermal fluid.

[0043] At the same time, refer to Figure 2 A pressure reducing valve 13 is provided on the side wall of the tank body 1. The input end of the pressure reducing valve 13 is located between the top surface inside the tank body 1 and the gas filter plate 4, and is used to detect and release the air pressure between the top surface inside the tank body 1 and the gas filter plate 4.

[0044] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they may refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0045] It should be understood that all terms used to indicate orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as a limitation of the present invention.

[0046] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A spiral plate heat exchanger, characterized in that, include: Tank body (1), spiral plate flow channel (2), central axis pipe (3), the tank body (1) is provided with a central axis pipe (3) arranged coaxially with the tank body (1), the spiral plate flow channel (2) is sleeved on the outer wall of the central axis pipe (3), the upper and lower ends of the spiral plate flow channel (2) are respectively sleeved with gas filter plate (4) and bearing plate (5), the central axis pipe (3) is provided with a dividing plate to form a left flow channel (301) and a right flow channel (302), both ends of the central axis pipe (3) penetrate the tank body (1), so that the upper end of the left flow channel (301) and the lower end of the right flow channel (302) are connected to the outside; The spiral plate channel (2) is provided with a geothermal channel (201) and a clean channel (202) arranged in a spiral stack. The side wall of the central axis pipe (3) is provided with a first through hole (303) connecting the geothermal channel (201) and the left channel (301), and a second through hole (304) connecting the clean channel (202) and the right channel (302). The geothermal flow channel (201) is connected to the liquid filter plate (6) at one end facing the support plate (5). The side wall of the tank (1) is provided with a clean output end (9) that connects to the clean flow channel (202), a geothermal output end (7) that connects to the geothermal flow channel (201), and an impurity output end (8). The first through hole (303) and the impurity output end (8) are located between the liquid filter plate (6) and the support plate (5).

2. The spiral plate heat exchanger according to claim 1, characterized in that, The geothermal output end (7), the clean output end (9), and the second through hole (304) are all located between the liquid filter plate (6) and the gas filter plate (4). The geothermal output end (7) and the clean output end (9) maintain the same height, and the geothermal output end (7) and the clean output end (9) maintain a predetermined distance from the gas filter plate (4).

3. The spiral plate heat exchanger according to claim 1, characterized in that, The height of the middle part of the upper surface of the bearing plate (5) is greater than the height of the edge of the upper surface of the bearing plate (5).

4. The spiral plate heat exchanger according to claim 1, characterized in that, The aperture of the liquid filter plate (6) gradually decreases along the path of the geothermal channel (201) from the inner ring to the outer ring.

5. The spiral plate heat exchanger according to claim 4, characterized in that, The sidewall of the liquid filter plate (6) has a through hole (10) corresponding to the impurity output end (8). The port diameter of the through hole (10) facing the impurity output end (8) is smaller than the port diameter of the through hole (10) facing the geothermal output end (7).

6. The spiral plate heat exchanger according to claim 5, characterized in that, The liquid filter plate (6) is provided with several flow dividers (11) above it, and the flow dividers (11) are arranged at equal intervals along the path of the geothermal channel (201).

7. The spiral plate heat exchanger according to claim 6, characterized in that, The cross-section of the diversion baffle (11) is triangular.

8. The spiral plate heat exchanger according to claim 1, characterized in that, The inner wall of the tank (1) is provided with a plurality of flow guide baffles (12) arranged in a circular array. The flow guide baffles (12) are located between the second through hole (304) and the gas filter plate (4). One side of the flow guide baffles (12) is connected to the inner wall of the tank (1), and the other side of the flow guide baffles (12) extends horizontally to the side of the central through pipe (3). The flow guide baffles (12) are arranged in a structure with a low front end and a high rear end according to the path of the geothermal flow channel (201).

9. The spiral plate heat exchanger according to any one of claims 1 to 8, characterized in that, The inner top surface of the tank (1) and the gas filter plate (4), and the inner bottom surface of the tank (1) and the support plate (5) maintain a predetermined distance.

10. The spiral plate heat exchanger according to claim 9, characterized in that, The tank (1) is provided with a pressure reducing valve (13) on its side wall. The input end of the pressure reducing valve (13) is located between the top surface inside the tank (1) and the gas filter plate (4).

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