Air heat exchanger with built-in separating device

Abstract

This invention discloses an air heat exchanger with a built-in separation device, comprising a front end cap, a tube box, a shell, and a rear end cap. The first end of the shell is connected to the tube box, the second end of the shell is connected to the rear end cap, and the front end cap is connected to the tube box. U-shaped heat exchange tubes are arranged inside the shell, with both ends of the U-shaped heat exchange tubes connected to a tube sheet. The tube sheet is located between the tube box and the shell. A partition plate is installed inside the shell to divide the tube pass into two flows. An air inlet is located at the top of the tube box, and an air outlet is located at the bottom of the tube box. A gas-liquid separation device is installed inside the tube box adjacent to the air outlet. A fluid outlet is located at the top of the shell, and a fluid inlet is located at the bottom of the shell. The gas-liquid separation device includes a filter screen and a drain valve. The filter screen is arranged at the air outlet to separate gas and liquid, and the drain valve is arranged on the pipe at the air outlet to discharge condensate. The air heat exchanger with a built-in separation device provided by this invention has the advantages of integrating heat exchange and gas-liquid separation functions, improving heat exchange efficiency, and ensuring safe operation.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and more particularly to an air heat exchanger with a built-in separation device. Background Technology

[0002] Building a new power system based on new energy sources is an important means to achieve dual-carbon goals, and energy storage technology is one of the key technologies supporting my country's large-scale development of new energy sources and ensuring energy security. In large-capacity compressed air energy storage systems, heat exchangers, as one of the core components, undertake the important tasks of energy conversion and temperature regulation.

[0003] In compressed air energy storage systems, the compression side consists of multiple compressors and interstage heat exchangers. Generally, no heat storage heat exchanger is installed after the final compressor stage. The energy storage medium in compressed air energy storage systems is humid air. When the humid air cools down to its dew point temperature, condensation occurs, causing corrosion to the heat exchangers and compressors. High-speed droplets entering the compressor can damage critical components such as blades. Current solutions involve installing independent gas-liquid separators after the heat exchangers and before the air storage tank to separate the liquid water from the air. However, this increases system complexity, installation space, and total equipment investment, and also raises the risk of leakage at connection points, leading to additional pressure drop and heat loss.

[0004] To address this, the present invention specifically designs an air heat exchanger with a built-in gas-liquid separation device for separating moisture from humid air in front of the gas storage tank, realizing the dual functions of heat exchange and moisture separation from humid air, reducing equipment investment, improving system efficiency, and achieving a compact, efficient, and low-cost integrated design. Summary of the Invention

[0005] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0006] The heat exchanger lacks gas-liquid separation capability.

[0007] The present invention aims to at least partially solve one of the technical problems in the related art.

[0008] To address this, embodiments of the present invention provide an air heat exchanger with a built-in separation device, comprising a front end cap, a tube box, a shell, and a rear end cap. A first end of the shell is connected to the tube box, a second end of the shell is connected to the rear end cap, and the front end cap is connected to the tube box. U-shaped heat exchange tubes are arranged within the shell, with both ends of the U-shaped heat exchange tubes connected to a tube sheet. The tube sheet is located between the tube box and the shell. A partition plate is provided within the shell to divide the tube pass into two flows. An air inlet is provided at the top of the tube box, and an air outlet is provided at the bottom of the tube box. A gas-liquid separation device is provided within the tube box adjacent to the air outlet. A fluid outlet is provided at the top of the shell, and a fluid inlet is provided at the bottom of the shell. The gas-liquid separation device includes a filter screen and a drain valve. The filter screen is arranged at the air outlet to separate gas and liquid, and the drain valve is arranged on the pipe at the air outlet to discharge condensate.

[0009] The present invention provides the technical effects of integrating heat exchange and gas-liquid separation, improving heat exchange efficiency, and ensuring safe operation.

[0010] In some embodiments, a guide plate is further included, which is obliquely arranged above the filter screen, and the angle between the guide plate and the inner wall of the tube box is 30°-45°.

[0011] In some embodiments, the surface of the guide plate is provided with a hydrophobic coating, and the lower end of the guide plate extends to near the upper edge of the filter screen.

[0012] In some embodiments, the system further includes an annular channel, on which a first opening and a second opening are provided. The first opening is adjacent to the filter screen to receive airflow, and the second opening is connected to the air outlet. The inner wall of the annular centrifugal channel is provided with a spiral guide groove, the pitch of which gradually decreases along the airflow direction.

[0013] In some embodiments, the guide plate, the filter screen, and the annular centrifugal channel are arranged sequentially at the air outlet along the airflow direction, and a buffer gap is provided between the guide plate, the filter screen, and the annular centrifugal channel.

[0014] In some embodiments, the buffer distance between the guide plate and the filter screen is 15-20 cm, and the buffer distance between the filter screen and the annular centrifugal channel is 10-15 cm. In some embodiments, a scraper and a drive shaft are provided at the edge of the filter screen. The scraper abuts against the filter screen, and the drive shaft abuts against the edge of the filter screen to drive the filter screen to rotate.

[0015] In some embodiments, the scraper includes a bent portion and a connecting portion, the connecting portion being perpendicular to the filter screen, one end of the bent portion being connected to the connecting portion, and the other end of the bent portion being bent toward the surface of the filter screen and at least part of the bent portion abutting against the filter screen.

[0016] In some embodiments, a drive motor and a differential pressure sensor are also included. The drive motor is disposed on the outside of the pipe box and is connected to the drive shaft for transmission. The differential pressure sensor is arranged on both sides of the filter screen to detect the pressure difference.

[0017] In some embodiments, a support structure is also included, which includes a fixed support and a sliding support. The fixed support is connected to the bottom of the tube sheet, and the sliding support is connected to the housing and abuts against the ground through a bottom pulley.

[0018] This application offers the following advantages: A guide plate, angled and positioned above the filter screen, separates droplets and airflow, reducing the filter screen's separation load. The guide plate surface is coated with a hydrophobic layer and extends downwards to near the filter screen's edge, accelerating droplet sliding while preventing secondary droplet entrainment. An annular centrifugal channel utilizes a spiral guide groove for centrifugal separation, improving droplet separation efficiency. Buffer spacing between the guide plate, filter screen, and annular centrifugal channel creates a tiered structure to prevent secondary droplet entrainment. Different buffer spacing sizes optimize airflow transition. A scraper and drive shaft are located at the filter screen edge to prevent clogging and maintain separation efficiency. A bent section fits snugly against the filter screen surface, increasing the contact area and ensuring uniform scraping force, preventing localized clogging. A differential pressure sensor detects the degree of clogging to ensure filter permeability. A sliding support is connected to the housing via bottom pulleys to accommodate axial thermal expansion. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an air heat exchanger with a built-in separation device according to an embodiment of the present invention.

[0020] Figure 2 This is a side view schematic diagram of an air heat exchanger with a built-in separation device according to an embodiment of the present invention.

[0021] Figure 3 This is a top view schematic diagram of an air heat exchanger with a built-in separation device according to an embodiment of the present invention.

[0022] Reference numerals: 1. Manhole; 2. Front head; 3. Air inlet; 4. Tube box; 5. Tube sheet; 6. Fluid outlet; 7. Shell; 8. Rear head; 9. Sliding support; 10. Fluid inlet; 11. Fixed support; 12. Air outlet; 13. Gas-liquid separator. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] An embodiment of the present invention provides an air heat exchanger with a built-in separation device, including a front end cap 2, a tube box 4, a shell 7, and a rear end cap 8. The first end of the shell 7 is connected to the tube box 4, the second end of the shell 7 is connected to the rear end cap 8, the front end cap 2 is connected to the tube box 4, U-shaped heat exchange tubes are arranged inside the shell 7 and both ends of the U-shaped heat exchange tubes are connected to a tube sheet 5. The tube sheet 5 is located between the tube box 4 and the shell 7. A partition plate is provided inside the shell 7 to divide the tube pass into two flows. An air inlet 3 is provided at the top of the tube box 4, and an air outlet 12 is provided at the bottom of the tube box 4. A gas-liquid separation device is provided inside the tube box 4 adjacent to the air outlet 12. A fluid outlet 6 is provided at the top of the shell 7, and a fluid inlet 10 is provided at the bottom of the shell 7. The gas-liquid separation device includes a filter screen and a drain valve. The filter screen is arranged at the air outlet 12 to separate gas and liquid, and the drain valve is arranged on the pipe of the air outlet 12 to discharge condensate.

[0025] The front end cap 2, tube box 4, shell 7, and rear end cap 8 form a completely sealed heat exchange chamber. The two ends of the shell 7 are securely connected to the tube box 4 and rear end cap 8, respectively. The front end cap 2, in conjunction with the tube box 4, achieves sealed flow guidance of the tube-side fluid, ensuring no fluid leakage during heat exchange and guaranteeing the equipment's airtight operation. U-shaped heat exchange tubes are arranged inside the shell 7 and fixedly connected at both ends to the tube sheet 5. The tube sheet 5 is located between the tube box 4 and the shell 7, positioning and fixing the U-shaped heat exchange tubes and separating the tube-side and shell-side spaces. The partition plate divides the tube side into two flows, making the fluid flow state inside the tubes closer to pure counter-current flow, increasing the effective heat exchange temperature difference of a single heat exchanger, reducing the required effective heat exchange area, and lowering costs. The air inlet 3 at the top of the tube box 4 and the air outlet 12 at the bottom form a reasonable fluid flow path. Combined with the U-shaped heat exchange tubes inside the shell 7, this allows humid air to flow fully through the heat exchange tubes for heat exchange. A gas-liquid separator installed near the air outlet 12 inside the tube box 4 can dehydrate the humid air after heat exchange, eliminating the need for an additional independent gas-liquid separator and connecting pipes. The fluid outlet 6 at the top of the shell 7 and the fluid inlet 10 at the bottom form a counter-current flow channel for the shell-side fluid, enabling efficient convective heat exchange between the shell-side fluid and the humid air inside the tubes, thus improving heat exchange efficiency. A filter screen in the gas-liquid separator is arranged at the air outlet 12, allowing liquid water in the humid air to impact and accumulate as it flows through the filter screen. Utilizing the density difference between gas and liquid, the droplets naturally settle, separating the water and ensuring that the air entering the gas storage tank or the next stage of equipment is dry air. This prevents droplets from impacting and damaging the compressor blades and reduces corrosion of the equipment by humid air. A drain valve on the air outlet 12 pipe can promptly discharge the condensate formed by settling, preventing backflow of condensate from affecting heat exchange or separation efficiency. Manhole 1 is located on the front end cap 2 and the rear end cap 8 for easy maintenance.

[0026] In some embodiments, a guide plate is also included, which is inclinedly arranged above the filter screen, and the angle between the guide plate and the inner wall of the tube box 4 is 30°-45°.

[0027] Specifically, a guide plate with an angle of 30°-45° is inclinedly arranged above the filter screen inside the tube box 4. This utilizes the inertia of the humid airflow to guide the airflow smoothly towards the filter screen below, preventing direct impact from the airflow onto the filter screen and avoiding excessively high local flow velocities and uneven separation. Large droplets in the humid air, under the combined action of inertia and gravity, gather and fall along the inclined surface of the guide plate, achieving early separation of some coarse droplets to reduce the separation load on the filter screen and improve gas-liquid separation efficiency. The guide plate also acts as a flow straightener, making the airflow distribution in the filter area more uniform and preventing secondary droplet entrainment due to local airflow turbulence. Optionally, the inclination angle of the guide plate can be adjusted according to the operating conditions. When the air humidity is high and the droplet content is large, the angle can be adjusted to close to 45° to accelerate the settling speed of large droplets; when the air velocity is high, the angle can be adjusted to close to 30° to reduce airflow resistance.

[0028] In some embodiments, the surface of the deflector is provided with a hydrophobic coating, and the lower end of the deflector extends to near the upper edge of the filter screen.

[0029] Specifically, a hydrophobic coating is applied to the surface of the guide plate to reduce the adhesion between droplets and the plate surface, preventing droplets from forming a continuous liquid film or leaving residue. This allows the accumulated droplets to slide off the plate surface, reducing the possibility of droplets evaporating and re-mixing into the airflow, thus lowering the risk of corrosion to the guide plate. The lower end of the guide plate extends to near the upper edge of the filter screen, forming a smooth airflow channel from the guide plate to the filter screen. This prevents airflow eddies caused by excessive spacing from drawing the sliding droplets back into the airflow. The airflow, rectified by the guide plate, is directly guided to the separation area of ​​the filter screen, ensuring uniform airflow through the filter screen and improving the separation effect. Polytetrafluoroethylene (PTFE) or nano-hydrophobic materials are selected as the coating material, which not only has excellent hydrophobic properties but also good corrosion resistance and wear resistance.

[0030] Optionally, an arc-shaped transition structure can be provided at the lower edge of the guide plate to avoid airflow disturbance or droplet splashing caused by sharp edges, while allowing the sliding droplets to flow smoothly along the arc-shaped edge towards the air outlet 12 pipe.

[0031] In some embodiments, an annular channel is further included, with a first opening and a second opening provided on the annular centrifugal channel. The first opening is adjacent to the filter screen to receive airflow, and the second opening is connected to the air outlet 12. The inner wall of the annular centrifugal channel is provided with a spiral guide groove, and the pitch of the guide groove gradually decreases along the airflow direction.

[0032] Specifically, the annular centrifugal channel forms a two-stage gas-liquid separation path through the first opening adjacent to the filter screen, involving filter interception and centrifugal separation. The airflow, after initial separation by the filter screen, smoothly enters the annular channel, avoiding eddies or excessive pressure drops at turning points. The spiral guide channel guides the airflow to rotate along the channel, using centrifugal force to throw the tiny droplets that were not completely separated by the filter screen against the inner wall of the channel, achieving secondary separation. The pitch of the guide channel gradually decreases along the airflow direction, increasing the rotational speed and centrifugal force as the airflow advances, effectively separating even smaller droplets.

[0033] Optionally, the annular centrifugal channel is made of wear-resistant and corrosion-resistant stainless steel, and the inner wall and spiral guide groove surface are coated with a hydrophobic coating to reduce the adhesion and residue of droplets in the channel.

[0034] In some embodiments, the baffle, filter screen and annular centrifugal channel are arranged sequentially at the air outlet 12 along the air flow direction, and buffer gaps are provided between the baffle, filter screen and annular centrifugal channel.

[0035] Specifically, the guide plate, filter screen, and annular centrifugal channel form a staged gas-liquid separation process, including primary inertial separation, filter interception, and centrifugal dehydration. This allows the humid air to gradually complete moisture separation, avoiding incomplete dehydration caused by excessive load on a single stage. The three components work together to reduce local airflow obstruction and pressure drop losses. Buffer gaps are provided between each component to offer transition space for the separated airflow, preventing direct impact on the next stage separation element and preventing droplets from the previous stage from being re-entrained by the airflow, thus improving separation efficiency.

[0036] Optionally, a shallow trough is provided on the inner wall of the tube box 4 in the buffer gap area to collect a small amount of droplets that slide off the guide plate or fall off the filter screen. These droplets are then guided to the air outlet 12 pipe through the drainage channel to reduce the retention and evaporation backflow of droplets in the buffer area.

[0037] In some embodiments, the buffer gap between the guide plate and the filter screen is 15-20cm, and the buffer gap between the filter screen and the annular centrifugal channel is 10-15cm.

[0038] Specifically, the buffer gap between the guide plate and the filter screen provides transition space for the airflow after primary separation by the guide plate, preventing large-diameter droplets that have not fully settled from directly impacting the filter screen and preventing excessively small gaps from causing airflow turbulence and increased pressure drop. Droplets sliding off the guide plate have sufficient distance to fall into the air outlet 12 pipe. The buffer gap between the filter screen and the annular centrifugal channel ensures that the airflow after being intercepted and separated by the filter screen achieves uniform flow velocity before entering the annular channel, preventing excessively fast local airflow or eddies from affecting the centrifugal separation effect. It also prevents tiny droplets detached from the filter screen surface from being directly sucked into the annular channel.

[0039] Optionally, guide vanes can be added within the buffer gap between the filter and the annular centrifugal channel. The vanes are arranged at an angle along the airflow direction to comb the airflow, so that the airflow enters the spiral guide groove of the annular centrifugal channel with a more stable flow rate and direction.

[0040] In some embodiments, a scraper and a drive shaft are provided at the edge of the filter screen. The scraper abuts against the filter screen, and the drive shaft abuts against the edge of the filter screen to drive the filter screen to rotate.

[0041] Specifically, a scraper is installed and drives the filter screen to rotate via a drive shaft, forming a self-cleaning mechanism. The drive shaft, in contact with the edge of the filter screen, smoothly drives the screen to rotate at a uniform speed, ensuring the scraper remains in effective contact with the screen surface. During the screen's rotation, it continuously scrapes away adhering liquid films, impurities, and small droplets, preventing clogging and reducing separation efficiency, thus minimizing manual cleaning and lowering maintenance costs. The tight contact between the scraper and the screen prevents impurities from accumulating and solidifying in the screen pores, maintaining the screen's permeability.

[0042] The drive shaft is connected to the drive motor on the outside of the housing 4 via a coupling, enabling the filter screen to rotate smoothly at low speed and avoiding airflow disturbance caused by high-speed rotation. The scraper is made of wear-resistant rubber or PTFE, ensuring effective scraping without damaging the filter screen surface and ensuring a tight fit even when the filter screen is slightly deformed. A sludge collection tank is installed below the scraper to collect scraped impurities and droplets. The sludge collection tank is periodically drained to prevent secondary contamination of the filter screen or the inside of the housing 4.

[0043] In some embodiments, the scraper includes a bent portion and a connecting portion, the connecting portion being perpendicular to the filter screen, one end of the bent portion being connected to the connecting portion, and the other end of the bent portion being bent toward the surface of the filter screen and at least part of the bent portion abutting against the filter screen.

[0044] Specifically, the connecting part, perpendicular to the filter screen, provides support for the bending part, ensuring the overall structural strength of the scraper and preventing deformation or displacement due to force during filter screen rotation. The bending part bends towards the filter screen surface and at least partially abuts against the filter screen, allowing the bending part to form a scraping contact surface that fits the filter screen surface, increasing the contact area between the scraper and the filter screen, and enabling the cleaning of dead corners where dirt easily accumulates, such as the edges of the filter screen.

[0045] Optionally, the bending angle of the bending part is 15°-30°, which reduces the obstruction of airflow while ensuring the scraping force, and the free end of the bending part is rounded to avoid scratching the filter surface.

[0046] In some embodiments, a drive motor and a differential pressure sensor are also included. The drive motor is located outside the pipe box 4 and is connected to the drive shaft for transmission. The differential pressure sensor is arranged on both sides of the filter screen to detect the pressure difference.

[0047] Specifically, the drive motor is located on the outside of the tube box 4 and connected to the drive shaft, avoiding direct contact between the motor and the humid air and condensate inside the tube box 4. Through stable transmission, it drives the filter screen to rotate at a uniform speed, providing continuous power for the scraping action of the scraper. Differential pressure sensors are arranged on both sides of the filter screen to detect the pressure difference before and after the filter screen, directly reflecting the degree of clogging and preventing untimely cleaning. When the pressure difference across the filter screen reaches a set threshold due to impurities, the drive motor automatically starts, causing the filter screen to rotate, allowing the scraper to efficiently remove the deposits from the filter screen surface. Once the pressure difference drops to a safe range, the motor automatically stops, ensuring the filter screen remains open and maintains separation efficiency.

[0048] In some embodiments, a support structure is also included, which includes a fixed support 11 and a sliding support 9. The fixed support 11 is connected to the bottom of the tube sheet 5, and the sliding support 9 is connected to the housing 7 and abuts against the ground through a bottom pulley.

[0049] Specifically, the fixed support 11 in the support structure provides positioning support for the heat exchanger, restricting the radial and axial displacement of the equipment, avoiding overall displacement caused by impact or vibration during operation, and ensuring sealing. The sliding support 9 is connected to the shell 7 and abuts against the ground through the bottom pulley. It not only bears part of the weight load of the shell 7, but also reduces the frictional resistance when the shell 7 moves axially. When the heat exchanger expands or contracts due to temperature changes during operation, the sliding support 9 can slide smoothly along the ground to achieve axial displacement compensation, offset the pulling or squeezing of thermal stress on the shell 7, tube sheet 5 and pipe connections, and prevent weld cracking, sealing failure and other faults.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 this 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. Therefore, they should not be construed as limitations on this invention.

[0051] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An air heat exchanger with a built-in separation device, characterized in that, include: The system comprises a front end cap, a tube box, a shell, and a rear end cap. The first end of the shell is connected to the tube box, and the second end of the shell is connected to the rear end cap. The front end cap is connected to the tube box. U-shaped heat exchange tubes are arranged inside the shell, and both ends of the U-shaped heat exchange tubes are connected to the tube sheet. The tube sheet is located between the tube box and the shell. A partition plate is installed inside the shell to divide the tube pass into two flows. An air inlet is provided at the top of the tube box, and an air outlet is provided at the bottom of the tube box. A gas-liquid separation device is installed inside the tube box adjacent to the air outlet. A fluid outlet is provided at the top of the shell, and a fluid inlet is provided at the bottom of the shell. The gas-liquid separation device includes a filter screen and a condensate drain valve. The filter screen is arranged at the air outlet to separate gas and liquid, and the condensate drain valve is arranged on the pipe at the air outlet to discharge condensate.

2. The air heat exchanger with a built-in separation device according to claim 1, characterized in that, It also includes a guide plate, which is inclinedly arranged above the filter screen, and the angle between the guide plate and the inner wall of the tube box is 30°-45°.

3. The air heat exchanger with a built-in separation device according to claim 2, characterized in that, The surface of the guide plate is provided with a hydrophobic coating, and the lower end of the guide plate extends to near the upper edge of the filter screen.

4. The air heat exchanger with a built-in separation device according to claim 2, characterized in that, It also includes an annular channel, on which a first opening and a second opening are provided. The first opening is adjacent to the filter screen to receive airflow, and the second opening is connected to the air outlet. The inner wall of the annular centrifugal channel is provided with a spiral guide groove, the pitch of which gradually decreases along the airflow direction.

5. The air heat exchanger with a built-in separation device according to claim 4, characterized in that, The guide plate, the filter screen, and the annular centrifugal channel are arranged sequentially at the air outlet along the air flow direction, and buffer gaps are provided between the guide plate, the filter screen, and the annular centrifugal channel.

6. The air heat exchanger with a built-in separation device according to claim 5, characterized in that, The buffer distance between the guide plate and the filter screen is 15-20cm, and the buffer distance between the filter screen and the annular centrifugal channel is 10-15cm.

7. The air heat exchanger with a built-in separation device according to claim 1, characterized in that, The filter screen is provided with a scraper and a drive shaft at its edge. The scraper abuts against the filter screen, and the drive shaft abuts against the edge of the filter screen to drive the filter screen to rotate.

8. The air heat exchanger with a built-in separation device according to claim 7, characterized in that, The scraper includes a bent portion and a connecting portion. The connecting portion is perpendicular to the filter screen. One end of the bent portion is connected to the connecting portion, and the other end of the bent portion is bent toward the surface of the filter screen and at least part of the bent portion abuts against the filter screen.

9. The air heat exchanger with a built-in separation device according to claim 1, characterized in that, It also includes a drive motor and a differential pressure sensor. The drive motor is located on the outside of the pipe box and is connected to the drive shaft. The differential pressure sensor is arranged on both sides of the filter screen to detect the pressure difference.

10. The air heat exchanger with a built-in separation device according to claim 1, characterized in that, It also includes a support structure, which includes a fixed support and a sliding support. The fixed support is connected to the bottom of the tube sheet, and the sliding support is connected to the housing and abuts against the ground through a bottom pulley.

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