A waste heat recycling system of a hot galvanizing process and a method of using the same

Abstract

The application relates to a waste heat recycling system of a hot galvanizing process and a utilization method thereof, and relates to the technical field of waste heat recovery devices. The system comprises a galvanizing pool, a collecting box, a heat exchange pipe and a filtering box. The collecting box is located at one side of the galvanizing pool. A water inlet pipe is communicated with the top wall of the collecting box. A water outlet pipe is communicated with the bottom of the collecting box. The heat exchange pipe is arranged in the collecting box. One end of the heat exchange pipe is aligned with the galvanizing pool and is used for collecting the flue gas generated in the galvanizing pool. The other end of the heat exchange pipe is communicated with the top of the filtering box. The top of the filtering box is provided with a spraying assembly. The filtering box is provided with a filtering plate. The filtering plate is horizontally arranged below the spraying assembly. The filtering box is provided with a cleaning mechanism. The cleaning mechanism comprises a driving assembly and a cleaning plate. The driving assembly is arranged on the filtering box. The driving assembly is connected with the cleaning plate and is used for driving the cleaning plate to clean the filtering plate. The application cleans the filtering plate, so that the filtering effect of the filtering plate on the flue gas is long-term effective.

Description

Technical Field

[0001] This application relates to the field of waste heat recovery devices, and in particular to a waste heat recovery system and method for hot-dip galvanizing process. Background Technology

[0002] In the field of hot-dip galvanizing, it is an important metal corrosion protection method widely used in industrial production. With the continuous development of industry, hot-dip galvanizing plays a key role in many industries, providing metal products with excellent corrosion resistance and extending their service life. It is widely used in construction, machinery manufacturing, power and other fields, and is of great significance for ensuring product quality and improving production efficiency.

[0003] In related technologies, Chinese patent CN112251698B discloses a waste heat utilization device for hot-dip galvanized steel strip production, including a base, a heat exchange box fixedly connected to the upper left of the base, a heating seat fixedly connected to the upper right of the base, a galvanizing pot fixedly connected to the upper middle of the heating seat, an air suction device fixedly connected to the upper middle of the heat exchange box, a water inlet pipe fixedly connected to the upper left of the heat exchange box, an exhaust fan fixedly connected to the upper right of the heat exchange box, an air suction pipe fixedly connected to the upper middle of the exhaust fan, a processing box fixedly connected to the left middle of the heat exchange box, a purification device movably connected to the upper end of the processing box, and a water outlet pipe fixedly connected to the lower left of the heat exchange box.

[0004] However, when flue gas is filtered in the treatment box, impurities in the flue gas are blocked on the filter screen, causing the impurities to gradually accumulate on the filter screen and easily clog the pores of the filter screen, making it impossible for flue gas to pass through. As a result, the filter screen loses its filtering function and cannot be used for a long time, so it needs to be improved. Summary of the Invention

[0005] To address the problem of impurities accumulating on filter screens over a long period, thus affecting filtration efficiency, this application provides a waste heat recovery system and method for the hot-dip galvanizing process.

[0006] Firstly, the waste heat recovery system and method for hot-dip galvanizing process provided in this application adopt the following technical solution: A waste heat recovery system for a hot-dip galvanizing process includes a galvanizing tank, a collection box, a heat exchange tube, and a filter box. The collection box is located on one side of the galvanizing tank. An inlet pipe is connected to the top wall of the collection box, and an outlet pipe is connected to the bottom of the collection box. The heat exchange tube is located in the collection box, with one end aligned with the galvanizing tank to collect the flue gas generated in the galvanizing tank. The other end of the heat exchange tube is connected to the top of the filter box. A spray assembly is provided on the top of the filter box. A filter plate is provided in the filter box and is horizontally mounted below the spray assembly. A cleaning mechanism is provided on the filter box. The cleaning mechanism includes a drive assembly and a cleaning plate. The drive assembly is located on the filter box and is connected to the cleaning plate to drive the cleaning plate to scrape the filter plate.

[0007] By adopting the above technical solution, during use, the product to be galvanized is placed in the galvanizing bath for galvanizing. When the product generates flue gas during galvanizing, the end of the heat exchange tube draws the flue gas into the heat exchange tube. At this time, the water inlet pipe flows cold water into the collection box, and the heat exchange tube is submerged in the cold water, thereby transferring the heat contained in the flue gas to the cold water to heat the water. This process utilizes water to recover heat, and the heated water is then used in conjunction with the water outlet pipe, which improves the reuse rate of waste heat from the flue gas and saves energy.

[0008] The flue gas in the heat exchange tubes is eventually discharged into the filter box. After being purified by the spray assembly at the top of the filter box, the flue gas passes through the filter plates, which filter out impurities. The purified flue gas is then discharged from the filter box, making it more environmentally friendly. However, some impurities remain on the filter plates. At this point, the drive assembly is activated, causing the cleaning plate to slide on the filter plates, scraping them clean and preventing impurities from accumulating on the filter plates, which would affect the filtration effect and ensure the long-term effectiveness of the filter plates.

[0009] Optionally, the filter box is provided with a purification plate, which is located below the filter plate and parallel to the filter plate, and the diameter of the pores on the purification plate is smaller than the diameter of the pores on the filter plate.

[0010] By adopting the above technical solution, the purification plate further purifies the flue gas filtered by the filter plate and the purification agent sprayed by the spray assembly, removing smaller particulate impurities and harmful substances.

[0011] Optionally, the filter plate and the purification plate separate the filter box, forming a clean area between them. The filter box is equipped with a rotating motor, which drives the filter plate to rotate. The cleaning plate can move within the clean area, with its top wall in contact with the filter plate and its bottom wall in contact with the purification plate. A cleaning box is provided on one side of the filter box, and the cleaning box is connected to the clean area. The driving assembly drives the cleaning plate to move towards or away from the cleaning box.

[0012] By adopting the above technical solution, when flue gas passes through the filter plate and the purification plate in sequence, impurities remain on the upper surface of the filter plate and the purification plate. When it is necessary to clean the filter plate and the purification plate, the rotating motor is started to drive the filter plate to rotate, so that the upward side of the filter plate turns downward, that is, aligned with the cleaning zone. At this time, the side of the filter plate and the purification plate with impurities attached are both in the cleaning zone. At this time, the drive component drives the cleaning plate to move in the cleaning zone, pushing the impurities into the cleaning box. During this process, the upper and lower sides of the cleaning plate abut against the filter plate and the purification plate respectively, so that the movement of the cleaning plate can simultaneously clean the filter plate and the purification plate, improving the cleaning efficiency.

[0013] Optionally, the drive assembly includes a moving block and a moving cylinder. A moving hole is provided through the side wall of the filter box relative to the cleaning box. The moving block is inserted into the moving hole. The moving cylinder is disposed on the filter box. The output end of the moving cylinder is connected to the moving block. The moving cylinder is used to drive the moving block to move towards or away from the cleaning box in the cleaning area. The cleaning plate is disposed on the side of the moving block near the cleaning box.

[0014] By adopting the above technical solution, in the initial state, the moving block is located outside the clean zone, and the end wall of the moving block is sealed with the moving hole. At this time, the clean zone is a hollow area to allow the passage of flue gas and purifying agent. After the flue gas is filtered by the filter plate, part of it enters the clean box and is discharged, while the other part, containing impurities and being heavier, falls downwards after adsorbing the purifying agent. After passing through the purification plate, it becomes relatively clean gas and can shuttle back and forth on both sides of the purification plate, thus passing under the purification plate and returning to the clean zone, and then entering the clean box for discharge. When it is necessary to clean the filter plate and purification plate, the filter plate flips up and down, and the moving cylinder is activated, driving the moving block to move the cleaning plate deeper into the clean zone. This causes the cleaning plate to slide against the filter plate and purification plate, thereby scraping off the impurities on the filter plate and purification plate and pushing the impurities to move into the clean box, thus cleaning the filter plate and purification plate to provide long-term filtration effect.

[0015] Optionally, the cleaning box is provided with an arc plate, which is located on a circular trajectory with the side of the filter plate closest to the cleaning box as the axis and the cleaning area as the radius. The cross-section of the arc plate is a quarter-circle structure, and the bottom end of the arc plate is fixed to the purification plate.

[0016] By adopting the above technical solution, after the cleaning plate pushes the impurities and some of the purifying agent left in the cleaning area into the cleaning box, the impurities and purifying agent are located on the arc plate. The arc plate acts as a guide, allowing the purifying agent to flow back to the top of the purifying plate along the trajectory of the arc plate. After filtration, it is stored below the purifying plate, so that only impurities are collected and stored in the cleaning box, while the purifying agent is still at the bottom of the filter box, so as to be recycled and reduce resource waste.

[0017] Optionally, a rotating assembly is provided at the connection between the cleaning box and the filter box. The rotating assembly is connected to the cleaning plate and is used to drive the bottom of the cleaning plate to slide on the arc plate. The rotating assembly includes a rotating gear and a rotating rack. The top of the cleaning plate is rotatably connected to the moving block through a rotating shaft. The rotating gear is coaxially sleeved on the rotating shaft and fixed to the rotating shaft. The rotating rack is horizontally arranged and fixed to the inner wall of the cleaning box. The rotating gear can mesh with the rotating rack.

[0018] By adopting the above technical solution, after the moving block drives the cleaning plate to clean the filter plate and the purification plate, the cleaning plate moves to the connection between the filter box and the cleaning box. At this time, the moving block continues to move, driving the cleaning plate to gradually insert into the cleaning box, so that the rotating gear meshes with the rotating rack and slides on the rotating rack. This causes the rotating gear to drive the rotating shaft to rotate, causing the cleaning plate to push the impurities upward along the trajectory of the arc plate, so that the impurities move to the top opening of the cleaning box for centralized cleaning.

[0019] Optionally, the cleaning box is provided with a collection mechanism located at the top of the cleaning box for collecting impurities on the cleaning plate. The collection mechanism includes a sliding assembly and two receiving plates. The sliding assembly is disposed on the cleaning box and connected to the two receiving plates. The two receiving plates are arranged symmetrically about the central axis of the cleaning box. The receiving plates can abut against the side of the cleaning plate away from the moving block. The sliding assembly is used to drive the two receiving plates closer to or further away from each other.

[0020] By adopting the above technical solution, in the initial state, the sliding component drives the two receiving plates away from each other, so that the two receiving plates are in an open state. When the cleaning plate pushes the impurities to the opening of the cleaning box, the cleaning plate is located between the two receiving plates. At this time, the cleaning plate is in a horizontal state and can abut against the receiving plates. Then, the sliding component is activated to drive the two receiving plates closer to each other. During this process, the receiving plates push and slide on the cleaning plate, thereby scooping up the impurities on the cleaning plate and causing the impurities to fall onto the receiving plates. When the two receiving plates abut against each other, the two receiving plates are spliced ​​into a complete plate-shaped structure. At this time, all the impurities are on this plate-shaped structure. Then, the receiving plates are moved upward, so that the receiving plates are removed from the cleaning box, thus achieving the cleaning of impurities.

[0021] Optionally, the sliding assembly includes a mounting plate, a sliding gear, and two sliding racks. A positioning rod is fixed to the top of the cleaning box. A positioning hole is provided through the mounting plate, and the positioning rod can be inserted into the positioning hole. The sliding gear is rotatably connected to the mounting plate, and the sliding racks are slidably connected to the mounting plate. The sliding gear is located between the two sliding racks, and the sliding racks mesh with the sliding gear. The two sliding racks correspond one-to-one with the receiving plates, and the sliding racks are fixed to the corresponding receiving plates.

[0022] By adopting the above technical solution, the positioning rod can be inserted into the positioning hole to achieve the positioning of the mounting plate on the cleaning box and ensure the stability of the mounting plate. Then, the sliding gear is driven to rotate, causing the two sliding racks to move relative to each other, thereby allowing the two receiving plates to move closer or further apart. Optionally, one of the receiving plates has a plurality of through holes arranged at intervals along the length of the receiving plate, and the other receiving plate has a plurality of mounting holes arranged at intervals along the length of the receiving plate. The plurality of through holes and mounting holes are staggered, so that one of the receiving plates can be inserted into the mounting holes and the other receiving plate can be inserted into the through holes, so that the two receiving plates can be spliced ​​together.

[0023] By adopting the above technical solution, the design of the insertion hole and mounting hole increases the contact area between the receiving plate and the impurities when scraping them, thereby improving the collection of impurities.

[0024] Secondly, this application provides a method for utilizing the waste heat recovery system of a hot-dip galvanizing process, comprising the following steps: S1. The flue gas generated in the galvanizing tank is collected through heat exchange tubes. Cold water is introduced into the collection box through the inlet pipe. At this time, the heat exchange tubes are immersed in the cold water. The high temperature flue gas transfers heat to the heat exchange tubes, and then the heat exchange tubes heat the cold water. Finally, the hot water is discharged through the outlet pipe for use. S2. The flue gas in the heat exchange tube is finally discharged into the filter box. After being initially purified by the spray assembly at the top of the filter box, the flue gas undergoes multi-stage filtration through the filter plate and the purification plate in sequence. S3. Start the drive assembly to move the cleaning plate inside the filter box to scrape impurities from the surface of the filter plate. S4. When the cleaning plate moves to the vicinity of the cleaning box, the cleaning plate is driven to rotate by the rotating component, thereby guiding the scraped impurities to the cleaning box. S5. Impurities on the collection cleaning plate are held in place by two receiving plates of the collection mechanism.

[0025] In summary, this application includes at least one of the following beneficial effects: 1. When flue gas passes through the filter plate and the purification plate in sequence, impurities are left on the upper surface of the filter plate and the purification plate. When it is necessary to clean the filter plate and the purification plate, start the rotating motor to drive the filter plate to rotate so that the upward side of the filter plate turns downward, that is, aligned with the cleaning area. At this time, the side of the filter plate and the purification plate with impurities attached are both in the cleaning area. At this time, the drive component drives the cleaning plate to move in the cleaning area, pushing the impurities into the cleaning box. During this process, the upper and lower sides of the cleaning plate abut against the filter plate and the purification plate respectively, so that the movement of the cleaning plate can simultaneously scrape the filter plate and the purification plate, improving the cleaning efficiency. 2. In the initial state, the sliding assembly drives the two receiving plates away from each other, so that the two receiving plates are in an open state. When the cleaning plate pushes the impurities to the opening of the cleaning box, the cleaning plate is located between the two receiving plates. At this time, the cleaning plate is in a horizontal state and can abut against the receiving plates. Then, the sliding assembly is activated to drive the two receiving plates closer to each other. During this process, the receiving plates push and slide on the cleaning plate, thereby scooping up the impurities on the cleaning plate and causing the impurities to fall onto the receiving plates. When the two receiving plates abut against each other, the two receiving plates are spliced ​​into a complete plate-shaped structure. At this time, all the impurities are on this plate-shaped structure. Then, the receiving plates are moved upward, so that the receiving plates are removed from the cleaning box, thus cleaning the impurities. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the waste heat recovery system of the hot-dip galvanizing process in an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the collection box; Figure 3 A schematic diagram of the internal structure of the filter box and the cleaning box; Figure 4 This is a schematic diagram of the collection mechanism.

[0027] In the diagram: 10. Filter box; 11. Spray assembly; 12. Cleaning area; 13. Moving hole; 20. Filter plate; 21. Rotating motor; 30. Cleaning mechanism; 31. Drive assembly; 311. Moving block; 312. Moving cylinder; 32. Cleaning plate; 40. Purification plate; 50. Cleaning box; 51. Arc plate; 52. Positioning rod; 60. Rotating assembly; 61. Rotating gear; 62. Rotating rack; 70. Collection mechanism; 71. Sliding assembly; 711. Mounting plate; 7111. Positioning hole; 712. Sliding gear; 713. Sliding rack; 72. Receiving plate; 721. Insertion hole; 722. Mounting hole; 80. Galvanizing tank; 90. Collection box; 91. Inlet pipe; 92. Outlet pipe; 140. Heat exchanger tube. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0029] This application discloses a waste heat recovery system for a hot-dip galvanizing process. (Refer to...) Figure 1 2. The waste heat recovery system of the hot-dip galvanizing process includes a galvanizing tank 80, a collection box 90, a heat exchange tube 140, and a filter box 10. The collection box 90 is located on one side of the galvanizing tank 80. The heat exchange tube 140 is installed in the collection box 90 with one end aligned with the galvanizing tank 80 and the other end connected to the top of the filter box 10. This allows the flue gas generated in the galvanizing tank 80 to be collected and guided to the filter box 10, realizing the collection and transportation of flue gas and providing a basis for subsequent waste heat recovery and purification treatment.

[0030] Reference Figure 1 2. The top wall of the collection box 90 is connected to the water inlet pipe 91 and the bottom is connected to the water outlet pipe 92, which can realize the introduction of cold water and the discharge of hot water. Combined with the heat exchange tube 140 being submerged in cold water, it can transfer the heat of flue gas to the cold water, improve the reuse rate of flue gas waste heat and save energy.

[0031] Reference Figure 2 3. The top of the filter box 10 is equipped with a spray assembly 11, and the filter box 10 is equipped with a filter plate 20 that is horizontally mounted below the spray assembly 11, which can spray and purify the flue gas and filter impurities, making the discharged flue gas more environmentally friendly.

[0032] Reference Figure 2 3. The filter box 10 is equipped with a cleaning mechanism 30, which includes a drive assembly 31 and a cleaning plate 32. The drive assembly 31 is connected to the cleaning plate 32 and can drive the cleaning plate 32 to clean the filter plate 20, so as to avoid the accumulation of impurities and affect the filtration effect, and ensure that the filter plate 20 works effectively for a long time.

[0033] Reference Figure 1Specifically, in section 2, one end of the heat exchange tube 140 near the galvanizing tank 80 is connected to a collection hood via a flexible hose. The collection hood has an opening at the top of the entire galvanizing tank 80. A motor is installed on the collection box 90, and the motor is connected to the collection hood via a connecting plate. The motor is used to move the collection hood and adjust its position so that the collection hood can be moved away from the top of the galvanizing tank 80, so that products can be put into or taken out of the galvanizing tank 80. An exhaust fan is installed on the collection box 90, and the exhaust fan is connected to the heat exchange tube 140. When a negative pressure is generated in the heat exchange tube 140, the collection hood will draw in air to collect the fumes generated in the galvanizing tank 80.

[0034] Reference Figure 2 Specifically, the spray assembly 11 includes a nozzle and a liquid supply pipe. The nozzle is typically an atomizing nozzle, capable of evenly spraying the purifying agent onto the flue gas. The liquid supply pipe is connected to an external purifying agent storage device to supply the purifying agent to the nozzle. The filter plate 20 is generally a porous metal filter screen, which is horizontally mounted below the spray assembly 11 to filter impurities in the flue gas.

[0035] Reference Figure 2 In addition to filter plate 20, filter box 10 is also equipped with a purification plate 40. The purification plate 40 is located below and parallel to filter plate 20. The circumferential sidewall of the purification plate 40 is fitted and fixed to the inner wall of filter box 10. The diameter of the pores on the purification plate 40 is smaller than the diameter of the pores on filter plate 20. The purification plate 40 can further purify the flue gas filtered by filter plate 20 and the purification agent sprayed by spray assembly 11, removing smaller particulate impurities and harmful substances.

[0036] Reference Figure 1 3, wherein a recovery pipe is connected to the side wall of the filter box 10, one end of the recovery pipe is located below the purification plate 40, and the other end is connected to the purification agent storage device of the spray assembly 11, which is used to recycle the filtered purification agent and reduce resource waste.

[0037] Reference Figure 2 Filter plate 20 and purification plate 40 separate the filter box 10, forming a clean zone 12 between them. A rotating motor 21 is installed on the filter box 10, and a rotating gear is coaxially fixed to the rotating motor 21. A transmission gear is coaxially fixed to the filter plate 20, and the transmission gear meshes with the rotating gear. The rotating motor 21 can drive the filter plate 20 to rotate, causing the top and bottom surfaces of the filter plate 20 to be reversed, so that the side of the filter plate 20 and purification plate 40 with residual impurities is located in the clean zone 12. The cleaning plate 32 can move within the clean zone 12, and the top wall of the cleaning plate 32 contacts the filter plate 20, while the bottom wall of the cleaning plate 32 contacts the purification plate 40.

[0038] Reference Figure 3A cleaning box 50 is provided on one side of the filter box 10. The cleaning box 50 is connected to the cleaning zone 12. The drive assembly 31 drives the cleaning plate 32 to move in the cleaning zone 12, pushing impurities into the cleaning box 50. During this process, the upper and lower sides of the cleaning plate 32 slide against the filter plate 20 and the purification plate 40 respectively, so that both can be cleaned simultaneously. The cleaning box 50 is connected to the cleaning zone 12, which facilitates the collection of the scraped impurities into the cleaning box 50.

[0039] Reference Figure 3 Specifically, the drive assembly 31 includes a moving block 311 and a moving cylinder 312. A moving hole 13 is provided through the side wall of the filter box 10 relative to the cleaning box 50. The moving block 311 is inserted into the moving hole 13. The moving cylinder 312 is provided on the filter box 10. The output end of the moving cylinder 312 is connected to the moving block 311. The moving cylinder 312 is used to drive the moving block 311 to move in the cleaning area 12 towards or away from the cleaning box 50. The cleaning plate 32 is provided on the side of the moving block 311 near the cleaning box 50.

[0040] In the initial state, the moving block 311 is located outside the clean zone 12, and the end wall of the moving block 311 blocks the moving hole 13. At this time, the clean zone 12 is a hollow area to allow the passage of flue gas and purifying agent. After the flue gas is filtered by the filter plate 20, part of it enters the clean box 50 and is discharged. The other part of the flue gas containing impurities is heavier and falls downward after adsorbing the purifying agent. After passing through the purification plate 40, it obtains a relatively clean gas that can shuttle back and forth on both sides of the purification plate 40, thus passing under the purification plate 40 and returning to the clean zone 12, and then entering the clean box 50 for discharge. When it is necessary to clean the filter plate 20 and the purification plate 40, the filter plate 20 flips up and down, and the moving cylinder 312 is activated to drive the moving block 311 to move the cleaning plate 32 into the cleaning area 12. This allows the cleaning plate 32 to slide against the filter plate 20 and the purification plate 40, thereby scraping off the impurities on the filter plate 20 and the purification plate 40 and pushing the impurities to move into the cleaning box 50, thus cleaning the filter plate 20 and the purification plate 40 to provide long-term filtration effect.

[0041] Reference Figure 3 4. The cleaning box 50 is provided with an arc plate 51. The arc plate 51 is located on a circular trajectory with the side of the filter plate 20 close to the cleaning box 50 as the axis and the cleaning area 12 as the radius. The cross-section of the arc plate 51 is a quarter-circular structure. The bottom end of the arc plate 51 is abutted and fixed to the purification plate 40.

[0042] Reference Figure 3In addition to the 4, the arc plate 51 acts as a guide, allowing the purifying agent to flow back to the top of the purification plate 40 along its trajectory. After filtration, it is stored below the purification plate 40 for recycling, reducing resource waste. The cleaning box 50 only collects and stores impurities, facilitating their cleaning and treatment, thus improving the overall system's resource utilization efficiency and operational stability.

[0043] Reference Figure 3 A rotating assembly 60 is provided at the connection between the cleaning box 50 and the filter box 10. The rotating assembly 60 is connected to the cleaning plate 32. The rotating assembly 60 includes a rotating gear 61 and a rotating rack 62. The top of the cleaning plate 32 is rotatably connected to the moving block 311 via a rotating shaft. The rotating gear 61 is coaxially sleeved on the rotating shaft and fixed to the rotating shaft. The rotating rack 62 is horizontally set and fixed to the inner wall of the cleaning box 50. The rotating gear 61 can mesh with the rotating rack 62.

[0044] After the moving block 311 drives the cleaning plate 32 to clean the filter plate 20 and the purification plate 40, the cleaning plate 32 moves to the connection between the filter box 10 and the cleaning box 50. At this time, the moving block 311 continues to move, driving the cleaning plate 32 to gradually insert into the cleaning box 50, so that the rotating gear 61 meshes with the rotating rack 62 and slides on the rotating rack 62. This causes the rotating gear 61 to drive the rotating shaft to rotate, causing the cleaning plate 32 to push the impurities upward along the trajectory of the arc plate 51, so that the impurities move to the top opening of the cleaning box 50 for centralized cleaning.

[0045] Reference Figure 3 4. In order to facilitate the cleaning of impurities in the cleaning box 50, a collection mechanism 70 is provided in the cleaning box 50. The collection mechanism 70 is located on the top of the cleaning box 50. The collection mechanism 70 includes a sliding assembly 71 and two receiving plates 72. The sliding assembly 71 is connected to the two receiving plates 72. The two receiving plates 72 are arranged symmetrically about the central axis of the cleaning box 50. The receiving plates 72 can abut against the side of the cleaning plate 32 away from the moving block 311.

[0046] Reference Figure 34. The sliding assembly 71 includes a mounting plate 711, a sliding gear 712, and two sliding racks 713. A positioning rod 52 is fixed to the top of the cleaning box 50. A positioning hole 7111 is provided through the mounting plate 711, and the positioning rod 52 can be inserted into the positioning hole 7111. The sliding gear 712 is rotatably connected to the mounting plate 711. A motor is mounted on the mounting plate 711. The output end of the motor is coaxially fixed with the sliding gear 712 and can drive the sliding gear 712 to rotate. The sliding racks 713 are slidably connected to the mounting plate 711. The sliding gear 712 is located between the two sliding racks 713. The sliding racks 713 mesh with the sliding gear 712. The two sliding racks 713 correspond one-to-one with the receiving plates 72. The sliding racks 713 are fixed to the corresponding receiving plates 72.

[0047] Reference Figure 3 And 4, the positioning rod 52 can be inserted into the positioning hole 7111 to achieve the positioning of the mounting plate 711 on the cleaning box 50 and ensure the stability of the mounting plate 711. In the initial state, the sliding component 71 drives the two receiving plates 72 to move away from each other, so that the two receiving plates 72 are in an open state.

[0048] When the cleaning plate 32 pushes the impurities to the opening of the cleaning box 50, the cleaning plate 32 is positioned between the two receiving plates 72. At this time, the cleaning plate 32 is in a horizontal state and can abut against the receiving plates 72. Then, the motor is started, driving the sliding gear 712 to rotate, which drives the two sliding racks 713 to move relative to each other, thereby bringing the two receiving plates 72 closer together. During this process, the receiving plates 72 push and slide on the cleaning plate 32, thereby scooping up the impurities on the cleaning plate 32 and causing the impurities to fall onto the receiving plates 72. When the two receiving plates 72 abut against each other, the two receiving plates 72 are spliced ​​into a complete plate-shaped structure. At this time, all the impurities are on this plate-shaped structure. Then, the receiving plates 72 are moved upward, causing the mounting plate 711 to be pulled out from the positioning rod 52, and the receiving plates 72 are moved out of the cleaning box 50 for cleaning of impurities.

[0049] Reference Figure 3 In section 4, to facilitate the collection of impurities by the receiving plate 72, one receiving plate 72 has several through holes 721 arranged at intervals along its length, and the other receiving plate 72 has several mounting holes 722 arranged at intervals along its length. The through holes 721 and mounting holes 722 are staggered, allowing one receiving plate 72 to be inserted into a mounting hole 722 and the other receiving plate 72 to be inserted into a through hole 721, thus enabling the two receiving plates 72 to be joined together. The arrangement of the through holes 721 and mounting holes 722 increases the contact area between the receiving plate 72 and the impurities when shoveling them, thereby improving impurity collection.

[0050] The implementation principle of a waste heat recovery system for hot-dip galvanizing process in this application embodiment is as follows: During use, the product to be galvanized is placed in the galvanizing bath 80 for galvanizing. When the product generates flue gas during galvanizing, the end of the heat exchange tube 140 draws the flue gas into the heat exchange tube 140. At this time, the water inlet pipe 91 introduces cold water into the collection box 90, and the heat exchange tube 140 is submerged in the cold water, thereby transferring the heat contained in the flue gas to the cold water to heat the water. This process utilizes water to recover heat, and then the heated water is used in conjunction with the water outlet pipe 92, which improves the utilization rate of waste heat from the flue gas and saves energy.

[0051] The flue gas in the heat exchange tube 140 is finally discharged into the filter box 10. After being purified by the spray assembly 11 at the top of the filter box 10, the flue gas passes through the filter plate 20. The filter plate 20 filters the impurities in the flue gas, and the purified flue gas is discharged from the filter box 10, which is more environmentally friendly. However, the impurities in the flue gas remain on the filter plate 20. At this time, the drive assembly 31 is activated to drive the cleaning plate 32 to slide on the filter plate 20, thereby cleaning the filter plate 20 and preventing impurities from accumulating on the filter plate 20, which would affect the filtration effect of the filter plate 20 and ensure that the filtration effect of the filter plate 20 is effective for a long time.

[0052] This application also discloses a method for utilizing a waste heat recovery system from a hot-dip galvanizing process, comprising the following steps: S1. Flue gas generated in the galvanizing bath 80 is collected through heat exchange tube 140. Cold water is introduced into the collection box 90 through inlet pipe 91. At this time, heat exchange tube 140 is immersed in cold water. The high-temperature flue gas transfers heat to heat exchange tube 140, which then heats the cold water. Finally, the hot water is discharged through outlet pipe 92 for use. The cold water can be introduced from a common water source and pumped to inlet pipe 91.

[0053] S2, the flue gas in the heat exchange tube 140 is finally discharged into the filter box 10. After being initially purified by the spray assembly 11 at the top of the filter box 10, the flue gas is filtered through the filter plate 20 and the purification plate 40 in sequence for multi-stage filtration.

[0054] S3, start the drive assembly 31 to drive the cleaning plate 32 to move within the filter box 10 to scrape impurities from the surface of the filter plate 20.

[0055] S4, when the cleaning plate 32 moves to the vicinity of the cleaning box 50, the rotating assembly 60 drives the cleaning plate 32 to rotate, thereby guiding the scraped impurities to the cleaning box 50. The rotating gear 61 and rotating rack 62 of the rotating assembly 60 must be well meshed so that the cleaning plate 32 can be accurately rotated to the appropriate position.

[0056] S5, the impurities on the collection cleaning plate 32 are held by the two receiving plates 72 of the collection mechanism 70.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waste heat recovery system for a hot-dip galvanizing process, characterized in that, The system includes a galvanizing tank (80), a collection box (90), a heat exchange tube (140), and a filter box (10). The collection box (90) is located on one side of the galvanizing tank (80). An inlet pipe (91) is connected to the top wall of the collection box (90), and an outlet pipe (92) is connected to the bottom of the collection box (90). The heat exchange tube (140) is located in the collection box (90), with one end aligned with the galvanizing tank (80) to collect the flue gas generated in the galvanizing tank (80). The other end of the heat exchange tube (140) is connected to the filter box (10). The top of the filter box (10) is connected, and a spray assembly (11) is provided on the top of the filter box (10). A filter plate (20) is provided in the filter box (10). The filter plate (20) is horizontally mounted below the spray assembly (11). A cleaning mechanism (30) is provided on the filter box (10). The cleaning mechanism (30) includes a drive assembly (31) and a cleaning plate (32). The drive assembly (31) is located on the filter box (10). The drive assembly (31) is connected to the cleaning plate (32) and is used to drive the cleaning plate (32) to scrape the filter plate (20).

2. The waste heat recovery system for the hot-dip galvanizing process according to claim 1, characterized in that, The filter box (10) is provided with a purification plate (40), which is located below the filter plate (20) and parallel to the filter plate (20). The diameter of the pores on the purification plate (40) is smaller than the diameter of the pores on the filter plate (20).

3. The waste heat recovery system for the hot-dip galvanizing process according to claim 2, characterized in that, The filter plate (20) and the purification plate (40) separate the filter box (10), and a cleaning zone (12) is formed between the filter plate (20) and the purification plate (40). The filter box (10) is provided with a rotating motor (21), which is used to drive the filter plate (20) to rotate. The cleaning plate (32) can move in the cleaning zone (12), and the top wall of the cleaning plate (32) is in contact with the filter plate (20), and the bottom wall of the cleaning plate (32) is in contact with the purification plate (40). A cleaning box (50) is provided on one side of the filter box (10), and the cleaning box (50) is connected to the cleaning zone (12). The driving assembly (31) is used to drive the cleaning plate (32) to move towards or away from the cleaning box (50).

4. The waste heat recovery system for the hot-dip galvanizing process according to claim 3, characterized in that, The drive assembly (31) includes a moving block (311) and a moving cylinder (312). The filter box (10) has a moving hole (13) through it on the side wall opposite to the cleaning box (50). The moving block (311) is inserted into the moving hole (13). The moving cylinder (312) is located on the filter box (10). The output end of the moving cylinder (312) is connected to the moving block (311). The moving cylinder (312) is used to drive the moving block (311) to move closer to or further away from the cleaning box (50) in the cleaning area (12). The cleaning plate (32) is located on the side of the moving block (311) close to the cleaning box (50).

5. The waste heat recovery system for the hot-dip galvanizing process according to claim 4, characterized in that, The cleaning box (50) is provided with an arc plate (51). The arc plate (51) is located on a circular trajectory with the filter plate (20) near the cleaning box (50) as the axis and the cleaning area (12) as the radius. The cross-section of the arc plate (51) is a quarter-circular structure. The bottom end of the arc plate (51) is abutted and fixed to the purification plate (40).

6. The waste heat recovery system for the hot-dip galvanizing process according to claim 5, characterized in that, A rotating assembly (60) is provided at the connection between the cleaning box (50) and the filter box (10). The rotating assembly (60) is connected to the cleaning plate (32) and is used to drive the bottom of the cleaning plate (32) to slide on the arc plate (51). The rotating assembly (60) includes a rotating gear (61) and a rotating rack (62). The top of the cleaning plate (32) is rotatably connected to the moving block (311) through a rotating shaft. The rotating gear (61) is coaxially sleeved on the rotating shaft. The rotating gear (61) is fixed to the rotating shaft. The rotating rack (62) is horizontally set and fixed on the inner wall of the cleaning box (50). The rotating gear (61) can mesh with the rotating rack (62).

7. The waste heat recovery system for the hot-dip galvanizing process according to claim 4, characterized in that, The cleaning box (50) is provided with a collection mechanism (70), which is located at the top of the cleaning box (50) and is used to collect impurities on the cleaning plate (32). The collection mechanism (70) includes a sliding component (71) and two receiving plates (72). The sliding component (71) is located on the cleaning box (50) and is connected to the two receiving plates (72). The two receiving plates (72) are arranged symmetrically about the central axis of the cleaning box (50). The receiving plates (72) can abut against the side of the cleaning plate (32) away from the moving block (311). The sliding component (71) is used to drive the two receiving plates (72) to move closer to or further away from each other.

8. The waste heat recovery system for the hot-dip galvanizing process according to claim 7, characterized in that, The sliding assembly (71) includes a mounting plate (711), a sliding gear (712), and two sliding racks (713). A positioning rod (52) is fixed to the top of the cleaning box (50). A positioning hole (7111) is provided through the mounting plate (7111). The positioning rod (52) can be inserted into the positioning hole (7111). The sliding gear (712) is rotatably connected to the mounting plate (711). The sliding rack (713) is slidably connected to the mounting plate (711). The sliding gear (712) is located between the two sliding racks (713). The sliding racks (713) mesh with the sliding gear (712). The two sliding racks (713) correspond one-to-one with the receiving plate (72). The sliding racks (713) are fixed to the corresponding receiving plates (72).

9. The waste heat recovery system for the hot-dip galvanizing process according to claim 7, characterized in that, One of the receiving plates (72) has a plurality of insertion holes (721) through it, and the plurality of insertion holes (721) are arranged at intervals along the length direction of the receiving plate (72). The other receiving plate (72) has a plurality of mounting holes (722) through it, and the plurality of mounting holes (722) are arranged at intervals along the length direction of the receiving plate (72). The plurality of insertion holes (721) and mounting holes (722) are staggered. One of the receiving plates (72) can be inserted into the mounting holes (722) and the other receiving plate (72) can be inserted into the insertion holes (721) respectively, so that the two receiving plates (72) can be spliced ​​together.

10. A method for utilizing a waste heat recovery system of a hot-dip galvanizing process, employing the waste heat recovery system of the hot-dip galvanizing process as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. The flue gas generated in the galvanizing tank (80) is collected through the heat exchange tube (140). Cold water is introduced into the collection box (90) through the water inlet pipe (91). At this time, the heat exchange tube (140) is immersed in the cold water. The high temperature flue gas transfers heat to the heat exchange tube (140), and then the heat exchange tube (140) heats the cold water. Finally, the hot water is discharged through the water outlet pipe (92) for use. S2. The flue gas in the heat exchange tube (140) is finally discharged into the filter box (10). After the flue gas is initially purified by the spray assembly (11) at the top of the filter box (10), it is filtered through the filter plate (20) and the purification plate (40) in sequence for multi-stage filtration. S3. Start the drive assembly (31) to drive the cleaning plate (32) to move within the filter box (10) to scrape impurities from the surface of the filter plate (20); S4. When the cleaning plate (32) moves to the vicinity of the cleaning box (50), the cleaning plate (32) is driven to rotate by the rotating component (60), thereby guiding the scraped impurities to the cleaning box (50); S5. Impurities on the collection cleaning plate (32) are held by the two receiving plates (72) of the collection mechanism (70).

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