Waste heat recovery and cyclic utilization device for activated carbon processing and use method of waste heat recovery and cyclic utilization device

Abstract

The invention belongs to the technical field of waste heat utilization devices, particularly relates to a waste heat recovery and cyclic utilization device for activated carbon processing and a use method, and provides the following scheme aiming at the problems that an existing waste heat boiler cannot completely absorb waste heat in tail gas, and dust in the tail gas is attached to the inner wall of a heat exchange pipeline to affect the heat exchange efficiency. Comprising a first heat exchange box, a bag-type dust collector is arranged on one side of the first heat exchange box and used for filtering tail gas entering the first heat exchange box, and a connecting pipe is fixed to the side, away from the first heat exchange box, of the bag-type dust collector and used for being communicated with an activated carbon activation furnace. Tail gas sequentially enters the first heat exchange box and the second heat exchange box to be subjected to heat conversion twice, waste heat of the tail gas is fully utilized, and dust and impurities attached to the inner walls of a conversion disc, a first hollow circular ring, a sealing ring, a spiral heat exchange pipe, a heat exchange plate and a straight heat exchange pipe can be easily cleaned; the influence on heat exchange efficiency after dust accumulation is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of devices for utilizing waste heat, and in particular to a waste heat recovery and recycling device for activated carbon processing and a use method thereof. Background Art

[0002] Activated carbon is a specially treated carbon with numerous tiny pores on its surface. Even a small amount of activated carbon has a huge surface area. The wide application of activated carbon is almost all based on this feature. When the activated carbon is processed in the activation furnace, the activation furnace will discharge a large amount of high-temperature exhaust gas. Therefore, the activated carbon activation furnace is basically equipped with a waste heat recovery circulation device, that is, the waste heat in the exhaust gas is absorbed by the waste heat boiler to generate steam, and the generated steam is returned to the activation furnace for use, so as to achieve the purpose of recycling and reusing the waste heat.

[0003] The existing technology still has the following disadvantages in the process of recycling waste heat from activated carbon processing: 1. When recycling waste heat, the waste heat boiler cannot completely absorb the waste heat in the tail gas, resulting in part of the waste heat being discharged, resulting in heat loss; 2. During use, when the exhaust gas passes through the heat exchange pipe in the waste heat boiler, the dust and impurities in the exhaust gas will adhere to the inner wall of the pipe. At the same time, the exhaust gas condenses in the heat exchange pipe, and the dust in the condensed water will also adhere to the inner wall of the pipe. Over time, the thickness of the attached dust increases, affecting the heat exchange efficiency of the heat exchange pipe.

[0004] In response to the above problems, the present invention document proposes a waste heat recovery and recycling device for activated carbon processing and a method of use. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of existing waste heat boilers that cannot completely absorb waste heat in exhaust gas, and dust in the exhaust gas adheres to the inner wall of the heat exchange pipe, affecting the heat exchange efficiency of the heat exchange pipe, and to propose a waste heat recovery and recycling device for activated carbon processing and a method of use.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A waste heat recovery and recycling device for activated carbon processing, comprising a first heat exchange box, a bag dust collector is provided on one side of the first heat exchange box, used to filter the tail gas entering the first heat exchange box, a connecting pipe is fixed on the side of the bag dust collector away from the first heat exchange box, used to communicate with the activated carbon activation furnace, and a second heat exchange box is fixed on the top of the first heat exchange box, used to perform heat exchange on the tail gas; It also includes two conversion disks, both of which are arranged in the first heat exchange box, and a plurality of spiral heat exchange tubes are fixed on one side of the two conversion disks close to each other, and the conversion disks cooperate with the spiral heat exchange tubes to perform the first heat exchange; It also includes a plurality of straight heat exchange tubes, which are all located in the second heat exchange box and are used for a second heat exchange; The rotating structure is arranged in the first heat exchange box and is used to drive the conversion disk and the spiral heat exchange tube to rotate to perform the first heat exchange; A lifting structure is arranged in the second heat exchange box and is used to stir the water in the second heat exchange box to perform a second heat exchange; The cleaning structure is arranged between the first heat exchange box and the second heat exchange box, and is used to remove dust and impurities attached to the inner wall of the spiral heat exchange tube and the conversion disk; The filtering structure is arranged on one side of the second heat exchange box and is used to filter the dust in the exhaust gas after the heat exchange again.

[0007] In a possible design, the rotating structure includes a first pipe and a second pipe, the ends of the first pipe and the second pipe close to each other are fixedly extended into the first heat exchange box and are respectively fixedly connected to the two conversion disks, and the end of the second pipe away from the conversion disk is rotatably connected to the air outlet of the bag dust collector, and the first and second hollow rings are respectively fixed to the inner walls of the first heat exchange box on both sides away from each other, and the two conversion disks are respectively sealed and rotated in the first hollow ring and the second hollow ring, the first hollow ring, one of the conversion disks and the inner wall of one side of the first heat exchange box form a second heat exchange cavity, the second hollow ring, the other conversion disk and the inner wall of the other side of the first heat exchange box form the first heat exchange cavity, the second ventilation pipe for ventilation is fixedly penetrated through the top of the second hollow ring, and the first ventilation pipe for ventilation is fixedly penetrated through the bottom of the first hollow ring, an air inlet pipe connected to the first heat exchange cavity is provided on one side of the first heat exchange box, and a The exhaust pipe connected to the second heat exchange chamber, the exhaust pipe, the first heat exchange chamber and the second heat exchange chamber cooperate to increase the time that air flows in the first heat exchange box. A driving motor located above the first pipe is fixed to one side of the first heat exchange box through a frame. The output shaft of the driving motor is fixed with a first gear. The outer wall of the first pipe is fixedly sleeved with a second gear, and the first gear is meshed with the second gear to drive the conversion disk and the spiral heat exchange tube to rotate. Air is injected into the first heat exchange chamber through the exhaust pipe, and the air is injected into the first heat exchange box through the second ventilation pipe. Then the air enters the second heat exchange chamber through the first ventilation pipe and is discharged into the activation furnace body through the exhaust pipe for recycling. During the flow of air in the first heat exchange box, heat is exchanged with the spiral heat exchange tube and the exhaust pipe. In addition, the driving motor drives the conversion disk and the spiral heat exchange tube to rotate through the cooperation of the first gear and the second gear, thereby increasing the contact area between the spiral heat exchange tube and the air and improving the efficiency of heat exchange.

[0008] In one possible design, the lifting structure includes two fixed tubes fixed to the top inner wall and the bottom inner wall of the second heat exchange box, the ends of the two fixed tubes close to each other are fixedly connected with a heat exchange plate, and the sides of the two heat exchange plates close to each other are fixedly connected with a plurality of straight heat exchange tubes, and the fixed tubes and the straight heat exchange tubes cooperate to exchange heat between the exhaust gas and the clean water in the second heat exchange box, and an exhaust pipe is fixed to one side of the fixed tube located below, and one end of the exhaust pipe is fixedly passed through one side of the second heat exchange box to discharge the exhaust gas after the heat exchange, and a plurality of stirring plates are slidably connected from top to bottom in the second heat exchange box, and the plurality of stirring plates are all located between the two heat exchange plates, and two adjacent stirring plates are fixedly connected by a plurality of connecting rods, and the plurality of stirring plates are provided with circular holes, and the straight heat exchange tubes pass through the circular holes, and the stirring plates are lifted and moved to drive the water in the second heat exchange box to move in the circular holes. The water flows in the hole, and a track groove is provided on the side of the conversion disk in the second hollow ring close to the first pipe, and a pin rod is slidably fitted in the track groove. A push rod is fixed to the end of the pin rod away from the conversion disk, and the top of the push rod passes through the second ventilation pipe, and the top of the push rod seals and slides through the first heat exchange box and the second heat exchange box. The top of the push rod is fixedly connected to the bottom of the lowest stirring plate, and the cooperation of the track groove and the pin rod drives the stirring plate to reciprocate up and down; when the conversion disk in the second hollow ring rotates, the conversion disk drives the push rod and the stirring plate to reciprocate up and down through the cooperation of the track groove and the pin rod, which is used to stir the water in the second heat exchange box, so that the water in the second heat exchange box fully contacts the straight heat exchange tube, and when the stirring plate moves, the water in the second heat exchange box flows through the circular hole, further making the water contact the straight heat exchange tube, completing the second heat exchange, and improving the efficiency of the heat exchange.

[0009] In a possible design, the cleaning structure includes a water pipe, one end of which is fixedly extended into the second heat exchange box, and the other end of the water pipe is fixedly passed through the top of the first heat exchange box and fixedly extended into the first hollow ring, so as to inject water in the second heat exchange box into the conversion disk and the spiral heat exchange tube. The inner walls of the first hollow ring and the second hollow ring are both provided with a plurality of first through holes, and the outer walls of the two conversion disks are both provided with a plurality of second through holes, and the first through holes cooperate with the second through holes to connect the conversion disk, the first hollow ring and the second hollow ring, and the same three-way pipe is fixed to the bottom of the side where the first hollow ring and the second hollow ring are close to each other, and the three-way pipe is fixed to the bottom of the side where the first hollow ring and the second hollow ring are close to each other. The bottom end of the through pipe is fixedly passed through the bottom of the first heat exchange box and extends to the bottom of the first heat exchange box, so as to discharge the moisture in the first hollow ring and the second hollow ring; the solenoid valve on the water pipe is opened, and the hot water in the second heat exchange box enters the conversion disk and the spiral heat exchange tube through the water pipe, the first through hole and the second through hole. When the water reaches a certain level, the solenoid valve on the connecting pipe is closed, and then the conversion disk and the spiral heat exchange tube are driven to rotate. The dust and impurities attached to the inner wall are flushed through the flow of water in the conversion disk and the spiral heat exchange tube, and the solenoid valve on the three-way pipe is opened to discharge the water through the three-way pipe to prevent dust from affecting the heat exchange efficiency of the conversion disk and the spiral heat exchange tube.

[0010] In a possible design, the filtering structure includes a filter cartridge, which is fixed to one end of the exhaust pipe away from the second heat exchange box, a filter cloth layer is provided on the top of the filter cartridge, a bottom cap is threadedly connected to the bottom of the filter cartridge, a placement box located in the filter cartridge is fixed on the top of the bottom cap for collecting dust and impurities falling on the filter cloth layer, a sliding rod is provided on one side of the second heat exchange box, a fixing plate is fixedly sleeved on the outer wall of the sliding rod, a tension spring is fixed between the fixing plate and the second heat exchange box, and the tension spring is sleeved on the outer wall of the sliding rod for driving the sliding rod to reset, and a push plate is fixed on the end of the sliding rod away from the second heat exchange box , and the push plate cooperates with the filter cloth layer to shake off the dust and impurities on the filter cloth layer. The end of the sliding rod away from the push plate is sealed and slidably extended into the second heat exchange box. A trapezoidal block is fixed to the bottom of the lowest stirring plate, and the trapezoidal block cooperates with the sliding rod to drive the sliding rod to move outward; when the stirring plate moves up and down, the cooperation of the trapezoidal block and the sliding rod continuously pushes the push plate to move back and forth, and the push plate can just cooperate with the filter cloth layer to shake off the impurities and dust filtered in the filter cloth layer, and collect the impurities and dust through the placement box, and the bottom cap can be threadedly disconnected from the filter cylinder to take out the placement box.

[0011] In a possible design, a connecting pipe is provided between the first heat exchange box and the second heat exchange box, one end of the connecting pipe extends into the first pipe and is rotatably connected to the first pipe, and the other end of the connecting pipe is fixedly extended into the second heat exchange box and is fixedly connected to the top fixed pipe, so as to discharge the exhaust gas after heat exchange in the first heat exchange box into the heat exchange plate and the straight heat exchange tube for secondary heat exchange.

[0012] In a possible design, two sealing rings are fixed to the inner walls of the first hollow ring and the second hollow ring. The two adjacent sealing rings are respectively located on both sides of the corresponding conversion disk, which are used to increase the sealing between the conversion disk, the first hollow ring and the second hollow ring. Solenoid valves are provided on the three-way pipe, the water pipe and the connecting pipe. A water pipe is fixed to one side of the second heat exchange box for daily hot water use.

[0013] In a possible design, the conversion disk, the first hollow ring, the second hollow ring, the spiral heat exchange tube, the heat exchange plate and the straight heat exchange tube are made of any one of copper, aluminum, silicon nitride and silicon carbide.

[0014] In one possible design, multiple magnets are fixed in multiple circular holes, multiple scraper rings are slidably fitted in multiple straight heat exchange tubes, and the scraper rings correspond to the circular holes. An iron sheet layer is fixedly embedded on the outer wall of the scraper ring. The scraper ring generates magnetic attraction with adjacent magnets through the iron sheet layer, and the magnet drives the scraper ring to move up and down through the iron sheet layer; the push rod drives the stirring plate to move up and down, and the magnet in the circular hole generates magnetic attraction with the scraper ring, and the magnet drives the scraper ring to move back and forth up and down, so as to scrape off dust and impurities attached to the inner wall to prevent dust from affecting the heat exchange efficiency of the straight heat exchange tube.

[0015] In the present application, a method for using a waste heat recovery and recycling device for activated carbon processing comprises the following steps: S1, after being filtered by the bag filter, the exhaust gas enters the first heat exchange box and the second heat exchange box through the heat exchange tube and the conversion disk for heat exchange; S2. In the first heat exchange box, air is injected through the air inlet pipe, and is circulated after heat exchange with the spiral heat exchange tube and the conversion disk; the rotation of the conversion disk and the spiral heat exchange tube is driven by a drive motor to improve the heat exchange efficiency; S3, the tail gas enters the second heat exchange box to heat the clean water to complete the second heat exchange; when the conversion disk rotates, the track groove and the pin rod drive the stirring plate to move up and down, stirring the water and making it fully contact the straight heat exchange tube, thereby improving the heat exchange efficiency; S4. The exhaust gas after the secondary heat exchange enters the filter cylinder through the exhaust pipe, and the dust and impurities are filtered by the filter cloth layer; when the stirring plate moves up and down, the trapezoidal block cooperates with the sliding rod to push the push plate to move back and forth, shaking off the impurities and dust on the filter cloth layer, and collecting them in the placement box; S5. The condensed water generated by the condensation of the exhaust gas in the first heat exchange box and the second heat exchange box is discharged to the outside through the three-way pipe and the exhaust pipe respectively; S6. When the conversion disk and the inner wall of the spiral heat exchange tube need to be cleaned, open the solenoid valve of the water pipe, and hot water enters and washes away the dust and impurities attached to the inner wall, and is discharged through the three-way pipe; S7. When the inner wall of the straight heat exchange tube needs to be cleaned, the stirring plate moves up and down to drive the magnet and the scraper ring to generate magnetic attraction to scrape off the dust and impurities attached to the inner wall.

[0016] Beneficial effect: In the present invention, one end of the water guide pipe is fixedly extended into the second heat exchange box, and the other end of the water guide pipe is fixedly extended into the first hollow circular ring, the inner walls of the first hollow circular ring and the second hollow circular ring are each provided with a plurality of first through holes, and the outer walls of the two conversion disks are each provided with a plurality of second through holes, and the same three-way pipe is fixedly provided at the bottom of the side where the first hollow circular ring and the second hollow circular ring are close to each other, and the bottom end of the three-way pipe is fixedly passed through the bottom of the first heat exchange box and extends to the bottom of the first heat exchange box; the hot water in the second heat exchange box enters the conversion disk and the spiral heat exchange tube, driving the conversion disk and the spiral heat exchange tube to rotate, and the dust and impurities attached to the inner wall are flushed by the flow of water in the conversion disk and the spiral heat exchange tube, and the solenoid valve on the three-way pipe is opened to discharge the water through the three-way pipe, so as to prevent the dust from affecting the heat exchange efficiency of the conversion disk and the spiral heat exchange tube; In the present invention, multiple magnets are fixed in the multiple circular holes, multiple scraper rings are slidably matched in the multiple straight heat exchange tubes, and the outer wall of the scraper ring is fixedly embedded with an iron sheet layer; the push rod drives the stirring plate to move up and down, and the magnets in the circular holes and the scraper rings generate magnetic attraction, and the magnets drive the scraper rings to move up and down reciprocatingly, which is used to scrape off dust and impurities attached to the inner wall to prevent dust from affecting the heat exchange efficiency of the straight heat exchange tube; In the present invention, a plurality of stirring plates are slidably connected from top to bottom in the second heat exchange box, and a plurality of stirring plates are provided with circular holes, a track groove is provided on one side of the conversion disk, a pin rod is slidably matched in the track groove, a push rod is fixed at one end of the pin rod away from the conversion disk, and the top end of the push rod is fixedly connected to the bottom of the lowest stirring plate; the conversion disk drives the push rod and the stirring plate to reciprocate up and down through the cooperation of the track groove and the pin rod, and when the stirring plate moves, the water in the second heat exchange box flows through the circular holes, further making the water contact the straight heat exchange tube, completing the second heat exchange, and improving the efficiency of the heat exchange; In the present invention, a first hollow ring and a second hollow ring are respectively fixed to inner walls on both sides of the first heat exchange box that are away from each other, and two conversion disks are respectively sealed and rotated in the first hollow ring and the second hollow ring, and the first hollow ring, the second hollow ring, the conversion disk and the inner wall of one side of the first heat exchange box respectively form a first heat exchange cavity and a second heat exchange cavity, a second ventilation pipe is fixedly penetrated through the top of the second hollow ring, and the first ventilation pipe is fixedly penetrated through the bottom of the first hollow ring; the intake pipe injects air into the first heat exchange cavity, and the air is injected into the first heat exchange box through the second ventilation pipe, and then the air enters the second heat exchange cavity through the first ventilation pipe, thereby increasing the time of air in the first heat exchange box, and the air exchanges heat with the spiral heat exchange tube and the conversion disk during the flow in the first heat exchange box. In addition, the driving motor drives the conversion disk and the spiral heat exchange tube to rotate through the cooperation of the first gear and the second gear, thereby increasing the contact area between the spiral heat exchange tube and the air and improving the efficiency of heat exchange.

[0017] In the present invention, the exhaust gas can enter the first heat exchange box and the second heat exchange box in sequence to perform two heat conversions on the exhaust gas, fully completing the utilization of the waste heat of the exhaust gas, and can easily clean the dust and impurities attached to the inner wall of the conversion disk, the first hollow ring, the sealing ring, the spiral heat exchange tube, the heat exchange plate and the straight heat exchange tube, so as to avoid the accumulation of dust and affect the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a waste heat recovery and recycling device for activated carbon processing provided in Example 1 of the present invention from a first perspective; Figure 2 A schematic diagram of the three-dimensional structure of a waste heat recovery and recycling device for activated carbon processing provided in Example 1 of the present invention from a second viewing angle; Figure 3 A schematic three-dimensional cross-sectional structure diagram of a waste heat recovery and recycling device for activated carbon processing provided in Example 1 of the present invention; Figure 4 A schematic cross-sectional view of the first heat exchange box of a waste heat recovery and recycling device for activated carbon processing provided in Example 1 of the present invention; Figure 5 for Figure 4 The enlarged structural diagram at A in the middle; Figure 6 A schematic diagram of a three-dimensional exploded structure of a first hollow ring, a conversion disk, a spiral heat exchange tube and a second hollow ring of a waste heat recovery and recycling device for activated carbon processing provided in Example 1 of the present invention; Figure 7 A schematic diagram of a three-dimensional exploded structure of a conversion disk, a pin rod and a push rod of a waste heat recovery and recycling device for activated carbon processing provided in Example 1 of the present invention; Figure 8 A schematic diagram of a three-dimensional exploded structure of a heat exchange plate, a stirring plate and a straight heat exchange tube of a waste heat recovery and recycling device for activated carbon processing provided in Example 1 of the present invention; Fig. 9 A schematic diagram of a three-dimensional explosion structure of a stirring plate and a filter cartridge of a waste heat recovery and recycling device for activated carbon processing provided in Example 1 of the present invention; Fig.10 A schematic diagram of a three-dimensional exploded structure of a filter cartridge, an exhaust pipe and a placement box of a waste heat recovery and recycling device for activated carbon processing provided in Example 1 of the present invention; Fig.11 This is a schematic cross-sectional structure diagram of a heat exchange plate, a stirring plate and a straight heat exchange tube of a waste heat recovery and recycling device for activated carbon processing provided in Example 2 of the present invention.

[0019] In the figure: 1, first heat exchange box; 2, first pipeline; 3, second pipeline; 4, bag filter; 5, connecting pipe; 6, conversion plate; 7, first hollow ring; 8, second hollow ring; 9, sealing ring; 10, spiral heat exchange tube; 11, first through hole; 12, second through hole; 13, air inlet pipe; 14, first heat exchange cavity; 15, second heat exchange cavity; 16, air outlet pipe; 17, scraper ring; 18, second ventilation pipe; 19, first ventilation pipe; 20, drive motor; 21, first gear; 22, second gear wheel; 23, track groove; 24, push rod; 25, pin rod; 26, second heat exchange box; 27, fixed pipe; 28, heat exchange plate; 29, straight heat exchange tube; 30, connecting pipe; 31, stirring plate; 32, connecting rod; 33, round hole; 34, water guide pipe; 35, three-way pipe; 36, water pipe; 37, exhaust pipe; 38, filter cartridge; 39, bottom cap; 40, placement box; 41, sliding rod; 42, fixed plate; 43, tension spring; 44, push plate; 45, trapezoidal block; 46, magnet; 47, filter cloth layer. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Example 1: Reference Figure 1-Figure 4 The waste heat recovery and recycling device is used in the field of activated carbon processing. The device mainly includes a first heat exchange box 1, and a bag dust collector 4 is provided on one side of the first heat exchange box 1. The function of the bag dust collector 4 is to preliminarily filter the exhaust gas entering the first heat exchange box 1 from the activated carbon activation furnace through the connecting pipe 5 to remove large particles of dust and impurities in the exhaust gas.

[0022] Reference Figure 1-Figure 4 A second heat exchange box 26 is fixed on the top of the first heat exchange box 1 for further heat exchange of the exhaust gas. In order to achieve heat exchange, the device is provided with two conversion disks 6 in the first heat exchange box 1, and a plurality of spiral heat exchange tubes 10 are fixed on the side of the two conversion disks 6 close to each other. The coordinated design of the spiral heat exchange tubes 10 and the conversion disks 6 can increase the contact area between the exhaust gas and the heat exchange medium, thereby improving the heat exchange efficiency.

[0023] Reference Figure 3-Figure 6 In order to realize the rotation of the conversion disk 6 and the spiral heat exchange tube 10, a rotating structure is designed in this device. The rotating structure includes a first pipe 2 and a second pipe 3, one end of which is fixedly extended into the first heat exchange box 1 and is fixedly connected to the two conversion disks 6 respectively. The other end of the second pipe 3 is rotatably connected to the air outlet of the bag filter 4. The first hollow ring 7 and the second hollow ring 8 are fixed to the inner walls on both sides of the first heat exchange box 1, and the two conversion disks 6 are sealed and rotated in the first hollow ring 7 and the second hollow ring 8 respectively. The first hollow ring 7, one of the conversion disks 6 and the inner wall of one side of the first heat exchange box 1 form a second heat exchange cavity 15, and the second hollow ring 8, the other conversion disk 6 and the inner wall of the other side of the first heat exchange box 1 form a first heat exchange cavity 14. The top of the second hollow ring 8 is fixedly penetrated by a second ventilation pipe 18, and the bottom of the first hollow ring 7 is fixedly penetrated by a first ventilation pipe 19. One side of the first heat exchange box 1 is provided with an air inlet pipe 13 connected to the first heat exchange chamber 14, and the other side is fixed with an air outlet pipe 16 connected to the second heat exchange chamber 15. Such a design can increase the time for air to flow in the first heat exchange box 1, thereby improving the heat exchange effect.

[0024] Reference Figure 4 and Figure 6On one side of the first heat exchange box 1, a driving motor 20 is fixed through a frame, and a first gear 21 is fixed to its output shaft. A second gear 22 is fixedly sleeved on the outer wall of the first pipe 2, and the first gear 21 meshes with the second gear 22. When the driving motor 20 is started, the first gear 21 and the second gear 22 cooperate to drive the conversion disk 6 and the spiral heat exchange tube 10 to rotate, thereby further increasing the contact area between the exhaust gas and the spiral heat exchange tube 10 and the conversion disk 6, and improving the heat exchange efficiency.

[0025] Reference Figure 3 , Figure 4 and Figure 5 In the second heat exchange box 26, a plurality of straight heat exchange tubes 29 are arranged for the second heat exchange. In order to increase the contact area between the straight heat exchange tubes 29 and the water in the second heat exchange box 26, a lifting structure is designed in the device. The lifting structure includes two fixed tubes 27 fixed to the top inner wall and the bottom inner wall of the second heat exchange box 26, and the ends of the two fixed tubes 27 close to each other are fixedly connected with heat exchange plates 28, and a plurality of straight heat exchange tubes 29 are fixedly connected between the heat exchange plates 28. A plurality of stirring plates 31 are slidably connected from top to bottom in the second heat exchange box 26, and two adjacent stirring plates 31 are fixedly connected by a plurality of connecting rods 32. A circular hole 33 is provided in each stirring plate 31, and the straight heat exchange tubes 29 pass through the circular hole 33. An exhaust pipe 37 is fixed to one side of the fixed tube 27 located below, which is used to discharge the exhaust gas after the heat exchange.

[0026] Reference Figure 7 and Figure 8 In order to realize the lifting and lowering movement of the stirring plate 31, a track groove 23 is provided on the side of the conversion disk 6 in the second hollow ring 8 close to the first pipe 2, and a pin rod 25 is slidably fitted in the track groove 23. A push rod 24 is fixed to the end of the pin rod 25 away from the conversion disk 6, and the top of the push rod 24 penetrates the second ventilation pipe 18, the first heat exchange box 1 and the second heat exchange box 26, and is fixedly connected to the bottom of the stirring plate 31 at the bottom. When the conversion disk 6 rotates, the push rod 24 and the stirring plate 31 can be driven to move up and down through the cooperation of the track groove 23 and the pin rod 25, thereby stirring the water in the second heat exchange box 26, so that the water fully contacts the straight heat exchange tube 29, and improves the heat exchange efficiency.

[0027] Reference Figure 1-Figure 5In addition, the device is also designed with a cleaning structure and a filtering structure. The cleaning structure is arranged between the first heat exchange box 1 and the second heat exchange box 26, and is used to remove dust and impurities attached to the inner wall of the spiral heat exchange tube 10 and the conversion disk 6. The cleaning structure mainly includes a water guide pipe 34, one end of which is firmly connected to the inside of the second heat exchange box 26. The other end of the water guide pipe 34 passes through the top of the first heat exchange box 1 and extends all the way to the first hollow ring 7. This design allows the hot water in the second heat exchange box 26 to be injected into the conversion disk 6 and the spiral heat exchange tube 10. In order to achieve this, the inner walls of the first hollow ring 7 and the second hollow ring 8 are provided with a plurality of first through holes 11, and at the same time, the outer walls of the two conversion disks 6 are also provided with a plurality of second through holes 12. These first through holes 11 and second through holes 12 are matched with each other, and they ensure the connectivity between the conversion disk 6, the first hollow ring 7 and the second hollow ring 8. In addition, the first hollow ring 7 and the second hollow ring 8 are connected to a three-way pipe 35 at the bottom of the side close to each other. The bottom of the three-way pipe 35 passes through the bottom of the first heat exchange box 1 and extends to the bottom thereof to discharge the internal moisture.

[0028] In actual operation, we first open the solenoid valve on the water pipe 34, so that the hot water in the second heat exchange box 26 can flow into the conversion disk 6 and the spiral heat exchange tube 10 through the water pipe 34, the first through hole 11 and the second through hole 12. When the water reaches a certain amount, we close the solenoid valve on the connecting pipe 30, and then start the driving device to make the conversion disk 6 and the spiral heat exchange tube 10 start to rotate. As the water flows, they will wash away the dust and impurities on the inner wall. At this time, we open the solenoid valve on the three-way pipe 35, and the washed dust and impurities can be discharged through the three-way pipe 35, thereby avoiding their influence on the heat exchange efficiency of the conversion disk 6 and the spiral heat exchange tube 10.

[0029] Reference Figure 2 , Figure 8 , Fig. 9 and Fig.10Next, we will focus on the filtering structure of the device. The filtering structure is arranged on one side of the second heat exchange box 26, and is used to filter the dust in the exhaust gas after heat exchange again to ensure that the exhaust gas meets environmental protection requirements. The structure mainly includes a filter cartridge 38, which is fixed to the end of the exhaust pipe 37 away from the second heat exchange box 26. A filter cloth layer 47 is arranged on the top of the filter cartridge 38, which is used to filter dust and impurities in the exhaust gas. The bottom of the filter cartridge 38 is connected to a bottom cap 39 by threading, and a placement box 40 is fixed on the top of the bottom cap 39 to collect dust and impurities falling from the filter cloth layer 47. In addition, a sliding rod 41 is also arranged on one side of the second heat exchange box 26, and a fixed plate 42 is fixedly sleeved on the outer wall of the sliding rod 41, and the fixed plate 42 is connected to the second heat exchange box 26 by a tension spring 43, and the tension spring 43 is also sleeved on the outer wall of the sliding rod 41 to drive the sliding rod 41 to reset. A push plate 44 is fixed to one end of the sliding rod 41 away from the second heat exchange box 26, and the push plate 44 can cooperate with the filter cloth layer 47 to shake off the dust and impurities on the filter cloth layer 47. The other end of the sliding rod 41 extends into the second heat exchange box 26 in a sealed sliding manner and cooperates with the trapezoidal block 45 fixed at the bottom of the stirring plate 31 located at the bottom.

[0030] In actual operation, when the stirring plate 31 moves up and down, the trapezoidal block 45 cooperates with the sliding rod 41 to continuously push the push plate 44 to move back and forth. In this way, the push plate 44 can cooperate with the filter cloth layer 47 to shake off the dust and impurities filtered on the filter cloth layer 47 and collect them through the placement box 40. When it is necessary to clean these dust and impurities, we can release the threaded connection between the bottom cap 39 and the filter cylinder 38 and take out the placement box 40 for cleaning.

[0031] Reference Figure 1-Figure 4 Finally, let's look at the heat exchange part of the device. The first heat exchange box 1 and the second heat exchange box 26 are connected by a connecting pipe 30. One end of the connecting pipe 30 extends into the first pipe 2 and is rotatably connected to the first pipe 2; the other end is fixedly extended into the second heat exchange box 26 and is fixedly connected to the top fixed pipe 27. In this way, the exhaust gas after heat exchange in the first heat exchange box 1 can be discharged into the heat exchange plate 28 and the straight heat exchange tube 29 for secondary heat exchange, thereby further improving the heat energy recovery efficiency.

[0032] Reference Figure 4 and Figure 5, we first focus on increasing the sealing between the conversion disk 6, the first hollow ring 7 and the second hollow ring 8. Specifically, we fixedly installed two sealing rings 9 on the inner walls of the first hollow ring 7 and the second hollow ring 8. The positions of the two sealing rings 9 are carefully designed to ensure that the two adjacent sealing rings 9 are located on both sides of the corresponding conversion disk 6. In this way, when the conversion disk 6 rotates between the first hollow ring 7 and the second hollow ring 8, the sealing ring 9 can effectively prevent heat leakage, thereby improving the sealing and thermal efficiency of the entire device.

[0033] In general, this waste heat recovery and recycling device for activated carbon processing achieves efficient and stable waste heat recovery and hot water supply functions through innovative designs such as adding a sealing ring 9, installing a solenoid valve, selecting high thermal conductivity materials, and designing a scraper ring cleaning mechanism, and has high practical value.

[0034] Reference Figure 1 and Figure 2 In order to more flexibly control the flow direction of hot water, we installed solenoid valves on the outer walls of the three-way pipe 35, the water pipe 34 and the connecting pipe 30. These solenoid valves can be opened or closed according to actual needs to adjust the flow path of hot water. In addition, we also fixedly installed a water pipe 36 on one side of the second heat exchange box 26, so that in daily use, we can conveniently use the recovered waste heat to heat water to meet the demand for domestic hot water.

[0035] In terms of material selection, we use high thermal conductivity and corrosion-resistant materials to manufacture the conversion disk 6, the first hollow ring 7, the second hollow ring 8, the spiral heat exchange tube 10, the heat exchange plate 28 and the straight heat exchange tube 29. Specifically, the material of these components can be any one of copper, aluminum, silicon nitride or silicon carbide. These materials not only have excellent thermal conductivity, but also are corrosion-resistant, which can ensure the stability and reliability of the device during long-term operation.

[0036] Through the above implementation method, we can effectively realize the waste heat recovery and recycling in the activated carbon processing process, while ensuring the cleaning and filtering effect of the equipment, improving the overall performance and operating efficiency of the equipment, further improving the heat exchange efficiency, and reducing environmental pollution.

[0037] Example 2: Reference Fig.11 , improved on the basis of Example 1: In order to further improve the heat exchange efficiency, we also installed multiple magnets 46 in multiple circular holes 33. At the same time, in multiple straight heat exchange tubes 29, we designed sliding-fitting scraper rings 17. The positions of these scraper rings 17 correspond to the circular holes 33, and the outer wall of the scraper ring 17 is fixedly embedded with an iron sheet layer. In this way, the scraper ring 17 can generate magnetic attraction with the adjacent magnet 46 through the iron sheet layer. When the magnet 46 moves, it can drive the scraper ring 17 to move up and down through the iron sheet layer.

[0038] In actual operation, when the push rod 24 drives the stirring plate 31 to move up and down, the magnet 46 in the circular hole 33 will also move accordingly. In this way, the magnet 46 will generate magnetic attraction with the scraper ring 17, driving the scraper ring 17 to move up and down. This design can effectively scrape off the dust and impurities attached to the inner wall of the straight heat exchange tube 29, and prevent the dust from affecting the heat exchange efficiency of the straight heat exchange tube 29. In this way, we can not only improve the quality of hot water, but also extend the service life of the device and reduce maintenance costs.

[0039] A method for using a waste heat recovery and recycling device for activated carbon processing, comprising the following steps: S1, the tail gas discharged from the outlet of the activated carbon activation furnace body is discharged into one of the conversion disks 6 through the connecting pipe 5 and the bag dust collector 4. The bag dust collector 4 filters the dust and impurities in the tail gas. Then the tail gas passes through the spiral heat exchange tube 10, another conversion disk 6 and the connecting pipe 30 and enters the straight heat exchange tube 29. The tail gas first undergoes heat exchange in the first heat exchange box 1, and then enters the second heat exchange box 26 for the second heat exchange; S2. When heat exchange is performed in the first heat exchange box 1, air is injected into the first heat exchange cavity 14 through the air inlet pipe 13, and the air is injected into the first heat exchange box 1 through the second ventilation pipe 18. Then, the air enters the second heat exchange cavity 15 through the first ventilation pipe 19, and is discharged into the activation furnace body through the air outlet pipe 16 for recycling. During the flow of air in the first heat exchange box 1, heat exchange is performed with the spiral heat exchange tube 10 and the conversion disk 6. In addition, the driving motor 20 drives the conversion disk 6 and the spiral heat exchange tube 10 to rotate through the cooperation of the first gear 21 and the second gear 22, thereby increasing the contact area between the spiral heat exchange tube 10 and the air and improving the efficiency of heat exchange. S3, after the exhaust gas in the first heat exchange box 1 completes the first heat exchange, it enters the second heat exchange box 26, and heats the clean water in the second heat exchange box 26 to complete the second heat exchange. When the conversion disk 6 in the second hollow ring 8 rotates, the conversion disk 6 drives the push rod 24 and the stirring plate 31 to move up and down through the cooperation of the track groove 23 and the pin rod 25, so as to stir the water in the second heat exchange box 26, so that the water in the second heat exchange box 26 fully contacts the straight heat exchange tube 29, and when the stirring plate 31 moves, the water in the second heat exchange box 26 flows through the circular hole 33, so that the water further contacts the straight heat exchange tube 29, and the second heat exchange is completed, thereby improving the efficiency of the heat exchange. S4. The tail gas after the secondary heat exchange is discharged into the filter cartridge 38 through the exhaust pipe 37. The tail gas moves upward and pushes the filter cloth layer 47 to float. The filter cloth layer 47 filters the dust and impurities in the tail gas again. In addition, when the stirring plate 31 moves up and down, the cooperation of the trapezoidal block 45 and the sliding rod 41 continuously pushes the push plate 44 to move back and forth. The push plate 44 can just cooperate with the filter cloth layer 47 to shake off the impurities and dust filtered in the filter cloth layer 47. The impurities and dust are collected by the placement box 40, and the bottom cap 39 can be released from the threaded connection with the filter cartridge 38, and the placement box 40 is taken out; S5. When the exhaust gas enters the first heat exchange box 1 for heat exchange, the exhaust gas condenses to generate condensed water, which enters the first hollow ring 7 and the second hollow ring 8 through the cooperation of the first through hole 11 and the second through hole 12, and is discharged to the outside through the three-way pipe 35. When the exhaust gas generates condensed water in the second heat exchange box 26, the condensed water moves downward under the action of gravity, and is discharged to the outside through the exhaust pipe 37 to be collected by the placement box 40; S6. When it is necessary to clean the dust and impurities attached to the inside of the conversion disk 6 and the spiral heat exchange tube 10, the solenoid valve on the water pipe 34 is opened, and the hot water in the second heat exchange box 26 enters the conversion disk 6 and the spiral heat exchange tube 10 through the water pipe 34, the first through hole 11, and the second through hole 12. When the water reaches a certain level, the solenoid valve on the connecting pipe 30 is closed, and then the conversion disk 6 and the spiral heat exchange tube 10 are driven to rotate. The dust and impurities attached to the inner wall are flushed by the flow of water in the conversion disk 6 and the spiral heat exchange tube 10, and the solenoid valve on the three-way pipe 35 is opened to discharge through the three-way pipe 35 to prevent dust from affecting the heat exchange efficiency of the conversion disk 6 and the spiral heat exchange tube 10; S7. When it is necessary to clean the dust and impurities attached to the inner wall of the straight heat exchange tube 29, the push rod 24 drives the stirring plate 31 to move up and down, and the magnet 46 in the circular hole 33 generates a magnetic attraction with the scraper ring 17. The magnet 46 drives the scraper ring 17 to move back and forth up and down to scrape off the dust and impurities attached to the inner wall to prevent the dust from affecting the heat exchange efficiency of the straight heat exchange tube 29.

[0040] However, as is well known to those skilled in the art, the working principles and wiring methods of the bag filter 4 and the drive motor 20 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any optional selections according to their needs or convenience.

[0041] 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 waste heat recovery and recycling device for activated carbon processing, characterized in that: It comprises a first heat exchange box (1), a bag filter (4) is provided on one side of the first heat exchange box (1) for filtering the exhaust gas entering the first heat exchange box (1), a connecting pipe (5) is fixed on the side of the bag filter (4) away from the first heat exchange box (1) for connecting with an activated carbon activation furnace, and a second heat exchange box (26) is fixed on the top of the first heat exchange box (1) for performing heat exchange on the exhaust gas; It also comprises two conversion disks (6), both of which are arranged in the first heat exchange box (1), a plurality of spiral heat exchange tubes (10) are fixed on one side of the two conversion disks (6) close to each other, and the conversion disks (6) cooperate with the spiral heat exchange tubes (10) to perform a first heat exchange; It also includes a plurality of straight heat exchange tubes (29), which are all located in the second heat exchange box (26) and are used for performing a second heat exchange; A rotating structure, disposed in the first heat exchange box (1), used to drive the conversion disk (6) and the spiral heat exchange tube (10) to rotate to perform a first heat exchange; A lifting structure, disposed in the second heat exchange box (26), used for stirring the water in the second heat exchange box (26) to perform a second heat exchange; A cleaning structure, arranged between the first heat exchange box (1) and the second heat exchange box (26), for removing dust and impurities attached to the inner wall of the spiral heat exchange tube (10) and the conversion disk (6); The filtering structure is arranged on one side of the second heat exchange box (26) and is used to filter dust in the exhaust gas after heat exchange again.

2. The waste heat recovery and recycling device for activated carbon processing according to claim 1 is characterized in that: The rotating structure comprises a first pipe (2) and a second pipe (3); the ends of the first pipe (2) and the second pipe (3) close to each other are fixedly extended into the first heat exchange box (1) and are respectively fixedly connected to the two conversion disks (6); the end of the second pipe (3) away from the conversion disk (6) is rotatably connected to the air outlet of the bag filter (4); the inner walls of the first heat exchange box (1) away from each other are respectively fixed with a first hollow ring (7) and a second hollow ring (8); the two conversion disks (6) are respectively sealed and rotated in the first hollow ring (7) and the second hollow ring (8); the first hollow ring (7), one of the conversion disks (6) and the inner wall of one side of the first heat exchange box (1) form a second heat exchange cavity (15); the second hollow ring (8), the other conversion disk (6) and the inner wall of the other side of the first heat exchange box (1) form a first heat exchange cavity (14); the top of the second hollow ring (8) is fixedly penetrated by a A second ventilation pipe (18) for ventilation, a first ventilation pipe (19) for ventilation is fixedly passed through the bottom of the first hollow circular ring (7), an air inlet pipe (13) connected to the first heat exchange chamber (14) is provided on one side of the first heat exchange box (1), and an air outlet pipe (16) connected to the second heat exchange chamber (15) is fixed on the other side of the first heat exchange box (1), the air inlet pipe (13), the first heat exchange chamber (14) and the second heat exchange chamber (15) cooperate to increase the time for air to flow in the first heat exchange box (1), a drive motor (20) located above the first pipe (2) is fixed on one side of the first heat exchange box (1) through a frame, the output shaft of the drive motor (20) is fixed with a first gear (21), the outer wall of the first pipe (2) is fixedly sleeved with a second gear (22), and the first gear (21) is meshed with the second gear (22) to drive the conversion disk (6) and the spiral heat exchange tube (10) to rotate.

3. The waste heat recovery and recycling device for activated carbon processing according to claim 2 is characterized in that: The lifting structure comprises two fixed tubes (27) fixed to the top inner wall and the bottom inner wall of the second heat exchange box (26); the ends of the two fixed tubes (27) close to each other are fixedly connected to a heat exchange plate (28); the sides of the two heat exchange plates (28) close to each other are fixedly connected to a plurality of straight heat exchange tubes (29); the fixed tubes (27) and the straight heat exchange tubes (29) cooperate to enable the exhaust gas to exchange heat with the clean water in the second heat exchange box (26); an exhaust pipe (37) is fixed to one side of the fixed tube (27) located at the bottom; one end of the exhaust pipe (37) is fixedly passed through one side of the second heat exchange box (26) for discharging the exhaust gas after the heat exchange; a plurality of stirring plates (31) are slidably connected from top to bottom in the second heat exchange box (26); the plurality of stirring plates (31) are located between the two heat exchange plates (28); and a plurality of connecting rods ( The heat exchanger (32) is fixedly connected, a plurality of the stirring plates (31) are each provided with a circular hole (33), and the straight heat exchange tube (29) passes through the circular hole (33). The stirring plates (31) are lifted and moved to drive the water in the second heat exchange box (26) to flow in the circular hole (33). A track groove (23) is provided on the side of the conversion disk (6) located in the second hollow circular ring (8) close to the first pipe (2). A pin rod (25) is slidably fitted in the track groove (23). A push rod (24) is fixed to the end of the pin rod (25) away from the conversion disk (6). The top end of the push rod (24) passes through the second ventilation tube (18). The top end of the push rod (24) seals and slides through the first heat exchange box (1) and the second heat exchange box (26). The top end of the push rod (24) is fixedly connected to the bottom of the lowest stirring plate (31). The cooperation between the track groove (23) and the pin rod (25) drives the stirring plate (31) to reciprocate up and down.

4. The waste heat recovery and recycling device for activated carbon processing according to claim 3 is characterized in that: The cleaning structure comprises a water pipe (34), one end of which is fixedly extended into the second heat exchange box (26), and the other end of which is fixedly passed through the top of the first heat exchange box (1) and fixedly extended into the first hollow ring (7), so as to inject water in the second heat exchange box (26) into the conversion disk (6) and the spiral heat exchange tube (10), wherein the inner walls of the first hollow ring (7) and the second hollow ring (8) are each provided with a plurality of first through holes (11), and the outer walls of the two conversion disks (6) are each provided with a plurality of The second through hole (12) is matched with the first through hole (11) and is used to connect the conversion disk (6), the first hollow circular ring (7) and the second hollow circular ring (8); a same three-way pipe (35) is fixed to the bottom of the side where the first hollow circular ring (7) and the second hollow circular ring (8) are close to each other; the bottom end of the three-way pipe (35) is fixedly passed through the bottom of the first heat exchange box (1) and extends to the bottom of the first heat exchange box (1) and is used to discharge the moisture in the first hollow circular ring (7) and the second hollow circular ring (8).

5. The waste heat recovery and recycling device for activated carbon processing according to claim 4 is characterized in that: The filtering structure comprises a filter cartridge (38), the filter cartridge (38) being fixed to one end of the exhaust pipe (37) away from the second heat exchange box (26), a filter cloth layer (47) being provided on the top of the filter cartridge (38), a bottom cap (39) being threadedly connected to the bottom of the filter cartridge (38), a placement box (40) being fixed on the top of the bottom cap (39) and being located inside the filter cartridge (38) and being used for collecting dust and impurities falling from the filter cloth layer (47), a sliding rod (41) being provided on one side of the second heat exchange box (26), a fixing plate (42) being provided on the outer wall of the sliding rod (41), and a connection between the fixing plate (42) and the second heat exchange box (26) A tension spring (43) is fixed between the two ends of the sliding rod (41), and the tension spring (43) is sleeved on the outer wall of the sliding rod (41) and is used to drive the sliding rod (41) to reset. A push plate (44) is fixed to the end of the sliding rod (41) away from the second heat exchange box (26), and the push plate (44) cooperates with the filter cloth layer (47) to shake off dust and impurities on the filter cloth layer (47). The end of the sliding rod (41) away from the push plate (44) is sealed and slidably extended into the second heat exchange box (26). A trapezoidal block (45) is fixed to the bottom of the stirring plate (31) located at the bottom, and the trapezoidal block (45) cooperates with the sliding rod (41) to drive the sliding rod (41) to move outward.

6. The waste heat recovery and recycling device for activated carbon processing according to claim 5 is characterized in that: A connecting pipe (30) is provided between the first heat exchange box (1) and the second heat exchange box (26); one end of the connecting pipe (30) extends into the first pipe (2) and is rotatably connected to the first pipe (2); the other end of the connecting pipe (30) is fixedly extended into the second heat exchange box (26) and is fixedly connected to the uppermost fixed pipe (27), so as to discharge the exhaust gas after heat exchange in the first heat exchange box (1) into the heat exchange plate (28) and the straight heat exchange pipe (29) for secondary heat exchange.

7. The waste heat recovery and recycling device for activated carbon processing according to claim 6 is characterized in that: Two sealing rings (9) are fixed to the inner walls of the first hollow circular ring (7) and the second hollow circular ring (8), and the two adjacent sealing rings (9) are respectively located on both sides of the corresponding conversion disk (6) to increase the sealing performance between the conversion disk (6), the first hollow circular ring (7) and the second hollow circular ring (8). Solenoid valves are provided on the three-way pipe (35), the water conduit (34) and the connecting pipe (30). A water pipe (36) is fixed to one side of the second heat exchange box (26) for daily use of hot water.

8. The waste heat recovery and recycling device for activated carbon processing according to claim 7 is characterized in that: The material of the conversion disk (6), the first hollow circular ring (7), the second hollow circular ring (8), the spiral heat exchange tube (10), the heat exchange plate (28) and the straight heat exchange tube (29) is any one of copper, aluminum, silicon nitride and silicon carbide.

9. The waste heat recovery and recycling device for activated carbon processing according to claim 8, characterized in that: A plurality of magnets (46) are fixed in each of the plurality of circular holes (33), a plurality of scraper rings (17) are slidably fitted in each of the plurality of straight heat exchange tubes (29), and the scraper rings (17) correspond to the circular holes (33). An iron sheet layer is fixedly embedded in the outer wall of the scraper ring (17), and the scraper ring (17) generates magnetic attraction with adjacent magnets (46) through the iron sheet layer, and the magnets (46) drive the scraper ring (17) to move up and down through the iron sheet layer.

10. The method for using the waste heat recovery and recycling device for activated carbon processing according to claim 9, characterized in that: The following steps are involved: S1, after being filtered by the bag filter (4), the exhaust gas enters the first heat exchange box (1) and the second heat exchange box (26) through the heat exchange tube and the conversion disk (6) for heat exchange; S2. In the first heat exchange box (1), air is injected through the air inlet pipe (13), and is circulated after heat exchange with the spiral heat exchange tube (10) and the conversion disk (6); the conversion disk (6) and the spiral heat exchange tube (10) are driven by a drive motor (20) to improve heat exchange efficiency; S3, the exhaust gas enters the second heat exchange box (26), heats the clean water to complete the second heat exchange; when the conversion disk (6) rotates, the track groove (23) and the pin rod (25) drive the stirring plate (31) to move up and down, stirring the water and making it fully contact the straight heat exchange tube (29), thereby improving the heat exchange efficiency; S4, the exhaust gas after the secondary heat exchange enters the filter cartridge (38) through the exhaust pipe (37), and the dust and impurities are filtered by the filter cloth layer (47); when the stirring plate (31) moves up and down, the trapezoidal block (45) cooperates with the sliding rod (41) to push the push plate (44) to move back and forth, and the impurities and dust on the filter cloth layer (47) are shaken off and collected by the placement box (40); S5, the condensed water generated by the condensation of the exhaust gas in the first heat exchange box (1) and the second heat exchange box (26) is discharged to the outside through the three-way pipe (35) and the exhaust pipe (37) respectively; S6. When the conversion disk (6) and the inner wall of the spiral heat exchange tube (10) need to be cleaned, the solenoid valve of the water guide pipe (34) is opened, hot water enters and washes away the dust and impurities attached to the inner wall, and is discharged through the three-way pipe (35); S7. When the inner wall of the straight heat exchange tube (29) needs to be cleaned, the stirring plate (31) moves up and down to drive the magnet (46) and the scraper ring (17) to generate magnetic attraction to scrape off dust and impurities attached to the inner wall.

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