Coal carbonization black water waste heat recovery plate heat exchanger

Abstract

This application discloses a plate heat exchanger for recovering waste heat from coal chemical black water, including a frame and a heat-conducting assembly installed on the frame. The heat-conducting assembly has a first heat exchange channel for black water flow and a second heat exchange channel for heat exchange medium flow. The heat-conducting assembly is composed of multiple heat-conducting plates sequentially spliced ​​together. Each heat-conducting plate has a first through hole and a second through hole. The multiple first through holes are aligned to form the first heat exchange channel, and the multiple second through holes are aligned to form the second heat exchange channel. A guide plate is installed on the inner wall of the first through hole of each heat-conducting plate. The guide plates in adjacent heat-conducting plates are staggered to form a flow gap. The multiple guide plates together form a guide assembly in the first heat exchange channel. The guide plates can turbulentize the black water flowing in the first heat exchange channel, causing the black water to form a curved flow in the first heat exchange channel, disrupting the laminar boundary layer, increasing the turbulence intensity of the black water, and significantly reducing the probability of solid particles adhering to the inner surface of the first heat exchange channel.

Description

Technical Field

[0001] This application belongs to the technical field of waste heat recovery equipment for coal chemical black water, specifically relating to a plate heat exchanger for waste heat recovery of coal chemical black water. Background Technology

[0002] Black water generated during coal chemical production is a type of industrial wastewater characterized by high temperature, high corrosiveness, and high solids content. Its temperature typically ranges from 80 to 120°C, and it contains a significant amount of waste heat. Traditional black water treatment primarily relies on direct cooling with cooling towers, which not only wastes heat energy but also requires additional electricity to power the cooling equipment. Therefore, recovering waste heat from black water through heat exchangers for preheating boiler feedwater, driving absorption refrigeration, or district heating has become an important technological approach for energy conservation and emission reduction in the industry.

[0003] Plate heat exchangers are widely used in the waste heat exchange of coal chemical black water due to their high heat transfer efficiency and applicability to low-temperature heat sources. However, existing plate heat exchangers have several shortcomings in heat exchange of coal chemical black water waste: coal chemical black water contains a large number of solid particles, and even after filtration before entering the plate heat exchanger, a certain number of solid particles still remain inside. These solid particles easily deposit in the flow channels of the heat exchanger, eventually forming localized siltation. As the operating time increases, the effective cross-sectional area of ​​the heat exchanger flow channels shrinks, the flow resistance of the black water increases significantly, the heat transfer coefficient decreases, and in severe cases, it can even cause complete blockage of the heat exchanger. Utility Model Content

[0004] This application provides a plate heat exchanger for waste heat recovery from coal chemical black water, which solves the technical problems of poor heat exchange effect and high maintenance pressure caused by solid waste deposition in traditional heat exchangers used in the field of coal chemical black water heat exchange.

[0005] The technical solution adopted in this application is as follows:

[0006] A plate heat exchanger for recovering waste heat from coal chemical black water includes a frame and a heat-conducting assembly installed on the frame. The heat-conducting assembly has a first heat exchange channel for black water flow and a second heat exchange channel for heat exchange medium flow. The heat-conducting assembly is composed of multiple heat-conducting plates sequentially spliced ​​together. Each heat-conducting plate has a first through hole and a second through hole. Multiple first through holes are aligned to form the first heat exchange channel, and multiple second through holes are aligned to form the second heat exchange channel. A guide plate is installed on the inner wall of the first through hole of each heat-conducting plate. The guide plates in adjacent heat-conducting plates are staggered to form a flow gap. Multiple guide plates together form a guide assembly in the first heat exchange channel.

[0007] The plate heat exchanger described in this application also includes the following additional technical features:

[0008] The heat-conducting plate has a limiting seat on the inner wall of the first through hole, and the bottom of the flow guide plate has a plug-in part that matches the limiting seat. The flow guide plate is detachably connected to the heat-conducting plate through the plug-in part and the limiting seat.

[0009] The limiting seat is fixedly connected to the heat-conducting plate. The limiting seat has a dovetail groove. The insertion part is adapted to the shape of the dovetail groove. The insertion part can be inserted into or pulled out from the end of the dovetail groove.

[0010] The plate heat exchanger also includes a limiting rod. The limiting seat has two opposing limiting holes at both ends of the dovetail groove. The limiting rod is inserted into the two limiting holes in sequence and is detachably connected to the limiting seat. The limiting rod abuts against the insertion part to limit the displacement of the insertion part in the dovetail groove.

[0011] The guide plate includes a body part, and a hydrophobic layer is provided on the outside of the body part. The friction coefficient of the hydrophobic layer is less than that of the body part.

[0012] Each heat-conducting plate in the heat-conducting assembly has a turbulence groove opened in the first through hole in sequence, and the turbulence grooves are connected in sequence to form a turbulence channel parallel to the first heat exchange channel.

[0013] The number of the turbulence channels is multiple and they are arranged at intervals around the first heat exchange channel, and the turbulence channels are staggered with the guide plate.

[0014] The plate heat exchanger also includes a first water supply pipe connected to the inlet of the first heat exchange channel and a first water outlet pipe connected to the outlet of the first heat exchange channel, wherein a filter screen is provided inside the first water supply pipe.

[0015] The first water outlet pipe has an installation groove on its wall, and the filter screen is installed in the installation groove by engaging with it.

[0016] The mounting groove is equipped with an elastic sealing element.

[0017] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0018] 1. The heat-conducting assembly in the plate heat exchanger of this application is formed by multiple heat-conducting plates aligned together, and each heat-conducting plate has a guide plate at the first through hole. The staggered arrangement of the guide plates can turbulently flow the black water flowing in the first heat exchange channel, causing the black water to form a curved flow in the first heat exchange channel, disrupting the laminar boundary layer and increasing the intensity of black water turbulence. This makes it less likely for solid particles in the black water to adhere to the inner surface of the first heat exchange channel under turbulent flow, significantly reducing the probability of solid particles adhering to the inner surface of the first heat exchange channel, reducing the pressure of heat exchanger cleaning and maintenance, and ensuring the heat transfer efficiency of the heat-conducting assembly from the first heat exchange channel. At the same time, the increased turbulence of the black water also allows it to fully contact the outer surface of the first heat exchange channel, increasing heat transfer to the heat-conducting assembly and helping to improve the heat exchanger's heat exchange efficiency. Furthermore, the staggered arrangement of the guide plates on adjacent heat-conducting plates, forming a flow gap in the middle for black water to pass through, allows the black water carrying solid particles to smoothly pass through the first heat exchange channel, ensuring smooth flow of black water in the plate heat exchanger.

[0019] 2. In a preferred embodiment of this application, the guide plate is detachably connected to the heat-conducting plate, facilitating its removal for replacement or maintenance as needed. If the guide plate is damaged during prolonged use, it is not necessary to replace the entire heat-conducting plate; only the guide plate needs to be disassembled and replaced, resulting in good economic efficiency. Furthermore, the fit between the limiting seat and the insertion part allows for the replacement of guide plates of different specifications based on factors such as the viscosity of the black water and the diameter of solid particles. For example, for black water with a high solid particle content, a higher-density guide plate can be selected to enhance its impact resistance and wear resistance; for high-viscosity black water, a lower-resistance guide plate with a smoother outer surface can be used to increase the smoothness of black water flow. This modular design enables the heat exchanger to adapt to various operating conditions, improving its adaptability. In addition, the tight fit between the insertion part and the limiting seat helps improve the installation stability of the guide plate on the heat-conducting plate, reducing the probability of the guide plate loosening and falling off due to black water impact, and improving the working stability of the heat exchanger.

[0020] 3. As a preferred embodiment of this application, the matching of the trapezoidal cross section of the dovetail groove with the plug-in part enables the limiting seat to play a vertical limiting role on the plug-in part, preventing the plug-in part from coming out of the limiting seat vertically. Moreover, the design of the dovetail groove makes the plug-in part easier to insert and remove, and can quickly realize the connection and disassembly of the guide plate and the heat conduction plate.

[0021] 4. In a preferred embodiment of this application, the limiting rod passes through two limiting holes in sequence, forming a bidirectional constraint on the insertion part, thereby fixing the insertion part within the dovetail groove. When the black water flow rate is too fast and the impact force on the guide plate is large, causing the insertion part to tend to slide within the dovetail groove, the limiting rod can stop the insertion part to limit its movement. Furthermore, the cooperation between the limiting rod and the limiting holes makes operation convenient. When installing the insertion part, it is only necessary to insert the insertion part into the dovetail groove and then insert the limiting rod into the limiting hole, which helps improve the efficiency of the guide plate's assembly and disassembly.

[0022] 5. As a preferred embodiment of this application, the turbulence channel further enhances the turbulence of the black water in the first heat exchange channel, effectively disrupting the laminar boundary layer of the black water to create turbulence. The turbulent energy generated by the turbulence channel keeps the tiny solid particles in the black water suspended, further reducing the settling rate of black water particles in the first heat exchange channel. This reduces the probability of solid particles adhering to the first heat exchange channel, thus reducing the cleaning and maintenance burden on the heat exchanger. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0024] Figure 1 This is a schematic diagram of the structure of a plate heat exchanger according to one embodiment of this application;

[0025] Figure 2 This is a front view of the heat-conducting plate according to one embodiment of this application;

[0026] Figure 3 for Figure 2 Enlarged view of part A;

[0027] Figure 4 This is a front view of the heat-conducting assembly according to one embodiment of this application;

[0028] Figure 5 for Figure 4 Enlarged view of part B;

[0029] Figure 6 This is a schematic diagram of the structure of the heat-conducting plate according to one embodiment of this application;

[0030] Figure 7 for Figure 6 Enlarged view of part C;

[0031] Figure 8 This is a schematic diagram of the structure of the guide plate according to one embodiment of this application;

[0032] Figure 9This is a schematic diagram of the guide plate and limiting seat structure according to one embodiment of this application;

[0033] Figure 10 for Figure 9 Enlarged view of part D.

[0034] List of components and reference numerals:

[0035] 1 frame;

[0036] 2 heat conduction group, 21 heat conduction plate, 211 first through hole, 212 second through hole, 213 flow guide plate, 2131 plug-in part;

[0037] 3. First heat exchange channel;

[0038] 4. Second heat exchange channel;

[0039] 5. Limit seat; 51. Dovetail groove; 52. Limit hole;

[0040] 6 limit rods;

[0041] 7. Fluid flow channels;

[0042] 8 bleed channels;

[0043] 9. First water supply pipe;

[0044] 10. First water outlet pipe;

[0045] 110 Second water supply pipe;

[0046] 120 Second water outlet pipe. Detailed Implementation

[0047] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0048] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0049] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application.

[0050] In this application, unless otherwise expressly 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 communication connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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 can be combined in any suitable manner in one or more embodiments or examples.

[0052] like Figures 1 to 10 As shown, a plate heat exchanger for recovering waste heat from coal chemical black water includes a frame 1 and a heat-conducting assembly 2 installed on the frame 1. The heat-conducting assembly 2 has a first heat exchange channel 3 for black water flow and a second heat exchange channel 4 for heat exchange medium flow. The heat-conducting assembly 2 is composed of multiple heat-conducting plates 21 sequentially spliced ​​together. Each heat-conducting plate 21 has a first through hole 211 and a second through hole 212. The multiple first through holes 211 are aligned to form the first heat exchange channel 3, and the multiple second through holes 212 are aligned to form the second heat exchange channel 4. A guide plate 213 is installed on the inner wall of the heat-conducting plate 21 in the first through hole 211. The guide plates 213 in adjacent heat-conducting plates 21 are staggered to form a flow gap. The multiple guide plates 213 together form a guide assembly in the first heat exchange channel 3.

[0053] The heat-conducting assembly 2 in the plate heat exchanger of this application is formed by aligning multiple heat-conducting plates 21, and each heat-conducting plate 21 is provided with a guide plate 213 at the first through hole 211. The staggered guide plates 213 can turbulentize the black water flowing in the first heat exchange channel 3, causing the black water to form a curved flow in the first heat exchange channel 3, destroying the laminar boundary layer and increasing the turbulence intensity of the black water. As a result, solid particles in the black water are less likely to be adsorbed onto the inner surface of the first heat exchange channel 3 under the action of turbulence, greatly reducing the probability of solid particles adhering to the inner surface of the first heat exchange channel 3, reducing the pressure of heat exchanger cleaning and maintenance, and ensuring the heat transfer efficiency of the first heat exchange channel 3 to the heat-conducting assembly 2. At the same time, the increased turbulence of the black water also allows it to fully contact the outer surface of the first heat exchange channel 3, increasing the heat transfer to the heat-conducting assembly 2, which helps to improve the heat exchange efficiency of the heat exchanger. In addition, the guide plates 213 on the two adjacent heat-conducting plates 21 are staggered and form a flow gap in the middle for black water to pass through, so that the black water carrying solid particles can pass smoothly through the first heat exchange channel 3, ensuring the smooth flow of black water in the plate heat exchanger.

[0054] Specifically, the heat exchange medium in the second heat exchange channel 4 is water or heat exchange oil.

[0055] As a preferred embodiment of this application, such as Figures 6 to 10 As shown, the heat-conducting plate 21 is provided with a limiting seat 5 on the inner wall of the first through hole 211, and the bottom of the flow guide plate 213 is provided with a plug-in part 2131 that matches the limiting seat 5. The flow guide plate 213 is detachably connected to the heat-conducting plate 21 through the plug-in part 2131 and the limiting seat 5.

[0056] The guide plate 213 is designed to be detachably connected to the heat conduction plate 21, facilitating easy removal and replacement or maintenance as needed. If the guide plate 213 is damaged during prolonged use, it is not necessary to replace the entire heat conduction plate 21; only the guide plate 213 needs to be disassembled and replaced, resulting in good economic efficiency. Furthermore, the mating design of the limiting seat 5 and the insertion part 2131 allows for the replacement of guide plates 213 of different specifications based on factors such as the viscosity of the black water and the diameter of solid particles. For example, for black water with a high solid particle content, a guide plate 213 with a higher density can be selected to enhance its impact resistance and wear resistance; for high-viscosity black water, a guide plate 213 with a smoother, low-resistance surface can be used to increase the smoothness of black water flow. This modular design enables the heat exchanger to adapt to various operating conditions, improving its versatility. In addition, the tight fit between the plug part 2131 and the limiting seat 5 helps to improve the installation stability of the guide plate 213 on the heat conduction plate 21, reduces the probability of the guide plate 213 becoming loose and falling off due to black water impact, and improves the working stability of the heat exchanger.

[0057] As a preferred embodiment of this implementation, such as Figures 8 to 10 As shown, the limiting seat 5 is fixedly connected to the heat-conducting plate 21. The limiting seat 5 has a dovetail groove 51. The insertion part 2131 is adapted to the shape of the dovetail groove 51. The insertion part 2131 can be inserted into or pulled out from the end of the dovetail groove 51.

[0058] The matching of the trapezoidal cross section of the dovetail groove 51 with the plug-in part 2131 enables the limiting seat 5 to vertically limit the plug-in part 2131, preventing the plug-in part 2131 from vertically dislodging from the limiting seat 5. Furthermore, the design of the dovetail groove 51 makes the plug-in part 2131 easier to insert and remove, enabling quick connection and disassembly of the guide plate 213 and the heat conduction plate 21.

[0059] Preferably, the thickness of the limiting seat 5 gradually changes, the dimensions of the dovetail groove 51 are equal at all points along its extension direction, and the insertion part 2131 extends in a straight line. In this way, the probability of the insertion part 2131 getting stuck when moving in the dovetail groove 51 can be greatly reduced.

[0060] As a preferred example in this embodiment, such as Figure 10 As shown, the plate heat exchanger also includes a limiting rod 6. The limiting seat 5 has two opposing limiting holes 52 at both ends of the dovetail groove 51. The limiting rod 6 is inserted into the two limiting holes 52 in sequence and is detachably connected to the limiting seat 5. The limiting rod 6 abuts against the insertion part 2131 to limit the displacement of the insertion part 2131 in the dovetail groove 51.

[0061] The limiting rod 6 passes through two limiting holes 52 in sequence, forming a bidirectional constraint on the insertion part 2131, thereby fixing the insertion part 2131 within the dovetail groove 51. When the black water flow rate is too fast and the impact force on the guide plate 213 is large, causing the insertion part 2131 to tend to slide within the dovetail groove 51, the limiting rod 6 can stop the insertion part 2131 to limit its movement. In addition, the cooperation between the limiting rod 6 and the limiting hole 52 makes the operation more convenient. When installing the insertion part 2131, it is only necessary to insert the insertion part 2131 into the dovetail groove 51 and then insert the limiting rod 6 into the limiting hole 52, which helps to improve the efficiency of disassembly and assembly of the guide plate 213.

[0062] Preferably, the limiting hole 52 is provided with threads, and the limiting rod 6 is a threaded rod, with the limiting rod 6 threadedly engaged with the limiting hole 52.

[0063] This embodiment does not limit the structural form of the dovetail groove 51. In another example, the dovetail groove 51 has only one opening, and the limiting rod 6 and the limiting hole 52 are only provided at the opening of the dovetail groove 51.

[0064] In a preferred embodiment of this application, the guide plate 213 includes a body portion, and a hydrophobic layer is provided on the outside of the body portion, wherein the friction coefficient of the hydrophobic layer is less than the friction coefficient of the body portion.

[0065] The hydrophobic layer makes it difficult for solid particles in the black water to adhere, reducing the probability of solid particles sticking to the guide plate 213 and reducing the cleaning and maintenance burden of the guide plate 213. Preferably, the hydrophobic layer can be a polytetrafluoroethylene coating.

[0066] As a preferred embodiment of this application, such as Figures 2 to 5 As shown, each heat-conducting plate 21 in the heat-conducting group 2 has a turbulence groove 7 opened in the first through hole 211 in sequence, and the turbulence grooves 7 are connected in sequence to form a turbulence channel 8 parallel to the first heat exchange channel 3.

[0067] The turbulence channel 7 further enhances the turbulence of the black water in the first heat exchange channel 3, effectively disrupting the laminar boundary layer of the black water to create turbulence. The turbulent energy generated by the turbulence channel 8 keeps the tiny solid particles in the black water suspended, further reducing the settling rate of black water particles in the first heat exchange channel 3. This reduces the probability of solid particles adhering to the first heat exchange channel 3, thus reducing the cleaning and maintenance burden on the heat exchanger.

[0068] As a preferred embodiment of this implementation, such as Figure 5 As shown, there are multiple turbulence channels 8 arranged at intervals along the circumference of the first heat exchange channel 3, and the turbulence channels 8 are staggered with the guide plate 213.

[0069] The presence of multiple turbulence channels 8 increases the turbulence on the black water within the first heat exchange channel 3, further reducing the probability of solid particles in the black water adhering to the first heat exchange channel 3. Furthermore, the staggered arrangement of the turbulence channels 8 and the guide plate 213 prevents interference between the turbulence channel 7 and the installation of the guide plate 213.

[0070] As a preferred embodiment of this application, such as Figure 1 As shown, the plate heat exchanger also includes a first water supply pipe 9 connected to the inlet of the first heat exchange channel 3 and a first water outlet pipe 10 connected to the outlet of the first heat exchange channel 3. The first water supply pipe 9 is equipped with a filter screen.

[0071] The filter screen can intercept some solid particles such as coal slag and fiber in the black water, reducing the content of solid waste in the black water entering the first black water channel, thereby reducing the probability of solid waste accumulation and deposition in the first heat exchange channel 3.

[0072] Specifically, the black water enters the first heat exchange channel 3 from the first water supply pipe 9 and then flows out through the first water outlet pipe 10. Black water in the coal chemical industry usually needs to be cooled and recycled. In this application, after the black water undergoes heat exchange in the plate heat exchanger, the heat contained in the black water is reduced, which helps to cool it down and recycle it.

[0073] Preferably, the plate heat exchanger further includes a second water supply pipe 110 connected to the inlet of the second heat exchange channel 4 and a second water outlet pipe 120 connected to the outlet of the second heat exchange channel 4. The second water supply pipe 110 and the second water outlet pipe 120 are respectively used to supply heat exchange medium to the second heat exchange channel 4 and to output heat exchange medium.

[0074] As a preferred embodiment of this implementation, the wall of the first water outlet pipe 10 is provided with an installation groove, and the filter screen is installed in the installation groove by engaging with the installation groove.

[0075] The filter screen is detachably installed on the first water outlet pipe 10 by snapping it into the mounting groove, which enables quick installation and removal of the filter screen, reducing the pressure of installing and removing the filter screen. At the same time, the detachable design of the filter screen makes it easy to remove the filter screen for cleaning or replacement.

[0076] Specifically, the installation groove is embedded in the wall of the first water outlet pipe 10, but does not penetrate the pipe wall.

[0077] Preferably, the mounting groove is provided with an elastic sealing element. The elastic sealing element can seal the gap between the filter screen and the mounting groove, reducing the probability of solid waste in the black water entering the gap between the filter screen and the mounting groove.

[0078] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0079] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0080] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A plate heat exchanger for recovering waste heat from coal chemical black water, characterized in that, It includes a frame and a heat-conducting assembly installed on the frame. The heat-conducting assembly has a first heat exchange channel for black water to flow through and a second heat exchange channel for heat exchange medium to flow through. The heat-conducting assembly is composed of multiple heat-conducting plates spliced ​​together in sequence. Each heat-conducting plate has a first through hole and a second through hole. Multiple first through holes are aligned to form a first heat exchange channel, and multiple second through holes are aligned to form a second heat exchange channel. The heat-conducting plate has a flow guide plate installed on the inner wall of the first through hole. The flow guide plates in two adjacent heat-conducting plates are staggered to form a flow gap. Multiple flow guide plates together form a flow guide group in the first heat exchange channel.

2. The plate heat exchanger according to claim 1, characterized in that, The heat-conducting plate has a limiting seat on the inner wall of the first through hole, and the bottom of the flow guide plate has a plug-in part that matches the limiting seat. The flow guide plate is detachably connected to the heat-conducting plate through the plug-in part and the limiting seat.

3. The plate heat exchanger according to claim 2, characterized in that, The limiting seat is fixedly connected to the heat-conducting plate. The limiting seat has a dovetail groove. The insertion part is adapted to the shape of the dovetail groove. The insertion part can be inserted into or pulled out from the end of the dovetail groove.

4. The plate heat exchanger according to claim 3, characterized in that, The plate heat exchanger also includes a limiting rod. The limiting seat has two opposing limiting holes at both ends of the dovetail groove. The limiting rod is inserted into the two limiting holes in sequence and is detachably connected to the limiting seat. The limiting rod abuts against the insertion part to limit the displacement of the insertion part in the dovetail groove.

5. The plate heat exchanger according to claim 1, characterized in that, The guide plate includes a body part, and a hydrophobic layer is provided on the outside of the body part. The friction coefficient of the hydrophobic layer is less than that of the body part.

6. The plate heat exchanger according to claim 1, characterized in that, Each heat-conducting plate in the heat-conducting assembly has a turbulence groove opened in the first through hole in sequence, and the turbulence grooves are connected in sequence to form a turbulence channel parallel to the first heat exchange channel.

7. The plate heat exchanger according to claim 6, characterized in that, The number of the turbulence channels is multiple and they are arranged at intervals around the first heat exchange channel, and the turbulence channels are staggered with the guide plate.

8. The plate heat exchanger according to claim 1, characterized in that, The plate heat exchanger also includes a first water supply pipe connected to the inlet of the first heat exchange channel and a first water outlet pipe connected to the outlet of the first heat exchange channel, wherein a filter screen is provided inside the first water supply pipe.

9. The plate heat exchanger according to claim 8, characterized in that, The first water outlet pipe has an installation groove on its wall, and the filter screen is installed in the installation groove by engaging with it.

10. The plate heat exchanger according to claim 9, characterized in that, The mounting groove is equipped with an elastic sealing element.

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