A high-efficiency heat exchanger for kiln hot gas recovery

Abstract

The present invention discloses a high-efficiency heat exchanger for kiln hot gas recovery, which relates to the field of heat exchange technology, including a kiln and a ventilation pipe installed on one side of the kiln, and also includes: a heat exchange mechanism assembled on one side of the ventilation pipe, the heat exchange mechanism including a closed box and a closed cover plate, the interior of the closed box is connected with a straight plate, a spiral plate is placed inside the closed box, the straight plate abuts against the outer periphery of the spiral plate, a plurality of protrusions are connected to the outer periphery of the spiral plate, a plurality of spiral grooves are provided inside the spiral plate, the plurality of spiral grooves are vertically arranged in the spiral plate, an inner cavity is provided inside each protrusion, and the inner cavity is connected to the spiral groove, the input ends of the plurality of spiral grooves are connected to oil inlet pipes, and the output ends are connected to oil outlet pipes, the bottom of the closed box is connected to a feed pipe, and the outer periphery of the feed pipe is connected to an air outlet pipe, this spiral design can ensure a stable heat exchange contact surface and achieve more efficient heat exchange.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange, and in particular to a high-efficiency heat exchanger for recovering hot gas from a kiln. Background Art

[0002] During the processing of rubber wood, a lot of rubber wood scraps and sawdust will be produced. After pre-treatment of the scraps and sawdust, these scraps and sawdust can be refined into charcoal through a kiln.

[0003] When the kiln is working, the combustion chamber fully burns the fuel, and the generated flue gas mixes with a large amount of excess air to form a high-temperature airflow. These hot air flows transfer the high-temperature flue gas to the outside of the kiln through natural convection or mechanical air supply. In order to recycle this part of the high-temperature flue gas for use in drying and heating rubber wood to save energy, the existing technology is to recycle it by adopting a heat exchanger. The existing heat exchanger is generally a double-channel design, that is, the heat-absorbing medium pipeline is distributed and arranged in the heat exchange cavity through which the flue gas flows. The heat-absorbing medium here can be heat transfer oil. When the flue gas flows through the heat exchange cavity, it contacts and exchanges heat with the heat-absorbing medium pipeline. The heat transfer oil flowing through the inside is heated by the heat-absorbing medium pipeline to complete the heat exchange. The problem with this heat exchange method is that the distribution of the heat-absorbing medium pipeline needs to take into account the flow direction of the flue gas. If it is arranged too densely, the smoke resistance is too large, and it is easy to form the problem of uneven contact between the heat-absorbing medium pipeline and the flue gas. If it is sparsely arranged, it is difficult to ensure the efficiency of the heat exchange.

[0004] At the same time, the flue gas generated after the kiln combustion is a complex gas mixture, which contains a variety of harmful components, especially smoke. The smoke is composed of particulate matter generated when the fuel is burned. When these particles flow in the hot air flow, they will gradually adhere to the inner wall of the guide tube. As time goes by, the particles attached to the guide tube accumulate more and more, which not only affects the high-temperature flue gas transfer efficiency of the guide tube, but also will lead to a decrease in the heating effect of oil or water under long-term use. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that when particulate matter flows in a hot air flow, it will gradually adhere to the inner wall of the guide pipe. As time goes by, the particulate matter attached to the guide pipe accumulates more and more, which not only affects the high-temperature flue gas transmission efficiency of the guide pipe, but also leads to a decrease in the heating effect of oil or water after long-term use. A solution is proposed.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a high-efficiency heat exchanger for kiln hot gas recovery: including a kiln and a ventilation pipe installed on one side of the kiln, and also including: a heat exchange mechanism installed on one side of the ventilation pipe, the heat exchange mechanism includes a closed box and a closed cover plate, the interior of the closed box is connected with a straight plate, a spiral plate is placed inside the closed box, the straight plate is abutted against the outer periphery of the spiral plate, a plurality of protrusions are connected to the outer periphery of the spiral plate, a plurality of spiral grooves are opened inside the spiral plate, a plurality of spiral grooves are vertically arranged in the spiral plate, an inner cavity is opened inside each protrusion, and the inner cavity is connected to the spiral groove, the input ends of the plurality of spiral grooves are connected to oil inlet pipes, and the output ends are connected to oil outlet pipes, the bottom of the closed box is connected to a feed pipe, and the outer periphery of the feed pipe is connected to an air outlet pipe;

[0007] And a scraping assembly is assembled on the top of the closed cover plate, one end of the scraper included in the scraping assembly slides through the closed cover plate and the power assembly, and the scraper is pressed down by the power assembly so that one end of the scraper slides and scrapes the adsorbed matter on the inner wall of the spiral plate.

[0008] As a further description of the above technical solution:

[0009] The scraping assembly also includes two support rods fixedly installed on the top of the closed cover plate, the outer periphery of the support rods is slidably connected to a connecting disk, the bottom of the connecting disk is connected to a scraper, the top of the support rod is connected to a limit plate for limiting the movement of the connecting disk, and the outer periphery of the support rods is sleeved with a pressure spring.

[0010] As a further description of the above technical solution:

[0011] The periphery of the closed box is connected with a power assembly, which includes a connecting plate installed on the periphery of the closed box. The two connecting plates are connected by a connecting column. A hydraulic cylinder is installed on the top of the connecting column. The bottom end of the hydraulic cylinder is connected to a hydraulic rod. One end of the hydraulic rod passes through the connecting plate and is connected to a lower pressure plate. The bottom end of the lower pressure plate is in contact with the connecting disk.

[0012] As a further description of the above technical solution:

[0013] A switch assembly is connected to the bottom of the lower pressure plate, and the switch assembly includes an extension plate installed at the bottom of the lower pressure plate and a closing plate installed at the bottom of the feeding tube through a rotating member. A mounting plate is connected to one side of the extension plate, and a fixing column is connected between the inner walls of the mounting plates. Two mounting blocks are connected to the bottom of the closing plate, and the two mounting blocks are connected by a fixing column, and the two fixing columns are connected by a sleeve rod, and the sleeve rod is rotatably connected to the two fixing columns.

[0014] As a further description of the above technical solution:

[0015] The rotating member comprises a fixed block fixedly mounted on the outer periphery of the feeding tube, a positioning rod is fixedly connected between the inner walls of the fixed block, the positioning rod is connected to a rotating sleeve block through a torsion spring sleeved on the outer periphery, and the rotating sleeve block is connected to the closing plate.

[0016] As a further description of the above technical solution:

[0017] The heat exchange mechanism also includes a support frame installed at the bottom of the closed box, the bottom of the support frame is in contact with the ground, and a connecting piece is connected between the straight plate and the ventilation pipe.

[0018] As a further description of the above technical solution:

[0019] The connecting piece comprises a connecting plate installed on one side of the ventilation pipe and the two straight plates, and the two connecting plates are connected and fixed by connecting screws and connecting nuts.

[0020] As a further description of the above technical solution:

[0021] A groove is formed through the surface of the closed cover plate, and the inner wall of the groove is connected to two rubber sheets, and both sides of the scraper are slidably connected to the rubber sheets.

[0022] As a further description of the above technical solution:

[0023] The horizontal cross section of the projection is angular, with the top angle facing the spiral contraction direction.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. Accelerated conduction of high-temperature flue gas: The design of the spiral plate gradually reduces from large to small, so that when the high-temperature flue gas flows into the spiral plate along the straight plate, both the inner and outer sides of the spiral plate can fully contact with the high-temperature flue gas, which improves the heat conduction speed of the oil in the spiral groove and achieves more efficient heat exchange.

[0026] 2. High-temperature flue gas cleaning effect: When the high-temperature flue gas flows into the spiral plate, due to its spiral shape, the particles in the high-temperature flue gas will adhere to the inner wall of the spiral plate due to the impact with the inner wall of the spiral plate, which helps to reduce the pollution that may be caused when the high-temperature flue gas is discharged, and plays a role in cleaning the high-temperature flue gas.

[0027] 3. Slow down the flow rate of high-temperature flue gas: The bumps are evenly arranged along the outer wall of the spiral plate. When the high-temperature flue gas flows into the spiral plate and contacts the bumps, it will be accelerated and blown to one side wall of the spiral plate, and the gas flow rate will become faster. This flow impact helps to blow and reduce the particulate matter attached to the inner wall of the spiral plate, thereby improving the heat exchange efficiency of the high-temperature flue gas. At the same time, due to the spiral design, the smoke particles that fall to the bottom are eventually blown to the center of the spiral and discharged through the discharge pipe, while forming a small range of vortex, making the heat exchange temperature of the high-temperature flue gas more uniform, and the high-temperature flue gas can more fully exchange heat with the oil in the spiral plate.

[0028] 4. Improved block heating and heat exchange: The inner cavity design opened inside the block allows the high-temperature flue gas to heat the block when it comes into contact with the block, thereby heating the oil in the inner cavity and improving the overall heat exchange effect.

[0029] 5. Oil agitation and heat exchange: The inner cavity opened inside the convex block is connected to the spiral groove. When the oil flows in the spiral groove, it will enter the inner cavity to form a vortex and generate agitation. This agitation helps the oil to complete heat exchange more fully, making the oil heated more evenly and improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Shows a schematic diagram of the overall structure according to the present invention;

[0031] Figure 2 It shows a schematic structural diagram of a heat exchange mechanism according to the present invention;

[0032] Figure 3 A top view of the internal structure of the heat exchange mechanism according to the present invention is shown;

[0033] Figure 4 A schematic diagram of the spiral plate structure according to the present invention is shown;

[0034] Figure 5 A schematic diagram of the air inlet flow of the spiral plate according to the present invention is shown;

[0035] Figure 6 A schematic diagram of oil flow in a spiral groove according to the present invention is shown;

[0036] Figure 7 A schematic diagram of the ventilation pipe structure according to the present invention is shown;

[0037] Figure 8 It is shown that according to the present invention Figure 7 A partial enlarged view of the middle part;

[0038] Fig. 9 It is shown that according to the present invention Figure 7 A partial enlarged view of point B in the middle;

[0039] Fig.10 A schematic diagram of the structure of a scraping assembly according to the present invention is shown;

[0040] Fig.11 It is shown that according to the present invention Fig.10 A partial enlarged view of point C in the middle;

[0041] Fig.12 A schematic structural diagram of a power assembly according to the present invention is shown.

[0042] Legend:

[0043] 10. Kiln; 11. Ventilation pipe; 12. Connecting plate; 13. Connecting screws; 14. Connecting nuts;

[0044] 20. heat exchange mechanism; 21. support frame; 22. closed box; 221. slot; 222. closed cover plate; 23. straight plate; 24. spiral plate; 241. convex block; 242. spiral groove; 243. inner cavity; 25. oil outlet pipe; 26. oil inlet pipe; 27. feed pipe; 28. air outlet pipe;

[0045] 30. Scraping assembly; 31. Support rod; 32. Limiting plate; 33. Connecting plate; 34. Pressure spring; 35. Scraping plate;

[0046] 40. Power assembly; 41. Connecting plate; 42. Connecting column; 43. Hydraulic cylinder; 44. Hydraulic rod; 45. Lower pressure plate;

[0047] 50. Switch assembly; 51. Extension plate; 52. Mounting plate; 53. Fixing column; 54. Sleeve rod; 55. Mounting block; 56. Closing plate; 561. Fixing block; 562. Positioning rod; 563. Torsion spring; 564. Rotating sleeve block. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] like Figure 1-Figure 12As shown, the present invention provides a high-efficiency heat exchanger for kiln heat recovery: including a kiln 10 and a ventilation pipe 11 installed on one side of the kiln 10, and also including: a heat exchange mechanism 20 assembled on one side of the ventilation pipe 11, the heat exchange mechanism 20 includes a closed box 22 and a closed cover plate 222, the interior of the closed box 22 is connected with a straight plate 23, the bottom of the closed box 22 is connected with a support frame 21, the bottom of the support frame 21 is in contact with the ground, a connector is connected between the straight plate 23 and the ventilation pipe 11, the connector includes a connecting plate 12 installed on one side of the ventilation pipe 11 and two straight plates 23, the two connecting plates 12 are connected and fixed by connecting screws 13 and connecting nuts 14, and the two A sealing sheet is placed between the connecting plates 12, a spiral plate 24 is placed inside the closed box 22, the straight plate 23 is in contact with the outer periphery of the spiral plate 24, a plurality of protrusions 241 are connected to the outer periphery of the spiral plate 24, a plurality of spiral grooves 242 are provided inside the spiral plate 24, a plurality of spiral grooves 242 are vertically arranged inside the spiral plate 24, an inner cavity 243 is provided inside each protrusion 241, and the inner cavity 243 is communicated with the spiral groove 242, an oil inlet pipe 26 is connected to the input end of the plurality of spiral grooves 242, an oil outlet pipe 25 is connected to the output end, an oil pump is connected to the top of the oil outlet pipe 25, a feed pipe 27 is connected to the bottom of the closed box 22, and an air outlet pipe 28 is connected to the outer periphery of the feed pipe 27;

[0050] In order to utilize the high-temperature flue gas generated by the kiln 10, the oil inlet pipe 26 is connected to the oil receiving pipe, so that the oil flows into different spiral grooves 242 along the oil inlet pipe 26, and the flue gas discharged from the kiln 10 flows along the ventilation pipe 11 and enters the closed box 22, and the flue gas flows along the straight plate 23 and the spiral plate 24, so that the flue gas heats the spiral plate 24. While the spiral plate 24 is heated, the high-temperature flue gas is transferred to the spiral groove 242, and the oil flowing inside the spiral groove 242 is heated by heating the spiral plate 24, so as to achieve the utilization of the flue gas, and the flue gas flowing to the center of the spiral plate 24 flows along the discharge pipe 27 and flows out through the air outlet pipe 28;

[0051] The spiral plate 24 is designed to gradually decrease from large to small, so that when the high-temperature flue gas flows into the spiral plate 24 along the straight plate 23, both the inner and outer sides of the spiral plate 24 can fully contact with the high-temperature flue gas. This design effectively accelerates the conduction speed of the high-temperature flue gas, thereby improving the heat conduction speed of the oil in the spiral groove 242, achieving more efficient heat exchange, and when the high-temperature flue gas flows into the spiral plate 24, due to its spiral shape, the particles in the high-temperature flue gas will adhere to the inner wall of the spiral plate 24 due to the impact with the inner wall of the spiral plate 24, which helps to reduce the pollution that may be caused when the high-temperature flue gas is discharged, and plays a role in cleaning the high-temperature flue gas;

[0052] The protrusions 241 are evenly arranged along the outer wall of the spiral plate 24, and the horizontal cross-section of the protrusions 241 is angular, with the top angle facing the spiral contraction direction. When the high-temperature flue gas flows into the spiral plate 24 and contacts the protrusions 241, the protrusions 241 can instantly increase the flow rate of the high-temperature flue gas, so that the high-temperature flue gas can more fully exchange heat with the oil in the spiral plate 24. This flow rate impact helps to blow and reduce the particles attached to the inner wall of the spiral plate 24, and at the same time, a small range of eddies are formed, so that the heat exchange temperature of the high-temperature flue gas is more uniform, and the high-temperature flue gas can more fully exchange heat with the oil in the spiral plate, and a small amount of particles can fall into the closed box 22. The small amount of particles that fall can enter the discharge pipe 27 with the blowing of the high-temperature flue gas, and no accumulation will occur.

[0053] The design of the inner cavity 243 opened inside the protrusion 241 allows the high-temperature flue gas to heat the protrusion 241 when it contacts the protrusion 241, and then heats the oil in the inner cavity 243, thereby improving the overall heat exchange effect. Moreover, since the inner cavity 243 is connected with the spiral groove 242, the oil will enter the inner cavity 243 to form a vortex and generate agitation when flowing in the spiral groove 242. This agitation helps the oil to complete the heat exchange more fully, makes the oil heated more evenly, and improves the heat exchange efficiency.

[0054] like Figure 1 , Fig.10 As shown, and a scraping assembly 30 assembled on the top of the closed cover plate 222, one end of the scraper 35 included in the scraping assembly 30 slides through the closed cover plate 222 and the power assembly 40, the surface of the closed cover plate 222 is penetrated by a slot 221, the inner wall of the slot 221 is connected to two rubber sheets, both sides of the scraper 35 are slidably connected to the rubber sheets, the setting of the rubber sheets reduces the outflow of high-temperature smoke in the closed box 22, the sealing sheet and the rubber sheet are made of high-temperature resistant materials, and the scraper 35 is pressed down by the power assembly 40 to make the scraper One end of 35 slides and scrapes the adsorbed matter on the inner wall of the spiral plate 24 to avoid the accumulation of particles on the inner wall of the spiral plate 24. The scraping assembly 30 also includes two support rods 31 fixedly installed on the top of the closed cover plate 222. The outer periphery of the support rod 31 is slidably connected to a connecting disk 33, and the bottom of the connecting disk 33 is connected to a scraper 35. The scraper 35 is also configured to be spiral and fits against the inner wall of the spiral plate 24. The top of the support rod 31 is connected to a limit plate 32 for limiting the movement of the connecting disk 33, and the outer periphery of the support rod 31 is sleeved with a pressure spring 34.

[0055] In order to prevent a large amount of particulate matter from adhering to the inner wall of the spiral plate 24 and causing a decrease in the high-temperature flue gas conduction efficiency, the scraper 35 is driven downward by pressing down the connection plate 33, so that the connection plate 33 moves downward along the support rod 31 and squeezes the pressure spring 34. Since the scraper 35 fits the inner wall of the spiral plate 24, the descent of the scraper 35 can scrape the particulate matter adhering to the inner wall of the spiral plate 24, so that the particulate matter falls into the closed box 22 and enters the discharge pipe 27 with the flow of flue gas;

[0056] As the downward pressure is removed, the pressure spring 34 in the squeezed state rebounds and pushes the connecting plate 33 to move upward along the support rod 31 to return to its original position.

[0057] like Figure 1 , Fig.10 , Fig.12 As shown, the periphery of the closed box 22 is connected to a power assembly 40, and the power assembly 40 includes a connecting plate 41 installed on the periphery of the closed box 22. The two connecting plates 41 are connected by a connecting column 42. A hydraulic cylinder 43 is installed on the top of the connecting column 42. The bottom end of the hydraulic cylinder 43 is connected to a hydraulic rod 44. One end of the hydraulic rod 44 passes through the connecting plate 41 and is connected to a lower pressure plate 45. The bottom end of the lower pressure plate 45 is in contact with the connecting plate 33.

[0058] When scraping off the particles attached to the inner wall of the spiral plate 24 , the particles on the inner wall of the spiral plate 24 are scraped off by starting the hydraulic cylinder 43 to drive the hydraulic rod 44 to move, and the hydraulic rod 44 pushes the lower pressing plate 45 to press down the connecting plate 33 .

[0059] like Figure 7 , Fig. 9 , Fig.10 , Fig.11 As shown, a switch assembly 50 is connected to the bottom of the lower pressure plate 45, and the switch assembly 50 includes an extension plate 51 installed at the bottom of the lower pressure plate 45 and a closing plate 56 installed at the bottom of the feeding tube 27 through a rotating member. A mounting plate 52 is connected to one side of the extension plate 51, and a fixing column 53 is connected between the inner walls of the mounting plate 52. Two mounting blocks 55 are connected to the bottom of the closing plate 56, and the two mounting blocks 55 are connected by a fixing column 53, and the two fixing columns 53 are connected by a sleeve rod 54, and the sleeve rod 54 is rotatably connected to the two fixing columns 53.

[0060] As the lower pressure plate 45 descends, the extension plate 51 and the mounting plate 52 will be driven down. As the mounting plate 52 descends, the fixed column 53 connected to the mounting plate 52 pulls another fixed column 53 connected to the sleeve rod 54 to descend. The other fixed column 53 drives the closing plate 56 connected to the mounting block 55 to rotate with the rotating part as the center, and causes the particles accumulated in the discharge pipe 27 to fall out.

[0061] like Fig.10 , Fig.11 As shown, the rotating member includes a fixed block 561 fixedly installed on the outer periphery of the discharge pipe 27, a positioning rod 562 is fixedly connected between the inner walls of the fixed block 561, the positioning rod 562 is connected to a rotating sleeve block 564 through a torsion spring 563 sleeved on the outer periphery, and the rotating sleeve block 564 is connected to the closing plate 56.

[0062] As the closing plate 56 rotates, the rotating sleeve 564 connected to the closing plate 56 rotates along the outer circumference of the positioning rod 562 and squeezes the torsion spring 563;

[0063] As the lower pressure plate 45 moves upward, the lower pressure plate 45 drives the extension plate 51 and the mounting plate 52 to move upward together. When the pulling of the sleeve rod 54 is no longer carried out, the squeezed torsion spring 563 drives the rotating sleeve block 564 to rotate, and resets the closing plate 56 to fit the discharge pipe 27. By cooperating with the scraping assembly 30, the particles on the inner wall of the spiral plate 24 can be scraped off intermittently and the particles accumulated in the discharge pipe 27 can be discharged at the same time.

[0064] Working principle: First, oil is introduced into a plurality of dispersed spiral grooves 242 through the oil inlet pipe 26. At the same time, the smoke generated by the kiln 10 is guided into the closed box 22 through the ventilation pipe 11. In the closed box 22, the smoke flows along the straight plate 23 and the spiral plate 24. Through contact with these plates, the smoke transfers its high-temperature smoke to the spiral plate 24. While being heated, the spiral plate 24 conducts the high-temperature smoke to the spiral groove 242, thereby heating the flowing oil in the spiral groove 242.

[0065] Due to the rotating design of the spiral plate 24, the smoke will flow along its inner wall and fit with it, causing the particles in the smoke to gradually adhere to the inner wall surface of the spiral plate 24. In order to prevent excessive attachment of particles and affect the high-temperature smoke conduction efficiency, the hydraulic cylinder 43 is started, and the hydraulic rod 44 drives the lower pressure plate 45 to descend. The lower pressure plate 45 is connected to the connecting plate 33 and the scraper 35. As the lower pressure plate 45 descends, the connecting plate 33 moves downward along the support rod 31. Since the scraper 35 is tightly fitted with the inner wall of the spiral plate 24, the descending action of the scraper 35 can effectively scrape the particles attached to the inner wall of the spiral plate 24 and make them fall into the closed box 22.

[0066] At the same time, the descent of the lower pressure plate 45 will also drive the extension plate 51 and the mounting plate 52 down together. The fixed column 53 connected to the mounting plate 52 is connected to another fixed column 53 through a sleeve rod 54. As the mounting plate 52 descends, the fixed column 53 away from the mounting plate 52 drives the closing plate 56 connected to the mounting block 55 to rotate with the rotating part as the center. The rotating action of the closing plate 56 can make the particles accumulated in the discharge pipe 27 slide down, so that it can be discharged smoothly.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-efficiency heat exchanger for kiln heat recovery, comprising a kiln (10) and a ventilation pipe (11) installed on one side of the kiln (10), characterized in that: Also includes: A heat exchange mechanism (20) is mounted on one side of a ventilation pipe (11), the heat exchange mechanism (20) comprising a closed box (22) and a closed cover plate (222), the interior of the closed box (22) being connected to a straight plate (23), the interior of the closed box (22) being provided with a spiral plate (24), the straight plate (23) being in contact with the outer periphery of the spiral plate (24), the outer periphery of the spiral plate (24) being connected to a plurality of protrusions (241), the interior of the spiral plate (24) being provided with a plurality of spiral protrusions (242). Grooves (242), a plurality of spiral grooves (242) are vertically arranged in the spiral plate (24), an inner cavity (243) is opened inside each protrusion (241), and the inner cavity (243) is communicated with the spiral grooves (242), the input ends of the plurality of spiral grooves (242) are connected to an oil inlet pipe (26), and the output ends are connected to an oil outlet pipe (25), the bottom of the closed box (22) is connected to a feed pipe (27), and the outer periphery of the feed pipe (27) is communicated with an air outlet pipe (28); And a scraping assembly (30) mounted on the top of the closed cover plate (222), wherein one end of a scraper (35) included in the scraping assembly (30) slides through the closed cover plate (222) and the power assembly (40), and the scraper (35) is pressed down by the power assembly (40) so that one end of the scraper (35) slides and scrapes the adsorbed matter on the inner wall of the spiral plate (24).

2. A high-efficiency heat exchanger for kiln hot gas recovery according to claim 1, characterized in that: The scraping assembly (30) further comprises two support rods (31) fixedly mounted on the top of the closed cover plate (222); the outer periphery of the support rods (31) is slidably connected to a connecting disk (33); the bottom of the connecting disk (33) is connected to a scraper (35); the top of the support rods (31) is connected to a limiting plate (32) for limiting the movement of the connecting disk (33); and the outer periphery of the support rods (31) is sleeved with a pressure spring (34).

3. The high-efficiency heat exchanger for kiln hot gas recovery according to claim 2 is characterized in that: The outer periphery of the closed box (22) is connected to a power assembly (40), the power assembly (40) comprising a connecting plate (41) mounted on the outer periphery of the closed box (22), the two connecting plates (41) being connected via a connecting column (42), a hydraulic cylinder (43) being mounted on the top of the connecting column (42), a hydraulic rod (44) being connected to the bottom end of the hydraulic cylinder (43), one end of the hydraulic rod (44) passing through the connecting plate (41) and being connected to a lower pressing plate (45), the bottom end of the lower pressing plate (45) being in contact with the connecting plate (33).

4. The high-efficiency heat exchanger for kiln hot gas recovery according to claim 3 is characterized in that: The bottom of the lower pressing plate (45) is connected to a switch assembly (50), the switch assembly (50) comprising an extension plate (51) mounted on the bottom of the lower pressing plate (45) and a closing plate (56) mounted on the bottom of the feeding tube (27) via a rotating member, one side of the extension plate (51) is connected to a mounting plate (52), and a fixing column (53) is connected between the inner walls of the mounting plate (52), and the bottom of the closing plate (56) is connected to two mounting blocks (55), the two mounting blocks (55) are connected via a fixing column (53), the two fixing columns (53) are connected via a sleeve rod (54), and the sleeve rod (54) is rotatably connected to the two fixing columns (53).

5. The high-efficiency heat exchanger for kiln hot gas recovery according to claim 4, characterized in that: The rotating member comprises a fixed block (561) fixedly mounted on the outer periphery of the feed tube (27); a positioning rod (562) is fixedly connected between the inner walls of the fixed block (561); the positioning rod (562) is connected to a rotating sleeve block (564) via a torsion spring (563) sleeved on the outer periphery; and the rotating sleeve block (564) is connected to the closing plate (56).

6. The high-efficiency heat exchanger for kiln hot gas recovery according to claim 1, characterized in that: The heat exchange mechanism (20) further comprises a support frame (21) installed at the bottom of the closed box (22), the bottom of the support frame (21) being in contact with the ground, and a connecting piece being connected between the straight plate (23) and the ventilation pipe (11).

7. The high-efficiency heat exchanger for kiln hot gas recovery according to claim 6, characterized in that: The connecting member comprises a connecting plate (12) installed on one side of the ventilation pipe (11) and the two straight plates (23), and the two connecting plates (12) are connected and fixed by connecting screws (13) and connecting nuts (14).

8. The high-efficiency heat exchanger for kiln hot gas recovery according to claim 1, characterized in that: A groove (221) is formed through the surface of the closed cover plate (222), and the inner wall of the groove (221) is connected to two rubber sheets, and both sides of the scraper (35) are slidably connected to the rubber sheets.

9. The high-efficiency heat exchanger for kiln hot gas recovery according to claim 1, characterized in that: The horizontal cross section of the protrusion (241) is angular, with the top angle facing the spiral contraction direction.

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