Polytetrafluoroethylene impregnated impermeable graphite plate heat exchanger

Abstract

The utility model discloses a polytetrafluoroethylene impregnated impermeable graphite plate heat exchanger which comprises a heat exchange area formed by stacking graphite heat exchange plates, and two sealing plates are symmetrically arranged at the two ends of the heat exchange area. A heat exchange plate groove is formed in each of the two sides of the graphite heat exchange plate, and a plurality of material overflowing holes are formed in the edge of the graphite heat exchange plate; a plurality of parallel Z-shaped service side overflowing holes are formed in the graphite heat exchange plate; when the adjacent graphite heat exchange plates are stacked, one of the graphite heat exchange plates is turned up and down by 180 degrees, so that orifices of the adjacent service side overflowing holes are in butt joint, and an arched service side channel is formed; a material inlet / outlet and a service side inlet / outlet are formed in the sealing plate, the material inlet / outlet is communicated with the heat exchange plate groove, and the service side inlet / outlet is communicated with the service side overflowing hole. The plate type heat exchanger made of graphite has the advantages of being not prone to being blocked and convenient to clean and maintain. And the heat exchanger has the characteristics of compact structure, easiness in processing, low manufacturing cost, reasonable design and high heat exchange efficiency.

Description

Technical Field

[0001] The utility model relates to a graphite heat exchanger, in particular to an impermeable graphite plate heat exchanger impregnated with polytetrafluoroethylene. Background Art

[0002] Graphite heat exchanger is a common type of heat exchanger. It has many advantages such as corrosion resistance and high temperature resistance. Therefore, it is widely used in the industrial field.

[0003] Currently, the most common type of graphite heat exchanger is the shell-and-tube graphite heat exchanger, which achieves heat exchange through the temperature difference between the materials inside and outside the graphite heat exchange tubes. Its disadvantage is that when processing materials that are prone to scaling, the tube holes are easily clogged, and cleaning and maintenance are very difficult, which greatly shortens the service life of the heat exchanger.

[0004] Plate heat exchangers are another common type of heat exchanger. Their basic principle is to exchange heat by utilizing the temperature difference between the materials on both sides of the heat exchange plate. However, due to the large pressure difference between the two sides of the heat exchange plate, graphite materials have poor compressive properties and are relatively brittle. Therefore, the use of graphite heat exchange plates in plate heat exchangers is difficult, resulting in the current use of metal materials in most plate heat exchangers.

[0005] To this end, the present application designs and provides a polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger, which overcomes the defects of traditional shell-and-tube graphite heat exchangers and, at the same time, expands the types of plate heat exchangers. Utility Model Content

[0006] To address the aforementioned technical issues, the present invention provides a polytetrafluoroethylene-impregnated, impermeable graphite plate heat exchanger. This graphite plate heat exchanger is characterized by its resistance to clogging, ease of cleaning, and ease of maintenance. It also features a compact structure, ease of processing, low manufacturing cost, rational design, and high heat exchange efficiency.

[0007] The technical solution of this utility model:

[0008] A polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger, comprising a heat exchange zone formed by stacking multiple polytetrafluoroethylene-impregnated graphite heat exchange plates, with two sealing plates symmetrically provided at both ends of the heat exchange zone; the graphite heat exchange plate is a square plate, and a heat exchange plate groove is provided on each side of the plate in the thickness direction. When adjacent graphite heat exchange plates are stacked, the middle heat exchange plate groove forms a sealed material flow cavity; a plurality of material flow holes are arranged along the width direction at the edge of the heat exchange plate groove, penetrating the thickness direction of the graphite heat exchange plate, and the material flow holes on adjacent graphite heat exchange plates are staggered left and right; the graphite heat exchange plate is a square plate, and a heat exchange plate groove is provided on each side of the plate in the thickness direction. A number of parallel service-side flow holes are provided inside the heat exchange plate. The service-side flow holes are Z-shaped, and the ports at both ends extend to both sides of the thickness direction of the graphite heat exchange plate respectively, and the arrangement direction of the service-side flow holes is perpendicular to the arrangement direction of the material flow holes; when adjacent graphite heat exchange plates are stacked, one of them is flipped up and down 180° so that the orifices of adjacent service-side flow holes are connected to form an arched service-side channel; the sealing plate is provided with a material inlet and a service-side inlet and outlet, the material inlet and outlet are connected to the groove of the heat exchange plate, and the service-side inlet and outlet are connected to the service-side flow holes.

[0009] This solution uses stacked graphite heat exchange plates to form a heat exchange area, and forms material flow channels and service side channels through the grooves on both sides of the graphite heat exchange plates and the service side flow holes inside, thereby realizing the heat exchange function. The entire structure is a plate structure, which is not easy to clog during use and is easy to disassemble, making it more convenient for cleaning and maintenance.

[0010] Preferably, in the aforementioned polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger, sealing plate grooves are provided on the inner sides opposite to the sealing plates.

[0011] This solution increases the material flow space inside the sealing plate by arranging a sealing plate groove on the inner side of the sealing plate, and the design is more reasonable.

[0012] Preferably, in the aforementioned polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger, a service side diverter groove is provided on the inner side opposite to the sealing plate, and the service side diverter groove is connected to the service side flow hole and the service side inlet and outlet.

[0013] This solution sets a service-side diversion groove on the inner side of the sealing plate, so that the high-temperature medium can enter the service-side flow hole more evenly, the temperature distribution of the graphite heat exchange plate is more uniform, and the heat exchange efficiency is higher.

[0014] Preferably, in the aforementioned polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger, a material diversion groove is provided on the inner side opposite to the sealing plate, and the material diversion groove is connected to the heat exchange plate groove and the material inlet and outlet; more preferably, the material diversion groove is an embedded groove, and the material diversion groove is connected to the heat exchange plate groove through a plurality of material diversion holes arranged along the length direction of the material diversion groove.

[0015] This solution sets a material diversion groove on the inner side of the sealing plate, so that the material can enter the material flow cavity more evenly, the overall flow is more uniform, and the heat exchange efficiency is higher.

[0016] Preferably, in the aforementioned polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger, sealing gaskets are provided between the graphite heat exchange plates and between the graphite heat exchange plates and the sealing plate, and flow holes are provided on the sealing gaskets at locations corresponding to the flow holes on the service side.

[0017] This solution provides a sealing gasket to improve the sealing performance of the connection and make the design more reasonable.

[0018] Preferably, in the aforementioned polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger, the sealing plates are provided with mounting holes, and the sealing plates are connected via screw and nut assemblies passing through the mounting holes.

[0019] This solution uses a screw-nut assembly to connect and fix the sealing plates on both sides, making the entire heat exchanger structure simpler, the manufacturing cost lower, and the disassembly and maintenance more convenient.

[0020] Beneficial effects of the utility model:

[0021] 1. The utility model realizes the heat exchange function by using stacked graphite heat exchange plates to form a heat exchange area, and forms a material flow channel and a service side channel through the grooves on both sides of the graphite heat exchange plates and the internal service side flow holes. The entire structure is a plate structure, which is not easy to be blocked during use and is easy to disassemble, making it more convenient for cleaning and maintenance.

[0022] 2. The utility model provides a sealing plate groove on the inner side of the sealing plate, thereby increasing the material flow space inside the sealing plate and making the design more reasonable.

[0023] 3. The utility model provides a service side diversion groove on the inner side of the sealing plate, so that the high temperature medium can enter the service side flow hole more evenly, the temperature distribution of the graphite heat exchange plate is more uniform, and the heat exchange efficiency is higher.

[0024] 4. The utility model provides a material diversion groove on the inner side of the sealing plate, so that the material can enter the material flow cavity more evenly, the overall flow is more uniform, and the heat exchange efficiency is higher.

[0025] 5. The utility model provides a sealing gasket, which makes the sealing of the connection better and the design more reasonable.

[0026] 6. The utility model uses a screw-nut assembly to connect and fix the sealing plates on both sides, making the entire heat exchanger structure simpler, the manufacturing cost lower, and the disassembly and maintenance more convenient.

[0027] In summary, the utility model has the advantages of being not easy to clog, easy to clean and maintain, compact structure, easy to process, low manufacturing cost, reasonable design and high heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Attachment Figure 1 This is the main sectional view of the utility model;

[0029] Attachment Figure 2 It is a left sectional view of the utility model;

[0030] Attachment Figure 3 It is the plan view of graphite heat exchange plate;

[0031] Attachment Figure 4 For attachment Figure 3 AA view;

[0032] Attachment Figure 5 For attachment Figure 3 BB view;

[0033] Attachment Figure 6 This is the plan view of the closure board;

[0034] Attachment Figure 7 For attachment Figure 6 CC view;

[0035] Attachment Figure 8 For attachment Figure 6 DD view;

[0036] Attachment Figure 9 This is a plan view of the sealing gasket.

[0037] Explanation of the figure marks: 1-graphite heat exchange plate, 2-sealing plate, 3-heat exchange plate groove, 4-material flow hole, 5-service side flow hole, 6-material inlet and outlet, 7-service side inlet and outlet, 8-sealing plate groove, 9-service side diversion groove, 10-material diversion groove, 11-material diversion hole, 12-sealing gasket, 13-flow hole, 14-mounting hole, 15-screw and nut assembly. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the embodiments, but they are not intended to limit the present invention.

[0039] Embodiments of the present utility model

[0040] A polytetrafluoroethylene impregnated impermeable graphite plate heat exchanger, as shown in the attached Figure 1-9 As shown, it includes a heat exchange zone formed by stacking multiple graphite heat exchange plates 1 impregnated with polytetrafluoroethylene, and two sealing plates 2 are symmetrically provided at both ends of the heat exchange zone;

[0041] The graphite heat exchange plate 1 is a square plate, and a heat exchange plate groove 3 is provided on each side of the plate in the thickness direction. When adjacent graphite heat exchange plates 1 are stacked, the middle heat exchange plate groove 3 forms a sealed material flow cavity; a plurality of material flow holes 4 are arranged along the width direction at the edge of the heat exchange plate groove 3 and penetrate the thickness direction of the graphite heat exchange plate 1. The material flow holes 4 on adjacent graphite heat exchange plates 1 are staggered left and right.

[0042] The graphite heat exchange plate 1 is provided with a plurality of parallel service-side flow holes 5. The service-side flow holes 5 are Z-shaped, with ports at both ends extending to both sides of the thickness direction of the graphite heat exchange plate 1. The arrangement direction of the service-side flow holes 5 is perpendicular to the arrangement direction of the material flow holes 4. When adjacent graphite heat exchange plates 1 are stacked, one of them is flipped up and down 180° so that the openings of adjacent service-side flow holes 5 are butted together, forming an arched service-side channel.

[0043] The sealing plate 2 is provided with a material inlet and outlet 6 and a service side inlet and outlet 7 . The material inlet and outlet 6 is connected to the heat exchange plate groove 3 , and the service side inlet and outlet 7 is connected to the service side flow hole 5 .

[0044] The impregnation method of the graphite heat exchange plate of this embodiment is as follows:

[0045] 1) Clean the machined graphite heat exchange plate with gasoline to remove oil stains on the surface of the material, and then rinse it with clean water;

[0046] 2) Place the cleaned graphite heat exchange plate in a drying room and dry it at 120°C for 3 hours;

[0047] 3) Place the graphite heat exchange plate naturally cooled to 30-40°C in an impregnation kettle, evacuate to 400 Pa, maintain for 7.5 hours, then absorb a polytetrafluoroethylene dispersion with a melting point of 300-330°C, pressurize to 2 MPa and maintain for 20 hours. After depressurization, drain the polytetrafluoroethylene dispersion with a high melting point;

[0048] 4) Take out the impregnated graphite heat exchange plate and dry it in a drying room at 120°C for 2 hours;

[0049] 5) Repeat steps 3) and 4) three times;

[0050] 6) The graphite heat exchange plate impregnated with polytetrafluoroethylene and dried is placed in a heat treatment furnace, and the temperature is raised to 250°C within 3 hours, kept warm for 1 hour, raised to 300°C within 1 hour, kept warm for 1 hour, raised to 350°C within 1 hour, kept warm for 1 hour, raised to 390°C within 1 hour, kept warm for 1 hour, lowered to 350°C within 1 hour, kept warm for 1 hour, lowered to 300°C within 1 hour, kept warm for 1 hour, lowered to 250°C within 1 hour, kept warm for 1 hour, and lowered to 40°C within 3 hours to obtain a polytetrafluoroethylene impregnated graphite heat exchange plate.

[0051] During assembly, first take a sealing plate 2 and lay it flat, then take a graphite heat exchange plate 1 and lay it flat on the sealing plate 2, connect the orifice of the service side flow hole 5 on the graphite heat exchange plate 1 with the service side inlet and outlet 7 on the sealing plate 2, then take another graphite heat exchange plate 1, turn it upside down 180°, so that the orifice of the service side flow hole 5 on the same side is connected, and so on, until all the graphite heat exchange plates 1 are assembled, and finally turn the other sealing plate 2 upside down and cover the top end, so that the service side inlet and outlet 7 is connected with the orifice of the service side flow hole 5 at the top end, thereby forming a complete bow-shaped service side channel; at the same time, the heat exchange plate grooves 3 between adjacent graphite heat exchange plates 1 form a material flow cavity, which forms a material flow channel and a heat exchange channel after being connected with the material flow hole 4 and the material inlet and outlet 6.

[0052] During use, the service side inlet and outlet 7 at both ends are connected to the high-temperature steam pipe and the cooling water return pipe respectively. The high-temperature steam enters the interior of the graphite heat exchange plate 1 and heats it, while the material inlet and outlet 6 on both sides are connected to the material feed pipe and the material discharge pipe respectively. After the material enters from one side, it flows through the heat exchange plate groove 3 and the material flow hole 4 respectively, maintains contact with the graphite heat exchange plate 1 during the flow, thereby performing heat exchange, and is finally discharged from the other end.

[0053] Further implementation examples are attached Figure 1-9 As shown, the inner side of the sealing plate 2 is provided with a sealing plate groove 8. The size of the sealing plate groove 8 is consistent with the size of the heat exchange plate groove 3, so that the volume of the chamber where the internal material flows remains consistent.

[0054] Further implementation examples are attached Figure 1-9 As shown, a service-side diverter groove 9 is provided on the inner side of the sealing plate 2. The service-side diverter groove 9 is in communication with the service-side flow hole 5 and the service-side inlet and outlet 7. The service-side diverter groove 9 is provided along the width direction of the edge of the sealing plate 2 and corresponds to the position of the service-side diverter groove 9 in the vertical direction, thereby reducing the use of pipelines.

[0055] Further implementation examples are attached Figure 1-9As shown, the opposite inner side of the sealing plate 2 is provided with a material diversion groove 10, which is in communication with the heat exchange plate groove 3 and the material inlet and outlet 6. The material diversion groove 10 is also provided on the side of the inner side of the sealing plate 2 to extend the flow path of the material and increase the heat exchange time.

[0056] Further implementation examples are attached Figure 1-9 As shown, the material diversion groove 10 is an embedded groove. The material diversion groove 10 and the heat exchange plate groove 3 are connected through a plurality of material diversion holes 11 arranged along the length of the material diversion groove 10. The specific processing method is to excavate a sinking groove inside the graphite heat exchange plate 1, and then fix a baffle with material diversion holes 11 at the groove end of the sinking groove to enhance the diversion effect.

[0057] Further implementation examples are attached Figure 1-9 As shown, sealing gaskets 12 are provided between the graphite heat exchange plates 1 and between the graphite heat exchange plates 1 and the sealing plate 2. Flow holes 13 are provided on the sealing gaskets 12 at locations corresponding to the service-side flow holes 5. The sealing gaskets 12 are made of a high-temperature and corrosion-resistant material to ensure a tight seal between the connecting surfaces of the components.

[0058] Further implementation examples are attached Figure 1-9 As shown, the sealing plate 2 is provided with a mounting hole 14, and the sealing plates 2 are connected by a screw and nut assembly 15 passing through the mounting hole 14. When cleaning and maintenance are required, after removing the screw and nut assembly 15, the sealing plate 2 and the graphite heat exchange plate 1 can be removed piece by piece and cleaned and maintained separately.

[0059] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and the utility model of the present invention, should be covered by the protection scope of the present invention.

Claims

1. A polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger, characterized in that: The heat exchange zone is formed by stacking a plurality of graphite heat exchange plates (1) impregnated with polytetrafluoroethylene, and two sealing plates (2) are symmetrically provided at both ends of the heat exchange zone; The graphite heat exchange plate (1) is a square plate, and a heat exchange plate groove (3) is provided on each side of the plate in the thickness direction. When adjacent graphite heat exchange plates (1) are stacked, the middle heat exchange plate groove (3) forms a sealed material flow cavity; a plurality of material flow holes (4) penetrating the thickness direction of the graphite heat exchange plate (1) are arranged at the edge of the heat exchange plate groove (3) along the width direction, and the material flow holes (4) on adjacent graphite heat exchange plates (1) are staggered left and right. The graphite heat exchange plate (1) is provided with a plurality of parallel service side flow holes (5) inside. The service side flow holes (5) are Z-shaped, and the ports at both ends extend to both sides of the thickness direction of the graphite heat exchange plate (1), and the arrangement direction of the service side flow holes (5) is perpendicular to the arrangement direction of the material flow holes (4). When adjacent graphite heat exchange plates (1) are stacked, one of them is flipped up and down by 180 degrees so that the openings of adjacent service side flow holes (5) are butted together to form an arched service side channel. The sealing plate (2) is provided with a material inlet and outlet (6) and a service side inlet and outlet (7); the material inlet and outlet (6) is connected to the heat exchange plate groove (3); and the service side inlet and outlet (7) is connected to the service side flow hole (5).

2. The polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger according to claim 1, characterized in that: The opposite inner side of the sealing plate (2) is provided with a sealing plate groove (8).

3. The polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger according to claim 1, characterized in that: A service side diversion groove (9) is provided on the inner side opposite to the sealing plate (2), and the service side diversion groove (9) is in communication with the service side flow hole (5) and the service side inlet and outlet (7).

4. The polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger according to claim 1, characterized in that: A material diversion groove (10) is provided on the inner side opposite to the sealing plate (2), and the material diversion groove (10) is connected to the heat exchange plate groove (3) and the material inlet and outlet (6).

5. The polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger according to claim 4, characterized in that: The material diversion groove (10) is an embedded groove, and the material diversion groove (10) and the heat exchange plate groove (3) are connected via a plurality of material diversion holes (11) arranged along the length direction of the material diversion groove (10).

6. The polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger according to claim 1, characterized in that: Sealing gaskets (12) are provided between the graphite heat exchange plates (1) and between the graphite heat exchange plates (1) and the sealing plate (2), and flow holes (13) are provided on the sealing gaskets (12) at locations corresponding to the service-side flow holes (5).

7. The polytetrafluoroethylene-impregnated impermeable graphite plate heat exchanger according to claim 1, characterized in that: The sealing plates (2) are provided with mounting holes (14), and the sealing plates (2) are connected via screw and nut assemblies (15) passing through the mounting holes (14).

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