Waste heat recovery device of galvanized sheet production line

Abstract

The invention discloses a waste heat recovery device of a galvanized sheet production line, and relates to the technical field of waste heat recovery of galvanized sheet production lines. The waste heat recovery device of the galvanized sheet production line comprises a shell, and tube plates are fixedly installed at the two ends of the shell respectively; the tube bundle is arranged between the tube plates on the two sides in a penetrating mode and is composed of a plurality of heat exchange tubes which are evenly distributed. The spoilers are uniformly arranged in the heat exchange tubes in the axial direction, and the spoilers can reciprocate in the axial direction of the heat exchange tubes and drive the corresponding heat exchange tubes to rotate around the axes of the corresponding heat exchange tubes, so that tube pass fluid is subjected to superposition circumferential disturbance on the basis of axial flow, and a reciprocating spiral dynamic flow field is formed. By arranging the spoilers which are uniformly distributed in the axial direction in the heat exchange tube, on one hand, tube pass fluid is disturbed, turbulent flow is enhanced, on the other hand, dirt or sediment possibly attached to the inner wall is scraped, scaling is effectively restrained, the uniformity of flow velocity distribution is improved, heat transfer in the tube is remarkably enhanced, and local overheating or a heat transfer dead zone is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste heat recovery of galvanized sheet production line, in particular to a waste heat recovery device of galvanized sheet production line. BACKGROUND

[0002] In the zinc sheet production line, a large amount of high-temperature waste heat is generated when the annealing furnace, zinc pot and combustion system are running, among which the temperature of the annealing furnace flue gas is high, and the surface radiation heat loss of the zinc pot accounts for a large proportion in the total energy consumption. If such waste heat is directly discharged, not only the energy utilization rate is low, but also the carbon emission intensity is significantly increased. Therefore, a tubular heat exchanger is often used to convert the waste heat generated in the industrial production process into reusable energy.

[0003] However, the current tubular heat exchanger still has the following problems in the working process: 1. In the traditional tubular waste heat recovery device, the inner wall of the heat exchange tube is in long-term contact with the fluid, which is easy to adhere to dirt or deposits. However, the heat exchange tube is in a static flow field, which lacks effective disturbance, resulting in continuous accumulation of dirt, and in severe cases, it may cause pipe blockage. At the same time, the static arrangement makes the heat transfer in the heat exchange tube unevenly distributed, and local areas are prone to overheating or heat transfer dead zones, which not only reduces the heat exchange efficiency, but also may induce thermal stress damage to the pipe material.

[0004] 2. The high-temperature flue gas discharged from the annealing furnace contains a large amount of zinc vapor. When it enters the heat exchanger, the zinc vapor rapidly condenses into fine zinc oxide particles as the temperature drops, which is easy to deposit on the outer wall of the heat exchange tube and the gap between the tube bundles, causing channel blockage. At the same time, under the traditional baffle structure, the flow path of the shell-side flue gas is single, and there is obvious uneven flow field distribution and flow dead zone in the tube bundle area. The thermal boundary layer is thick and stable, and the laminar flow trend is significant, which seriously weakens the convective heat transfer capacity between the flue gas and the tube wall, resulting in low overall heat exchange efficiency and difficulty in meeting the demand for efficient waste heat recovery. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a waste heat recovery device of galvanized sheet production line, which solves the problems raised in the background art.

[0006] To achieve the above object, the application is implemented by the following technical solutions: A waste heat recovery device of a galvanized sheet production line, comprising: a shell, both ends of the shell are fixedly provided with tube sheets; a tube bundle, the tube bundle is arranged between the two tube sheets and is composed of a plurality of uniformly arranged heat exchange tubes; a spoiler, the heat exchange tube is internally provided with spoilers uniformly arranged along the axial direction, the spoilers can reciprocate along the axial direction of the heat exchange tube and drive the corresponding heat exchange tube to rotate around its own axis, so that the tube-side fluid is superimposed with circumferential disturbance on the basis of axial flow, forming a reciprocating spiral dynamic flow field; a spiral flow guide assembly, the spiral flow guide assembly is arranged in the shell-side space between adjacent layers of heat exchange tubes and can reciprocate around the tube bundle in the circumferential direction to periodically disturb the shell-side flow field and destroy the thermal boundary layer of the outer wall of the heat exchange tube.

[0007] Further, the spiral flow guide assembly comprises a spiral flow guide rod, the spiral flow guide rod extends spirally around the plurality of heat exchange tubes in the same layer, and one spiral flow guide rod is correspondingly arranged on the outer periphery of each layer of tube bundles.

[0008] Further, the spiral flow guide assembly comprises a plurality of spiral flow guide rods, the plurality of spiral flow guide rods are arranged at intervals along the axial direction of the tube bundle and are arranged in a gradient from dense to sparse from the inlet end to the outlet end of the shell-side medium.

[0009] Further, the spiral flow guide rods of adjacent layers have opposite spiral directions, and in the reciprocating swinging process, the swinging directions of the spiral flow guide rods of adjacent layers are opposite to each other, so as to form an opposite disturbance flow field with staggered phases in the shell-side.

[0010] Further, a plurality of rolling balls are uniformly distributed along the spiral line direction of the spiral flow guide rod and are rolling installed on the spiral flow guide rod, the rolling balls are in rolling contact with the outer wall of the adjacent heat exchange tube.

[0011] Further, a flow guide groove extending along the spiral line direction of the spiral flow guide rod is formed on the outer surface of the spiral flow guide rod, which is used to form a local acceleration channel and a pressure gradient change when the shell-side flue gas flows.

[0012] Further, the left and right ends of the spiral flow guide rods in the same layer are respectively fixedly provided with connecting rings, the right end of the connecting ring on the right side is coaxially fixedly provided with a gear ring, the gear ring is rotationally connected with the tube sheet on the corresponding side, the gear rings of adjacent layers are meshed with a transmission gear, the transmission gear is rotationally installed on the corresponding tube sheet, the gear ring on the outermost side is meshed with a driving gear on the outside, and the driving gear is connected with the output shaft of the motor.

[0013] Further, the spoiler comprises a plurality of arc-shaped plates uniformly distributed along the axial direction of the heat exchange tube, a plurality of arc-shaped plates are fixedly installed on a spiral column, and a spiral groove is formed on the inner wall of the heat exchange tube and is in sliding cooperation with the spiral column.

[0014] Furthermore, multiple baffles within the same heat exchange tube are fixedly mounted on the same moving rod. The moving rod is slidably mounted between the support rings on the left and right sides. The support rings are rotatably mounted on the inner wall of the heat exchange tube. The right end of the moving rod is fixedly connected to the moving frame. A push frame is mounted on the right side of the moving frame, and the push frame is connected to the telescopic end of the electric push rod.

[0015] Furthermore, multiple turbulence rotors are rotatably mounted on the left and right sides of the arc-shaped plate, and each turbulence rotor is evenly distributed along the circumference of the arc-shaped plate; a guide rotor is rotatably mounted on the left end of the moving rod.

[0016] The present invention has the following beneficial effects: (1) The waste heat recovery device of the galvanized sheet production line, by setting up axially uniformly distributed baffles in the heat exchange tube, on the one hand, disturbs the tube fluid and enhances turbulence, and on the other hand, scrapes off the dirt or deposits that may adhere to the inner wall, effectively inhibiting scaling. At the same time, the reciprocating axial movement of the baffles can drive the heat exchange tube to rotate back and forth around its own axis, so that the tube medium is superimposed on the circumferential flow on the basis of the axial mainstream, forming a dynamic spiral flow field, which not only improves the uniformity of the flow velocity distribution, but also significantly enhances the heat transfer in the tube, avoiding local overheating or heat transfer dead zones.

[0017] (2) The waste heat recovery device of the galvanized sheet production line applies a spiral flow guide component that can swing back and forth in the shell space between adjacent heat exchange tubes to apply a spiral disturbance to the flue gas flow field, effectively destroying the thermal boundary layer on the outer wall of the heat exchange tube, significantly enhancing the convective heat transfer between the flue gas and the tube wall. At the same time, its swinging effect promotes the high temperature flue gas to more uniformly and fully flush the tube bundle gap, avoids the formation of local low-speed zones, thereby inhibiting the condensation of zinc vapor and the deposition of zinc oxide particles. This not only improves the flow uniformity of the shell flow field, but also greatly improves the overall heat exchange efficiency.

[0018] (3) The waste heat recovery device of the galvanized sheet production line has the spiral guide rods of adjacent layers having opposite spiral directions. During the reciprocating swing, the spiral guide rods of adjacent layers swing in opposite directions to form a phase-interlaced reverse turbulence field in the shell side, effectively breaking the laminar flow tendency of flue gas flow, enhancing interlayer mixing, avoiding the concentrated deposition of heat and zinc vapor in local areas, and further improving heat exchange uniformity and anti-clogging performance.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of a half-section of the shell and end cap in this invention; Figure 3This is a partial cross-sectional view of the heat exchange tube in this invention; Figure 4 This is a partial structural diagram of the spiral column, arc plate, and moving rod in this invention; Figure 5 This is a partial cross-sectional view of the right end cap in this invention; Figure 6 This is a schematic diagram of the tube bundle and helical guide rod in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the spiral flow guide assembly in Embodiment 1 of the present invention; Figure 8 This is a partial structural diagram of the spiral guide rod, ball bearings, and guide groove in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the structure of the gear ring, transmission gear and drive gear in this invention; Figure 10 This is a schematic diagram of the tube bundle and spiral flow guide assembly in Embodiment 2 of the present invention; Figure 11 This is a schematic diagram of the spiral guide rod and connecting ring in Embodiment 2 of the present invention.

[0021] In the diagram, 1. Shell; 11. Helical guide rod; 111. Ball bearing; 112. Guide groove; 113. Connecting ring; 114. Gear ring; 115. Transmission gear; 116. Drive gear; 117. Motor; 2. Tube sheet; 3. Tube bundle; 31. Heat exchange tube; 32. Baffle plate; 321. Arc plate; 322. Helical column; 323. Helical groove; 324. Baffle rotor; 325. Moving rod; 326. Support ring; 327. Moving frame; 328. Push frame; 329. Electric push rod; 330. Guide rotor; 4. End cap; 41. Baffle plate; 5. Deflector plate; 6. Tube-side inlet; 7. Tube-side outlet; 8. Shell-side inlet; 9. Shell-side outlet. Detailed Implementation

[0022] 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.

[0023] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0024] The following is based on Figures 1-11 This invention describes a waste heat recovery device for a galvanized sheet production line provided by an embodiment of the present invention.

[0025] Example 1, please refer to this example. Figures 1-9 .

[0026] Please refer to Figure 1 and Figure 2 The waste heat recovery device of the galvanized sheet production line includes a shell 1, tube sheets 2, tube bundles 3, end caps 4, and baffles 5. The shell 1 is a horizontal cylindrical body, with tube sheets 2 fixedly installed at its left and right ends respectively. Multiple heat exchange tubes 31 are inserted between the two tube sheets 2 and evenly arranged to form the tube bundle 3, which serves as the core area for heat exchange between the tube side and the shell side. The tube sheets 2 not only support the heat exchange tubes 31 but also play a sealing and isolation role, ensuring that the tube side medium and the shell side flue gas do not mix. End caps are sealed at both ends of the shell 1. 4. A closed shell-side space is formed, wherein the left end cover 4 is provided with a tube-side inlet 6 and a tube-side outlet 7 for the tube-side medium. The left end cover 4 is provided with a baffle 41 inside to separate the inlet and outlet, so that the tube-side medium flows through the heat exchange tubes 31 in sequence to complete the heat exchange cycle. The shell-side flue gas enters from the shell-side inlet 8 at the top of the shell 1 on one side of the shell 1. Under the guidance of multiple cross-arranged baffles 5 inside the shell 1, it flows tortuously along the outer wall of the heat exchange tubes 31 and finally exits from the shell-side outlet 9 at the bottom of the other side of the shell 1.

[0027] Furthermore, the tube-side inlet 6, tube-side outlet 7, shell-side inlet 8, and shell-side outlet 9 on the end cap 4 and shell 1 are connected to external equipment via pipes. The tube-side inlet 6 is connected to a low-temperature process medium source, such as a water supply system, a heat transfer oil circulation pump, or a blower. The tube-side outlet 7 is connected to the heat-using process. The shell-side inlet 8 is connected to the flue gas exhaust port of the galvanizing annealing furnace, and the shell-side outlet 9 is connected to the subsequent flue gas treatment or venting system. The low-temperature process medium to be heated, such as water, heat transfer oil, or air, flows in the tube side, which is used to absorb the waste heat carried by the high-temperature flue gas in the shell side and transfer the recovered heat energy to the subsequent process. The high-temperature flue gas from the galvanizing annealing furnace flows in the shell side. When the flue gas flows through the outer wall of the heat exchange tube 31, it transfers heat to the tube-side medium. After its own temperature decreases, it is discharged from the shell-side outlet 9, thereby achieving efficient waste heat recovery.

[0028] Please refer to Figure 3In order to enhance the turbulence of the medium in the tube and suppress fouling on the inner wall of the heat exchange tube 31, a baffle plate 32 is uniformly arranged along the axial direction inside the heat exchange tube 31. The baffle plate 32 can move back and forth along the axial direction of the heat exchange tube 31 and drive the corresponding heat exchange tube 31 to rotate around its own axis. This causes the tube fluid to be superimposed with circumferential disturbance on the basis of axial flow, forming a reciprocating spiral dynamic flow field, which effectively destroys the boundary layer, improves heat transfer efficiency and reduces fouling.

[0029] For details, please refer to Figure 3 and Figure 4 The baffle 32 includes multiple arc-shaped plates 321 evenly distributed along the axial direction of the heat exchange tube 31. The outer edge of the arc-shaped plates 321 maintains sliding contact with the inner wall of the heat exchange tube 31. During the axial reciprocating movement, the arc-shaped plates 321 disturb the tube-side fluid on the one hand, enhancing turbulence, and on the other hand, scrape off dirt or deposits that may adhere to the inner wall, effectively inhibiting scaling. Multiple arc-shaped plates 321 are fixedly installed on a spiral column 322. The inner wall of the heat exchange tube 31 is provided with a spiral groove 323 that slides with the spiral column 322. When the spiral column 322 moves axially, the axial motion is converted into torque through the spiral pair between the spiral column 322 and the spiral groove 323, driving the heat exchange tube 31 to rotate around its own axis. This rotational motion causes the tube-side medium to superimpose circumferential flow on the basis of the axial mainstream, forming a dynamic spiral flow field, which not only improves the uniformity of the flow velocity distribution, but also significantly enhances the heat transfer inside the tube, avoiding local overheating or heat transfer dead zones.

[0030] It should be noted that the heat exchange tube 31 is connected to the tube sheets 2 at both ends by a rotating sealing structure, which ensures strict isolation between the tube side and the shell side medium while allowing the heat exchange tube 31 to rotate freely, thus balancing sealing performance and motion reliability.

[0031] Please refer to Figure 4 To further enhance the disturbance intensity of the medium inside the heat exchange tube 31, multiple turbulence rotors 324 are rotatably installed on the left and right sides of the arc plate 321. Each turbulence rotor 324 is evenly distributed along the circumference of the arc plate 321. When the arc plate 321 moves back and forth along the axial direction of the heat exchange tube 31, the tube-side medium flows through the surface of the turbulence rotor 324, driving it to passively rotate around its own axis, forming a local micro-vortex flow field. This dynamic disturbance not only enhances the mixing degree of the fluid in the near-wall region, but also effectively destroys the thermal boundary layer, further improving the heat transfer efficiency, and assisting in the removal of small deposits on the tube wall, thus strengthening the overall self-cleaning capability.

[0032] Please refer to Figure 3 - Figure 5To achieve the axial reciprocating motion of the baffle 32 and drive the heat exchange tube 31 to rotate, multiple baffles 32 within the same heat exchange tube 31 are fixedly installed on the same moving rod 325. The moving rod 325 is slidably supported inside the heat exchange tube 31 by the support rings 326 on the left and right sides. The support rings 326 are rotatably installed on the inner wall of the heat exchange tube 31, which not only provides stable guidance for the moving rod 325, but also allows the heat exchange tube 31 to rotate freely around its own axis. The right end of the moving rod 325 is fixedly connected to the moving frame 327. A push frame 328 is installed on the right side of the moving frame 327. The push frame 328 is connected to the telescopic end of the electric push rod 329. The electric push rod 329 is installed on the outside of the right end cover 4 through the support.

[0033] During operation, the electric push rod 329 actuates, driving the push frame 328 and the moving frame 327 to reciprocate axially. This, in turn, synchronously drives multiple moving rods 325 and their baffles 32 (including arc-shaped plates 321 and spiral columns 322) to reciprocate axially within the heat exchange tube 31. During this process, the spiral column 322 maintains a sliding fit with the spiral groove 323 on the inner wall of the heat exchange tube 31. As the spiral column 322 moves axially, the spiral surfaces between it and the spiral groove 323 interact, continuously converting the axial motion into a rotational driving force around the axis of the heat exchange tube 31. This causes the heat exchange tube 31 to reciprocate synchronously, ensuring coordinated movement between the moving rods 325, the baffles 32, and the heat exchange tube 31, thus achieving the linkage between the dynamic disturbance of the fluid inside the tube and the rotation of the tube.

[0034] And, please refer to Figure 3 and Figure 4 Furthermore, a flow guide rotor 330 is rotatably installed at the left end of the moving rod 325, located in the inlet area of ​​the heat exchange tube 31. Before the tube-side medium enters the heat exchange tube 31 through the tube-side inlet 6, it first flows through the flow guide rotor 330. Under the action of the fluid, the flow guide rotor 330 can passively rotate, and its spiral surface guides the axial flow into a pre-swirling flow with circumferential direction. This pre-swirling not only plays a preliminary role in disturbing and rectifying the inlet flow field, weakening the influence of eccentricity or uneven vortex of the incoming flow, but also moderately accelerates the fluid in a local area, making the medium more uniform and stable in the cross section of the heat exchange tube 31, effectively reducing the dead zone of the inlet flow and the phenomenon of wall stagnation. As a result, the heat transfer intensity and response speed in the initial heat exchange area are significantly improved, laying a good flow field foundation for subsequent dynamic disturbance and rotation-enhanced heat transfer.

[0035] In addition, please refer to Figure 6To enhance the uniformity of flue gas flow within the shell side and improve overall heat transfer efficiency, a spiral flow guide assembly is installed in the shell-side space between adjacent heat exchange tubes 31. The spiral flow guide assembly can oscillate back and forth around the tube bundle 3. During the oscillation, the spiral flow guide assembly applies periodic and alternating disturbances to the high-temperature flue gas in the shell side, effectively breaking the thermal boundary layer formed on the outer wall of the heat exchange tube 31, significantly enhancing the convective heat transfer between the flue gas and the tube wall. At the same time, its dynamic disturbance effect promotes the flue gas to penetrate the gap of the tube bundle 3 more fully and uniformly, avoiding the condensation of zinc vapor and the deposition of zinc oxide particles caused by excessively low local flow velocity in the traditional static structure. This not only improves the heat transfer intensity on the shell side but also improves the temperature field distribution in the tube bundle 3 region.

[0036] For details, please refer to Figure 6 - Figure 8 The spiral flow guiding assembly includes a spiral flow guiding rod 11, which extends spirally around multiple heat exchange tubes 31 in the same layer. Each tube bundle 3 has a corresponding spiral flow guiding rod 11 on its outer periphery. During operation, the spiral flow guiding rod 11 swings circumferentially around the center of the corresponding tube bundle 3, guiding the shell-side flue gas to form an alternating reverse spiral flow path between the tubes. This effectively alleviates the flow dead zone and local short circuit problems that are easily caused by the traditional baffle plate 5 structure. At the same time, its dynamic swing can periodically change the flue gas scouring angle, making the heating and cleaning of the outer surface of the heat exchange tube 31 more uniform.

[0037] Furthermore, the spiral guide rods 11 of adjacent layers have opposite spiral directions, and during the reciprocating oscillation process, the oscillation directions of the spiral guide rods 11 of adjacent layers are opposite to each other. This forms a reverse turbulence field with staggered phases and alternating directions in the shell-side space, effectively breaking the laminar flow tendency that is easily formed when the flue gas flows along the tube bundle 3, and significantly enhancing the lateral mixing and momentum exchange between adjacent tube layers. This not only makes the heat and zinc vapor distribution more uniform and avoids its enrichment and condensation in local areas, but also further improves the scouring intensity of the outer surface of the heat exchange tube 31. Thus, while improving the overall heat transfer uniformity, it significantly enhances the anti-clogging performance and long-term operational reliability of the device against high zinc content flue gas.

[0038] It should be noted that the spiral guide rod 11 is inserted into the gap between each baffle plate 5, and its swing trajectory does not interfere with the baffle plate 5 in space, ensuring that the spiral guide rod 11 can swing freely back and forth without obstruction.

[0039] Please refer to Figure 7 and Figure 8Roller balls 111, evenly distributed along the spiral direction, are rolled on the spiral guide rod 11. The roller balls 111 roll in contact with the outer wall of the adjacent heat exchange tube 31. When the spiral guide rod 11 swings and the heat exchange tube 31 rotates synchronously, the roller balls 111 generate micro-rolling under the relative motion of the two, causing the heat exchange tube 31 to generate micro-vibration. This micro-vibration can effectively weaken the adhesion strength of zinc oxide particles or zinc ash on the outer wall of the tube and inhibit the formation of the deposit layer. On the other hand, through the dynamic response of the tube wall, it promotes the disturbance coupling between the shell-side flue gas and the tube-side medium in the radial direction, and enhances the heat and mass exchange across the wall. Thus, it not only improves the uniformity of velocity and temperature distribution of the fluid inside and outside the tube, but also enhances the stability of the overall heat exchange process.

[0040] In addition, a guide groove 112 extending along its spiral direction is provided on the outer surface of the spiral guide rod 11. The guide groove 112 swings back and forth synchronously with the spiral guide rod 11. When the flue gas flows through the shell side, the channel structure of the guide groove 112 forms a local acceleration channel and generates a dynamic pressure gradient between the groove opening and the tube wall, inducing the flue gas to generate micro-scale vortices in the inter-tube region, significantly enhancing the lateral diffusion capacity and turbulent mixing intensity of the flue gas. As a result, it not only effectively improves the uniformity of the velocity distribution of the flue gas on the cross section of the tube bundle 3, but also strengthens the convective heat transfer between the heat exchange tubes 31, making the overall heat load distribution more balanced and further improving the waste heat recovery efficiency.

[0041] Please refer to Figure 7 - Figure 9 To achieve synchronous reciprocating swing of the spiral guide rods 11 in different layers, connecting rings 113 are fixedly installed at the left and right ends of the spiral guide rods 11 in the same layer. A toothed ring 114 is coaxially fixedly installed at the right end of the connecting ring 113 on the right side. The toothed ring 114 is rotatably connected to the tube plate 2 on the corresponding side. A transmission gear 115 meshes between the toothed rings 114 in adjacent layers. The transmission gear 115 is rotatably installed on the corresponding tube plate 2. A drive gear 116 meshes on the outermost toothed ring 114. The drive gear 116 is connected to the output shaft of the motor 117. The motor 117 is fixedly installed on the outside of the housing 1.

[0042] During operation, the motor 117 drives the drive gear 116 to reciprocate, causing the outermost toothed ring 114 to move synchronously. The motion is then transmitted to the inner toothed ring 114 through the transmission gears 115. Since adjacent toothed rings 114 mesh with the intermediate transmission gear 115 and rotate in opposite directions, they drive the connecting rings 113 and the corresponding spiral guide rods 11 to swing synchronously in opposite directions. It should be noted that the drive gear 116 is fitted with a sealed protective shell connected to the housing 1. Without hindering the transmission of the drive gear 116, it effectively isolates the leakage of flue gas from the housing side, ensuring the overall sealing reliability of the device.

[0043] In actual operation (use), the tube-side medium enters the heat exchange tube 31 through the tube-side inlet 6 on the left end cap 4, flows through the inside of the tube bundle 3, reaches the chamber of the right end cap 4, and is then guided by the partition 41 to flow out through the tube-side outlet 7. During this process, the electric push rod 329 is activated, pushing the push frame 328 to move axially back and forth, driving the moving frame 327 and multiple moving rods 325 to move synchronously, thereby driving the baffle plate 32 fixed on it to slide back and forth inside the heat exchange tube 31. Since the baffle plate 32 cooperates with the spiral groove 323 on the inner wall of the heat exchange tube 31 through the spiral column 322, this axial movement is converted into torque, causing the heat exchange tube 31 to rotate around its own axis, thereby forming a dynamic spiral disturbance on the tube-side fluid, enhancing heat transfer and Scaling on the inner wall is inhibited; at the same time, the high-temperature flue gas from the galvanizing annealing furnace enters the inner cavity of the shell 1 through the shell-side inlet 8 and flows in the gap of the tube bundle 3. The drive motor 117 starts and drives the drive gear 116 to rotate. The drive gear 116 meshes with the outermost toothed ring 114 and transmits the motion layer by layer to the adjacent toothed rings 114 through the transmission gears 115 of each level. Since the adjacent toothed rings 114 are meshed through the intermediate transmission gear 115, their rotation directions are opposite, thereby driving the connecting rings 113 of each layer and the corresponding spiral guide rods 11 to swing synchronously in opposite directions around the corresponding tube bundle 3, applying periodic and phase-interlaced spiral disturbances to the shell-side flue gas, effectively destroying the thermal boundary layer on the outer wall of the heat exchange tube 31 and improving the heat transfer uniformity on the shell side.

[0044] Example 2, please refer to this example. Figure 10 and Figure 11 .

[0045] The difference between this embodiment and Embodiment 1 is that the spiral guide assembly here includes multiple spiral guide rods 11, which are arranged at intervals along the axial direction of the tube bundle 3 and are arranged in a gradient from dense to sparse distribution from the inlet end of the shell-side medium to the outlet end.

[0046] During operation, each spiral guide rod 11 reciprocates synchronously. In the high-temperature, high-velocity region near the shell-side inlet 8, the spiral guide rods 11 are densely arranged, which can significantly enhance the disturbance intensity of the flue gas in the initial section and improve the heat transfer efficiency in this region. In the shell-side outlet 9 region where the temperature and velocity gradually decrease along the flow path, the spacing between the spiral guide rods 11 gradually increases. This not only retains the necessary flow field disturbance to maintain heat transfer performance, but also effectively reduces the flow resistance of the flue gas, avoiding premature condensation and precipitation of zinc vapor in the later section due to excessive cooling or a sudden drop in velocity.

[0047] 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.

[0048] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A waste heat recovery device for a galvanized sheet production line, characterized in that, include: The housing (1) has tube sheets (2) fixedly installed at both ends of the housing (1); Tube bundle (3), the tube bundle (3) is inserted between the tube sheets (2) on both sides and is composed of multiple heat exchange tubes (31) evenly arranged; The heat exchange tube (31) is provided with a baffle plate (32) evenly arranged along the axial direction. The baffle plate (32) can move back and forth along the axial direction of the heat exchange tube (31) and drive the corresponding heat exchange tube (31) to rotate around its own axis, so that the tube fluid is superimposed with circumferential disturbance on the basis of axial flow, forming a reciprocating spiral dynamic flow field. The spiral flow guide assembly is disposed in the shell-side space between adjacent heat exchange tubes (31) and can reciprocate around the tube bundle (3) to generate periodic disturbances to the shell-side flow field and destroy the thermal boundary layer of the outer wall of the heat exchange tube (31).

2. The waste heat recovery device for a galvanized sheet production line according to claim 1, characterized in that, The spiral guide assembly includes a spiral guide rod (11), which extends spirally around multiple heat exchange tubes (31) in the same layer, and a spiral guide rod (11) is provided on the outer periphery of each tube bundle (3).

3. The waste heat recovery device for a galvanized sheet production line according to claim 1, characterized in that, The spiral guide assembly includes multiple spiral guide rods (11), which are arranged at intervals along the axial direction of the tube bundle (3) and are arranged in a gradient from dense to sparse distribution from the inlet end of the shell-side medium to the outlet end.

4. A waste heat recovery device for a galvanized sheet production line according to claim 2 or 3, characterized in that, The spiral guide rods (11) of adjacent layers have opposite spiral directions, and during the reciprocating swing, the spiral guide rods (11) of adjacent layers swing in opposite directions to form a phase-interleaved reverse turbulence field in the shell side.

5. The waste heat recovery device for a galvanized sheet production line according to claim 4, characterized in that, The spiral guide rod (11) is rolled with balls (111) evenly distributed along its spiral direction, and the balls (111) roll in contact with the outer wall of the adjacent heat exchange tube (31).

6. The waste heat recovery device for a galvanized sheet production line according to claim 5, characterized in that, The outer surface of the spiral guide rod (11) is provided with a guide groove (112) extending along its spiral direction, which is used to form a local acceleration channel and pressure gradient change when the flue gas flows through the shell side.

7. The waste heat recovery device for a galvanized sheet production line according to claim 4, characterized in that, Connecting rings (113) are fixedly installed at the left and right ends of the spiral guide rod (11) in the same layer. A toothed ring (114) is fixedly installed on the right end of the connecting ring (113) on the right side. The toothed ring (114) is rotatably connected to the tube plate (2) on the corresponding side. A transmission gear (115) meshes between the toothed rings (114) of adjacent layers. The transmission gear (115) is rotatably installed on the corresponding tube plate (2). A drive gear (116) meshes on the outer side of the toothed ring (114) in the outermost layer. The drive gear (116) is connected to the output shaft of the motor (117).

8. The waste heat recovery device for a galvanized sheet production line according to claim 1, characterized in that, The baffle (32) includes multiple arc-shaped plates (321) evenly distributed along the axial direction of the heat exchange tube (31). The multiple arc-shaped plates (321) are fixedly installed on a spiral column (322). The inner wall of the heat exchange tube (31) is provided with a spiral groove (323) that slides with the spiral column (322).

9. A waste heat recovery device for a galvanized sheet production line according to claim 8, characterized in that, Multiple baffles (32) within the same heat exchange tube (31) are fixedly mounted on the same moving rod (325). The moving rod (325) is slidably mounted between the support rings (326) on the left and right sides. The support rings (326) are rotatably mounted on the inner wall of the heat exchange tube (31). The right end of the moving rod (325) is fixedly connected to the moving frame (327). A push frame (328) is installed on the right side of the moving frame (327). The push frame (328) is connected to the telescopic end of the electric push rod (329).

10. A waste heat recovery device for a galvanized sheet production line according to claim 9, characterized in that, Multiple turbulence rotors (324) are rotatably installed on the left and right sides of the arc plate (321), and each turbulence rotor (324) is evenly distributed along the circumference of the arc plate (321). The left end of the moving rod (325) is rotatably mounted with a guide rotor (330).

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