Intermediate frequency furnace waste heat recovery device

Abstract

This invention discloses a waste heat recovery device for a medium-frequency furnace, comprising a cylindrical body that is annular and hollow in the middle, with a cavity inside the annulus. A top cover is fixedly installed on the top of the cylinder. An external heat exchange mechanism is arranged inside the cavity of the cylinder, and an internal heat exchange mechanism is arranged in the hollow middle part of the cylinder. The external heat exchange mechanism includes a spiral conveying pipe, which is embedded inside the cavity of the cylinder. The spiral conveying pipe has a spiral square tube structure, and fixing plates are fixedly connected to both sides of the spiral conveying pipe. The fixing plates are fixedly connected to the inner wall of the cavity of the cylinder to fix the spiral conveying pipe. This invention overcomes the limitations of existing single heat exchange structures by adopting a dual heat exchange structure of internal and external heat exchange, realizing the graded absorption and full recovery of waste heat from flue gas. The dual heat exchange structure significantly improves the waste heat recovery and utilization rate, effectively avoiding energy waste caused by the direct emission of high-temperature flue gas.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization technology for medium-frequency furnaces, and particularly to a waste heat recovery device for medium-frequency furnaces. Background Technology

[0002] Induction furnaces are widely used in metallurgical, casting and other industrial production. During their operation, they generate a large amount of high-temperature flue gas. If the waste heat carried by the flue gas is directly discharged, it will not only cause serious energy waste, but also lead to an increase in ambient temperature, which does not meet the requirements of energy conservation, emission reduction and green environmental protection in industrial development.

[0003] Existing waste heat recovery devices for medium-frequency furnaces mostly adopt a single heat exchange structure, which has low heat exchange efficiency and cannot fully absorb the waste heat in the flue gas. At the same time, the flue gas contains a large amount of dust, and after long-term use, the surface of the heat exchange components is prone to ash accumulation, which further reduces the heat exchange effect. Moreover, the ash accumulation is difficult to clean and requires shutdown for disassembly and cleaning, affecting the continuity of production. In addition, some waste heat recovery devices lack an effective energy storage structure, and cannot continuously and stably output heat when the medium-frequency furnace is working intermittently, resulting in poor stability and practicality of waste heat utilization.

[0004] Therefore, based on the above-mentioned technical problems, it is necessary for those skilled in the art to develop a waste heat recovery device for medium-frequency furnaces. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a waste heat recovery device for a medium-frequency furnace, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A medium-frequency furnace waste heat recovery device includes a cylindrical body, which is annular and hollow in the middle. A cavity is opened inside the annular part of the cylindrical body. An upper cover is fixedly installed on the top of the cylindrical body. An external heat exchange mechanism is provided inside the cavity of the cylindrical body, and an internal heat exchange mechanism is provided in the hollow middle part of the cylindrical body. The external heat exchange mechanism includes a spiral conveying pipe, which is embedded inside the cavity of the cylinder. The spiral conveying pipe has a spiral square tube structure, and fixing plates are fixedly connected to both sides of the spiral conveying pipe. The fixing plates are fixedly connected to the inner wall of the cavity of the cylinder to fix the spiral conveying pipe. A top plate is fixedly provided at the top of the hollow part in the middle of the cylinder, and a lower cover is fixedly installed at the bottom of the cylinder. The cavity of the cylinder is filled with phase change material. Multiple heat exchange tubes are arranged equidistantly around the axis of the cylinder on one side. The heat exchange tubes penetrate the spiral conveying pipe and are fixedly connected to the spiral conveying pipe. At the same time, the heat exchange tubes penetrate the top and bottom of the cylinder. The tops of the multiple heat exchange tubes are fixedly connected to an annular shell. Multiple connecting pipes are fixedly connected between the annular shell and the top plate, and the hollow part in the middle of the cylinder is connected to the annular shell through the connecting pipes. A reciprocating dust removal assembly for cleaning the dust accumulated on the inner wall of the heat exchange tubes is provided at the top of the annular shell.

[0007] To address the issues of low heat exchange efficiency and inability to fully absorb waste heat from flue gas in a single heat exchange structure, the internal heat exchange mechanism includes a rotating rod that penetrates the lower cover and is rotatably connected to it via a bearing. A connecting column, a disc-shaped structure with a central circular through-hole, is fitted around the rotating rod via a bearing. The shafted portion of the connecting column penetrates the top plate, and the connection between the column and the top plate is rotatably connected via a bearing. A partition, shaped like an inverted funnel, is fitted around the rotating rod via a bearing, and its outer side is fixedly connected to the inner wall of the lower cover. The rotating rod penetrates the upper cover, and the connection between it and the upper cover is rotatably connected via a bearing. The top end of the rotating rod is fixedly connected to a first circular shell, the top of the first circular shell is connected to a first rotary joint, and the top of the first rotary joint is connected to a liquid inlet pipe; the bottom end of the rotating rod is fixedly connected to a second circular shell, the bottom of the second circular shell is connected to a second rotary joint, the bottom of the second rotary joint is connected to a transfer pipe, the other end of the transfer pipe passes through the upper cover and the annular shell in sequence and extends into the cavity of the cylinder and is fixedly connected to the top of the spiral conveying pipe; the bottom of the spiral conveying pipe is fixedly connected to a liquid outlet pipe, and the liquid outlet pipe extends to the outside of the cylinder; The rotating rod has multiple input channels at its top and multiple output channels at its bottom. Multiple heat exchange components arranged in a vertical array are mounted on the outer surface of the rotating rod. Each heat exchange component includes a fixing ring fitted around the rotating rod. Multiple heat exchange plates are fixedly connected to the inner side of the fixing ring, and each heat exchange plate has a heat exchange channel inside. Two through pipes are fixedly connected to one side of each heat exchange plate, and both through pipes are fixedly connected to the rotating rod. One through pipe connects the input channel to the input end of the heat exchange channel, and the other through pipe connects the output channel to the output end of the heat exchange channel. A rotating dust removal assembly is provided in the hollow middle section of the cylinder for cleaning the dust accumulated on its inner wall and heat exchange plates.

[0008] To address the issue of unstable rotation of the rotating rod and heat exchange components in the internal heat exchange mechanism, a base frame is fixedly installed at the bottom of the lower cover, and a motor is fixedly installed at the bottom of the base frame. The output shaft of the motor passes through the base frame, and the connection between the motor output shaft and the base frame is rotatably connected via a bearing. A second synchronous pulley is fixedly sleeved on the outside of the motor output shaft, and a first synchronous pulley is fixedly sleeved on the outside of the rotating rod. A synchronous belt is fitted around the outside of both the first and second synchronous pulleys. The motor drives the second synchronous pulley to rotate, which in turn drives the first synchronous pulley and the rotating rod to rotate synchronously via the synchronous belt.

[0009] To address the issue of easy ash accumulation and difficult cleaning of the inner wall of the heat exchange tube, the reciprocating ash removal assembly includes two electric push rods. These two electric push rods are symmetrically fixedly installed on the top of the upper cover, with their output ends penetrating the upper cover and extending into its interior. A first annular plate is fixedly connected to the output ends of both electric push rods. A second annular plate is rotatably connected to the bottom of the first annular plate, and a third annular plate is rotatably connected to the bottom of the second annular plate. Multiple push rods are fixedly connected to the bottom of the third annular plate, penetrating the annular shell and extending into the interior of the heat exchange tube. Multiple circular scrapers are fixedly connected to the outside of each push rod, and these scrapers are in close contact with the inner wall of the heat exchange tube. The circular scrapers have multiple vertically oriented grooves for the passage of flue gas and accumulated ash. A positioning rod is also fixedly installed at the bottom of the second annular plate.

[0010] To address the challenges of dust accumulation and difficult cleaning on the hollow inner wall of the cylinder and the surface of the heat exchange plates, the rotary dust removal assembly includes a dust removal plate located in the hollow middle section of the cylinder and in close contact with the hollow inner wall. A groove is formed on one side of the dust removal plate, matching the top and bottom outer walls of the heat exchange plates for cleaning dust accumulation on the plate surface. A bottom ring is fixedly connected to the bottom of the dust removal plate, fitted around a partition plate and rotatably connected to it via a bearing. The top of the dust removal plate is fixedly connected to a connecting column and rotates synchronously with the column. The bottom of the partition is provided with a ash passage groove. A box is fixedly installed on one side of the lower cover. The box penetrates the lower cover and is connected to the hollow part in the middle of the cylinder through the ash passage groove. A collection box is detachably installed inside the box. One side of the collection box extends out of the box and is fixedly connected to the box by bolts for centralized collection of ash.

[0011] To address the issues of ash accumulation during heat exchanger tube cleaning and the inability to collect residual dust in the flue gas, an ash collection shell is fixedly connected to the bottom of the cylinder. An ash collection box is detachably installed at the bottom of the ash collection shell. Slots are provided on both sides of the ash collection shell, and U-shaped clamps are installed inside the slots. The U-shaped clamps support the ash collection box to enable its detachable installation. An exhaust pipe for discharging flue gas is fixedly connected to one side of the ash collection shell.

[0012] In order to solve the problem that the operation of various components of the device cannot be centrally controlled, a controller for controlling the operation of various components of the device is fixedly installed on the outer surface of the cylinder.

[0013] To address the issue of high dust content in flue gas leading to rapid ash accumulation on heat exchange components and reduced heat exchange efficiency, a cyclone dust collector is installed on one side of the cylinder. The input end of the cyclone dust collector is connected to an inlet pipe, and its output end is connected to a conveying pipe. The end of the conveying pipe away from the cyclone dust collector passes through the ash-accumulating shell and the lower cover in sequence, connecting the hollow middle part of the cylinder to the cyclone dust collector, and is used to convey the flue gas pretreated by the cyclone dust collector to the inside of the cylinder.

[0014] To address the issue of unstable positioning of the connecting column, a baffle is fixedly installed at the top of the connecting column, and a through-hole is provided on the side of the connecting column near the baffle. A positioning unit is provided at the bottom of the connecting column, and the positioning unit includes a telescopic rod. The telescopic rod is fixedly installed on the top of the top plate, and a spring is sleeved on its outside. A positioning post is fixedly connected to the top of the telescopic rod, and the positioning post extends into the positioning hole to achieve the positioning of the connecting column. A steel ball is embedded in the top of the positioning post to reduce friction between the positioning post and the positioning hole and the positioning rod.

[0015] To address the issue of incomplete dust removal by the reciprocating dust removal assembly, a square column is fixedly fitted onto the outer surface of the rotating rod near the first circular shell. A through square groove is provided on one side of the second circular plate, through which the square column passes and is vertically slidably connected and circumferentially engaged with the second circular plate. This allows the rotating rod to drive the second circular plate to rotate synchronously without affecting its vertical movement.

[0016] The above technical solution has the following beneficial effects: 1. This invention overcomes the limitations of existing single heat exchange structures by employing a dual heat exchange structure of internal and external heat exchange, achieving graded absorption and full recovery of waste heat from flue gas. In the internal heat exchange mechanism, the rotating heat exchange components are in full contact with the pretreated flue gas, and the heat exchange channels opened inside the heat exchange plates enable efficient heat exchange between the medium and the flue gas, completing the initial waste heat recovery. In the external heat exchange mechanism, the flue gas enters the annular shell through the connecting pipe and is diverted to multiple heat exchange tubes that pass through the spiral conveying pipe, transferring the remaining waste heat to the medium inside the spiral conveying pipe for secondary heat exchange. The dual heat exchange structure significantly improves the waste heat recovery and utilization rate, effectively avoiding energy waste caused by the direct emission of high-temperature flue gas. The spiral conveying pipe adopts a spiral square tube structure, increasing the contact area with the phase change material and heat exchange tubes. The heat exchange plates are arranged in multiple arrays and rotate with the rotating rod, further enhancing the heat exchange effect and ensuring that the waste heat in the flue gas is absorbed to the maximum extent.

[0017] 2. This invention achieves the purpose of dust removal through a dual dust removal assembly consisting of reciprocating and rotary dust removal components. The dust removal process can be completed during normal operation of the device without affecting the production schedule. The reciprocating dust removal assembly is driven by an electric push rod to move the push rod and the circular scraper up and down inside the heat exchange tube. The circular scraper is in close contact with the inner wall of the heat exchange tube, which can thoroughly scrape off the ash accumulated on the inner wall. The through groove on the scraper avoids obstructing the flow of flue gas and the falling of ash. The rotary dust removal assembly cleans the ash accumulated on the hollow inner wall of the cylinder and the surface of the heat exchange plate simultaneously through the dust removal plate. The dust removal plate is precisely fitted with the heat exchange plate and the hollow inner wall of the cylinder and can rotate with the connecting column to achieve all-round dust removal. The scraped ash is collected centrally through the ash passage, collection box and ash collection box. During cleaning, only the collection box and ash collection box need to be removed. There is no need to disassemble the main body of the device, which greatly reduces the difficulty of maintenance, reduces downtime losses and ensures production continuity.

[0018] 3. This device fills the cavity of the cylinder with a high-temperature composite phase change material adapted to the temperature range of flue gas from an intermediate frequency furnace. This solves the problem of existing devices lacking an effective energy storage structure and being unable to continuously output heat during intermittent operation. When the intermediate frequency furnace is operating normally and the waste heat from the flue gas is sufficient, the phase change material absorbs heat and changes from a solid to a liquid state to achieve waste heat storage. When the intermediate frequency furnace is operating intermittently and the waste heat from the flue gas is insufficient, the phase change material changes from a liquid to a solid state to release heat, continuously heating the medium in the spiral conveying pipe. This ensures stable heat output, avoids interruption of waste heat utilization, improves the practicality and adaptability of the device, and can meet the continuous demand for waste heat utilization in industrial production. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 A bottom view of the overall structure provided for this invention; Figure 3 A cross-sectional view of the overall structure provided for this invention; Figure 4 A perspective view of the external heat exchange mechanism provided by the present invention; Figure 5 A perspective view of the spiral conveying pipe provided by the present invention; Figure 6 A perspective view of the dust removal plate provided by the present invention; Figure 7 This is a cross-sectional view of the heat exchange component provided by the present invention; Figure 8 A cross-sectional view of the rotating rod provided by the present invention; Figure 9 A perspective view of the reciprocating dust removal component provided by the present invention; Figure 10 Provided by the present invention Figure 2 Enlarged view of point A in the image; Figure 11 Provided by the present invention Figure 3 Enlarged view of point B in the image; Figure 12 Provided by the present invention Figure 3 Enlarged view of point C in the image; Figure 13 Provided by the present invention Figure 9 Enlarged view of point D in the image.

[0022] In the diagram: 1. Cylinder; 2. Upper cover; 3. Ash collection shell; 4. Electric push rod; 5. Controller; 6. Liquid outlet pipe; 7. Motor; 8. Ash collection box; 9. U-shaped clamp; 10. Air outlet pipe; 11. Cyclone dust collector; 12. Air inlet pipe; 13. Conveying pipe; 14. First circular shell; 15. First rotary joint; 16. Liquid inlet pipe; 17. Transfer pipe; 18. Lower cover; 19. Box body; 20. Collection box; 21. Spiral conveying pipe; 22. Ash removal plate; 23. Rotating rod; 24. Second circular shell; 25. Second rotary joint; 26. Partition plate; 27. Top plate; 28. Annular shell; 29. ​​Connecting... 30. Connecting column; 31. First annular plate; 32. Second annular plate; 33. Third annular plate; 34. Square column; 35. Base frame; 36. Heat exchange tube; 37. Fixing plate; 38. Push rod; 39. Heat exchange plate; 40. Fixing ring; 41. Baffle; 42. Bottom ring; 43. Limiting hole; 44. Through pipe; 45. Output channel; 46. Input channel; 47. Heat exchange channel; 48. First synchronous pulley; 49. Second synchronous pulley; 50. Synchronous belt; 51. Telescopic rod; 52. Spring; 53. Positioning column; 54. Steel ball; 55. Ash trough; 56. Circular scraper; 57. Positioning rod. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] See Figures 1-13 As shown, a medium-frequency furnace waste heat recovery device of the present invention includes a cylindrical body 1, which is annular and hollow in the middle. A cavity is opened inside the annular body of the cylindrical body 1. An upper cover 2 is fixedly installed on the top of the cylindrical body 1. An external heat exchange mechanism is provided inside the cavity of the cylindrical body 1, and an internal heat exchange mechanism is provided in the hollow middle part of the cylindrical body 1. The external heat exchange mechanism includes a spiral conveying pipe 21, which is embedded inside the cavity of the cylinder 1. The spiral conveying pipe 21 has a spiral square tube structure. Fixing plates 37 are fixedly connected to both sides of the spiral conveying pipe 21, and the fixing plates 37 are fixedly connected to the inner wall of the cavity of the cylinder 1 to fix the spiral conveying pipe 21. A top plate 27 is fixedly provided at the top of the hollow part in the middle of the cylinder 1, and a lower cover 18 is fixedly installed at the bottom of the cylinder 1. The cavity of the cylinder 1 is filled with a phase change material. Multiple [other components] are provided on one side of the cylinder 1. Heat exchange tubes 36 are equidistantly distributed around its axis. The heat exchange tubes 36 pass through and are fixedly connected to the spiral conveying pipe 21. At the same time, the heat exchange tubes 36 pass through the top and bottom of the cylinder 1. The top of the multiple heat exchange tubes 36 is fixedly connected to an annular shell 28. Multiple connecting pipes 29 are fixedly connected between the annular shell 28 and the top plate 27, and the hollow middle part of the cylinder 1 is connected to the annular shell 28 through the connecting pipes 29. The top of the annular shell 28 is provided with a reciprocating dust cleaning assembly for cleaning the dust accumulated on the inner wall of the heat exchange tubes 36.

[0025] Working Principle: The external heat exchange mechanism, as the core of the secondary heat exchange in the device, works in conjunction with the internal heat exchange mechanism to fully recover the waste heat from the flue gas. Simultaneously, it utilizes phase change materials to store the waste heat, ensuring stable heat output. After the internal heat exchange mechanism completes the initial heat exchange, the flue gas enters the annular shell 28 through the connecting pipe 29 between the top plate 27 and the annular shell 28, and is evenly distributed into multiple heat exchange tubes 36 equidistantly distributed around the axis of the cylinder 1. The heat exchange tubes 36 penetrate and are fixedly connected to the spiral conveying pipe 21, efficiently transferring the remaining waste heat from the flue gas to the medium within the spiral conveying pipe 21, achieving secondary heat exchange and further improving waste heat recovery efficiency. The phase change material filling the cavity of the cylinder 1 absorbs heat and changes from solid to liquid when there is sufficient waste heat from the flue gas, achieving waste heat storage. When the intermediate frequency furnace operates intermittently and the waste heat from the flue gas is insufficient, the phase change material changes from liquid to solid, releasing heat and continuously heating the medium within the spiral conveying pipe 21, preventing interruption of heat output and solving the problem of unstable heat output during intermittent operation. The spiral conveying pipe 21 adopts a spiral square tube structure, which increases the contact area with the phase change material and heat exchange tube 36, thereby improving the heat exchange efficiency. The fixing plates 37 on both sides ensure the installation stability of the spiral conveying pipe 21 in the cavity of the cylinder 1, preventing it from shifting or vibrating during the operation of the device, and ensuring a stable and orderly heat exchange process. The phase change material is a high-temperature composite phase change material, specifically a paraffin-expanded graphite composite phase change material, with a phase change temperature range of 80-120℃, which is suitable for the waste heat temperature range of 150-350℃ of the flue gas in the medium frequency furnace, taking into account both heat storage capacity and heat release stability. Paraffin is used as the main phase change medium, responsible for absorbing and releasing heat, while expanded graphite is used as a reinforcing agent, which can significantly improve the thermal conductivity of paraffin, solving the problems of low thermal conductivity and easy leakage of pure paraffin. At the same time, it enhances the formability of the phase change material, preventing volume collapse and loss during the solid-liquid conversion process.

[0026] The internal heat exchange mechanism includes a rotating rod 23 that passes through the lower cover 18 and is rotatably connected to the lower cover 18 via a bearing. A connecting column 30 is sleeved on the outside of the rotating rod 23 via a bearing. The connecting column 30 has a disc-shaped structure with a central circular through-hole through which the rotating rod 23 passes. The shaft portion of the connecting column 30 passes through the top plate 27, and the connection between the connecting column 30 and the top plate 27 is rotatably connected to the top plate 27 via a bearing. A partition plate 26 is sleeved on the outside of the rotating rod 23 via a bearing. The partition plate 26 is in the shape of an inverted funnel, and its outer side is fixedly connected to the inner wall of the lower cover 18. The rotating rod 23 passes through the upper cover 2, and the connection between the rotating rod 23 and the upper cover 2 is rotatably connected to the upper cover 2 via a bearing. The top end of the rotating rod 23 is fixedly connected to a first circular shell 14, the top of the first circular shell 14 is connected to a first rotary joint 15, and the top of the first rotary joint 15 is connected to a liquid inlet pipe 16; the bottom end of the rotating rod 23 is fixedly connected to a second circular shell 24, the bottom of the second circular shell 24 is connected to a second rotary joint 25, the bottom of the second rotary joint 25 is connected to a transfer pipe 17, the other end of the transfer pipe 17 passes through the upper cover 2 and the annular shell 28 in sequence and extends into the cavity of the cylinder 1 and is fixedly connected to the top of the spiral conveying pipe 21; the bottom of the spiral conveying pipe 21 is fixedly connected to a liquid outlet pipe 6, and the liquid outlet pipe 6 extends to the outside of the cylinder 1; The rotating rod 23 has multiple input channels 46 at its top end and multiple output channels 45 at its bottom end. Multiple heat exchange components arranged in a vertical array are disposed on the outer surface of the rotating rod 23. Each heat exchange component includes a fixing ring 40, which is sleeved on the outside of the rotating rod 23. Multiple heat exchange plates 39 are fixedly connected to the inner side of the fixing ring 40, and each heat exchange plate 39 has a heat exchange channel 47 inside. Two through pipes 44 are fixedly connected to one side of each heat exchange plate 39. Both through pipes 44 are fixedly connected to the rotating rod 23. One through pipe 44 connects the input channel 46 to the input end of the heat exchange channel 47, and the other through pipe 44 connects the output channel 45 to the output end of the heat exchange channel 47. The cylinder 1 has a hollow section in the middle, which is equipped with a rotary cleaning assembly for cleaning the dust accumulated on its inner wall and heat exchange plate 39. The bottom of the lower cover 18 is fixedly installed with a base frame 35, and the bottom of the base frame 35 is fixedly installed with a motor 7. The output shaft of the motor 7 passes through the base frame 35, and the connection between the output shaft of the motor 7 and the base frame 35 is rotatably connected by a bearing. A second synchronous pulley 49 is fixedly sleeved on the outside of the output shaft of the motor 7, and a first synchronous pulley 48 is fixedly sleeved on the outside of the rotating rod 23. The first synchronous pulley 48 and the second synchronous pulley 49 are both sleeved with a synchronous belt 50. The second synchronous pulley 49 is driven to rotate by the motor 7, and the first synchronous pulley 48 and the rotating rod 23 are driven to rotate synchronously by the synchronous belt 50.

[0027] Working principle of the internal heat exchange mechanism: The medium to be heated enters the first rotary joint 15 through the liquid inlet pipe 16, and is diverted through the first circular shell 14 to multiple input channels 46 at the top of the rotating rod 23. Then, it is transported through the through pipe 44 to the heat exchange channels 47 inside each heat exchange plate 39. After the high-temperature flue gas of the medium-frequency furnace enters the hollow part in the middle of the cylinder 1, it comes into full contact with the rotating heat exchange plate 39. The residual heat in the flue gas is transferred through the wall of the heat exchange plate 39 to the medium in the heat exchange channel 47, realizing the initial heat exchange. The medium after heat exchange flows through another through pipe 44 into the output channel 45 at the bottom of the rotating rod 23, and is then transported through the second circular shell 24, the second rotary joint 25 and the transfer pipe 17 to the spiral conveying pipe 21 for secondary heat exchange. The setting of the first rotary joint 15 and the second rotary joint 25 can avoid problems such as pipe entanglement and leakage caused by the rotation of the rotating rod 23 during the medium transportation process, and ensure the stability of the medium transportation.

[0028] Working principle of the motor drive mechanism: The motor drive mechanism provides stable power for the rotation of the internal heat exchange mechanism, ensuring full contact between the heat exchange plate 39 and the flue gas, and improving heat exchange efficiency. When the motor 7 is started, its output shaft drives the second synchronous pulley 49 to rotate at a uniform speed. The second synchronous pulley 49 smoothly transmits power to the first synchronous pulley 48 through the surface-fitted synchronous belt 50. Since the first synchronous pulley 48 is fixedly sleeved on the outside of the rotating rod 23, it drives the rotating rod 23 to rotate synchronously and uniformly, ultimately driving the heat exchange assembly to rotate. Synchronous belt drive features smooth transmission, low noise, high transmission efficiency, and precise transmission ratio, ensuring uniform rotation of the rotating rod 23, allowing full contact between the heat exchange plate 39 and the flue gas, avoiding uneven local heat exchange, and reducing energy loss during power transmission. The base frame 35 provides stable support for the motor 7, reducing the impact of motor 7 vibration on the overall structure of the device, preventing vibration-induced component loosening and leakage, and extending the device's service life. Bearings are installed at the connection between the motor 7 output shaft and the base frame 35 to reduce rotational friction, decrease component wear, and ensure smooth power transmission.

[0029] The reciprocating dust removal assembly includes two electric push rods 4, which are symmetrically fixedly installed on the top of the upper cover 2. Their output ends penetrate the upper cover 2 and extend into its interior. The output ends of the two electric push rods 4 are jointly fixedly connected to a first annular plate 31. A second annular plate 32 is rotatably connected to the bottom of the first annular plate 31, and a third annular plate 33 is rotatably connected to the bottom of the second annular plate 32. Multiple push rods 38 are fixedly connected to the bottom of the third annular plate 33. Each push rod 38 penetrates the annular shell 28 and extends into the interior of the heat exchange tube 36. Multiple push rods 38 are fixedly connected to the exterior of each push rod 38. A circular scraper 56 is in close contact with the inner wall of the heat exchange tube 36, and multiple vertical grooves are provided on the circular scraper 56 for the passage of flue gas and ash. A positioning rod 57 is fixedly provided at the bottom of the second annular plate 32. A square column 34 is fixedly sleeved on the outer surface of the rotating rod 23 near the end of the first circular shell 14. A through square groove is provided on one side of the second annular plate 32. The square column 34 passes through the through square groove and is vertically slidably connected to the second annular plate 32 and circumferentially engaged, so that the rotating rod 23 can drive the second annular plate 32 to rotate synchronously without affecting the vertical movement of the second annular plate 32.

[0030] Working Principle: The reciprocating cleaning assembly is used to clean the inner wall of the heat exchange tube 36 in an all-round, thorough manner, preventing ash accumulation from clogging the heat exchange tube 36 and reducing heat exchange efficiency. It also eliminates the need for machine shutdown and disassembly, ensuring continuous production. When the ash accumulation on the inner wall of the heat exchange tube 36 reaches a certain level and cleaning is required, the controller 5 periodically activates two symmetrically installed electric push rods 4, stopping the motor 7. The output ends of the electric push rods 4 extend and retract synchronously, driving the first annular plate 31 to reciprocate up and down. The first annular plate 31, through a rotating connection, drives the second annular plate 32 and the third annular plate 33 to move synchronously up and down. The third annular plate 33, in turn, drives multiple push rods 38 fixed at the bottom and the circular scraper 56 outside the push rods 38 to reciprocate up and down inside the heat exchange tube 36. The circular scraper 56 is in close contact with the inner wall of the heat exchange tube 36, thoroughly scraping away the ash adhering to the inner wall during movement. Simultaneously, the vertical grooves on the circular scraper 56 prevent the scraper from obstructing flue gas flow and ash fall, ensuring that the heat exchange and cleaning processes do not interfere with each other. After cleaning, the accumulated ash falls with the flue gas into the ash collection shell 3 for subsequent collection. The entire cleaning process can be carried out during normal operation of the equipment without stopping the machine for disassembly, effectively ensuring production continuity and reducing maintenance costs.

[0031] The rotary cleaning assembly includes a cleaning plate 22, which is located in the hollow middle part of the cylinder 1 and is in close contact with the hollow inner wall of the cylinder 1. A groove is provided on one side of the cleaning plate 22, which matches the top and bottom outer walls of the heat exchange plate 39 for cleaning the dust accumulated on the surface of the heat exchange plate 39. A bottom ring 42 is fixedly connected to the bottom of the cleaning plate 22, which is sleeved on the outside of the partition plate 26 and is rotatably connected to the partition plate 26 through a bearing. The top of the cleaning plate 22 is fixedly connected to the connecting column 30 and rotates synchronously with the connecting column 30. The bottom of the partition 26 is provided with a ash passage 55. A box 19 is fixedly installed on one side of the lower cover 18. The box 19 passes through the lower cover 18 and is connected to the hollow middle part of the cylinder 1 through the ash passage 55. A collection box 20 is detachably installed inside the box 19. One side of the collection box 20 extends out of the box 19 and is fixedly connected to the box 19 by bolts for centralized collection of ash.

[0032] Working Principle: The rotary dust removal assembly is used to simultaneously clean the accumulated dust on the hollow inner wall of the cylinder 1 and the surface of the heat exchange plate 39, while also achieving centralized collection of accumulated dust to prevent dust accumulation from affecting heat exchange efficiency. The cleaning operation is also convenient. When it is necessary to clean the accumulated dust on the hollow inner wall of the cylinder 1 and the surface of the heat exchange plate 39, the limiting unit releases the limiting unit from the connecting column 30. The connecting column 30 rotates synchronously under the drive of the positioning rod 57, which in turn drives the top-fixed dust removal plate 22 to rotate synchronously. The outer side of the dust removal plate 22 is in close contact with the hollow inner wall of the cylinder 1, and the accumulated dust adhering to the inner wall can be thoroughly scraped off during rotation. At the same time, the grooves on the dust removal plate 22 precisely fit the top and bottom outer walls of the heat exchange plate 39. When the positioning rod 53 of the limiting unit positions the connecting column 30, the dust removal plate 22 cannot rotate. When the heat exchange plate 39 rotates, the grooves can scrape off the accumulated dust adhering to the surface of the heat exchange plate 39, achieving synchronous dust removal. The bottom ring 42 of the cleaning plate 22 is fitted onto the outside of the partition plate 26 and is rotatably connected by a bearing, which ensures the stability of the cleaning plate 22's rotation and reduces rotational friction. The scraped ash falls onto the inverted funnel-shaped partition plate 26, is pushed by the rotation of the cleaning plate 22 to collect into the ash passage trough 55, and then falls into the collection box 20 inside the box body 19, achieving centralized collection of ash. The collection box 20 is detachably connected to the box body 19 by bolts. When the collection box 20 is full, the bolts can be unscrewed to remove the collection box 20 for cleaning. After cleaning, it can be reinstalled and fixed. The operation is convenient, without disassembling the main body of the device, reducing maintenance difficulty.

[0033] The bottom of the cylinder 1 is fixedly connected to an ash collection shell 3, and an ash collection box 8 is detachably installed at the bottom of the ash collection shell 3; slots are provided on both sides of the ash collection shell 3, and a U-shaped card plate 9 is installed inside the slots. The U-shaped card plate 9 supports the ash collection box 8 to achieve its detachable installation; an exhaust pipe 10 for discharging flue gas is fixedly connected to one side of the ash collection shell 3.

[0034] Working Principle: The ash collection mechanism is used to collect the ash accumulated during the cleaning of heat exchange tubes 36 and residual dust in the flue gas that has not been completely cleaned, achieving secondary ash collection, reducing dust emissions, and avoiding secondary pollution. The ash scraped off the inner wall of the heat exchange tubes 36 will enter the ash collection shell 3 at the bottom of the cylinder 1 along with the flue gas. The ash collection shell 3 provides a settling space for the flue gas and ash. Under the action of gravity, the denser ash will gradually fall into the ash collection box 8 at the bottom of the ash collection shell 3, achieving secondary ash collection. The ash collection box 8 is detachably connected to the ash collection shell 3 by a U-shaped clamping plate 9. The U-shaped clamping plate 9 is locked in the slots on both sides of the ash collection shell 3, providing a stable support for the ash collection box 8. When the ash collection box 8 is full, the U-shaped clamping plate 9 can be removed directly, the ash collection box 8 can be taken out for cleaning, and after cleaning, it can be put back into the bottom of the ash collection shell 3, and then the U-shaped clamping plate 9 can be locked to complete the installation. The operation is simple and convenient, and no tools are required. After the flue gas settles and accumulates ash in the ash collection shell 3, it is discharged through the outlet pipe 10 on one side of the ash collection shell 3.

[0035] A controller 5 for controlling the operation of various components of the device is fixedly installed on the outer surface of the cylinder 1.

[0036] Working Principle: Controller 5, as the core control unit of the device, realizes centralized automated control of various components, reduces manual operation intensity, and ensures the stability of device operation and waste heat recovery efficiency. Controller 5 is electrically connected to all electrical components such as motor 7 and electric push rod 4, and can centrally control the operating status of each component. For example, it can precisely control the start / stop and speed of motor 7, adjust the rotation speed of the heat exchange components to ensure uniform heat exchange; and control the extension / retraction stroke and frequency of electric push rod 4 to realize automated cleaning of the reciprocating cleaning components. The cleaning cycle can be set according to the ash accumulation, eliminating the need for manual operation. Simultaneously, controller 5 can be connected to detection elements such as temperature sensors to collect key parameters such as flue gas temperature, medium inlet temperature, and medium outlet temperature in real time. Based on parameter changes, it automatically adjusts the operating parameters of each component. For example, when the flue gas temperature is too high, the speed of motor 7 is appropriately increased to accelerate the rotation speed of the heat exchange components and improve heat exchange efficiency; when the medium outlet temperature reaches the set value, the heat storage rhythm of the phase change material is adjusted to ensure stable heat output. In addition, the controller 5 also has a fault alarm function. When a component malfunctions, it can issue an alarm signal in a timely manner to remind staff to carry out timely repairs, prevent the fault from escalating, further improve the practicality and convenience of the device, and reduce manual operation and maintenance costs.

[0037] A cyclone dust collector 11 is provided on one side of the cylinder 1. The input end of the cyclone dust collector 11 is connected to an air inlet pipe 12, and its output end is connected to a conveying pipe 13. The end of the conveying pipe 13 away from the cyclone dust collector 11 passes through the dust accumulation shell 3 and the lower cover 18 in sequence, connecting the hollow middle part of the cylinder 1 to the cyclone dust collector 11, and is used to convey the flue gas pretreated by the cyclone dust collector 11 to the inside of the cylinder 1.

[0038] Working Principle: The cyclone dust collector is used for preliminary dust removal and pretreatment of the high-temperature flue gas generated by the medium-frequency furnace, reducing the dust content in the flue gas, slowing down the ash accumulation rate of heat exchange components, extending the service life of the components, and ensuring stable heat exchange efficiency. The high-temperature flue gas generated during the operation of the medium-frequency furnace carries a large number of dust particles of different sizes and densities, which are transported to the cyclone dust collector 11 through the inlet pipe 12. Inside the cyclone dust collector 11, the flue gas rotates at high speed along the inner wall. Using centrifugal force, larger and denser dust particles in the flue gas are separated from the flue gas. These dust particles fall to the ash collection device at the bottom of the cyclone dust collector 11 under gravity, achieving preliminary dust removal of the flue gas. After pretreatment, the dust content in the flue gas is significantly reduced. The gas is then transported through conveying pipe 13 to the hollow section in the middle of the cylinder 1 for heat exchange. This effectively reduces dust adhesion to the surfaces of heat exchange components such as heat exchange plates 39 and heat exchange tubes 36, slows down dust accumulation, prevents dust from clogging the heat exchange channels, and ensures stable heat exchange efficiency. Simultaneously, it reduces dust wear on heat exchange components, extends their service life, lowers maintenance costs, and reduces the burden on subsequent dust removal components.

[0039] A baffle 41 is fixedly provided on the top of the connecting column 30, and a through limiting hole 43 is provided on the side of the connecting column 30 near the baffle 41; a limiting unit is provided at the bottom of the connecting column 30, the limiting unit includes a telescopic rod 51, the telescopic rod 51 is fixedly installed on the top of the top plate 27, and a spring 52 is sleeved on its outside; a positioning post 53 is fixedly connected to the top of the telescopic rod 51, and the positioning post 53 extends into the limiting hole 43 to realize the limiting of the connecting column 30; a steel ball 54 is embedded in the top of the positioning post 53 to reduce the friction between the positioning post 53 and the limiting hole 43 and the positioning rod 57.

[0040] Working principle: The limiting unit is used to precisely limit and unlock the connecting column 30, ensuring that the cleaning plate 22 remains stationary in the non-cleaning state, without affecting the heat exchange process. In the cleaning state, it can rotate smoothly to achieve the cleaning function. Under normal heat exchange conditions, the spring 52 is in a naturally extended state, pushing the telescopic rod 51 upward, so that the positioning column 53 is precisely inserted into the limiting hole 43 of the connecting column 30, achieving stable limiting of the connecting column 30 and preventing the connecting column 30 from rotating erroneously due to device vibration or flue gas impact. This ensures that the cleaning plate 22 remains stationary, does not interfere with the normal rotation of the heat exchange plate 39 for heat exchange and cleaning, and ensures stable heat exchange efficiency. When the rotary cleaning process needs to be initiated, the second annular plate 32 of the reciprocating cleaning assembly drives the positioning rod 57 downward. During its downward movement, the positioning rod 57 contacts the baffle 41, achieving initial positioning. It then continues to move downward and inserts into the limiting hole 43, pushing the steel ball 54 and the positioning post 53 within the limiting hole 43 downward. The telescopic rod 51 contracts under pressure, the spring 52 is compressed, and the positioning post 53 gradually disengages from the limiting hole 43, releasing the limiting effect on the connecting post 30. At this time, the rotating rod 23 rotates, causing the positioning rod 57 to rotate synchronously. The positioning rod 57 drives the connecting post 30 to rotate synchronously through the limiting hole 43, thereby driving the cleaning plate 22 to rotate and achieve cleaning. The steel ball 54 embedded at the top of the positioning post 53 converts sliding friction into rolling friction at the bottom of the rotating connecting post 30, significantly reducing frictional wear between components, extending the service life of the limiting unit and the connecting post 30, ensuring smooth limiting and unlocking processes, and preventing jamming.

[0041] The process of using this invention: The high-temperature flue gas generated by the medium-frequency furnace is transported to the cyclone dust collector 11 through the inlet pipe 12. After being dusted by the cyclone dust collector 11, it is then transported to the inside of the cylinder 1 through the conveying pipe 13. The medium to be heated is introduced through the liquid inlet pipe 16. The heated medium passes through the first rotary joint 15 and the first circular shell 14 in sequence, and then enters the input channel 46. The medium enters the heat exchange channel 47 through the through pipe 44 and then enters the output channel 45 through another through pipe 44. The flue gas heats the heat exchange plate 39. The medium enters the second circular shell 24 and the second rotary joint 25 in sequence, and then enters the transfer pipe 17. It is then transported to the inside of the spiral conveying pipe 21 through the transfer pipe 17, and then discharged through the liquid outlet pipe 6 at the bottom of the spiral conveying pipe 21. The phase change material filled inside the cylinder 1 changes from solid to solid. The gas is converted into liquid energy storage, which heats the spiral conveying pipe 21, thus heating the medium inside the spiral conveying pipe 21. The flue gas enters the annular shell 28 through the connecting pipe 29, and then enters the heat exchange tube 36 through the annular shell 28, further heating the medium flowing inside the spiral conveying pipe 21. The flue gas enters the ash collection shell 3 and is then discharged through the exhaust pipe 10. The motor 7 is started, and the motor 7 controls the output shaft to rotate, which drives the second synchronous pulley 49 to rotate. The second synchronous pulley 49 drives the synchronous belt 50 to rotate, the synchronous belt 50 drives the first synchronous pulley 48 to rotate, the first synchronous pulley 48 drives the rotating rod 23 to rotate, and the rotating rod 23 drives the through pipe 44, the heat exchange plate 39, and the fixed ring 40 to rotate, so that the heat exchange plate 39 can be heated evenly. During the rotation of the heat exchange plate 39, the groove of the ash cleaning plate 22 is aligned with the heat exchange plate. 39. Clean the upper and lower surfaces to avoid affecting heat exchange. When dust accumulates on the hollow inner wall of the cylinder 1 and the inner wall of the heat exchange tube 36, clean them regularly. First, control the rotating rod 23 to rotate slowly. The rotating rod 23 drives the square column 34 to rotate. The square column 34 drives the first annular plate 31 to rotate. The second annular plate 32 drives the positioning rod 57 to rotate. Start the electric push rod 4. The electric push rod 4 controls the first annular plate 31, the second annular plate 32 and the third annular plate 33 to move down. The second annular plate 32 drives the positioning rod 57 to move down. Then the rotating positioning rod 57 contacts the baffle 41, the rotating rod 23 stops rotating, and then the positioning rod 57 continues to move down into the limiting hole 43. The positioning rod 57 pushes the steel ball 54 and the positioning column 53, and the telescopic rod 51 and the spring 52 are compressed. Positioning column 53 and steel ball 54 disengage from limiting hole 43, then continue to control rotating rod 23 to rotate, causing positioning rod 57 to rotate and drive connecting column 30 to rotate. Connecting column 30 drives cleaning plate 22 to rotate. Cleaning plate 22 rotates and cleans the hollow inner wall of cylinder 1. The cleaned ash falls on partition plate 26 and is pushed to ash passage trough 55 by cleaning plate 22, and then falls into collection box 20 for collection, achieving the effect of rotational cleaning. Control rotating rod 23 to stop rotating, control third ring plate 33 to move up and down reciprocally and drive push rod 38 to move up and down reciprocally. Push rod 38 drives circular scraper 56 to move up and down reciprocally and clean the inner wall of heat exchange tube 36. The vertical passage of circular scraper 56 facilitates the passage of ash and flue gas. Ash is collected through ash collection box 8 and flue gas is discharged through outlet pipe 10.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. An intermediate frequency furnace waste heat recovery device comprising a cylinder (1), characterized in that: The barrel (1) is annular and hollow in the middle, a cavity is formed in the barrel (1), an upper cover (2) is fixedly installed on the top of the barrel (1), an outer heat exchange mechanism is arranged in the cavity of the barrel (1), and an inner heat exchange mechanism is arranged in the hollow part of the barrel (1); The outer heat exchange mechanism comprises a spiral conveying pipe (21), the spiral conveying pipe (21) is embedded in the cavity of the barrel (1), the spiral conveying pipe (21) is a spiral square pipe structure, and the two sides of the spiral conveying pipe (21) are fixedly connected with the fixed plates (37); the fixed plates (37) are fixedly connected with the inner wall of the cavity of the barrel (1) to fix the spiral conveying pipe (21); a top plate (27) is fixedly arranged on the top of the hollow part of the barrel (1), a lower cover (18) is fixedly installed on the bottom of the barrel (1), and the cavity of the barrel (1) is filled with a phase change material; a plurality of heat exchange pipes (36) are arranged on one side of the barrel (1) and equidistantly distributed around the axis of the barrel (1), the heat exchange pipes (36) penetrate the spiral conveying pipe (21) and are fixedly connected with the spiral conveying pipe (21), and the heat exchange pipes (36) penetrate the top and the bottom of the barrel (1); the top of the plurality of heat exchange pipes (36) is fixedly connected with a ring-shaped shell (28), a plurality of connecting pipes (29) are fixedly connected between the ring-shaped shell (28) and the top plate (27), and the hollow part of the barrel (1) is connected with the ring-shaped shell (28) through the connecting pipes (29); a reciprocating dust cleaning assembly for cleaning the inner wall of the heat exchange pipe (36) is arranged on the top of the ring-shaped shell (28).

2. The intermediate frequency furnace waste heat recovery device according to claim 1, characterized in that: The inner heat exchange mechanism comprises a rotating rod (23), the rotating rod (23) penetrates the lower cover (18), and the connecting part of the rotating rod (23) and the lower cover (18) is rotatably connected through a bearing; a connecting column (30) is arranged on the outer part of the rotating rod (23) through a bearing, the connecting column (30) is a disc structure with an axis, a circular through hole is formed in the middle of the connecting column (30), and the rotating rod (23) penetrates the circular through hole; the connecting column (30) penetrates the top plate (27), and the connecting part of the connecting column (30) and the top plate (27) is rotatably connected through a bearing; a partition plate (26) is arranged on the outer part of the rotating rod (23) through a bearing, the partition plate (26) is in an inverted funnel shape, and the outer side of the partition plate (26) is fixedly connected with the inner wall of the lower cover (18); the rotating rod (23) penetrates the upper cover (2), and the connecting part of the rotating rod (23) and the upper cover (2) is rotatably connected through a bearing; The top end of the rotating rod (23) is fixedly connected to a first circular shell (14), the top of the first circular shell (14) is connected to a first rotary joint (15), and the top of the first rotary joint (15) is connected to an inlet pipe (16); the bottom end of the rotating rod (23) is fixedly connected to a second circular shell (24), the bottom of the second circular shell (24) is connected to a second rotary joint (25), the bottom of the second rotary joint (25) is connected to a transfer pipe (17), the other end of the transfer pipe (17) passes through the upper cover (2) and the annular shell (28) in sequence and extends into the cavity of the cylinder (1) and is fixedly connected to the top of the spiral conveying pipe (21); the bottom of the spiral conveying pipe (21) is fixedly connected to an outlet pipe (6), and the outlet pipe (6) extends to the outside of the cylinder (1); The top end of the rotating rod (23) is provided with multiple input channels (46), and the bottom end is provided with multiple output channels (45); the outer surface of the rotating rod (23) is provided with multiple heat exchange components arranged in a vertical array, each heat exchange component including a fixing ring (40), the fixing ring (40) being sleeved on the outside of the rotating rod (23), and multiple heat exchange plates (39) being fixedly connected to the inner side of the fixing ring (40), each heat exchange plate (39) having a heat exchange channel (47) inside. Two pipes (44) are fixedly connected to one side of the heat exchange plate (39). Both pipes (44) are fixedly connected to the rotating rod (23). One pipe (44) connects the input channel (46) to the input end of the heat exchange channel (47), and the other pipe (44) connects the output channel (45) to the output end of the heat exchange channel (47). A rotating dust removal assembly for cleaning the dust accumulated on the inner wall and heat exchange plate (39) of the hollow part in the middle of the cylinder (1) is provided.

3. The intermediate frequency furnace waste heat recovery device according to claim 2, characterized in that: A base frame (35) is fixedly installed at the bottom of the lower cover (18), and a motor (7) is fixedly installed at the bottom of the base frame (35). The output shaft of the motor (7) passes through the base frame (35), and the connection between the output shaft of the motor (7) and the base frame (35) is rotatably connected by a bearing. A second synchronous wheel (49) is fixedly sleeved on the outside of the output shaft of the motor (7), and a first synchronous wheel (48) is fixedly sleeved on the outside of the rotating rod (23). A synchronous belt (50) is sleeved on the outside of the first synchronous wheel (48) and the second synchronous wheel (49). The second synchronous wheel (49) is driven to rotate by the motor (7), and the first synchronous wheel (48) and the rotating rod (23) are driven to rotate synchronously by the synchronous belt (50).

4. The intermediate frequency furnace waste heat recovery device according to claim 3, characterized in that: The reciprocating dust removal assembly includes two electric push rods (4), which are symmetrically fixedly installed on the top of the upper cover (2), with their output ends penetrating the upper cover (2) and extending into the interior of the upper cover (2); the output ends of the two electric push rods (4) are jointly fixedly connected to a first annular plate (31), the bottom of the first annular plate (31) is rotatably connected to a second annular plate (32), and the bottom of the second annular plate (32) is rotatably connected to a third annular plate (33); the first The bottom of the three-ring plate (33) is fixedly connected with a plurality of push rods (38), which penetrate the annular shell (28) and extend into the interior of the heat exchange tube (36). The outside of the push rod (38) is fixedly connected with a plurality of circular scrapers (56), which are in close contact with the inner wall of the heat exchange tube (36), and the circular scrapers (56) are provided with a plurality of vertical grooves for flue gas and ash to pass through. The bottom of the second ring plate (32) is also fixedly provided with a positioning rod (57).

5. The intermediate frequency furnace waste heat recovery device according to claim 2, characterized in that: The rotating dust removal assembly includes a dust removal plate (22), which is located in the hollow middle part of the cylinder (1) and is in close contact with the hollow inner wall of the cylinder (1); a groove is provided on one side of the dust removal plate (22), which matches the top and bottom outer walls of the heat exchange plate (39) and is used to clean the dust accumulated on the surface of the heat exchange plate (39); a bottom ring (42) is fixedly connected to the bottom of the dust removal plate (22), which is sleeved on the outside of the partition plate (26) and is rotatably connected to the partition plate (26) by a bearing; the top of the dust removal plate (22) is fixedly connected to the connecting column (30) and rotates synchronously with the connecting column (30); The bottom of the partition (26) is provided with a ash passage groove (55). A box (19) is fixedly installed on one side of the lower cover (18). The box (19) passes through the lower cover (18) and is connected to the hollow part in the middle of the cylinder (1) through the ash passage groove (55). A collection box (20) is detachably installed inside the box (19). One side of the collection box (20) extends out of the box (19), and the collection box (20) is fixedly connected to the box (19) by bolts for centralized collection of ash.

6. The intermediate frequency furnace waste heat recovery device according to claim 1, characterized in that: The bottom of the cylinder (1) is fixedly connected to an ash collection shell (3), and an ash collection box (8) is detachably provided at the bottom of the ash collection shell (3); slots are provided on both sides of the ash collection shell (3), and a U-shaped card plate (9) is installed inside the slots. The U-shaped card plate (9) supports the ash collection box (8) to achieve its detachable installation; an exhaust pipe (10) for discharging flue gas is fixedly connected to one side of the ash collection shell (3).

7. The intermediate frequency furnace waste heat recovery device according to claim 1, characterized in that: A controller (5) for controlling the operation of each component of the device is fixedly installed on the outer surface of the cylinder (1).

8. The intermediate frequency furnace waste heat recovery device according to claim 1, characterized in that: A cyclone dust collector (11) is provided on one side of the cylinder (1). The input end of the cyclone dust collector (11) is connected to an air inlet pipe (12), and its output end is connected to a conveying pipe (13). The end of the conveying pipe (13) away from the cyclone dust collector (11) passes through the dust accumulation shell (3) and the lower cover (18) in sequence, connecting the hollow middle part of the cylinder (1) to the cyclone dust collector (11), and is used to convey the flue gas pretreated by the cyclone dust collector (11) to the inside of the cylinder (1).

9. The intermediate frequency furnace waste heat recovery device according to claim 2, characterized in that: A baffle (41) is fixedly provided on the top of the connecting column (30), and a through limiting hole (43) is provided on the side of the connecting column (30) near the baffle (41); a limiting unit is provided at the bottom of the connecting column (30), the limiting unit includes a telescopic rod (51), the telescopic rod (51) is fixedly installed on the top of the top plate (27), and a spring (52) is sleeved on its outside; a positioning column (53) is fixedly connected to the top of the telescopic rod (51), and the positioning column (53) extends into the limiting hole (43) to realize the limiting of the connecting column (30); a steel ball (54) is embedded in the top of the positioning column (53) to reduce the friction between the positioning column (53) and the limiting hole (43) and the positioning rod (57).

10. The device for recovering waste heat from an intermediate frequency furnace according to claim 4, characterized in that: A square column (34) is fixedly fitted on the outer surface of the rotating rod (23) near the end of the first circular shell (14); a through square groove is provided on one side of the second circular plate (32), the square column (34) passes through the through square groove, and is vertically slidably connected to the second circular plate (32) and circumferentially fastened, so that the rotating rod (23) can drive the second circular plate (32) to rotate synchronously, and does not affect the vertical movement of the second circular plate (32).

Images