A device for recycling waste heat of a steel pipe galvanizing furnace

Abstract

The application relates to the technical field of waste heat utilization, in particular to a steel pipe galvanizing furnace waste heat recycling device, which comprises a device shell, a total water inlet tank and a total water outlet tank are arranged on the device shell, a plurality of rows of heat exchange pipes are arranged in the device shell, the plurality of rows of heat exchange pipes are arranged along the smoke flow direction in the device shell and adopt an interlaced arrangement design mode, a plurality of U-shaped pipes are arranged in the device shell, when the device is interlaced, the heat exchange pipes can increase the contact area with the smoke, and the waste heat absorption efficiency is improved; after switching to parallel arrangement, the smoke flow resistance can be reduced, meanwhile, the parallel arrangement can be efficiently coupled with the rotary motion of the heat exchange pipes, a cooperative dust removal mechanism is formed by utilizing the centrifugal field generated by rotation and the shearing force effect of the smoke flow, the smoke dust particles adhered to the surface of the heat exchange pipes are effectively promoted to separate and discharge from the device, so that the self-cleaning effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization technology, specifically to a waste heat recovery device for steel pipe galvanizing furnaces. Background Technology

[0002] The waste heat recovery device for steel pipe galvanizing furnaces achieves tiered heat utilization through multi-stage heat exchange. The economizer, as the core equipment of the waste heat furnace system, preheats the boiler feedwater to a higher temperature by recovering waste heat from the flue gas, which can improve boiler thermal efficiency and reduce exhaust heat loss. In existing economizer technology, spiral fins are often added to the outer wall of the heat exchange tubes to expand the heat exchange area in order to improve heat exchange efficiency. However, a layer of soot is easily formed on the surface of the fins. Especially when multiple rows of heat exchange tubes are arranged in a staggered design, although the heat exchange effect can be enhanced by turbulence, the complex structure will cause soot to accumulate and block the flow channel, creating a contradiction between improved heat exchange efficiency and increased risk of ash accumulation. To address this, we propose a waste heat recovery device for steel pipe galvanizing furnaces. Summary of the Invention

[0003] To address the aforementioned technical problems, this application provides a waste heat recovery device for steel pipe galvanizing furnaces, comprising a device shell, a main inlet tank and a main outlet tank, and multiple rows of heat exchange tubes arranged inside the device shell. These heat exchange tubes are arranged along the flue gas flow direction within the device shell in a staggered configuration. Multiple U-shaped tubes are arranged inside the device shell, with the ends of adjacent heat exchange tubes in each row connected sequentially via the U-shaped tubes, forming a complete water guide pipeline. The two ends of the water guide pipeline are respectively connected to the main inlet tank and the main outlet tank. A synchronization transmission component is provided inside the device shell and connected to the multiple rows of heat exchange tubes to drive their rotation and remove soot. A state switching component is also provided inside the device shell and connected to the multiple rows of heat exchange tubes to switch the staggered arrangement of the heat exchange tubes to a parallel arrangement.

[0004] In some embodiments, the synchronous rotating component includes two strip plates symmetrically fixedly connected inside the device housing. Multiple connecting pipes are fixedly connected to the strip plates, and a row of heat exchange tubes near the end of the device housing is rotatably connected to the multiple connecting pipes. Multiple strip plates 2 and 3 are alternately arranged on one side of the strip plates 1. Multiple connecting pipes are also fixedly connected to the strip plates 2 and 3. When the multiple rows of heat exchange tubes are in an alternating arrangement, the two ends of the multiple rows of heat exchange tubes with lower vertical height are rotatably connected to the connecting pipes on the strip plates 2, while the two ends of the multiple rows of heat exchange tubes with higher vertical height are rotatably connected to the connecting pipes on the strip plates 3.

[0005] The U-shaped tube is rotatably connected to the connecting tube, and one end of the heat exchange tube is fixedly connected to a toothed disc. Multiple toothed discs are rotatably connected to strip plate one, strip plate two, and strip plate three via a rotating shaft. Adjacent toothed discs on strip plate one, strip plate two, and strip plate three are meshed with each other via toothed discs.

[0006] A shaft 2 is rotatably connected to the first strip plate, and a gear disk 3 that meshes with a gear disk 1 is fixedly connected to one end of the second shaft. A drive motor is fixedly connected to the outer casing of the device, and the output shaft of the drive motor is fixedly connected to the second shaft. A linkage component is provided inside the outer casing of the device. The gear disks 1 on the multiple second and third strip plates are connected to the gear disks 1 on the first strip plate through the linkage component. Starting the drive motor drives the multiple rows of heat exchange tubes to rotate.

[0007] In some embodiments, the linkage includes a deflection plate disposed between strip plate two and strip plate three, the deflection plate being rotatably connected to the connecting pipe, and a gear disk four being rotatably connected to the deflection plate via a rotating shaft, the gear disk four engaging with gear disk one on strip plate two and strip plate three respectively.

[0008] In some embodiments, the state switching component includes a guide rod fixedly connected inside the device housing, and slide rods fixedly connected to both ends of the strip plate. A T-shaped plate is slidably connected to the slide rod, and the guide rod slides through the T-shaped plate.

[0009] A sliding plate is fixedly connected to both ends of the three strip plates. The guide rod slides through the sliding plate to guide and limit the sliding of the three strip plates. A hydraulic push rod is fixedly connected inside the housing of the device. The extended end of the hydraulic push rod is fixed to the end of one of the three strip plates located at the end of the housing of the device. Activating the hydraulic push rod drives multiple two strip plates and three strip plates to move, thereby driving two strip plates to move upward.

[0010] In some embodiments, a limiting protrusion is fixedly connected to one side of the first strip plate, and a limiting protrusion is also fixedly connected to one side of the third strip plate. When the multiple rows of heat exchange tubes are arranged in an alternating manner, the second strip plate contacts and abuts against the limiting protrusion.

[0011] In some embodiments, two sets of spiral fins are symmetrically fixedly connected to the heat exchange tube, and the spiral directions of the two sets of spiral fins are opposite.

[0012] In some embodiments, a row of heat exchange tubes located at one end of the flue gas inlet pipe of the device housing is connected to the main water outlet tank via a connecting pipe, and a row of heat exchange tubes located at one end of the flue gas outlet pipe of the device housing is connected to the main water inlet tank via a connecting pipe.

[0013] A sliding groove is provided on the outer casing of the device. One end of the connecting pipe on a row of heat exchange tubes located at one end of the exhaust pipe of the outer casing slides through the sliding groove, and a sealing plate is fixedly connected to the main water inlet tank to seal the sliding groove.

[0014] In some embodiments, an L-shaped conduit is fixedly connected to the outer casing of the device, and an L-shaped conduit is conductively connected to the main water inlet tank. One end of the L-shaped conduit is conductively connected to a sliding tube, and one end of the sliding tube is located inside the L-shaped conduit and is slidably connected to its inner wall.

[0015] In some embodiments, an L-shaped plate is fixedly connected to the T-shaped plate, a force-bearing plate is fixedly connected to one end of the slide rod, and a tension spring is fixedly connected between the force-bearing plate and the L-shaped plate. When the multiple rows of heat exchange tubes are arranged in an alternating manner, the tension spring is in a stretched state.

[0016] This invention has at least the following beneficial effects:

[0017] When the heat exchange tubes are arranged in an alternating pattern, the contact area with the flue gas is increased, improving the waste heat absorption efficiency. When switched to a parallel arrangement, the flow resistance of the flue gas is reduced. At the same time, the parallel arrangement can achieve efficient coupling with the rotational motion of the heat exchange tubes. By utilizing the centrifugal force field generated by the rotation and the shear force of the flue gas flow, a synergistic dust removal mechanism is formed, which effectively promotes the removal of dust particles attached to the surface of the heat exchange tubes and discharges them from the device, thereby achieving a self-cleaning effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 For the present invention Figure 1 Another structural diagram;

[0020] Figure 3 For the present invention Figure 2 Schematic diagram of partial cross-section;

[0021] Figure 4 For the present invention Figure 3 Schematic diagram of partial cross-section;

[0022] Figure 5 For the present invention Figure 4 Schematic diagram of partial cross-section;

[0023] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of area A in the middle;

[0024] Figure 7 For the present invention Figure 5 Schematic diagram of partial cross-section;

[0025] Figure 8For the present invention Figure 7 Schematic diagram of the structure of Zone B;

[0026] Figure 9 For the present invention Figure 6 Schematic diagram of partial cross-section;

[0027] Figure 10 For the present invention Figure 8 Another structural diagram;

[0028] Figure 11 This is a schematic diagram of the heat exchange tube structure of the present invention.

[0029] In the diagram: 1-Equipment housing; 11-Main inlet tank; 12-Main outlet tank; 2-Heat exchange tube; 3-U-shaped tube; 4-Synchronous rotating component; 5-State switching component; 41-Strip plate one; 42-Connecting pipe; 43-Strip plate two; 44-Strip plate three; 45-Gear disc one; 46-Gear disc two; 47-Shaft two; 48-Gear disc three; 49-Drive motor; 51-Linkage component; 52-Deflection plate; 53-Gear disc four; 54-Guide rod; 55-Slide rod; 56-T-shaped plate; 57-Slide plate; 58-Hydraulic push rod; 59-Limiting protrusion; 61-Helical fin; 62-Slide groove; 63-Blocking plate; 64-L-shaped conduit one; 65-L-shaped conduit two; 66-Sliding tube; 67-L-shaped plate; 68-Force plate; 69-Tension spring. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figures 1-11 The present invention provides a technical solution: a waste heat recovery device for steel pipe galvanizing furnaces, comprising a device shell 1, a main water inlet tank 11 and a main water outlet tank 12 disposed on the device shell 1, and further comprising:

[0032] Multiple rows of heat exchange tubes 2 are arranged along the flue gas flow direction inside the outer shell 1 of the device, and are arranged in a staggered manner.

[0033] Multiple U-shaped tubes 3 are used. The ends of adjacent heat exchange tubes 2 in each row of heat exchange tubes 2 are connected sequentially through U-shaped tubes 3, so that each layer of heat exchange tubes 2 is connected end to end through U-shaped tubes 3 to form a complete water guide pipeline. The two ends of the water guide pipeline are respectively connected to the main water inlet tank 11 and the main water outlet tank 12. When the multiple rows of heat exchange tubes 2 are in an interlaced state, the U-shaped tubes 3 are in an inclined state.

[0034] Synchronous rotating component 4 is installed inside the outer shell 1 of the device and connected to the multi-row heat exchange tubes 2. It is used to drive the multi-row heat exchange tubes 2 to rotate in order to remove soot. Specifically, the synchronous rotating component 4 drives the heat exchange tubes 2 inside the device to rotate and remove soot, which can keep the heat exchange tubes 2 clean, improve the heat exchange efficiency of the device, extend its service life, and ensure stable operation.

[0035] The state switching component 5 is installed inside the outer casing 1 of the device and connected to the multi-row heat exchange tubes 2. It is used to switch the staggered arrangement of the multi-row heat exchange tubes 2 to a parallel arrangement. Specifically, when the arrangement is staggered, the heat exchange tubes 2 can increase the contact area with the flue gas and improve the waste heat absorption efficiency. When switched to a parallel arrangement, the flow resistance of the flue gas can be reduced to adapt to different working conditions. At the same time, the parallel arrangement can achieve efficient coupling with the rotational motion of the heat exchange tubes 2. By utilizing the centrifugal force field generated by the rotation and the shear force of the flue gas flow, a synergistic dust removal mechanism is formed, which effectively promotes the removal and discharge of dust particles attached to the surface of the heat exchange tubes 2 from the device, so as to achieve a self-cleaning effect.

[0036] The synchronous rotating component 4 includes two strip plates 41 symmetrically fixedly connected inside the outer casing 1 of the device. Multiple connecting pipes 42 are fixedly connected to the strip plates 41, and a row of heat exchange tubes 2 near the end of the outer casing 1 is rotatably connected to the connecting pipes 42. Multiple strip plates 43 and 44 are alternately arranged on one side of the strip plates 41, and multiple connecting pipes 42 are also fixedly connected to the strip plates 43 and 44. In the case where the multiple rows of heat exchange tubes 2 are arranged in a staggered manner, to ensure the stability and rationality of the rotatable connection of each heat exchange tube 2, precise connections are made based on the difference in the vertical height of the heat exchange tubes 2. Specifically, the ends of the multiple rows of heat exchange tubes 2 with relatively lower vertical heights are rotatably connected to the connecting pipes 42 pre-set on the strip plate 43; while the ends of the multiple rows of heat exchange tubes 2 with relatively higher vertical heights are rotatably connected to the connecting pipes 42 on the strip plate 44.

[0037] The U-shaped tube 3 is rotatably connected to the connecting tube 42. Specifically, the U-shaped tube 3 is electrically connected to the heat exchange tube 2 through the connecting tube 42, and the heat exchange tube 2 has a toothed disc 45 fixedly installed at one end. Meanwhile, multiple toothed discs 46 are rotatably connected to the strip plates 41, 43, and 44 via rotating shafts. Furthermore, on the strip plates 41, 43, and 44, adjacent toothed discs 45 achieve precise meshing and transmission through the toothed discs 46.

[0038] A shaft 47 is rotatably connected to strip plate 41. One end of shaft 47 is fixedly connected to a gear disk 48 that meshes with gear disk 45 on strip plate 41. A drive motor 49 is fixedly connected to the housing 1. The output shaft of the drive motor 49 is fixedly connected to shaft 47. A linkage 51 is provided inside the housing 1. The linkage 51 includes a deflection plate 52 disposed between strip plate 43 and strip plate 44. The deflection plate 52 is rotatably connected to the connecting pipe 42. A gear disk 53 is rotatably connected to the deflection plate 52 via a rotating shaft. The gear disk 53 is respectively connected to strip plate 43 and... When the gear disk 45 on the third strip plate 44 engages, the drive motor 49 starts and drives the shaft 47 to rotate, which in turn drives the gear disk 48 to rotate, thereby driving the gear disk 45 to rotate. Then, through the cooperation of the gear disk 45 and the gear disk 46, the multiple heat exchange tubes 2 on the first strip plate 41 rotate. At the same time, the gear disk 45 on the first strip plate 41 drives the gear disk 45 on the second strip plate 43 to rotate through the gear disk 53. Then, the gear disk 45 on the second strip plate 43 drives the gear disk 45 on the third strip plate 44 to rotate through the gear disk 53, and so on, to drive the rotation of multiple rows of heat exchange tubes 2.

[0039] The state switching component 5 includes a guide rod 54 fixedly connected inside the device housing 1, and slide rods 55 fixedly connected to both ends of the strip plate 43. A T-shaped plate 56 is slidably connected to the slide rod 55, and the guide rod 54 slides through the T-shaped plate 56 to guide and limit the sliding of the strip plate 43.

[0040] Slide plates 57 are fixedly connected to both ends of strip plate 3 44. Guide rod 54 slides through slide plate 57 to guide and limit the sliding of strip plate 3 44. Hydraulic push rod 58 is fixedly connected inside device housing 1. The extended end of hydraulic push rod 58 is fixedly connected to the end of a strip plate 3 44 located at the end of device housing 1.

[0041] Specifically, when the multiple rows of heat exchange tubes 2 are arranged in an alternating manner, there is a significant difference in vertical height. Specifically, the vertical height of one row of heat exchange tubes 2 on strip plate two 43 is lower than that of the corresponding row of heat exchange tubes 2 on strip plate one 41 and strip plate three 44. Simultaneously, the U-shaped tubes 3 within the device are arranged at an angle. In this state, the hydraulic push rod 58 is activated, and its output power drives a strip plate three 44 located at the end of the device casing 1 to move. Due to the precise mechanical connections between the components, the movement of strip plate three 44 further drives the synchronous movement of multiple strip plates two 43. During this process, thanks to the special structural characteristics of the U-shaped tubes 3, strip plate two 43 moves both laterally and upwards. Furthermore, this movement process must overcome the gravity of strip plate two 43 and the heat exchange tubes 2 installed on it. Through this series of coordinated actions, the multiple rows of heat exchange tubes 2 are ultimately smoothly switched from an alternating state to a parallel state.

[0042] Strip plate 2 43 is connected to its adjacent strip plate 3 44 via U-shaped tubes 3. Initially, when the multiple rows of heat exchange tubes 2 are arranged in a staggered manner, meaning the vertical height of the heat exchange tubes 2 on strip plate 2 43 is lower than that on strip plate 3 43, the U-shaped tubes 3 are in an inclined state. Strip plate 2 43 and its adjacent strip plate 3 44 are connected via these inclined U-shaped tubes 3, which are rotatably connected to both strip plate 2 43 and strip plate 3 44. Therefore… When the hydraulic push rod 58 is activated, it will directly drive a strip plate 3 44 fixedly connected to its extended end to slide along the guide rod 54. When the strip plate 3 44 slides along the guide rod, it will move away from the adjacent strip plate 2 43. When the distance between the strip plate 3 44 and the strip plate 2 43 increases, it will pull the U-shaped tube 3 from the inclined state to the horizontal state. Thus, the deflection of the U-shaped tube 3 will drive the strip plate 2 43 to move upward, thereby switching the multi-row heat exchange tube 2 to a parallel arrangement state.

[0043] A limiting protrusion 59 is fixedly connected to one side of strip plate 41, and a limiting protrusion 59 is also fixedly connected to one side of strip plate 44. When the multiple rows of heat exchange tubes 2 are in an interlaced state, strip plate 43 and the limiting protrusion 59 come into contact and abut against each other, thereby ensuring the stability of the multiple rows of heat exchange tubes 2 in an interlaced state.

[0044] Two sets of spiral fins 61 are symmetrically fixedly connected to the heat exchange tube 2, and the spiral directions of the two sets of spiral fins 61 are opposite. This design allows a specific hydrodynamic field to be formed when the heat exchange tube 2 rotates, based on the spiral structure characteristics of the spiral fins 61 and their opposite spiral directions. This dynamic field can effectively guide the flue gas from the central region of the device shell 1 to the inner walls on both sides of the device shell 1, thereby optimizing the distribution of flue gas inside the device, significantly improving the uniformity of heat exchange, and enhancing the overall heat exchange efficiency and performance stability of the device.

[0045] A row of heat exchange tubes 2 located at one end of the flue gas inlet pipe of the device casing 1 is connected to the main water outlet tank 12 via a connecting pipe 42, and a row of heat exchange tubes 2 located at one end of the flue gas outlet pipe of the device casing 1 is connected to the main water inlet tank 11 via a connecting pipe 42.

[0046] A groove 62 is provided on the outer casing 1 of the device. One end of the connecting pipe 42 on a row of heat exchange pipes 2 located at one end of the flue pipe of the outer casing 1 slides through the groove 62. A sealing plate 63 is fixedly connected to the main water inlet tank 11 to seal the groove 62 and prevent flue gas leakage.

[0047] An L-shaped conduit 64 is fixedly connected to the outer casing 1 of the device, and an L-shaped conduit 65 is conductively connected to the main water inlet tank 11. One end of the L-shaped conduit 65 is conductively connected to a sliding tube 66. One end of the sliding tube 66 is located inside the L-shaped conduit 64 and is slidably connected to its inner wall. This design provides a flexible and variable connection structure for the water flow channel inside the device to adapt to the state switching of multiple rows of heat exchange tubes 2, which helps to ensure the stability and reliability of water flow transmission.

[0048] An L-shaped plate 67 is fixedly connected to the T-shaped plate 56. A force-bearing plate 68 is fixedly connected to one end of the slide rod 55. A tension spring 69 is fixedly connected between the force-bearing plate 68 and the L-shaped plate 67. Specifically, when the multiple rows of heat exchange tubes 2 are arranged in an alternating manner, the tension spring 69 is stretched and in a stored state. At this time, if the hydraulic push rod 58 is activated, the hydraulic push rod 58 will drive the strip plate 43 to move upward. At the same time, the tension spring 69, which is in a stretched and stored state, begins to reset, and then pushes the slide rod 55 through the force-bearing plate 68. Thus, the tension spring 69 and the hydraulic push rod 58 work together to lift the heat exchange tubes 3, which initially have a lower vertical height, upward. Finally, the multiple rows of heat exchange tubes 3 are adjusted to a parallel state.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A waste heat recovery device for steel pipe galvanizing furnaces, comprising a device shell (1), wherein a main water inlet tank (11) and a main water outlet tank (12) are provided on the device shell (1), characterized in that, It also includes: Multi-row heat exchange tubes (2) are arranged along the flue gas flow direction inside the outer shell (1) of the device and are arranged in an alternating manner. Multiple U-shaped tubes (3) are used to connect the ends of adjacent heat exchange tubes (2) in each row of heat exchange tubes (2) in sequence through the U-shaped tubes (3), so that each layer of heat exchange tubes (2) is connected end to end through the U-shaped tubes (3) to form a complete water guide pipeline. The two ends of the water guide pipeline are respectively connected to the main water inlet tank (11) and the main water outlet tank (12). Synchronous rotating component (4) is installed inside the outer shell (1) of the device and connected to the multi-row heat exchange tubes (2) to drive the multi-row heat exchange tubes (2) to rotate so as to remove soot; A state switching component (5) is installed inside the device housing (1) and connected to the multi-row heat exchange tubes (2) for switching the staggered multi-row heat exchange tubes (2) to a parallel arrangement; The synchronous rotating component (4) includes two strip plates (41) symmetrically fixedly connected inside the device housing (1). Multiple connecting pipes (42) are fixedly connected to the strip plate (41), and a row of heat exchange pipes (2) near the end of the device housing (1) is rotatably connected to the multiple connecting pipes (42). Multiple strip plates (43) and strip plates (44) are alternately arranged on one side of the strip plate (41). The state switching component (5) includes a guide rod (54) fixedly connected inside the device housing (1), and slide rods (55) fixedly connected to both ends of the strip plate (43). A T-shaped plate (56) is slidably connected to the slide rod (55), and the guide rod (54) slides through the T-shaped plate (56). A sliding plate (57) is fixedly connected to both ends of the strip plate three (44). The guide rod (54) slides through the sliding plate (57) to guide and limit the sliding of the strip plate three (44). A hydraulic push rod (58) is fixedly connected inside the device housing (1). The extended end of the hydraulic push rod (58) is fixed to the end of one of the strip plates three (44) located at the end of the device housing (1). The hydraulic push rod (58) is activated to drive multiple strip plates two (43) and strip plates three (44) to move, so as to drive strip plates two (43) to move upward.

2. The waste heat recovery device for steel pipe galvanizing furnaces according to claim 1, characterized in that: Multiple connecting pipes (42) are also fixedly connected to the second strip plate (43) and the third strip plate (44). When the multiple rows of heat exchange tubes (2) are arranged in an alternating manner, the two ends of the multiple rows of heat exchange tubes (2) with lower vertical height are rotatably connected to the connecting pipes (42) on the second strip plate (43), while the two ends of the multiple rows of heat exchange tubes (2) with higher vertical height are rotatably connected to the connecting pipes (42) on the third strip plate (44). The U-shaped tube (3) is rotatably connected to the connecting tube (42), and one end of the heat exchange tube (2) is fixedly connected to a toothed disc (45). Multiple toothed discs (46) are rotatably connected to the strip plate (41), strip plate (43), and strip plate (44) through a rotating shaft. The adjacent toothed discs (45) on the strip plate (41), strip plate (43), and strip plate (44) are all meshed through toothed discs (46). A shaft 2 (47) is rotatably connected to the first strip plate (41). One end of the shaft 2 (47) is fixedly connected to a third gear (48) that meshes with the first gear (45). A drive motor (49) is fixedly connected to the outer casing (1) of the device. The output shaft of the drive motor (49) is fixedly connected to the second shaft (47). A linkage (51) is provided inside the outer casing (1) of the device. The first gear (45) on the second strip plate (43) and the third strip plate (44) is connected to the first gear (45) on the first strip plate (41) through the linkage (51). The drive motor (49) is started to drive the multiple rows of heat exchange tubes (2) to rotate.

3. The waste heat recovery device for steel pipe galvanizing furnace according to claim 2, characterized in that: The linkage component (51) includes a deflection plate (52) disposed between the second strip plate (43) and the third strip plate (44). The deflection plate (52) is rotatably connected to the connecting pipe (42), and a gear plate (53) is rotatably connected to the deflection plate (52) via a rotating shaft. The gear plate (53) meshes with the gear plate (45) on the second strip plate (43) and the third strip plate (44) respectively.

4. The waste heat recovery device for steel pipe galvanizing furnace according to claim 3, characterized in that: A limiting protrusion (59) is fixedly connected to one side of the first strip plate (41), and a limiting protrusion (59) is also fixedly connected to one side of the third strip plate (44). When the multiple rows of heat exchange tubes (2) are arranged in an alternating manner, the second strip plate (43) contacts and abuts against the limiting protrusion (59).

5. The waste heat recovery device for steel pipe galvanizing furnace according to claim 4, characterized in that: Two sets of spiral fins (61) are symmetrically fixedly connected to the heat exchange tube (2), and the spiral directions of the two sets of spiral fins (61) are opposite.

6. The waste heat recovery device for steel pipe galvanizing furnace according to claim 5, characterized in that: A row of heat exchange tubes (2) located at one end of the flue gas inlet pipe of the device casing (1) is connected to the main water outlet tank (12) via a connecting pipe (42), and a row of heat exchange tubes (2) located at one end of the flue gas outlet pipe of the device casing (1) is connected to the main water inlet tank (11) via a connecting pipe (42). A groove (62) is provided on the outer shell (1) of the device. One end of the connecting pipe (42) on a row of heat exchange pipes (2) located at one end of the exhaust pipe of the outer shell (1) slides through the groove (62). A sealing plate (63) is fixedly connected to the main water tank (11) to seal the groove (62).

7. The waste heat recovery device for steel pipe galvanizing furnaces according to claim 6, characterized in that: An L-shaped conduit 1 (64) is fixedly connected to the outer shell (1) of the device, and an L-shaped conduit 2 (65) is conductively connected to the main water inlet tank (11). One end of the L-shaped conduit 2 (65) is conductively connected to a sliding tube (66), and one end of the sliding tube (66) is located inside the L-shaped conduit 1 (64) and is slidably connected to its inner wall.

8. The waste heat recovery device for steel pipe galvanizing furnace according to claim 7, characterized in that: An L-shaped plate (67) is fixedly connected to the T-shaped plate (56), and a force-bearing plate (68) is fixedly connected to one end of the slide rod (55). A tension spring (69) is fixedly connected between the force-bearing plate (68) and the L-shaped plate (67). When the multiple rows of heat exchange tubes (2) are arranged in an alternating manner, the tension spring (69) is in a stretched state.

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