A chemical equipment with a waste heat recovery device

Abstract

This invention discloses a chemical equipment with a waste heat recycling device, relating to the field of waste heat recycling technology. It includes several heat exchange plates forming a waste heat collection mechanism. The first heat exchange plate is installed on the inner wall of the flue gas pipe, and other heat exchange plates are spaced apart and moved closer to the first heat exchange plate under the action of an adjustment mechanism. A cleaning plate with an iron block is provided on the upper end of the side wall of each heat exchange plate, and an installation cylinder with a magnetic block slidingly disposed inside is installed on the lower end of the side wall. The heat exchange plates are connected to a pressing push rod that presses the magnetic blocks of adjacent heat exchange plates out of the installation cylinder. This invention adjusts the heat exchange effect between the heat exchange plates and the high-temperature flue gas by changing the spacing between adjacent heat exchange plates using an adjustment mechanism, thereby meeting the fluctuating heat demand of the heat-using equipment. The installation cylinder, pressing push rod, magnetic block, and iron block allow the cleaning plate to slide downwards to scrape away dust from the side walls of the heat exchange plates, preventing dust from adhering to the side walls and affecting the heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of waste heat recycling technology, specifically to a chemical equipment with a waste heat recycling device. Background Technology

[0002] Existing waste heat recovery devices for chemical boilers suffer from low heat exchange efficiency due to the rapid rise of high-temperature flue gas, resulting in significant underutilization of waste heat. Furthermore, these devices fail to account for the presence of corrosive gases like SO2 in the boiler emissions, which can damage critical components, leading to high failure rates and short lifespans. Additionally, the recovered waste heat is not directly used in boiler production, and the high manual labor required results in low economic returns.

[0003] In the prior art, a waste heat recovery device for chemical boiler flue gas, disclosed in publication number "CN209042430U", includes a flue gas pipe and a boiler feedwater tank. The flue gas pipe has a flue gas inlet reducer at the bottom and a flue gas outlet reducer at the top. A support is welded to the inner wall at the bottom of the flue gas pipe, and a heat exchanger is welded to the top of the support. The heat exchanger inlet is connected to the circulating outlet via a first water pump, and the circulating outlet is connected to the heat exchanger outlet via a second water pump. A control switch is located at the center of the top of the boiler feedwater tank, and a feedwater inlet is located on the right side of the top of the boiler feedwater tank. This device improves the recovery and utilization rate of waste heat from the boiler flue gas. At the same time, the device has a low failure rate and high efficiency in production and use, and has strong practical applicability and promotion potential.

[0004] However, existing technologies still have significant drawbacks. For example, the heat exchangers in existing technologies are fixed inside the flue gas pipe for heat exchange, and the heat exchange capacity is only controlled by the flue gas flow rate and temperature, rather than being able to adjust the heat exchange capacity according to actual needs. Furthermore, dust in the flue gas adheres to the outer wall of the heat exchanger during flow, which over time greatly reduces the heat exchange efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a chemical equipment with a waste heat recovery device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A chemical equipment with a waste heat recovery device includes a waste heat recovery mechanism and a waste heat collection mechanism located in the flue gas pipe of a chemical boiler. The heat exchange fluid circulates between the waste heat collection mechanism and the waste heat recovery mechanism through a circulation pipeline for heat exchange. The waste heat collection mechanism includes several heat exchange plates arranged vertically and with internal cavities. The heat exchange plates are equipped with liquid inlet and liquid outlet communicating with the cavities. The heat exchange plate at the first end is fixedly installed on the inner wall of the flue gas pipe. The other heat exchange plates are movably arranged and spaced apart in sequence along the direction away from the first end. An elastic support rod is fixedly connected between adjacent heat exchange plates. The movably arranged heat exchange plates slide towards the heat exchange plate at the first end under the drive of the adjustment mechanism.

[0008] A fixed support plate is fixedly connected to the upper side wall of the heat exchange plate near the adjacent heat exchange plate, and an elastic pull block is fixedly connected between the fixed support plate and the cleaning plate slidably disposed below it. An installation cylinder is fixedly installed at the lower side wall of the heat exchange plate on which the fixed support plate is installed, and the end of the installation cylinder facing the heat exchange plate is open, and a gap is left between the installation cylinder and the heat exchange plate. A magnetic block is slidably disposed inside the installation cylinder, and the magnetic block is connected to an elastic pull rod that pulls it back into the installation cylinder. The heat exchange plate is fixedly connected to a pressing push rod that slides into the installation cylinder of the adjacent heat exchange plate and pushes the magnetic block out of the installation cylinder. An iron block that is magnetically attracted to the magnetic block is fixedly connected to the lower end of the cleaning plate.

[0009] Preferably, a fixing rod is fixedly connected to the lower end of the heat exchange plate, and a dust collection plate is fixedly connected to the lower end of the fixing rod. When the heat exchange plates approach each other until the dust collection plates contact each other, the magnetic block extends out of the mounting cylinder under the push of the extrusion push rod and attracts the iron block. A negative pressure pump with a dust extraction pipe is installed outside the flue pipe, and a through hole is opened on the side wall of the flue pipe near the first end heat exchange plate. The through hole is located above the dust collection plate and communicates with the dust extraction pipe.

[0010] Preferably, the elastic support rod is fixedly connected between the fixed connecting rods on adjacent heat exchange plates.

[0011] Preferably, the two opposite sidewalls of the dust collection plate are fixedly connected with upwardly extending side wing baffles.

[0012] Preferably, when the heat exchange plates approach each other until the dust collection plates contact each other, the cleaning plate is slidably clamped between the adjacent heat exchange plates, and several cleaning brushes are fixedly connected to both ends of the cleaning plate extending toward the adjacent heat exchange plates.

[0013] Preferably, the mounting cylinder is fixedly connected to a mounting cylinder connecting rod, and the mounting cylinder connecting rod is fixedly connected to the side wall of the heat exchange plate.

[0014] Preferably, each of the heat exchange plates is fixedly connected to a first connecting ear plate, and the first connecting ear plate on the end heat exchange plate is fixedly connected to a threaded drive rod. The threaded drive rod passes through the first connecting ear plates on other heat exchange plates in sequence and slides out of the exhaust pipe under the limitation of the limiting mechanism. The threaded drive rod slides out of the exhaust pipe and is rotatably sleeved with an internal threaded cylinder that rotates under the drive of a rotary drive motor.

[0015] Preferably, a rotary drive motor output end fixedly installed outside the exhaust pipe is equipped with a rotary gear, and both ends of the rotary gear are fixedly connected to limit ring plates. The internal threaded cylinder is clamped between the two limit ring plates, and the outer side of the internal threaded cylinder is fixedly connected to gear teeth that mesh with the rotary gear.

[0016] Preferably, the limiting mechanism includes a second connecting ear plate fixedly connected to the heat exchange plate and a guide slide rod, with one end of the guide slide rod fixedly connected to the second connecting ear plate on the end heat exchange plate, and the other end of the guide slide rod slidingly passing through the second connecting ear plates on other heat exchange plates and slidingly extending out of the exhaust pipe.

[0017] Preferably, both ends of the exhaust pipe are fixedly connected to a reducing pipe whose inner diameter decreases along the direction away from the exhaust pipe.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The chemical equipment of the present invention, which has a waste heat recovery device, adjusts the heat exchange effect between the heat exchange plates and the high-temperature flue gas by setting an adjustment mechanism to change the spacing between adjacent heat exchange plates, thereby meeting the fluctuating heat demand of the heat-using equipment. Through the coordinated arrangement of the mounting cylinder, the extrusion push rod, the magnetic block, the cleaning plate and the iron block, the cleaning plate slides downward to scrape off the dust on the side wall of the heat exchange plate, thus avoiding the problem of dust adhering to the side wall of the heat exchange plate and affecting its heat exchange efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram showing multiple heat exchange plates being far apart from each other in this invention;

[0021] Figure 2 for Figure 1 Enlarged schematic diagram of the upper structure of the heat exchange plate;

[0022] Figure 3 for Figure 1 Enlarged schematic diagram of the lower structure of the heat exchanger plate;

[0023] Figure 4 This is a three-dimensional structural diagram of the intermediate heat exchange plate of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the end heat exchange plate of the present invention;

[0025] Figure 6 for Figure 5 Side view of the heat exchanger plate;

[0026] Figure 7 This is a schematic diagram showing multiple heat exchange plates close to each other in this invention;

[0027] Figure 8 for Figure 7 A magnified diagram showing the attraction of a magnetic block to an iron block.

[0028] In the diagram: 1. Exhaust pipe, 101. Reducing pipe, 2. Heat exchange plate, 3. Elastic support rod, 4. Liquid inlet, 5. Liquid outlet, 6. Fixed support plate, 7. Elastic pull block, 8. Cleaning plate, 81. Cleaning brush, 9. Mounting cylinder, 91. Through hole, 10. Magnetic block, 11. Elastic pull rod, 12. Extrusion push rod, 13. Iron block, 14. Fixed connecting rod, 15. Ash collection plate, 16. Negative pressure pump, 17. Ash extraction pipe, 18. Side wing baffle, 19. Mounting cylinder connecting rod, 20. Threaded transmission rod, 21. First connecting lug plate, 22. Internal threaded cylinder, 23. Rotary drive motor, 24. Rotary gear, 241. Limiting ring plate, 25. Guide slide rod, 26. Second connecting lug plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-8 The present invention provides a technical solution:

[0031] Example 1:

[0032] A chemical equipment with a waste heat recovery device includes a waste heat recovery mechanism and a waste heat collection mechanism located in the flue gas pipe 1 of a chemical boiler. The heat exchange fluid circulates between the waste heat collection mechanism and the waste heat recovery mechanism through a circulation pipeline to exchange heat. The heat exchange fluid can be a non-toxic and harmless liquid such as water. The heat exchange fluid absorbs heat in the waste heat collection mechanism in the flue gas pipe 1 through heat exchange, and then enters the waste heat recovery mechanism to transfer the heat to the heat-using equipment, thereby realizing the effect of recovering the waste heat of high-temperature flue gas in the flue gas pipe 1.

[0033] The exhaust pipe 1 is arranged vertically. High-temperature flue gas enters the exhaust pipe 1 through the lower end of the exhaust pipe 1 and is discharged through the upper end of the exhaust pipe 1. Both the upper and lower ends of the exhaust pipe 1 are fixedly connected to a reducing pipe 101 whose inner diameter decreases in the direction away from the exhaust pipe 1. The setting of the reducing pipe 101 allows the high-temperature flue gas to diffuse in the exhaust pipe 1 and delays the residence time of the high-temperature flue gas in the exhaust pipe 1. This allows the waste heat collection mechanism located inside the exhaust pipe 1 to fully absorb the heat of the high-temperature flue gas, thereby improving the heat exchange effect of the waste heat collection mechanism and thus improving the waste heat utilization efficiency.

[0034] The waste heat collection mechanism includes several heat exchange plates 2 arranged vertically and with cavities inside. In this embodiment, there are 5 heat exchange plates 2 arranged at intervals from left to right. The heat exchange plates 2 are equipped with a liquid inlet 4 and a liquid outlet 5 that communicate with the cavity. The liquid inlet 4 is located at the front end of the heat exchange plate 2 and is connected to the water supply end of the circulation pipeline. The liquid outlet 5 is located at the rear end of the heat exchange plate 2 and is connected to the water inlet end of the circulation pipeline. This allows the heat exchange fluid to enter the cavity of the heat exchange plate 2 through the water supply end of the circulation pipeline and the liquid inlet 4. The high-temperature flue gas flows through the heat exchange plate 2 and exchanges heat with the heat exchange fluid in the cavity of the heat exchange plate 2. After absorbing heat, the heat exchange fluid flows out of the cavity of the heat exchange plate 2 and enters the water inlet end of the circulation pipeline through the liquid outlet 5.

[0035] The first heat exchange plate 2 is fixedly installed on the inner wall of the exhaust pipe 1, that is, the leftmost heat exchange plate 2 is fixedly installed on the inner wall of the exhaust pipe 1. For example, the leftmost heat exchange plate 2 can be fixedly installed on the inner wall of the exhaust pipe 1 with bolts. Other heat exchange plates 2 are movably arranged and spaced apart in sequence along the direction away from the first heat exchange plate 2. And an elastic support rod 3 is fixedly connected between adjacent heat exchange plates 2. Under the push of the elastic support rod 3, the adjacent heat exchange plates 2 move away from each other, so that the distance between adjacent heat exchange plates 2 is large, ensuring that the high-temperature flue gas and the heat exchange plates 2 are kept close together. The heat exchanger has a high efficiency, and the movable heat exchanger 2 slides towards the heat exchanger 2 at the head end under the action of the adjustment mechanism. When the heat-using equipment does not need too much heat, the adjustment mechanism works and drives the movable heat exchanger 2 to slide towards the heat exchanger 2 at the head end. The elastic support rod 3 is compressed, and the distance between adjacent heat exchangers 2 is reduced, thereby reducing the heat exchange effect between the high-temperature flue gas and the heat exchanger 2, achieving the effect of targeted adjustment of the heat exchanger 2, so as to meet the changing heat demand of the heat-using equipment.

[0036] In one embodiment, each of the five heat exchange plates 2 is fixedly connected to a first connecting lug 21, and the first connecting lug 21 on the end heat exchange plate 2 is fixedly connected to a threaded transmission rod 20. That is, the first connecting lug 21 on the rightmost heat exchange plate 2 is fixedly connected to a threaded transmission rod 20, and the threaded transmission rod 20 passes through the first connecting lug 21 on the other heat exchange plates 2 in sequence and slides out of the exhaust pipe 1 under the limitation of the limiting mechanism. The threaded transmission rod 20 is rotatably sleeved on the outside of the rod body that slides out of the exhaust pipe 1, and an internal threaded cylinder 22 that rotates under the drive of the rotary drive motor 23 is mounted on it. When it is necessary to reduce the heat exchange effect of heat exchange plate 2, the rotary drive motor 23 works and drives the internal threaded cylinder 22 to rotate. The threaded transmission rod 20 cannot rotate with the internal threaded cylinder 22 under the restriction of the limiting mechanism, so the threaded transmission rod 20 slides to the left under the action of threaded engagement. The threaded transmission rod 20 drives the rightmost heat exchange plate 2 to slide to the left together. The rightmost heat exchange plate 2 transmits force through multiple elastic support rods 3, so that the elastic support rods 3 are compressed and the distance between adjacent heat exchange plates 2 is reduced, thereby reducing the heat exchange effect between high temperature flue gas and heat exchange plate 2.

[0037] Specifically, a rotary drive motor 23 fixedly installed outside the exhaust pipe 1 has a rotary gear 24 installed at its output end. The outer side of the internal threaded cylinder 22 is fixedly connected with gear teeth that mesh with the rotary gear 24. The rotary drive motor 23 drives the rotary gear 24 to rotate together. The rotary gear 24 drives the internal threaded cylinder 22 to rotate together through the meshing of the gear teeth. Both ends of the rotary gear 24 are fixedly connected with limit ring plates 241, and the internal threaded cylinder 22 is clamped between the two limit ring plates 241. The two limit ring plates 241 limit the internal threaded cylinder 22, so that the internal threaded cylinder 22 can only rotate and cannot move laterally, thus avoiding the problem of the internal threaded cylinder 22 deviating.

[0038] Specifically, the limiting mechanism includes a second connecting ear plate 26 fixedly connected to each of the five heat exchange plates 2 and a guide slide rod 25. One end of the guide slide rod 25 is fixedly connected to the end heat exchange plate 2, that is, the guide slide rod 25 is fixedly connected to the second connecting ear plate 26 on the rightmost heat exchange plate 2, and the other end of the guide slide rod 25 slides through the second connecting ear plates 26 on the other heat exchange plates 2 in sequence and slides out of the exhaust pipe 1. The setting of the second connecting ear plate 26 and the guide slide rod 25 makes it impossible for the heat exchange plates 2 to rotate, thereby making it impossible for the threaded transmission rod 20 to rotate, thus achieving the limiting and guiding effect on the movement of the threaded transmission rod 20.

[0039] Example 2:

[0040] Example 2 adds a scraping mechanism for the heat exchange plate 2 based on Example 1. Specifically, a fixed support plate 6 is fixedly connected to the upper end of the side wall of the heat exchange plate 2 near the adjacent heat exchange plate 2. An elastic pull block 7 is fixedly connected between the fixed support plate 6 and a cleaning plate 8 slidably disposed below it. The cleaning plate 8 is stably held at the upper end of the side wall of the heat exchange plate 2 by the pull of the elastic pull block 7. An installation cylinder 9 is fixedly installed at the lower end of the side wall of the heat exchange plate 2 where the fixed support plate 6 is installed. That is, the fixed support plate 6 and the installation cylinder 9 are fixedly installed on the same side wall of the heat exchange plate 2. The end of the installation cylinder 9 facing the heat exchange plate 2 is open, and there is a gap between the installation cylinder 9 and the heat exchange plate 2. There is a gap, specifically, the mounting cylinder 9 is fixedly connected to the mounting cylinder connecting rod 19, and the mounting cylinder connecting rod 19 is fixedly connected to the side wall of the heat exchange plate 2. A magnetic block 10 is slidably arranged inside the mounting cylinder 9, and the magnetic block 10 is connected to an elastic pull rod 11 that pulls it back into the mounting cylinder 9. The heat exchange plate 2 is fixedly connected to a pressing push rod 12 that slides into the mounting cylinder 9 of the adjacent heat exchange plate 2 and pushes the magnetic block 10 out of the mounting cylinder 9. The elastic pull rod 11 is fixedly connected between the magnetic block 10 and the inner wall of the mounting cylinder 9 away from its opening, and a through hole 91 is opened at the end of the mounting cylinder 9 away from its opening for the pressing push rod 12 to slide into.

[0041] An iron block 13, which is magnetically attracted to the magnetic block 10, is fixedly connected to the lower end of the cleaning plate 8. The magnetic block 10 retracts into the mounting cylinder 9 under the pull of the elastic rod 11, preventing the magnetic block 10 from prematurely extending out of the mounting cylinder 9 and attracting the iron block 13. When the heat exchange plates 2 accumulate excessive dust after prolonged use, they move closer together under the pull of the adjustment mechanism. The pressing push rod 12 on one heat exchange plate 2 inserts into the mounting cylinder 9 on the other heat exchange plate 2. Adjacent heat exchange plates 2 continue to move closer together, causing the pressing push rod 12 to push the magnetic block 10 out of the mounting cylinder 9. The magnetic block 10 extending out of the mounting cylinder 9 attracts the iron block. 13 moves downwards, and the iron block 13 drives the cleaning plate 8 to slide downwards together. The elastic pull block 7 is stretched. During the downward sliding process, the cleaning plate 8 scrapes away the dust adhering to the side wall of the heat exchange plate 2, avoiding the problem that the heat exchange efficiency is affected by the dust adhering to the side wall of the heat exchange plate 2. After the dust is scraped off, the adjustment mechanism moves in the opposite direction to reset. The heat exchange plate 2 moves in the opposite direction to reset under the elastic action of the elastic support rod 3, so that the pressing push rod 12 leaves the mounting cylinder 9. The magnetic block 10 is pulled back into the mounting cylinder 9 under the elastic pull of the elastic pull rod 11. The iron block 13 loses its magnetic attraction. The cleaning plate 8 slides in the opposite direction to reset under the pull of the elastic pull block 7.

[0042] Example 3:

[0043] Example 3 adds a mechanism for collecting ash, based on Example 2. Specifically, a fixed connecting rod 14 is fixedly connected to the lower end of the heat exchange plate 2, and an elastic support rod 3 is fixedly connected between the fixed connecting rods 14 on adjacent heat exchange plates 2. An ash collection plate 15 is fixedly connected to the lower end of the fixed connecting rod 14. When ash removal is required, the chemical boiler is shut off to prevent flue gas from entering the exhaust pipe 1. An adjusting mechanism pulls the heat exchange plates 2 closer together until the ash collection plates 15 contact each other. The magnetic block 10 extends under the push of the compression push rod 12. The installation cylinder 9 attracts the iron block 13, causing the cleaning plate 8 to slide downwards and scrape off the dust under the action of the iron block 13. The dust that is hung down falls onto the dust collection plate 15. A negative pressure pump 16 with a dust extraction pipe 17 is installed outside the flue pipe 1. A through hole is opened on the side wall of the flue pipe 1 near the first end heat exchange plate 2. The through hole is located above the dust collection plate 15 and is connected to the dust extraction pipe 17. The negative pressure pump 16 generates negative pressure and extracts the dust from the dust collection plate 15 through the dust extraction pipe 17, thus avoiding the problem of dust falling into the lower end of the flue pipe 1.

[0044] Furthermore, the front and rear opposite side walls of the dust collection plate 15 are fixedly connected with upwardly extending side wing baffles 18. The side wing baffles 18 are set to block dust and prevent dust from sliding off the dust collection plate 15. When the heat exchange plates 2 approach each other until the dust collection plates 15 contact each other, the cleaning plate 8 slides and clamps between the adjacent heat exchange plates 2. Several cleaning brushes 81 are fixedly connected to both ends of the cleaning plate 8 extending towards the adjacent heat exchange plates 2. The setting of the cleaning brushes 81 improves the dust removal effect on the heat exchange plates 2.

[0045] Working principle: When the heat-using equipment does not require too much heat, the adjustment mechanism works and drives the movable heat exchange plate 2 to slide towards the heat exchange plate 2 at the head end. The elastic support rod 3 is compressed, and the distance between adjacent heat exchange plates 2 is reduced, thereby reducing the heat exchange effect between high-temperature flue gas and heat exchange plate 2, and achieving the effect of targeted adjustment of the heat exchange capacity of heat exchange plate 2.

[0046] When the heat exchange plates 2 accumulate too much dust after prolonged use, the heat exchange plates 2 move closer to each other under the pull of the adjustment mechanism. The pressing push rod 12 on one heat exchange plate 2 is inserted into the mounting cylinder 9 on the other heat exchange plate 2. The adjacent heat exchange plates 2 continue to move closer to each other, causing the pressing push rod 12 to push the magnetic block 10 out of the mounting cylinder 9. The magnetic block 10 extending out of the mounting cylinder 9 attracts the iron block 13 to move downward. The iron block 13 drives the cleaning plate 8 to slide downward together. The elastic pull block 7 is stretched. During the downward sliding process, the cleaning plate 8 scrapes away the dust adhering to the side wall of the heat exchange plate 2.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chemical equipment with a waste heat recovery device, comprising a waste heat recovery mechanism and a waste heat collection mechanism located in the flue gas pipe of a chemical boiler, wherein a heat exchange fluid circulates between the waste heat collection mechanism and the waste heat recovery mechanism through a circulation pipeline for heat exchange, characterized in that: The waste heat collection mechanism includes several heat exchange plates arranged vertically and with internal cavities. Each heat exchange plate is equipped with a liquid inlet and a liquid outlet that communicate with the cavity. The heat exchange plate at the first end is fixedly installed on the inner wall of the flue pipe. Other heat exchange plates are movably arranged and spaced apart in sequence along the direction away from the first end. Elastic support rods are fixedly connected between adjacent heat exchange plates. The movably arranged heat exchange plates slide towards the heat exchange plate at the first end under the action of the adjustment mechanism. A fixed support plate is fixedly connected to the upper end of the side wall of the heat exchange plate near the adjacent heat exchange plate, and an elastic pull block is fixedly connected between the fixed support plate and the cleaning plate slidably disposed below it. An installation cylinder is fixedly installed at the lower end of the side wall of the heat exchange plate on which the fixed support plate is installed, and the end of the installation cylinder facing the heat exchange plate is open, and a gap is left between the installation cylinder and the heat exchange plate. A magnetic block is slidably disposed inside the installation cylinder, and the magnetic block is connected to an elastic pull rod that pulls it back into the installation cylinder. The heat exchange plate is fixedly connected to a pressing push rod that slides into the installation cylinder of the adjacent heat exchange plate and pushes the magnetic block out of the installation cylinder. An iron block that is magnetically attracted to the magnetic block is fixedly connected to the lower end of the cleaning plate. A fixed connecting rod is fixedly connected to the lower end of the heat exchange plate, and a dust collection plate is fixedly connected to the lower end of the fixed connecting rod. When the heat exchange plates approach each other until the dust collection plates contact each other, the magnetic block extends out of the mounting cylinder under the push of the extrusion push rod and attracts the iron block. A negative pressure pump with a dust extraction pipe is installed outside the flue pipe. A through hole is opened on the side wall of the flue pipe near the first end heat exchange plate. The through hole is located above the dust collection plate and is connected to the dust extraction pipe. When the heat exchange plates approach each other until the dust collection plates come into contact with each other, the cleaning plate slides between the adjacent heat exchange plates, and several cleaning brushes are fixedly connected to both ends of the cleaning plate extending toward the adjacent heat exchange plates.

2. The chemical equipment with a waste heat recovery device according to claim 1, characterized in that: The elastic support rod is fixedly connected between the fixed connecting rods on the adjacent heat exchange plates.

3. The chemical equipment with a waste heat recovery device according to claim 1, characterized in that: The dust collection plate has upwardly extending side wing baffles fixedly connected to its two opposite side walls.

4. The chemical equipment with a waste heat recovery device according to claim 1, characterized in that: The mounting cylinder is fixedly connected to a mounting cylinder connecting rod, and the mounting cylinder connecting rod is fixedly connected to the side wall of the heat exchange plate.

5. The chemical equipment with a waste heat recovery device according to claim 1, characterized in that: Each heat exchange plate is fixedly connected to a first connecting ear plate, and the first connecting ear plate on the end heat exchange plate is fixedly connected to a threaded drive rod. The threaded drive rod passes through the first connecting ear plates on other heat exchange plates in sequence and slides out of the exhaust pipe under the limitation of the limiting mechanism. The threaded drive rod slides out of the exhaust pipe and is rotatably sleeved with an internal threaded cylinder that rotates under the drive of a rotary drive motor.

6. The chemical equipment with a waste heat recovery device according to claim 5, characterized in that: A rotating gear is installed at the output end of the rotary drive motor, which is fixedly installed outside the exhaust pipe. Both ends of the rotating gear are fixedly connected to limit ring plates. The internal threaded cylinder is clamped between the two limit ring plates, and gear teeth that mesh with the rotating gear are fixedly connected to the outside of the internal threaded cylinder.

7. The chemical equipment with a waste heat recovery device according to claim 5, characterized in that: The limiting mechanism includes a second connecting ear plate fixedly connected to the heat exchange plate and a guide slide rod. One end of the guide slide rod is fixedly connected to the second connecting ear plate on the end heat exchange plate, and the other end of the guide slide rod slides through the second connecting ear plates on other heat exchange plates and slides out of the exhaust pipe.

8. The chemical equipment with a waste heat recovery device according to claim 1, characterized in that: Both ends of the exhaust pipe are fixedly connected to reducer pipes whose inner diameter decreases along the direction away from the exhaust pipe.

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