A kiln waste heat recovery device

Abstract

The present application relates to kiln waste heat utilization technical field, especially to a kind of kiln waste heat recovery device, including heating pipe, the heating pipe bottom is connected with flue, the heating pipe top is fixed with flue, the heating pipe is fixed with heat conduction disc inside, the heating pipe below heat conduction disc is fixed with heat conduction pipe, the heat conduction pipe is spirally arranged in heating pipe, the heat conduction pipe bottom is fixed with water inlet pipe, the heat conduction pipe top is connected with heat conduction disc, the heat conduction disc is connected with water pump by water outlet pipe, the heat conduction disc is also uniformly fixed with the gas guide pipe that penetrates heat conduction disc, the gas guide pipe below is uniformly provided with support plate, the support plate is provided with support rod that penetrates support plate and is slidably connected with support plate, the support rod above support plate is fixed with support block.This device can effectively avoid dust gathering on the surface of heat conduction pipe and the inner wall of gas guide pipe, avoid dust accumulation to affect heat transfer effect.

Description

Technical Field

[0001] This invention relates to the field of kiln waste heat utilization technology, and in particular to a kiln waste heat recovery device. Background Technology

[0002] A kiln is a device constructed of refractory materials used to calcine materials or fire finished products. Various kilns for firing pottery, porcelain, and other ceramics have existed in China since ancient times. The raw materials need to be calcined at high temperatures in the kiln to form the desired components. Depending on the type of material being calcined, kilns can be classified as brick kilns, porcelain kilns, pottery kilns, cement kilns, etc. Because the firing temperature inside a kiln is extremely high, the high-temperature waste gas from traditional kilns is discharged through exhaust pipes and then recovered through a waste heat recovery device.

[0003] Patent application number CN202310785557.X discloses a kiln waste heat recovery and utilization device, including an installation bucket detachably connected to a flue pipe and a first heat-conducting plate and a second heat-conducting plate coaxially arranged inside the installation bucket. The bottom of the installation bucket has an air inlet groove communicating with the flue pipe, and the top of the installation bucket has an exhaust groove. The first heat-conducting plate is located below the second heat-conducting plate. The first heat-conducting plate is hollow inside, and several air guides are vertically arranged between the top and bottom of the first heat-conducting plate. The system comprises a tube, a first heat-conducting plate, and a second heat-conducting plate. The top of the first heat-conducting plate has several through-slots, each connected to a specific air-conducting pipe. The system includes a rotating shaft and a spiral heat-conducting pipe. The rotating shaft is vertically positioned inside the mounting barrel, with its bottom end vertically passing through and coaxially fixed to both the first and second heat-conducting plates. The top of the rotating shaft extends vertically outside the mounting barrel via an exhaust slot and has a water inlet slot. The spiral heat-conducting pipe is located at the bottom of the first heat-conducting plate and inside the exhaust pipe. The system utilizes the waste heat of the flue gas by exchanging heat with the flue gas through the heat-conducting plates and pipes to heat the water. However, because the pipes are exposed to the high-temperature flue gas emitted from the kiln for extended periods, dust easily adheres to the outer wall of the heat-conducting pipe and the inner wall of the air-conducting pipe of the heat-conducting plate. This dust accumulates over time, affecting the heating of the water and reducing the recovery efficiency.

[0004] This invention was proposed in response to the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a kiln waste heat recovery device.

[0006] This invention can be achieved through the following technical solutions: This invention discloses a kiln waste heat recovery device, comprising a heating tube, the bottom of which is connected to a flue pipe, and a flue outlet pipe fixed to the top of the heating tube. A heat-conducting plate is fixed inside the heating tube, and another heat-conducting tube is fixed inside the heating tube below the heat-conducting plate. The heat-conducting tubes are spirally arranged inside the heating tube, and a water inlet pipe is fixed to the bottom of the heat-conducting tubes. The top of the heat-conducting tubes is connected to the heat-conducting plate, and the heat-conducting plate is connected to a water pump via a water outlet pipe. Air guide pipes are also evenly fixed on the heat-conducting plate, penetrating it. A support plate is provided below each air guide pipe, and a support rod is provided on the support plate, penetrating and slidably connected to it. Support rods are located above the support plates. A support block is fixed on the top, and springs are fixed between the support block and the support plate. A scraper that mates with the inner wall of the air guide pipe is fixed on the support rod. A conical block is fixed on the support rod. A motor is also fixed on the heating tube. A rotating shaft is fixed at the output end of the motor. A scraper is also fixed on the rotating shaft above the heat conduction plate. An external thread is also fixed on the rotating shaft at the position of the heat conduction tube. A threaded tube that is threadedly connected to the external thread is provided on the rotating shaft at the position of the external thread. A positioning rod is also fixed inside the heating tube. The positioning rod passes through the threaded tube and is slidably connected to the threaded tube. A cleaning ring is also fitted on the heat conduction tube. The cleaning ring is connected to the threaded tube through a connecting rod.

[0007] Preferably, a limit block is fixed on the support rod below the support plate.

[0008] Preferably, the scraper spiral is disposed inside the air guide pipe.

[0009] Preferably, the scraper has an arc-shaped structure, and there is a gap between the heat-conducting plate and the heating tube. A cleaning rod is also fixed to the scraper at the gap position. The arc-shaped scraper pushes the dust adhering to the upper surface of the heat-conducting plate to the gap position when it rotates. Furthermore, the cleaning rod effectively prevents dust from accumulating in the gap, allowing the dust to fall through the gap and be collected at the bottom of the heating tube.

[0010] Preferably, one end of the connecting rod is fixed to the connecting pipe, the connecting pipe is sleeved on the surface of the threaded pipe and rotatably connected to the threaded pipe, and the other end of the connecting rod is rotatably connected to the cleaning pipe.

[0011] Preferably, a conical tube is fixed to the bottom of the heating tube, and a slag discharge pipe is fixed to the bottom of the conical tube. Two valves are fixed on the slag discharge pipe. After dust falls onto the conical tube, it accumulates at the slag discharge pipe. First, the valve at the top of the slag discharge pipe is opened, and the dust falls into the slag discharge pipe between the two valves. Then, the upper valve is closed, and the lower valve is opened, allowing the dust to be discharged and collected through the slag discharge pipe. This prevents flue gas from being discharged through the slag discharge pipe when the dust is discharged.

[0012] Compared with existing technologies, the present invention has the following advantages: After the flue gas and clean water exchange heat for a period of time, the cleaning ring driven by the motor slides on the surface of the heat pipe to separate the dust adhering to the surface of the heat pipe from the heat pipe. The scraper scrapes the dust off the inner wall of the air pipe, which can effectively prevent dust from accumulating on the surface of the heat pipe and the inner wall of the air pipe, and prevent dust accumulation from affecting the heat transfer effect. Attached Figure Description

[0013] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure from another angle of the present invention; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 for Figure 3 Enlarged view at point B in the middle; In the diagram: 1. Heating element; 2. Exhaust pipe; 3. Smoke outlet pipe; 4. Heat-conducting plate; 5. Air guide pipe; 6. Support plate; 7. Support rod; 8. Support block; 9. Spring; 10. Limiting block; 11. Scraper; 12. Conical block; 13. Heat-conducting element; 14. Water inlet pipe; 15. Water outlet pipe; 16. Motor; 17. Rotating shaft; 18. Scraper rod; 19. External thread; 20. Threaded pipe; 21. Cleaning ring; 22. Connecting rod; 23. Conical pipe; 24. Slag discharge pipe; 25. Gap; 26. Cleaning rod; Detailed Implementation

[0014] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings: Example

[0015] like Figures 1 to 4As shown, this embodiment discloses a kiln waste heat recovery device, including a heating pipe 1. The bottom of the heating pipe 1 is connected to the flue pipe 2, and the top of the heating pipe 1 is fixed with a flue pipe 3. A heat-conducting plate 4 is fixed inside the heating pipe 1. A heat-conducting pipe 13 is fixed inside the heating pipe 1 below the heat-conducting plate 4. The heat-conducting pipe 13 is spirally arranged inside the heating pipe 1. A water inlet pipe 14 is fixed to the bottom of the heat-conducting pipe 13. The top of the heat-conducting pipe 13 is connected to the heat-conducting plate 4. The heat-conducting plate 4 is connected to a water pump through a water outlet pipe 15. Air guide pipes 5 are also evenly fixed on the heat-conducting plate 4, penetrating the heat-conducting plate 4. A support plate 6 is provided below each air guide pipe 5. A support rod 7 is provided on the support plate 6, penetrating the support plate 6 and slidably connected to the support plate 6. A support block is fixed on the support rod 7 above the support plate 6. 8. Springs 9 are fixed between the support block 8 and the support plate 6. A scraper 11 that mates with the inner wall of the air guide pipe 5 is fixed on the support rod 7. A conical block 12 is fixed on the top of the support rod 7. A motor 16 is also fixed on the heating tube 1. A rotating shaft 17 is fixed at the output end of the motor 16. A scraper 18 is also fixed on the rotating shaft 17 above the heat conduction plate 4. An external thread 19 is also fixed on the rotating shaft 17 at the position of the heat conduction tube 13. A threaded tube 20 that is threadedly connected to the external thread 19 is provided on the rotating shaft 17 at the position of the external thread 19. A positioning rod is also fixed inside the heating tube 1. The positioning rod passes through the threaded tube 20 and is slidably connected to the threaded tube 20. A cleaning ring 21 is also fitted on the heat conduction tube 13. The cleaning ring 21 is connected to the threaded tube 20 through a connecting rod 22.Flue gas enters the heating tube 1 through the exhaust pipe 2 and is then discharged through the exhaust pipe 3. While in the heating tube 1, the flue gas is pumped out by a water pump. Clean water enters the heat conduction tube 13 through the water inlet pipe 14. After heat exchange between the clean water and the flue gas in the heat conduction tube 13, the heated clean water enters the heat conduction plate 4. The flue gas passes through each air guide pipe 5 and then exchanges heat again with the clean water in the heat conduction plate 4. After that, the flue gas is discharged through the exhaust pipe 3, and the heated water is discharged for use through the water outlet pipe 15. After the flue gas has been discharged for a period of time, the rotating shaft 17 is driven by the motor 16 to rotate. The scraper 18 rotates with the rotating shaft 17. When the scraper 18 rotates, it contacts the conical block 12 and pushes the conical block 12 downward. The support rod 7 descends with the conical block 12, and the scraper 11 descends with the support rod 7. When the scraper 11 descends, it scrapes the inner wall of the air duct 5, scraping off the dust adhering to the inner wall of the air duct 5. After the dust separates from the inner wall of the air duct 5, it falls off. After the scraper 18 separates from the conical block 12, the spring 9 pushes the conical block 12 upward, and the scraper 11 rises again to scrape off the dust. The conical block 12 returns to its original position. Initially positioned, and as the rotating shaft 17 rotates, the external thread 19 is threadedly connected to the threaded tube 20, and the positioning rod passes through and slides through the threaded tube 20. As the rotating shaft 17 rotates, the threaded tube 20 moves in the direction of the rotating shaft 17, and the cleaning ring 21 moves with the threaded tube 20. Because the connecting tube is rotatably connected to the threaded tube 20, the cleaning ring 21 moves on the heat pipe 13. The cleaning ring 21 separates the dust adhering to the surface of the heat pipe 13 from the heat pipe 13. The cleaning ring 21 moves from the upper end of the heat pipe 13. After sliding to the lower end of the heat pipe 13, the motor 16 drives the rotating shaft 17 to rotate in the opposite direction, and the threaded tube 20 rises back to the initial position. After the flue gas and clean water exchange heat for a period of time, the cleaning ring 21 is driven by the motor 16 to slide on the surface of the heat pipe 13, separating the dust attached to the surface of the heat pipe 13 from the heat pipe 13. The scraper 11 scrapes the inner wall of the air duct 5 to remove the dust from the inner wall of the air duct 5. This can effectively prevent dust from accumulating on the surface of the heat pipe 13 and the inner wall of the air duct 5, and prevent dust accumulation from affecting the heat transfer effect.

[0016] Among them, a limit block 10 is fixed on the support rod 7 below the support plate 6.

[0017] The scraper 11 is spirally arranged inside the air guide pipe 5.

[0018] The scraper 18 has an arc-shaped structure, and there is a gap 25 between the heat-conducting plate 4 and the heating tube 1. A cleaning rod 26 is also fixed on the scraper 18 at the gap 25. When the scraper 18 rotates, it pushes the dust attached to the upper surface of the heat-conducting plate 4 to the gap 25. The cleaning rod 26 can effectively prevent dust from accumulating at the gap 25. The dust falls through the gap 25 to the bottom of the heating tube 1 for collection and treatment.

[0019] One end of the connecting rod 22 is fixed to the connecting pipe, the connecting pipe is sleeved on the surface of the threaded pipe 20 and rotatably connected to the threaded pipe 20, and the other end of the connecting rod 22 is rotatably connected to the cleaning pipe. Example

[0020] This embodiment discloses a kiln waste heat recovery device. Based on the structure and principle of Embodiment 1, the heating tube 1 in this embodiment has a conical tube 23 fixed at its bottom, and a slag discharge pipe 24 is fixed at the bottom of the conical tube 23. Two valves are fixed on the slag discharge pipe 24. After dust falls onto the conical tube 23, it accumulates at the slag discharge pipe 24. First, the valve at the top of the slag discharge pipe 24 is opened, and the dust falls into the slag discharge pipe 24 between the two valves. Then, the upper valve is closed, and the lower valve is opened, allowing the dust to be discharged and collected through the slag discharge pipe 24. This avoids the flue gas from being discharged through the slag discharge pipe 24 when the dust is discharged.

[0021] The above are merely preferred embodiments of the present invention. It should be noted that, for those skilled in the art, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the technical principles of the present invention. These changes, modifications, substitutions and variations should also be considered within the scope of protection of the present invention.

Claims

1. A waste heat recovery device for kilns, characterized in that, The device includes a heating element, the bottom of which is connected to a flue pipe, and a flue outlet pipe fixed to the top of the heating element. A heat-conducting plate is fixed inside the heating element, and another heat-conducting pipe is fixed inside the heating element below the heat-conducting plate. The heat-conducting pipes are spirally arranged inside the heating element, and a water inlet pipe is fixed to the bottom of each heat-conducting pipe. The top of each heat-conducting pipe is connected to the heat-conducting plate, and the heat-conducting plate is connected to a water pump via a water outlet pipe. Air guide pipes are also evenly fixed to the heat-conducting plate, penetrating it. A support plate is provided below each air guide pipe, and a support rod is provided on the support plate, penetrating and slidably connected to it. A support block is fixed to the support rod above the support plate. Springs are fixed between the support block and the support plate. A scraper that mates with the inner wall of the air guide pipe is fixed on the support rod. A conical block is fixed on the support rod. A motor is also fixed on the heating tube. A rotating shaft is fixed at the output end of the motor. A scraper is also fixed on the rotating shaft above the heat-conducting plate. An external thread is fixed on the rotating shaft at the position of the heat-conducting tube. A threaded tube that is threadedly connected to the external thread is provided on the rotating shaft at the position of the external thread. A positioning rod is also fixed inside the heating tube. The positioning rod passes through the threaded tube and is slidably connected to the threaded tube. A cleaning ring is also fitted on the heat-conducting tube. The cleaning ring is connected to the threaded tube through a connecting rod.

2. The kiln waste heat recovery device according to claim 1, characterized in that: A limit block is fixed on the support rod below the support plate.

3. The kiln waste heat recovery device according to claim 1, characterized in that: The scraper spiral is installed inside the air guide pipe.

4. The kiln waste heat recovery device according to claim 1, characterized in that: The scraper has an arc-shaped structure, and there is a gap between the heat-conducting plate and the heating tube. A cleaning rod is also fixed on the scraper at the gap position.

5. The kiln waste heat recovery device according to claim 1, characterized in that: One end of the connecting rod is fixed to the connecting pipe, the connecting pipe is sleeved on the surface of the threaded pipe and rotatably connected to the threaded pipe, and the other end of the connecting rod is rotatably connected to the cleaning pipe.

6. The kiln waste heat recovery device according to claim 1, characterized in that: The bottom of the heating tube is fixed with a conical tube, the bottom of the conical tube is fixed with a slag discharge pipe, and two valves are fixed on the slag discharge pipe.

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