Chemical heat recovery device and method for plate heat exchanger

Abstract

The device comprises a connecting box body, a heat exchange plate spacing adjustable structure and a swing flushing structure are arranged in the box body, the end face of the box body is connected with a water pump, the side wall of the box body is connected with a controller, a water outlet pipe is arranged at the bottom of the box body, and the water pump and two motors are electrically connected with the controller. The heat exchange plate spacing adjustable structure drives a lead screw, a sliding block, a pull rod and the like to perform transmission through a driving motor, so that the movable heat exchange plates are clamped or uniformly separated; the swing flushing structure drives a gear to transmit through a rotating motor, so that a cleaning nozzle swings back and forth between heat exchange plates and cooperates with a water pump to spray water for flushing. The method comprises the steps that the driving motor is controlled to separate the heat exchange plates, the rotating motor is started to drive the nozzles to swing, the water pump is started to wash the plugs, and finally the driving motor clamps the heat exchange plates for sealing. Spacing adjustment and automatic cleaning are achieved without disassembly, the problems that an existing device is tedious in operation and wastes time and labor are solved, the heat exchange efficiency and use convenience are improved, waste heat is effectively recycled, and energy waste is reduced.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and in particular to a plate heat exchanger chemical heat recovery device and method. Background Technology

[0002] In the metallurgical and chemical industries, the special and complex processes often generate large amounts of high-temperature, dust-laden flue gas. This flue gas is not only hot but also contains a large amount of particulate matter. If it is directly released into the atmosphere without effective treatment, it will not only cause enormous energy waste but also severely pollute the environment. Therefore, how to efficiently and environmentally recover and utilize this heat has become a crucial issue that urgently needs to be addressed in the current industrial sector.

[0003] Traditionally, boilers or other types of heat exchangers are used for heat recovery from high-temperature, dusty flue gas. However, under special process conditions, such as extremely high flue gas temperatures and high dust content, conventional heat exchangers often fall short. Specifically, after prolonged operation, the sealing performance between the heat exchange plates in existing plate heat exchangers gradually declines, leading to reduced heat exchange efficiency. For example, the plate heat exchanger flushing device disclosed in CN202692827U, when using seawater as the coolant, suffers from severe scaling between the thin plates due to poor water quality, high hardness, and abundant biological sludge, resulting in reduced heat exchange rate, deterioration of unit vacuum, and impact on the safe and stable operation of the unit. Furthermore, to address the issue of decreased heat exchange plate sealing, manual disassembly of the heat exchanger is usually required to improve the sealing performance by tightening bolts, but this process is time-consuming, labor-intensive, and disrupts the normal operation of the production line.

[0004] Furthermore, with prolonged use, a large amount of dirt accumulates on the surface of the heat exchange plates, further hindering heat transfer and reducing heat exchange efficiency. Currently, the common method for cleaning heat exchange plates is manual disassembly followed by rinsing with a water gun. This method also suffers from low efficiency and high labor intensity. Especially in harsh working environments with high temperatures and dust, the safety and feasibility of manual operation are severely challenged. Although some patented technologies have attempted to solve these problems, such as the plate heat exchanger with automatic cleaning function disclosed in CN218673281U, which aims to achieve automatic cleaning of the heat exchange plates through water pipes and deflection components, these methods still have limitations in practical applications. Specifically, although automatic cleaning devices can reduce the frequency of manual cleaning, manual assistance may still be required when dealing with severe dirt accumulation, and the maintenance and operating costs of the equipment are relatively high.

[0005] More importantly, existing plate heat exchanger-based chemical heat recovery devices often lack effective solutions to simultaneously address the problems of decreased heat exchanger plate sealing and fouling accumulation. For example, the plate heat exchanger flushing device disclosed in CN202692827U, while providing a flushing device capable of cleaning the heat exchanger without leaving the heat exchange system, may have its flushing effect limited by flushing pressure and flushing method, failing to thoroughly remove stubborn fouling. While a plate heat exchanger with automatic cleaning function disclosed in CN218673281U achieves automatic cleaning, it may not completely solve the problem of decreased heat exchanger plate sealing, especially under high temperature, high pressure, and harsh operating conditions.

[0006] Therefore, developing a high-efficiency plate heat exchanger heat recovery device for chemical industry that can automatically adjust the heat exchanger plate spacing and achieve online cleaning of the heat exchanger plates has significant practical importance and application value. This invention aims to provide a plate heat exchanger heat recovery device for chemical industry through innovative design. This device can not only automatically adjust the heat exchanger plate spacing to maintain the sealing of the heat exchanger plates, but also achieve online cleaning to thoroughly remove dirt from the surface of the heat exchanger plates, thereby solving the problems in existing technologies, improving heat recovery efficiency, and reducing operating costs. Summary of the Invention

[0007] The technical problem this invention aims to solve is to provide a plate heat exchanger-based chemical heat recovery device and method, addressing specific technical issues encountered in the heat recovery process of high-temperature dust-laden flue gas in the smelting and chemical industries. Specifically, after prolonged operation, the sealing performance between the heat exchange plates in existing plate heat exchangers significantly decreases, leading to reduced heat exchange efficiency. Furthermore, dirt easily accumulates on the surface of the heat exchange plates, further hindering heat transfer. To solve these problems, manual disassembly of the heat exchanger for cleaning and tightening is typically required, which is not only time-consuming and labor-intensive but also disrupts the normal operation of the production line. Therefore, this invention provides an innovative plate heat exchanger-based chemical heat recovery device and its usage method, aiming to overcome the limitations of existing technologies such as decreased heat exchange plate sealing performance and difficult cleaning, achieving efficient and automated heat recovery.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A plate heat exchanger chemical heat recovery device and method are provided, specifically including: (a) Plate heat exchanger chemical heat recovery device A plate heat exchanger chemical heat recovery device includes a connecting box, in which an adjustable heat exchange plate spacing structure and a corresponding swing flushing structure are installed. A water pump is connected to the end face of the connecting box, a controller is connected to the side wall, and a water outlet pipe is provided at the bottom. The water pump, drive motor, and rotary motor are all electrically connected to the controller through wires to realize the automated control of each component.

[0009] 1. Adjustable heat exchanger plate spacing The adjustable heat exchange plate spacing structure includes a fixed connecting plate, a drive motor, and movable heat exchange plates. The fixed connecting plate is installed on the side wall of the connecting box, and the drive motor is installed on the other side wall of the connecting box. The fixed connecting plate is equipped with a connecting bracket and multiple sets of connecting guide columns. Multiple sets of movable heat exchange plates are slidably mounted on the connecting guide columns. Movable connecting plates are slidably mounted on the connecting bracket and connecting guide columns at one end of the movable heat exchange plates.

[0010] The side wall of the movable heat exchange plate is rotatably connected to multiple sets of connecting rotating plates. The two ends of the connecting rotating plates are rotatably connected to the fixed connecting plate and the movable connecting plate, respectively. The drive end of the drive motor is connected to a lead screw, and a movable slider is screwed onto the lead screw. The movable slider is connected to a movable connecting block through a rotating pull rod. The movable connecting block is installed on the side wall of the movable connecting plate. Multiple sets of heat exchange tubes are installed on the fixed connecting plate. The heat exchange tubes pass through the fixed connecting plate and are connected to the movable heat exchange plate and the movable connecting plate.

[0011] Both the movable heat exchange plate and the movable connecting plate are provided with connecting holes adapted to the connecting guide posts. The connecting guide posts are slidably connected to the connecting holes to ensure that the movable heat exchange plate and the movable connecting plate move smoothly along the connecting guide posts. The movable connecting plate is provided with a sliding groove adapted to the connecting bracket. The connecting bracket is slidably connected to the sliding groove to further improve the movement stability of the movable connecting plate. Both the movable heat exchange plate and the movable connecting plate are provided with connecting holes adapted to the heat exchange tubes. The heat exchange tubes are clearance-fitted to the connecting holes to ensure that the heat exchange tubes can exchange heat normally without affecting the movement of the movable heat exchange plate.

[0012] The movable heat exchange plate and the connecting rotating plate are rotatably connected by a connecting shaft. The lead screw is integrally formed by a left-hand lead screw and a right-hand lead screw, so that when the lead screw rotates, it can drive two sets of movable sliders to move synchronously in opposite or opposite directions. The lead screw is rotatably connected to the connecting bracket through a bearing seat. The connecting bracket has a groove adapted to the movable slider, and the movable slider is slidably connected to the groove. The movable slider and the rotating pull rod, and the rotating pull rod and the movable connecting block are all rotatably connected by a rotating shaft to ensure the flexible operation of the transmission structure.

[0013] 2. Oscillating flushing structure The oscillating flushing structure includes a connecting housing and a rotating motor. The connecting housing is connected to the connecting box via a connecting plate, and a connecting bracket is installed inside it. The connecting bracket is connected to the rotating motor via a connecting seat. The drive end of the rotating motor is connected to a drive rod via a coupling. A first connecting plate is installed at the other end of the drive rod. The other end of the first connecting plate is connected to a drive lever. A second connecting plate is connected to the drive lever.

[0014] One end of the second connecting plate is connected to the first rotating shaft. A first gear is installed on the first rotating shaft. The first gear meshes with the second gear. A second rotating shaft is installed at the center of the second gear. A third gear is installed on the second rotating shaft. The third gear meshes with the fourth gear. A third rotating shaft is installed at the center of the fourth gear. One end of both the second and third rotating shafts is connected to the swing connecting pipe. The swing connecting pipe is connected to the water pump outlet through a flexible hose. Multiple sets of cleaning nozzles are installed on its side wall.

[0015] The drive rod, first shaft, second shaft, and third shaft are all rotatably connected to the connecting bracket via bearing seats. The swing connecting pipe is rotatably connected to the connecting box via bearing seats to ensure the smooth operation of each rotating component. The second connecting plate is provided with a sliding groove that matches the drive lever. The drive lever and the sliding groove are fitted with a clearance to ensure that the drive lever drives the second connecting plate to swing flexibly.

[0016] (II) Plate heat exchanger chemical heat recovery method A method for recovering chemical heat using a plate heat exchanger, comprising the following steps: Step 1: When it is necessary to clean the blockage between the moving heat exchange plates, the controller controls the drive motor to run. The drive motor drives the lead screw to rotate. Since the lead screw is a left-hand + right-hand integrated structure, the two sets of moving sliders move in opposite directions. Through the rotating pull rod and the moving connecting block, the moving connecting plate is driven to slide along the connecting guide post and the connecting bracket. Then, through the connecting rotating plate, multiple sets of moving heat exchange plates are evenly separated to provide space for cleaning. Step 2: Control the operation of the rotating motor through the controller. The rotating motor drives the drive rod, the first connecting plate, and the drive lever to rotate in sequence. The drive lever, through its cooperation with the sliding groove on the second connecting plate, drives the second connecting plate to swing around the first rotating shaft as the axis. The second connecting plate drives the first gear to swing. Through the meshing transmission of the second, third, and fourth gears, it drives the second and third rotating shafts to rotate back and forth in opposite directions, ultimately causing the cleaning nozzle on the swing connecting pipe to swing back and forth between the moving heat exchange plates. Step 3: Start the water pump through the controller. Water flows through the hose to the swing connecting pipe and is sprayed out from multiple sets of cleaning nozzles to thoroughly flush and clean the blockages and dirt between the moving heat exchange plates. The cleaned wastewater is discharged from the outlet pipe at the bottom of the connecting box. Step 4: After the blockage is cleared, the controller controls the drive motor to run in reverse. The drive motor drives the lead screw to rotate in reverse, and the two sets of moving sliders move in opposite directions. Through the transmission structure, the moving connecting plate moves in reverse, and then through the connecting rotating plate, the moving heat exchange plates move closer to each other and clamp together, completing the sealing between multiple sets of moving heat exchange plates and ensuring heat exchange efficiency.

[0017] The present invention provides a plate heat exchanger chemical heat recovery device and method, which has the following beneficial effects: 1. This invention utilizes an adjustable heat exchange plate spacing structure, employing a drive motor to rotate a lead screw, which in turn drives a moving slider and a rotating pull rod, enabling precise clamping and uniform separation of the moving heat exchange plates. This design effectively solves the problem of requiring manual disassembly and tightening of heat exchange plates in traditional devices when their sealing deteriorates, significantly improving heat exchange stability, ensuring heat recovery efficiency, reducing heat loss due to poor sealing, and increasing energy utilization.

[0018] 2. The oscillating flushing structure of this invention utilizes a rotating motor-driven gear transmission mechanism to cause the oscillating connecting pipe and cleaning nozzle to oscillate back and forth between the moving heat exchange plates, while a water pump delivers water flow for comprehensive flushing. This eliminates the need to disassemble the heat exchange plates, significantly reducing manual labor intensity and saving labor costs. It also avoids potential damage to the heat exchange plates during manual disassembly, extending their service life.

[0019] 3. This invention electrically connects the water pump, drive motor, and rotary motor to the controller, achieving automated control of spacing adjustment and cleaning operations. This reduces manual intervention, lowers operational complexity, and is highly adaptable to the high-efficiency production needs of industrial scenarios, improving production automation levels and allowing operators to focus more on other production processes, thus increasing overall production efficiency.

[0020] 4. In this invention, the rotating lead screw adopts a left-handed + right-handed integrated molding structure, which can drive two sets of moving sliders to move synchronously in opposite directions or relative to each other, ensuring that the spacing between multiple sets of moving heat exchange plates is adjusted consistently. This effectively improves the sealing effect and ensures uniform spacing during cleaning, optimizing cleaning conditions and allowing the cleaning nozzle to clean the heat exchange plates more evenly, thus improving cleaning quality.

[0021] 5. In this invention, the movable heat exchange plate and connecting guide column, as well as the movable connecting plate and connecting bracket, all adopt a sliding connection design, in conjunction with a heat exchange tube with clearance fit. This ensures heat exchange efficiency while guaranteeing smooth movement of all components, reducing mechanical wear, extending component lifespan, and minimizing equipment failures and maintenance costs caused by component wear.

[0022] 6. In the oscillating flushing structure of this invention, the drive lever and the sliding groove of the oscillating connecting plate are fitted together with a clearance, combined with multiple sets of gear meshing transmission, to achieve large-angle reciprocating oscillation of the cleaning nozzle. This can fully cover the entire surface and gaps of the moving heat exchange plate, avoiding cleaning dead corners, greatly improving the cleaning effect, ensuring that the dirt on the surface of the heat exchange plate is thoroughly removed, and restoring good heat exchange performance.

[0023] 7. The device of this invention has a compact overall structure, with the connecting box integrating heat exchange and cleaning functions. All components are securely connected by bolts, welding, and other methods. It is easy to install and has low maintenance costs, making it highly adaptable to the complex working conditions of the smelting and chemical industries. This lowers the barrier to entry for equipment use and reduces the time and cost investment for enterprises in equipment installation and maintenance.

[0024] 8. This invention specifically addresses the heat recovery needs of high-temperature, dust-laden flue gas. Through a highly efficient heat exchange structure and a self-cleaning function, it reduces heat waste and lowers the load on subsequent flue gas treatment equipment. This aligns with the industrial development trend of energy conservation and emission reduction, helping enterprises save energy and reduce emissions, lowering energy costs, and reducing thermal pollution to the environment. 9. In the adjustable heat exchange plate spacing structure of this invention, both ends of the connecting rotating plate are rotatably connected to a fixed connecting plate and a movable connecting plate, respectively, ensuring balanced force distribution on the movable heat exchange plate during movement and preventing deformation. This effectively extends the service life of the device, reduces equipment replacement frequency, lowers equipment procurement costs for enterprises, and improves their economic efficiency.

[0025] 10. In this invention, rotating components such as the drive rod and rotating shaft are rotatably connected to the connecting bracket via bearing seats, reducing rotational resistance and improving transmission stability. This reduces equipment operating noise, improves the industrial production environment, enhances employee comfort, and helps improve employee work enthusiasm and efficiency.

[0026] 11. The wastewater from the cleaning process can be centrally discharged through the outlet pipe connected to the bottom of the tank, facilitating subsequent wastewater treatment and avoiding environmental pollution caused by indiscriminate discharge of dirt. This meets environmental protection production requirements.

[0027] 12. Compared to traditional manual disassembly and cleaning methods, this invention significantly reduces equipment downtime for maintenance and improves production continuity through automated cleaning and spacing adjustment processes. This reduces downtime losses for enterprises, increases production efficiency, enhances market competitiveness, and enables enterprises to gain a competitive advantage in the fierce market competition.

[0028] 13. The adjustable heat exchanger plate spacing structure of the present invention can flexibly adjust the heat exchanger plate spacing according to factors such as flue gas temperature, flow rate, and dust content under different operating conditions. When the flue gas temperature is high and the flow rate is large, the spacing is appropriately increased to ensure air circulation between the heat exchanger plates and avoid damage to the heat exchanger plates due to excessive temperature. When the flue gas dust content is high, the spacing is reduced to enhance the sealing between the heat exchanger plates, prevent dust from entering the interior of the heat exchanger plates and affecting the heat exchange effect, and improve the adaptability of the device to different operating conditions.

[0029] 14. During the cleaning process, the oscillating flushing structure of the present invention allows the cleaning nozzle to automatically adjust the oscillation speed and water spray pressure according to the degree and distribution of dirt on the heat exchange plate. For areas with more severe dirt, the oscillation speed and water spray pressure are increased for powerful cleaning; for areas with less severe dirt, the oscillation speed and water spray pressure are reduced for gentle cleaning, improving the targeting and effectiveness of cleaning while saving water resources.

[0030] 15. This invention enables real-time monitoring and remote control of the device's operating status via a controller. Operators can access the device's operating parameters, such as heat exchanger plate spacing, cleaning progress, and equipment temperature, at any time from the control room using computers or mobile phones. They can then remotely adjust and control the device according to actual conditions, improving the convenience and intelligence of equipment management.

[0031] 16. In the design and manufacturing process of the device, this invention fully considers the corrosion resistance and wear resistance of the materials. High-quality corrosion-resistant and wear-resistant materials are selected for key components such as heat exchange plates and transmission parts, which can effectively resist the wear of corrosive substances and dust in high-temperature dusty flue gas, extend the service life of the device, and reduce equipment maintenance costs. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the isolateral structure of the present invention; Figure 2 for Figure 1 Internal structure diagram; Figure 3 This is a schematic diagram of the adjustable heat exchanger plate spacing structure of the present invention; Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure; Figure 5 This is a schematic diagram of the oscillating flushing structure of the present invention; Figure 6 for Figure 5 Partial structural diagram; Figure 7 for Figure 6 Partial structural diagram; Figure 8 This is a partial structural diagram of the oscillating flushing structure of the present invention; In the diagram: 1. Connecting housing; 2. Adjustable spacing structure; 3. Swinging flushing structure; 4. Water pump; 5. Controller; 6. Water outlet pipe; 200. Fixed connecting plate; 201. Drive motor; 202. Connecting bracket; 203. Connecting guide post; 204. Moving heat exchange plate; 205. Moving connecting plate; 206. Connecting rotating plate; 207. Lead screw; 208. Slider; 209. Pull rod; 210. Moving connecting block; 211. Heat exchange tube; 301. Connecting housing; 302. Connecting bracket; 303. Rotating motor; 304. Drive rotating rod; 305. First connecting plate; 306. Drive lever; 307. Second connecting plate; 308. First rotating shaft; 309. First gear; 310. Second rotating shaft; 311. Third gear; 312. Fourth gear; 313. Third rotating shaft; 314. Swinging connecting pipe; 315. Cleaning nozzle; 316. Detailed Implementation

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments: Example 1 like Figures 1 to 7 As shown in the figure, this embodiment provides a plate heat exchanger chemical heat recovery device, the structure of which is described in detail below with reference to the accompanying drawings: like Figure 1 As shown, the device includes a connecting box 1, a water pump 4 connected to the end face of the connecting box 1, a controller 5 connected to the side wall, and a water outlet pipe 6 installed at the bottom. The overall structure is compact, and the layout of each component is reasonable, making it easy to install and maintain.

[0034] like Figure 2 As shown, the heat exchange plate spacing adjustable structure 2 and the swing flushing structure 3 are installed inside the connecting box 1. The swing flushing structure 3 is set to correspond with the heat exchange plate spacing adjustable structure 2 to ensure that the flushing operation can accurately cover the heat exchange plate area, while reserving sufficient installation and operation space for each structure.

[0035] like Figure 3 , Figure 4As shown, the heat exchange plate spacing adjustable structure 2 includes a fixed connecting plate 200, a drive motor 201, and movable heat exchange plates 204. The fixed connecting plate 200 is installed on the side wall of the connecting housing 1, and the drive motor 201 is fixed to the other side wall of the connecting housing 1 through a connecting seat. A connecting bracket 202 and multiple sets of connecting guide columns 203 are installed on the fixed connecting plate 200. Multiple sets of movable heat exchange plates 204 are slidably assembled on the connecting guide columns 203. A movable connecting plate 205 is slidably assembled on the connecting bracket 202 and the connecting guide columns 203 and located at one end of the movable heat exchange plate 204. Multiple sets of connecting rotating plates 206 are rotatably connected to the side wall of the movable heat exchange plate 204. One end of the rightmost connecting rotating plate 206 is rotatably connected to the fixed connecting plate 200, and one end of the leftmost connecting rotating plate 206 is rotatably connected to the movable connecting plate 205. The drive end of the drive motor 201 is connected to the lead screw 207. A movable slider 208 is screwed onto the lead screw 207. A rotating pull rod 209 is rotatably connected to the movable slider 208 through a rotating shaft. The other end of the rotating pull rod 209 is rotatably connected to the movable connecting block 210. The movable connecting block 210 is installed on the side wall of the movable connecting plate 205. Multiple sets of heat exchange tubes 211 are installed on the fixed connecting plate 200. The heat exchange tubes 211 pass through the fixed connecting plate 200 and are clearance-fitted with the connecting holes on the movable heat exchange plate 204 and the movable connecting plate 205.

[0036] like Figure 3 As shown, both the movable heat exchange plate 204 and the movable connecting plate 205 have connecting holes adapted to the connecting guide post 203, and the connecting guide post 203 is slidably connected to the connecting hole; the movable connecting plate 205 has a sliding groove adapted to the connecting bracket 202, and the connecting bracket 202 is slidably connected to the sliding groove, ensuring that the movable connecting plate 205 and the movable heat exchange plate 204 move smoothly along a set trajectory. Figure 4 As shown, the lead screw 207 is integrally formed from a left-hand lead screw and a right-hand lead screw, and is rotatably connected to the connecting bracket 202 through a bearing seat. The connecting bracket 202 has a groove adapted to the movable slider 208. The movable slider 208 is slidably connected to the groove to ensure that when the lead screw 207 rotates, it drives the movable slider 208 to move synchronously in the opposite direction or relative to it.

[0037] like Figure 5 As shown, the oscillating flushing structure 3 includes a connecting housing 301 and a rotating motor 303. The connecting housing 301 is connected to the connecting box 1 through a connecting plate, and a connecting bracket 302 is installed inside it. The rotating motor 303 is fixed on the connecting bracket 302 through a connecting seat. The drive end of the rotating motor 303 is connected to the drive rod 304 through a coupling. The other end of the drive rod 304 is equipped with a first connecting plate 305. The other end of the first connecting plate 305 is connected to the drive lever 306. A second connecting plate 307 is connected to the drive lever 306. The oscillating connecting pipe 315 is rotatably connected to the connecting box 1 through a bearing seat. Multiple sets of cleaning nozzles 316 are installed on its side wall. The oscillating connecting pipe 315 is connected to the water outlet of the water pump 4 through a hose.

[0038] like Figure 6 , Figure 7 and Figure 8 As shown, one end of the second connecting plate 307 is connected to the first rotating shaft 308. A first gear 309 is mounted on the first rotating shaft 308, and the first gear 309 meshes with the second gear 310. A second rotating shaft 311 is mounted at the center of the second gear 310, and a third gear 312 is mounted on the second rotating shaft 311. The third gear 312 meshes with the fourth gear 313, and a third rotating shaft 314 is mounted at the center of the fourth gear 313. One end of both the second rotating shaft 311 and the third rotating shaft 314 is connected to the swing connecting pipe 315. The drive rod 304, the first rotating shaft 308, the second rotating shaft 311, and the third rotating shaft 314 are all rotatably connected to the connecting bracket 302 through bearing seats. A sliding groove adapted to the drive lever 306 is provided on the second connecting plate 307. The drive lever 306 and the sliding groove are fitted with a clearance to ensure that the transmission process is flexible and smooth, realizing the reciprocating swing of the cleaning nozzle 316.

[0039] The water pump 4, drive motor 201, and rotary motor 303 are all electrically connected to the controller 5 via wires, enabling centralized automated control of each component and ensuring stable operation of the device.

[0040] Example 2 In another preferred embodiment, based on Embodiment 1, this embodiment provides a method for recovering chemical heat using a plate heat exchanger. The specific implementation steps of the method for recovering heat using a plate heat exchanger chemical heat recovery device as described in Embodiment 1 are as follows: Step 1: When blockage is detected between the moving heat exchange plates 204, affecting heat exchange efficiency, the controller 5 controls the drive motor 201 to operate. For example... Figure 3 , Figure 4 As shown, the drive motor 201 drives the lead screw 207 to rotate. Since the lead screw 207 is a one-piece structure with left-hand and right-hand rotation, the two sets of movable sliders 208 move in opposite directions along the sliding grooves on the connecting bracket 202. Through the rotating pull rod 209 and the movable connecting block 210, the movable connecting plate 205 slides along the connecting guide post 203 and the connecting bracket 202. Then, through the connecting rotating plate 206, multiple sets of movable heat exchange plates 204 are evenly separated on the connecting guide post 203, providing sufficient space for subsequent cleaning operations and ensuring that the cleaning water can fully contact the blocked area.

[0041] Step 2: After the heat exchange plate 204 is separated, keep the drive motor 201 stopped and control the rotation motor 303 to run via the controller 5. For example... Figure 5 , Figure 6 As shown, the rotating motor 303 drives the drive rod 304 to rotate, the drive rod 304 drives the first connecting plate 305 to rotate, and in turn drives the drive lever 306 to rotate; as Figure 7As shown, the drive lever 306, through its engagement with the sliding groove on the second connecting plate 307, causes the second connecting plate 307 to swing about the first rotating shaft 308 as its axis. The second connecting plate 307 then causes the first gear 309 on the first rotating shaft 308 to swing. The first gear 309 meshes with the second gear 310, driving the second rotating shaft 311 to rotate. The third gear 312 on the second rotating shaft 311 meshes with the fourth gear 313, thereby driving the third rotating shaft 314 to rotate reciprocally in the opposite direction. Figure 5 As shown, the second rotating shaft 311 and the third rotating shaft 314 synchronously drive the swing connecting pipe 315 to reciprocate, so that the cleaning nozzle 316 on the swing connecting pipe 315 swings back and forth between the moving heat exchange plates 204, so as to achieve full coverage of the surface and gaps of the moving heat exchange plates 204 and avoid cleaning dead corners.

[0042] Step 3: After starting the rotating motor 303, the water pump 4 is started through the controller 5. The water flows through the hose to the swing connecting pipe 315, and then sprays out from multiple sets of cleaning nozzles 316 to perform high-pressure flushing and cleaning of the blockage dirt between the moving heat exchange plates 204. The wastewater generated during cleaning carries the dirt and is discharged from the water outlet pipe 6 at the bottom of the connecting box 1, completing the dirt removal operation.

[0043] Step 4: After the blockage is cleared, controller 5 controls drive motor 201 to run in reverse. For example... Figure 3 , Figure 4 As shown, the drive motor 201 drives the lead screw 207 to rotate in the opposite direction, and the two sets of moving sliders 208 move in opposite directions. The rotating pull rod 209 and the moving connecting block 210 drive the moving connecting plate 205 to move in the opposite direction. Then, the connecting rotating plate 206 drives the moving heat exchange plates 204 to move closer to each other and clamp together, completing the sealing between multiple sets of moving heat exchange plates 204, ensuring that the device returns to normal heat exchange state and ensuring stable heat exchange efficiency.

[0044] Example 3 In another preferred embodiment, based on Embodiment 1, this embodiment provides a plate heat exchanger chemical heat recovery device, suitable for treating high-temperature process flue gas in the chemical industry with a temperature of 400~600℃ and a dust concentration ≤50g / m³. Its specific structure is as follows: The connecting box 1 is made of 304 stainless steel and is 1200mm long, 800mm wide and 600mm high. The end face of the box is connected to the water pump 4 of model ISG50-160 through the flange. The side wall is fixed with the controller 5 of model PLCS7-200 through bolts. The bottom is welded with the DN80 water outlet pipe 6, and the water outlet pipe 6 is equipped with a shut-off valve.

[0045] In the adjustable heat exchange plate spacing structure 2, the fixed connecting plate 200 is a 20mm thick stainless steel plate, which is fixed to the inner wall of the connecting box 1 by bolts; the drive motor 201 is a Y90S-4 three-phase asynchronous motor with a power of 1.1kW, which is fixed to the other side wall of the connecting box 1 by angle iron connecting seat. Two sets of parallel connecting brackets 202 (made of Q235 steel plate, cross-sectional size 50mm×50mm) and four sets of connecting guide columns 203 (made of 45 steel, diameter 25mm, length 800mm) are welded on the fixed connecting plate 200. Ten sets of movable heat exchange plates 204 are slidably mounted on the connecting guide columns 203. The movable heat exchange plates 204 are 8mm thick stainless steel corrugated plates, and the initial plate spacing is set to 15mm.

[0046] A movable connecting plate 205 (15mm thick stainless steel plate) is slidably mounted on the connecting bracket 202 and the connecting guide post 203 and located on one side of the movable heat exchange plate 204. A connecting rotating plate 206 (6mm thick stainless steel plate) is rotatably connected to the side wall of the movable heat exchange plate 204 via a connecting shaft. One end of the rightmost connecting rotating plate 206 is connected to the fixed connecting plate 200, and one end of the leftmost connecting rotating plate 206 is connected to the movable connecting plate 205. The drive motor 201 is connected to the lead screw 207 via a flexible coupling. The lead screw 207 is a left-hand and right-hand integral molded structure, made of 40Cr steel, with a diameter of 30mm and a lead of 10mm. It is rotatably connected to the connecting bracket 202 via a deep groove ball bearing seat. Two sets of movable sliders 208 (made of HT200) are screwed onto the lead screw 207. A rotating pull rod 209 (a 16mm diameter 45# steel pull rod) is rotatably connected to the movable slider 208 via a rotating shaft. The other end of the rotating pull rod 209 is rotatably connected to the movable connecting block 210 (a stainless steel block welded to the side wall of the movable connecting plate 205) via a rotating shaft. Twenty sets of heat exchange tubes 211 (made of 316L stainless steel, with a diameter of 20mm and a wall thickness of 3mm) are welded onto the fixed connecting plate 200. The heat exchange tubes 211 pass through the fixed connecting plate 200 and are clearance-fitted with the connecting holes on the movable heat exchange plate 204 and the movable connecting plate 205, with a clearance value of 0.5mm.

[0047] In the oscillating flushing structure 3, the connecting housing 301 is a stainless steel welded component, fixed to the top of the connecting box 1 by connecting plate bolts. An internal connecting bracket 302 (made of Q235 steel plates) is welded inside. The rotating motor 303 is a Y80M1-2 three-phase asynchronous motor with a power of 0.75kW, fixed to the connecting bracket 302 by a connecting seat. The drive end of the rotating motor 303 is connected to the drive rod 304 (a 20mm diameter No. 45 steel rod) via a coupling. The other end of the drive rod 304 is welded to the first connecting plate 305 (a 12mm thick stainless steel plate). The other end of the first connecting plate 305 is connected to the drive lever 306 (a 12mm diameter steel rod) via a pin.

[0048] The second connecting plate 307 is made of 10mm thick stainless steel plate, with a 14mm wide groove. The drive lever 306 is fitted with the groove with a clearance of 0.3mm. A first rotating shaft 308 (20mm in diameter) is welded to one end of the second connecting plate 307. The first rotating shaft 308 is rotatably connected to the connecting bracket 302 via a bearing seat. A first gear 309 of model M1.5×20 is keyed to the rotating shaft. The second gear 310 meshes with the first gear 309 (both have the same module of 1.5). The center key of the second gear 310 is connected to the second rotating shaft 311. A third gear 312 (with the same module as the second gear 310) is keyed to the second rotating shaft 311. The third gear 312 meshes with the fourth gear 313. The center key of the fourth gear 313 is connected to the third rotating shaft 314. Both the second rotating shaft 311 and the third rotating shaft 314 have a swing connecting pipe 315 (a stainless steel pipe with a diameter of 32mm) welded to one end. The swing connecting pipe 315 is connected to the water outlet of the water pump 4 through a hose. Twelve sets of cleaning nozzles 316 (model is a fan-shaped spray nozzle with a spray angle of 60°) are welded to its side wall, with a nozzle spacing of 50mm.

[0049] The drive rod 304, the first rotating shaft 308, the second rotating shaft 311, and the third rotating shaft 314 are all rotatably connected to the connecting bracket 302 via deep groove ball bearing seats. The swing connecting pipe 315 is rotatably connected to the connecting housing 1 via a thrust bearing seat, ensuring smooth operation of all rotating components. The water pump 4, the drive motor 201, and the rotating motor 303 are all electrically connected to the controller 5 via copper core wires, realizing centralized automated control.

[0050] Example 4 In another preferred embodiment, based on embodiments 1 to 3, this embodiment provides a plate heat exchanger chemical heat recovery method, which is based on the plate heat exchanger chemical heat recovery device described in embodiment 3. It is applied to the heat recovery and heat exchanger plate maintenance of dust-laden high-temperature flue gas in a chemical enterprise. The specific implementation steps are as follows: Step 1: After the device has been running for 6 months, it was detected that the heat exchange efficiency has decreased by 15% compared with the initial value. It was determined that there was a blockage between the moving heat exchange plates 204. The controller 5 issued a command to start the drive motor 201 and set the motor speed to 1440 r / min. The drive motor 201 drove the lead screw 207 to rotate. Since the lead screw 207 is a left-hand + right-hand integrated structure, the two sets of moving sliders 208 move in opposite directions at a speed of 5 mm / s. Through the rotating pull rod 209 and the moving connecting block 210, the moving connecting plate 205 is driven to slide smoothly along the connecting guide post 203 and the connecting bracket 202. Then, through the connecting rotating plate 206, the 10 sets of moving heat exchange plates 204 are evenly separated. Finally, the distance between adjacent heat exchange plates is adjusted to 50 mm to provide sufficient space for cleaning. This process takes 2 minutes.

[0051] Step 2: Keep the drive motor 201 stopped, and start the rotary motor 303 through the controller 5. Set the motor speed to 2880 r / min. The rotary motor 303 drives the drive rod 304, the first connecting plate 305, and the drive lever 306 to rotate in sequence. The drive lever 306, through its cooperation with the sliding groove on the second connecting plate 307, drives the second connecting plate 307 to swing back and forth around the first rotating shaft 308 (swing angle ±30°). The second connecting plate 307 drives the first gear 309 to swing. Through the meshing transmission of the second gear 310, the third gear 312, and the fourth gear 313, the second rotating shaft 311 and the third rotating shaft 314 to rotate back and forth in opposite directions (speed 60 r / min). Finally, the cleaning nozzle 316 on the swing connecting pipe 315 swings back and forth between the moving heat exchange plates 204 to achieve full coverage of the heat exchange plate surface.

[0052] Step 3: Start water pump 4 through controller 5, set water pump 4 outlet pressure to 0.6MPa and flow rate to 20m³ / h. Water flows through hose to swing connecting pipe 315, and then sprays out fan-shaped water flow from 12 sets of cleaning nozzles 316 to flush and clean the dust, scale and other blockages between the moving heat exchange plates 204. The cleaning process lasts for 15 minutes. The wastewater after cleaning, carrying the dirt, is discharged from the outlet pipe 6 at the bottom of the connecting box 1. After being treated by the wastewater treatment equipment, it meets the discharge standards.

[0053] Step 4: After cleaning, the controller 5 controls the drive motor 201 to run in reverse, maintaining a speed of 1440 r / min. The drive motor 201 drives the lead screw 207 to rotate in the opposite direction, causing the two sets of moving sliders 208 to move in opposite directions. Through the rotating pull rod 209 and the moving connecting block 210, the moving connecting plate 205 moves in the opposite direction. Then, through the connecting rotating plate 206, the moving heat exchange plates 204 move closer together and clamp, ultimately restoring the distance between adjacent heat exchange plates to the initial 15 mm, completing the sealing between the multiple sets of moving heat exchange plates 204. At this point, the heat exchange efficiency is tested and shows an 18% increase compared to before cleaning, restoring to over 98% of the initial heat exchange efficiency, meeting the production process requirements.

[0054] This embodiment achieves non-disassembly cleaning and sealing adjustment of the heat exchange plate through automated control. The entire maintenance process takes only 18 minutes, which significantly saves labor costs and downtime compared to the traditional manual disassembly and cleaning method (which takes more than 4 hours). At the same time, the heat exchange efficiency is significantly improved, effectively reducing energy waste.

[0055] In a preferred embodiment, the adjustable heat exchanger plate spacing structure 2 further includes a fixed connecting plate 200, which is installed on the side wall of the connecting housing 1. A drive motor 201 is installed on the other side wall of the connecting housing 1. A connecting bracket 202 and multiple sets of connecting guide pillars 203 are installed on the fixed connecting plate 200. Multiple sets of movable heat exchanger plates 204 are slidably mounted on the connecting guide pillars 203. A movable connecting plate 205 is slidably mounted on the connecting bracket 202 and the connecting guide pillars 203 at one end of the movable heat exchanger plate 204. Multiple sets of connecting rotating plates 206 are rotatably connected to the side wall of the hot plate 204. The two ends of the connecting rotating plates 206 are respectively connected to a fixed connecting plate 200 and a movable connecting plate 205. The movable connecting block 210 is mounted on the side wall of the movable connecting plate 205, and multiple sets of heat exchange tubes 211 are installed on the fixed connecting plate 200. With this configuration, the drive motor 201 drives the lead screw 207 and other components, causing the movable connecting plate 205 to move along the connecting guide post 203, which in turn drives the movable heat exchange plate 204 to flexibly adjust its spacing via the connecting rotating plates 206. This adjustable structure can precisely control the spacing of the heat exchange plates according to different chemical heat recovery conditions, optimizing heat exchange efficiency. When handling high-heat, high-flow-rate media, increasing the spacing enhances flowability; when handling low-heat, low-flow-rate media, decreasing the spacing improves the utilization rate of the heat exchange area. Simultaneously, the multiple sets of heat exchange tubes 211, in conjunction with the movable heat exchange plate 204, further enhance heat transfer, effectively improving overall heat exchange performance and reducing energy loss. Furthermore, the structure is built upon components such as the fixed connecting plate 200 and the connecting bracket 202, making it stable and reliable, adaptable to complex chemical environments, and ensuring long-term stable operation of the equipment.

[0056] In a preferred embodiment, both the movable heat exchange plate 204 and the movable connecting plate 205 are provided with connecting holes adapted to the connecting guide post 203, and the connecting guide post 203 is slidably connected to the connecting holes. This arrangement allows the movable heat exchange plate 204 and the movable connecting plate 205 to slide smoothly along the connecting guide post 203, effectively ensuring the accuracy of their relative positions, reducing shaking and deviation during operation, and thus improving the working stability and heat exchange efficiency of the entire heat exchange device.

[0057] In a preferred embodiment, the movable connecting plate 205 has a sliding groove adapted to the connecting bracket 202, and the connecting bracket 202 is slidably connected to the sliding groove; the heat exchange tube 211 passes through the fixed connecting plate 200 and is connected to the movable heat exchange plate 204 and the movable connecting plate 205. Both the movable heat exchange plate 204 and the movable connecting plate 205 have connecting holes adapted to the heat exchange tube 211, and the heat exchange tube 211 is clearance-fitted with the connecting holes. The above configuration allows the movable connecting plate 205 to slide smoothly along the connecting bracket 202, and the movable heat exchange plate 204 and the movable connecting plate 205 can adjust their positions as they slide, ensuring that the heat exchange tube 211 is tightly connected to both, ensuring effective heat transfer, and improving the overall performance and stability of the heat exchange device.

[0058] In a preferred embodiment, the movable heat exchange plate 204 and the connecting rotating plate 206 are rotatably connected via a connecting shaft, and the lead screw 207 is integrally formed from a left-handed lead screw and a right-handed lead screw. This configuration allows the movable heat exchange plate 204 to move in opposite directions or away from each other along the connecting rotating plate 206 under the drive of the lead screw 207, precisely adjusting the heat exchange spacing. The combination of left-handed and right-handed lead screws ensures synchronous movement on both sides, improving heat exchange efficiency and equipment stability.

[0059] In a preferred embodiment, the lead screw 207 is rotatably connected to the connecting bracket 202 via a bearing seat. The connecting bracket 202 has a groove adapted to the movable slider 208, and the movable slider 208 is slidably connected to the groove. This configuration allows the movable slider 208 to move precisely and linearly along the groove when the lead screw 207 rotates, achieving stable transmission. This design is not only compact but also effectively reduces transmission errors, improves the overall stability and reliability of the device, and meets the needs of various complex working conditions.

[0060] In a preferred embodiment, the movable slider 208 and the rotating pull rod 209, and the rotating pull rod 209 and the movable connecting block 210 are all rotatably connected via a rotating shaft. This arrangement allows the movable slider 208 to drive the rotating pull rod 209 to rotate around the rotating shaft when sliding, and the rotating pull rod 209 can in turn drive the movable connecting block 210 to perform corresponding movements. This achieves flexible linkage between the components and meets the precise requirements for the device's actions under different working conditions.

[0061] In a preferred embodiment, the oscillating flushing structure 3 includes a connecting housing 301, which is connected to the connecting box 1 via a connecting plate. A connecting bracket 302 is installed inside the connecting housing 301, which is connected to a rotating motor 303 via a connecting seat. The driving end of the rotating motor 303 is connected to a driving rod 304 via a coupling. A first connecting plate 305 is installed at the other end of the driving rod 304, and the other end of the first connecting plate 305 is connected to a driving lever 306. A second connecting plate 307 is connected to the driving lever 306, and one end of the second connecting plate 307 is connected to a first rotating shaft 308. A first gear 309 is installed on the first rotating shaft 308, and the first gear 309 meshes with a second gear 310. A second rotating shaft 311 is installed at the center of wheel 310. A third gear 312 is installed on the second rotating shaft 311, and the third gear 312 meshes with a fourth gear 313. A third rotating shaft 314 is installed at the center of the fourth gear 313. One end of both the second rotating shaft 311 and the third rotating shaft 314 is connected to a swing connecting pipe 315. The swing connecting pipe 315 is connected to the water outlet of the water pump 4 through a hose, and multiple sets of cleaning nozzles 316 are installed on its side wall. With the above configuration, when the rotating motor 303 starts, it drives the first gear 309 to drive the second gear 310, and the third gear 312 to drive the fourth gear 313 to rotate in sequence through the drive rod 304, the first connecting plate 305, and other components, ultimately driving the swing connecting pipe 315 to swing regularly. The water pump 4 delivers water to the swing connecting pipe 315, and the multiple sets of cleaning nozzles 316 spray water from all directions to clean the heat exchange plate without dead angles. This oscillating flushing method, compared to traditional fixed flushing, can cover a larger area, effectively removing dirt and impurities from the surface of the heat exchange plates and avoiding localized residue. It not only improves the cleaning efficiency of the heat exchanger and reduces the frequency and difficulty of manual cleaning, but also ensures good heat exchange performance of the heat exchange plates, extends equipment lifespan, ensures stable and efficient operation of the chemical heat recovery unit, and reduces the risk of increased energy consumption and equipment failure due to dirt accumulation.

[0062] In the preferred embodiment, the drive rod 304, the first rotating shaft 308, the second rotating shaft 311, and the third rotating shaft 314 are all rotatably connected to the connecting bracket 302 via bearing seats, and the swing connecting pipe 315 is rotatably connected to the connecting housing 1 via a bearing seat. This configuration ensures low friction and flexible rotation of each component during operation, significantly reducing energy loss. Simultaneously, this connection method offers high stability, can withstand large loads, effectively extends the equipment's service life, and provides a solid guarantee for the reliable operation of the entire device.

[0063] In summary, this invention proposes a plate heat exchanger-based chemical heat recovery device and method, effectively solving specific technical problems existing in the heat recovery process of high-temperature dusty flue gas in the smelting and chemical industries. After prolonged operation, existing plate heat exchangers experience a significant decrease in the sealing between the heat exchange plates, leading to reduced heat exchange efficiency, and the accumulation of dirt on the surface hinders heat transfer. Manual disassembly, cleaning, and tightening of the heat exchanger are typically required, which is time-consuming, labor-intensive, and disrupts production line operation. This invention aims to overcome these limitations and achieve efficient and automated heat recovery.

[0064] This invention designs an adjustable spacing structure 2, utilizing a drive motor 201 to drive a lead screw 207, which in turn drives related components to achieve precise clamping and uniform separation of the moving heat exchange plates 204. This solves the problem of poor sealing of heat exchange plates in traditional devices, requiring manual disassembly and tightening. The lead screw 207 adopts a left-handed + right-handed integrated structure, which can drive two sets of sliders 208 to move synchronously in opposite directions or relative to each other, ensuring consistent spacing adjustment of multiple sets of moving heat exchange plates 204. Furthermore, it can flexibly adjust the heat exchange plate spacing according to the temperature, flow rate, and dust content of the flue gas under different operating conditions. The moving heat exchange plates 204 are adjusted in position within the adjustable spacing structure 2 through the cooperation of components such as the moving connecting plate 205, pull rod 209, and moving connecting block 210. This structure not only solves the sealing problem and ensures heat recovery efficiency, thus improving the overall performance of the heat exchange device, but also ensures consistent spacing adjustment, effectively improving the sealing effect and cleaning quality.

[0065] This invention employs a swing-type flushing structure 3. A rotating motor 303 drives a gear transmission mechanism composed of multiple gears, including a first gear 309, a second gear 310, a third gear 312, and a fourth gear 313. This drives the swing connecting pipe 315 and the cleaning nozzle 316 to reciprocate between the moving heat exchange plates 204 for comprehensive flushing, achieving blockage removal without disassembling the heat exchange plates. In the swing-type flushing structure 3, the drive lever 306 engages with the sliding groove of the second connecting plate 307, and the combined gear meshing transmission enables the cleaning nozzle 316 to swing at a large angle. Furthermore, the cleaning nozzle 316 can automatically adjust its swing speed and water pressure according to the degree and distribution of dirt on the heat exchange plates. This structure achieves comprehensive blockage removal, significantly reduces manual labor intensity, avoids damage to the heat exchange plates, and fully covers the surface and gaps of the heat exchange plates. The oscillating flushing structure 3 achieves stable operation through the cooperation of components such as the connecting housing 301, connecting bracket 302, driving rod 304, first connecting plate 305, first rotating shaft 308, second rotating shaft 311, and third rotating shaft 314.

[0066] This invention electrically connects the water pump 4, drive motor 201, and rotary motor 303 to the controller 5, realizing automated control of spacing adjustment and cleaning operations. This highly adapts to the efficient production needs of industrial scenarios and improves the level of production automation. The water pump 4 delivers water to the oscillating flushing structure 3 for cleaning operations via the outlet pipe 6.

[0067] Furthermore, the device of this invention has a compact overall structure. The connecting housing 1, as the main load-bearing component, integrates heat exchange and cleaning functions. Its adjustable spacing structure 2 is securely connected to the connecting housing 1 through components such as the fixed connecting plate 200, connecting bracket 202, and connecting guide post 203. The heat exchange tube 211 is installed inside the connecting housing 1 to achieve heat exchange. It is easy to install and has low maintenance costs, making it highly adaptable to complex working conditions. Overall, this invention solves the problems of traditional devices from multiple aspects through various unique designs, demonstrating significant advantages in the field of heat exchange devices.

Claims

1. A plate heat exchanger chemical heat recovery device, characterized in that: The system includes a connecting housing (1), which houses an adjustable heat exchange plate spacing structure (2) and a corresponding swing flushing structure (3). A water pump (4) is connected to the end face of the connecting housing (1), a controller (5) is connected to the side wall, and a water outlet pipe (6) is provided at the bottom. The adjustable heat exchange plate spacing structure (2) includes a drive motor (201) and a movable heat exchange plate (204). The drive end of the drive motor (201) is connected to a lead screw (207), and a slider (208) is screwed onto the lead screw (207). The slider (208) is connected to a movable connecting block (210) via a pull rod (209). A movable connecting plate (205) is slidably installed at one end of the movable heat exchange plate (204), and a connecting rotating plate (206) is rotatably installed on one side. The swing flushing structure (3) includes a rotating motor (303). The drive end of the motor (303) is connected to the rotating rod (304). The other end of the rotating rod (304) is equipped with a first connecting plate (305). The other end of the first connecting plate (305) is rotatably equipped with a lever (306). The lever (306) is clamped on the second connecting plate (307). The second connecting plate (307) is rotatably mounted on the first rotating shaft (308). The first rotating shaft (308) is equipped with a first gear (309). The first gear (309) drives the third gear (312) to rotate through the second rotating shaft (311) of the second gear (310). The third gear (312) drives the fourth gear (313) that meshes with it to rotate. The fourth gear (313) is mounted on the third rotating shaft (314). The water pump (4), the drive motor (201), and the rotating motor (303) are all electrically connected to the controller (5) through wires.

2. The plate heat exchanger chemical heat recovery device according to claim 1, characterized in that: The adjustable heat exchange plate spacing structure (2) also includes a fixed connecting plate (200), which is installed on the side wall of the connecting box (1). A drive motor (201) is installed on the other side wall of the connecting box (1). A connecting bracket (202) and multiple sets of connecting guide columns (203) are installed on the fixed connecting plate (200). Multiple sets of movable heat exchange plates (204) are slidably assembled on the connecting guide columns (203). A movable connecting plate (205) is slidably assembled on the connecting bracket (202) and the connecting guide columns (203) and located at one end of the movable heat exchange plate (204). Multiple sets of connecting rotating plates (206) are rotatably connected to the side wall of the movable heat exchange plate (204). The two ends of the connecting rotating plates (206) are respectively connected to the fixed connecting plate (200) and the movable connecting plate (205). The movable connecting block (210) is installed on the side wall of the movable connecting plate (205). Multiple sets of heat exchange tubes (211) are installed on the fixed connecting plate (200).

3. A plate heat exchanger chemical heat recovery device according to claim 2, characterized in that: Both the movable heat exchange plate (204) and the movable connecting plate (205) are provided with connecting holes adapted to the connecting guide post (203), and the connecting guide post (203) is slidably connected to the connecting hole.

4. A plate heat exchanger chemical heat recovery device according to claim 2, characterized in that: The movable connecting plate (205) is provided with a sliding groove adapted to the connecting bracket (202), and the connecting bracket (202) is slidably connected to the sliding groove; the heat exchange tube (211) passes through the fixed connecting plate (200) and is connected to the movable heat exchange plate (204) and the movable connecting plate (205). The movable heat exchange plate (204) and the movable connecting plate (205) are both provided with a connecting hole adapted to the heat exchange tube (211), and the heat exchange tube (211) is clearance-fitted with the connecting hole.

5. A plate heat exchanger chemical heat recovery device according to claim 2, characterized in that: The movable heat exchange plate (204) and the connecting rotating plate (206) are rotatably connected by a connecting shaft, and the lead screw (207) is integrally formed by a left-hand lead screw and a right-hand lead screw.

6. A plate heat exchanger chemical heat recovery device according to claim 2, characterized in that: The lead screw (207) is rotatably connected to the connecting bracket (202) through a bearing seat. The connecting bracket (202) has a groove adapted to the movable slider (208). The movable slider (208) is slidably connected to the groove. The movable slider (208) and the rotating pull rod (209), and the rotating pull rod (209) and the movable connecting block (210) are all rotatably connected through a rotating shaft.

7. A plate heat exchanger chemical heat recovery device according to claim 1, characterized in that: The swing flushing structure (3) includes a connecting housing (301), which is connected to the connecting box (1) via a connecting plate. A connecting bracket (302) is installed inside the connecting housing. The connecting bracket (302) is connected to a rotating motor (303) via a connecting seat. The driving end of the rotating motor (303) is connected to a driving rod (304) via a coupling. A first connecting plate (305) is installed at the other end of the driving rod (304). The other end of the first connecting plate (305) is connected to a driving lever (306). A second connecting plate (307) is connected to the driving lever (306). One end of the second connecting plate (307) is connected to the first rotating shaft (308). The first shaft (308) is equipped with a first gear (309), which meshes with a second gear (310). A second shaft (311) is installed at the center of the second gear (310). A third gear (312) is installed on the second shaft (311), which meshes with a fourth gear (313). A third shaft (314) is installed at the center of the fourth gear (313). One end of the second shaft (311) and the third shaft (314) are connected to a swing connecting pipe (315). The swing connecting pipe (315) is connected to the water outlet of the water pump (4) through a hose. Multiple sets of cleaning nozzles (316) are installed on its side wall.

8. A plate heat exchanger chemical heat recovery device according to claim 8, characterized in that: The drive rod (304), the first shaft (308), the second shaft (311), and the third shaft (314) are all rotatably connected to the connecting bracket (302) through bearing seats, and the swing connecting pipe (315) is rotatably connected to the connecting box (1) through bearing seats.

9. A plate heat exchanger chemical heat recovery device according to claim 8, characterized in that: The second connecting plate (307) has a sliding groove adapted to the drive lever (306), and the drive lever (306) is in clearance fit with the sliding groove.

10. A method for recovering chemical heat using a plate heat exchanger, characterized in that, A method for heat recovery based on a plate heat exchanger chemical heat recovery device according to any one of claims 1 to 9 includes the following steps: Step 1: Control the drive motor (201) to run through the controller (5). The drive motor (201) drives the lead screw (207) to rotate, which in turn drives the two sets of sliders (208) to move in opposite directions. Through the transmission structure, the moving heat exchange plate (204) is evenly separated. Step 2: Control the rotation motor (303) to run through the controller (5). The rotation motor (303) drives the drive rod (304), the first connecting plate (305), and the drive lever (306) to rotate in sequence, driving the second connecting plate (307) to swing. Through gear transmission, the second rotating shaft (311) and the third rotating shaft (314) rotate in opposite directions, causing the cleaning nozzle (316) on the swing connecting pipe (315) to swing back and forth between the moving heat exchange plate (204). Step 3: Start the water pump (4) through the controller (5), and water is sprayed out from the cleaning nozzle (316) to flush and clean the moving heat exchange plate (204) and remove the blockage between multiple sets of moving heat exchange plates (204); Step 4: After clearing the blockage, the drive motor (201) is controlled by the controller (5) to run. The drive motor (201) drives the lead screw (207) to rotate, which in turn drives the two sets of sliders (208) to move in opposite directions. The moving connecting plate (205) is moved by the pull rod (209) and the moving connecting block (210), and then the moving heat exchange plate (204) is moved and clamped by the connecting plate (206) to complete the sealing between the multiple sets of moving heat exchange plates (204).

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