An air preheating device for industrial boilers

Abstract

The present invention provides an air preheating device for an industrial boiler, which relates to the technical field of air preheating. The device comprises a device shell, a preheater main body is arranged inside the device shell, two supporting bases are arranged at the lower end of the device shell, and a dust suction mechanism is arranged at the lower end of the device shell, comprising a fixing frame, a dust suction fan and a screen. The fixing frame is fixedly connected to the lower end of the device shell. When dust adheres to the surface of the preheater main body, the dust suction fan is started to absorb the dust on the surface of the preheater main body. At this time, the dust is separated from the surface of the preheater main body under the suction force generated by the dust suction fan and flows toward the screen in the fixing frame until the dust stays on the surface of the screen. At this time, the dust adhered to the preheater main body is reduced, the heat exchange efficiency of the preheater main body is effectively improved, the energy consumption is reduced, the service life thereof is extended, and at the same time, the risk of failure caused by dust accumulation is reduced, thereby ensuring the stable operation of the industrial boiler.

Description

Technical Field

[0001] The present invention belongs to the technical field of air preheating, and more particularly, relates to an air preheating device for industrial boilers. Background Art

[0002] The air preheating device used in industrial boilers is an important equipment that can effectively improve the operating efficiency and performance of industrial boilers. Its main function is to use the waste heat of the flue gas at the tail end of the boiler to heat the air entering the boiler. Through this preheating process, on the one hand, it can improve the combustion efficiency, make the fuel and hot air more fully mixed and burned, release more energy, thereby improving the thermal efficiency of the boiler and reducing energy consumption; on the other hand, it can reduce the exhaust temperature, reduce the heat loss carried away by the flue gas, improve energy utilization, and at the same time reduce thermal pollution to the environment. In addition, the air preheating device can also improve the combustion conditions to a certain extent, make the combustion process more stable, and contribute to the safe and efficient operation of industrial boilers.

[0003] However, during the implementation of the above technical solution, at least the following technical problems were found:

[0004] In industrial environments, the atmosphere itself contains a certain amount of dust particles, which will gradually deposit on the surface of the pipe as the air flows. Dust has poor thermal conductivity and adheres to the surface of the pipe, which is equivalent to forming a layer of insulation, hindering the heat transfer from the pipe to the outside, resulting in poor air preheating effect and reduced overall thermal efficiency of the boiler. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides an air preheating device for an industrial boiler to solve the above problems.

[0006] An air preheating device for an industrial boiler comprises a device shell, a preheater body is arranged inside the device shell, two support bases are arranged at the lower end of the device shell, and an ash suction mechanism is arranged at the lower end of the device shell, comprising a fixed frame, an ash suction fan and a screen. The fixed frame is fixedly connected to the lower end of the device shell, the ash suction fan is fixedly connected to the lower end of the fixed frame, the screen is located in the fixed frame, and four supporting short plates are fixedly connected to the inner wall of the fixed frame. The four supporting short plates are all located at the lower end of the screen, and the four supporting short plates are all located at the four corners of the screen, and the screen is placed at the upper end of the four supporting short plates.

[0007] Preferably, the upper ends of the four supporting short plates are provided with thread grooves, and the four corners are provided with holes corresponding to the positions of the thread grooves. Four nuts are provided at the upper end of the screen, and the four nuts correspond to the positions of the four supporting short plates. The four nuts pass through the holes and are threadedly connected to the corresponding supporting short plates.

[0008] Preferably, two mutually parallel threaded rods are provided at the upper end of the screen, both ends of the two threaded rods are rotatably connected to fixed plates, and the side ends of each fixed plate are fixedly connected to the inner wall of the fixed frame.

[0009] Preferably, a cross bar is provided at the upper end of the screen, both ends of the cross bar are threadedly connected to the two threaded rods, the lower end of the cross bar is fixedly connected to a connecting long plate, both ends of the connecting long plate are fixedly connected to scrapers, and the lower ends of the two scrapers are movably connected to the upper surface of the screen.

[0010] Preferably, the front and rear ends of the fixed frame are fixedly connected to the collection frame, and the two collection frames are provided with openings on the side facing the fixed frame. The inner wall of each collection frame is rotatably connected to two parallel connecting rods, and the four connecting rods correspond to the positions of the four fixed plates. Each connecting rod passes through the corresponding fixed plate and is fixedly connected to the two ends of the two threaded rods.

[0011] Preferably, door panels are hinged at opposite ends of the two collecting frames.

[0012] Preferably, a synchronization chain is provided at one end of the collection frame located at the rear side, and both ends of the synchronization chain are meshed and connected with sprockets. The center points of the two sprockets are fixedly connected to rotating columns, and the two rotating columns are rotatably connected to the collection frame at the rear end. The front surfaces of the two rotating columns pass through the collection frame at the rear end and are fixedly connected to the corresponding connecting rods.

[0013] Preferably, a U-shaped support plate is provided at one end of the rotating column located at the right end, the U-shaped support plate is fixedly connected to the rear surface of the collection frame, the rear surface of the U-shaped support plate is fixedly connected to a motor, and the output port of the motor passes through the U-shaped support plate and is fixedly connected to the corresponding rotating column.

[0014] Preferably, rectangular grooves are provided inside the two support bases, and cylinders are provided inside the two support bases. The lower ends of the two cylinders are fixedly connected to the inner walls of the support bases, and the output ports of the two cylinders are fixedly connected to lifting blocks. The lifting blocks are movably connected to the corresponding support bases, and the upper ends of the two lifting blocks are fixedly connected to the lower end of the fixed frame.

[0015] Preferably, both ends of the two lifting blocks are provided with limiting sliding grooves, each lifting block is slidably connected to two limiting blocks through the limiting sliding grooves, and each limiting block is fixedly connected to the inner wall of the corresponding support base.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the present invention, when dust adheres to the surface of the preheater main body, the dust suction fan is started, and the dust suction fan absorbs the dust on the surface of the preheater main body. At this time, the dust is separated from the surface of the preheater main body under the suction force generated by the dust suction fan, and flows toward the screen in the fixed frame until the dust stays on the surface of the screen. At this time, the dust adhered to the preheater main body is reduced, which effectively improves the heat exchange efficiency of the preheater main body, reduces energy consumption, and extends its service life. At the same time, the risk of failure caused by dust accumulation is reduced, thereby ensuring the stable operation of the industrial boiler.

[0018] In the present invention, when dust adheres to the screen, the motor is started, and the motor drives the two rotating columns to rotate through the sprocket and the synchronous chain, and the two rotating columns drive the two connecting rods and the two threaded rods to rotate. Since the cross bar threaded on the threaded rod does not rotate with the rotation of the threaded rod, the cross bar will drive the connecting long plate to move. At this time, the scraper will also scratch the dust on the surface of the screen with the movement of the connecting long plate. By controlling the positive direction output of the motor, the dust on the screen is pushed into the collection frame at both ends of the fixed frame. When the screen accumulates dust, the motor drives the relevant components to make the scraper clean the dust to the collection frame, effectively preventing the screen from being blocked, ensuring the stable operation of the dust suction mechanism, and then maintaining efficient dust cleaning of the preheater main body, thereby improving the performance and reliability of the entire air preheating device.

[0019] In the present invention, the U-shaped support plate provides stable support for the motor, avoiding displacement or shaking of the motor due to vibration during startup. The motor will generate a large impact force and vibration at the moment of startup. Without the firm support of the U-shaped support plate, the motor may deviate, affecting the stability of its connection with the rotating column, and may even cause the connection part to loosen or be damaged. The U-shaped support plate can firmly fix the motor, enable it to run stably, ensure the precise movement of components such as the rotating column driven by the sprocket and the synchronous chain, ensure the smooth progress of the screen cleaning work, extend the overall service life of the equipment, and reduce the occurrence rate of failures.

[0020] In the present invention, the purpose of controlling the height of the air preheating device can be achieved by controlling the cylinder to push the lifting block up and down, so that the connection ports at both ends of the device shell can be adjusted to different height areas. This design greatly enhances the flexibility and adaptability of the device, and can easily connect to pipes or equipment at different heights, effectively reducing the difficulty of installation, improving work efficiency, and meeting diverse industrial production needs.

[0021] In the present invention, during the lifting process of the lifting block, the limit block will limit the lifting block, and the limit block is slidably connected to the limit slide grooves opened at both ends of the lifting block. This limit structure can ensure that the lifting block can perform stable lifting and lowering movements along a predetermined trajectory under the push of the cylinder, avoiding the lifting block from deflecting, shaking, etc. during the movement, thereby ensuring the accuracy and stability of the height adjustment of the entire air preheating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0023] Figure 2 It is a structural schematic diagram of the preheater main body of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the fixing frame of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the screen of the present invention;

[0026] Figure 5 It is a structural diagram of the collection frame of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the lifting block of the present invention.

[0028] In the figure, the correspondence between the component names and the drawing numbers is: 11. Device housing; 12. Fixed frame; 13. Ash suction fan; 14. Support base; 15. Preheater body; 16. Collection frame; 17. Threaded rod; 18. Screen; 19. Fixed plate; 20. Door panel; 21. Synchronous chain; 22. Motor; 23. Cross bar; 24. Scraper; 25. Support short plate; 26. Nut; 27. Hole; 28. Connecting long plate; 29. ​​Connecting rod; 30. Sprocket; 31. Rotating column; 32. U-shaped support plate; 33. Lifting block; 34. Rectangular groove; 35. Cylinder; 36. Limit block; 37. Limit slide. DETAILED DESCRIPTION

[0029] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0030] See also Figures 1-6The present invention provides an air preheating device for an industrial boiler, comprising a device casing 11, a preheater body 15 is arranged inside the device casing 11, two supporting bases 14 are arranged at the lower end of the device casing 11, and an ash suction mechanism is arranged at the lower end of the device casing 11, comprising a fixed frame 12, an ash suction fan 13 and a screen 18, the fixed frame 12 is fixedly connected to the lower end of the device casing 11, the ash suction fan 13 is fixedly connected to the lower end of the fixed frame 12, the screen 18 is located in the fixed frame 12, and four supporting short plates 25 are fixedly connected to the inner wall of the fixed frame 12, the four supporting short plates 25 are all located at the lower end of the screen 18, and the four supporting short plates 25 are all located at the four corners of the screen 18, the screen 18 is placed on the upper ends of the four supporting short plates 25, the upper ends of the four supporting short plates 25 are all provided with threaded grooves, and the four corners of the screen 18 are all provided with screw threads. The holes 27 corresponding to the positions of the thread grooves and the upper end of the screen 18 are provided with four nuts 26, and the four nuts 26 all correspond to the positions of the four supporting short plates 25. The four nuts 26 all pass through the holes 27 and are threadedly connected to the corresponding supporting short plates 25. When dust adheres to the surface of the preheater body 15, the dust suction fan 13 is started, and the dust suction fan 13 absorbs the dust on the surface of the preheater body 15. At this time, the dust is separated from the surface of the preheater body 15 under the suction force generated by the dust suction fan 13 and flows toward the screen 18 in the fixed frame 12 until the dust stays on the surface of the screen 18. At this time, the dust attached to the preheater body 15 is reduced, which effectively improves the heat exchange efficiency of the preheater body 15, reduces energy consumption, and extends its service life. At the same time, it reduces the risk of failure caused by dust accumulation, thereby ensuring the stable operation of the industrial boiler.

[0031] The upper end of the screen 18 is provided with two threaded rods 17 parallel to each other, and both ends of the two threaded rods 17 are rotatably connected to a fixed plate 19. The side ends of each fixed plate 19 are fixedly connected to the inner wall of the fixed frame 12. The upper end of the screen 18 is provided with a cross bar 23, and both ends of the cross bar 23 are threadedly sleeved with the two threaded rods 17. The lower end of the cross bar 23 is fixedly connected to a connecting long plate 28, and both ends of the connecting long plate 28 are fixedly connected to a scraper 24. The lower ends of the two scrapers 24 are movably connected to the upper surface of the screen 18. When dust adheres to the screen 18, the motor 22 is started, and the motor 22 drives the two rotating columns 31 to rotate through the sprocket 30 and the synchronous chain 21. The two rotating columns 31 drive the two connecting rods 29 and The two threaded rods 17 rotate. Since the cross bar 23 threadedly connected to the threaded rod 17 does not rotate with the rotation of the threaded rod 17, the cross bar 23 will drive the connecting long plate 28 to move. At this time, the scraper 24 will also scrape the dust on the surface of the screen 18 with the movement of the connecting long plate 28. By controlling the positive direction output of the motor 22, the dust on the screen 18 is pushed into the collecting frame 16 at both ends of the fixed frame 12. When the screen 18 accumulates dust, the motor 22 drives the relevant components to make the scraper 24 clean the dust to the collecting frame 16, effectively preventing the screen 18 from being blocked, ensuring the stable operation of the dust suction mechanism, and then maintaining the efficient cleaning of the preheater body 15, thereby improving the performance and reliability of the entire air preheating device.

[0032] The front and rear ends of the fixed frame 12 are fixedly connected with the collection frame 16. The two collection frames 16 are provided with an opening on one side facing the fixed frame 12. The inner wall of each collection frame 16 is rotatably connected to two mutually parallel connecting rods 29. The four connecting rods 29 correspond to the positions of the four fixed plates 19. Each connecting rod 29 passes through the corresponding fixed plate 19 and is fixedly connected to the two ends of the two threaded rods 17. The ends of the two collection frames 16 that are away from each other are hinged with a door panel 20. The U-shaped support plate 32 provides a stable support for the motor 22 to avoid the motor 22 from starting. When the motor 22 is started, it will generate displacement or shaking due to vibration. If it is not firmly supported by the U-shaped support plate 32, the motor 22 may be offset, affecting the stability of its connection with the rotating column 31, and may even cause the connection part to become loose or damaged. The U-shaped support plate 32 can firmly fix the motor 22, so that it can run stably, ensuring that the rotating column 31 and other components are driven to move accurately through the sprocket 30 and the synchronous chain 21, ensuring the smooth cleaning of the screen 18, extending the overall service life of the equipment, and reducing the occurrence rate of failures.

[0033] The lifting of the lifting block 33 is achieved by the lifting of the lifting rod 31 and the lifting of the lifting block 33.

[0034] The two support bases 14 are provided with rectangular grooves 34, and the two support bases 14 are provided with cylinders 35 inside. The lower ends of the two cylinders 35 are fixedly connected to the inner wall of the support base 14, and the output ports of the two cylinders 35 are fixedly connected to the lifting blocks 33. The lifting blocks 33 are movably connected to the corresponding support bases 14. The upper ends of the two lifting blocks 33 are fixedly connected to the lower end of the fixed frame 12. Both ends of the two lifting blocks 33 are provided with limited sliding grooves 37. Each lifting block 33 is slidably connected to two limiting sliding grooves 37. Block 36, each limit block 36 is fixedly connected to the inner wall of the corresponding support base 14. During the lifting process of the lifting block 33, the limit block 36 will limit the lifting block 33. The limit block 36 is slidably connected to the limit slide groove 37 opened at both ends of the lifting block 33. This limit structure can ensure that the lifting block 33 is pushed by the cylinder 35 to perform stable lifting and lowering movement along the predetermined trajectory, avoiding the lifting block 33 from deflecting, shaking, etc. during the movement, thereby ensuring the accuracy and stability of the height adjustment of the entire air preheating device.

[0035] Working principle:

[0036] In the first step, when dust adheres to the surface of the preheater body 15, the dust suction fan 13 is started. The dust suction fan 13 absorbs the dust on the surface of the preheater body 15. At this time, the dust is separated from the surface of the preheater body 15 under the suction force generated by the dust suction fan 13 and flows toward the screen 18 in the fixed frame 12 until the dust stays on the surface of the screen 18. At this time, the dust attached to the preheater body 15 is reduced, which effectively improves the heat exchange efficiency of the preheater body 15, reduces energy consumption, and extends its service life. At the same time, it reduces the risk of failure caused by dust accumulation, thereby ensuring the stable operation of the industrial boiler.

[0037] In the second step, when dust adheres to the screen 18, the motor 22 is started. The motor 22 drives the two rotating columns 31 to rotate through the sprocket 30 and the synchronous chain 21. The two rotating columns 31 drive the two connecting rods 29 and the two threaded rods 17 to rotate. Since the cross bar 23 threadedly connected to the threaded rod 17 does not rotate with the rotation of the threaded rod 17, the cross bar 23 will drive the connecting long plate 28 to move. At this time, the scraper 24 will also scrape the dust on the surface of the screen 18 with the movement of the connecting long plate 28. By controlling the positive direction output of the motor 22, the dust on the screen 18 is pushed into the collecting frame 16 at both ends of the fixed frame 12. When dust accumulates on the screen 18, the motor 22 drives the relevant components to make the scraper 24 clean the dust to the collecting frame 16, effectively preventing the screen 18 from being blocked, ensuring the stable operation of the dust suction mechanism, and then maintaining the efficient cleaning of the preheater body 15, thereby improving the performance and reliability of the entire air preheating device.

[0038] In the third step, the U-shaped support plate 32 provides stable support for the motor 22, preventing the motor 22 from being displaced or shaken due to vibration during startup. The motor 22 will generate a large impact force and vibration at the moment of startup. Without the stable support of the U-shaped support plate 32, the motor 22 may be offset, affecting the stability of its connection with the rotating column 31, and may even cause the connection part to become loose or damaged. The U-shaped support plate 32 can firmly fix the motor 22, making it run stably, ensuring that the rotating column 31 and other components are driven to move accurately through the sprocket 30 and the synchronous chain 21, ensuring the smooth cleaning of the screen 18, extending the overall service life of the equipment, and reducing the occurrence rate of failures.

[0039] In the fourth step, the purpose of controlling the height of the air preheating device can be achieved by controlling the cylinder 35 to push the lifting block 33 up and down, so that the connection ports at both ends of the device shell 11 can be adjusted to different height areas. This design greatly enhances the flexibility and adaptability of the device, and can easily connect to pipes or equipment at different heights, effectively reducing the difficulty of installation, improving work efficiency, and meeting diverse industrial production needs.

[0040] In the fifth step, during the lifting and lowering process of the lifting block 33, the limit block 36 will limit the lifting block 33. The limit block 36 is slidably connected to the limit slide groove 37 opened at both ends of the lifting block 33. This limit structure can ensure that the lifting block 33 is pushed by the cylinder 35 to perform stable lifting and lowering movements along a predetermined trajectory, avoiding the lifting block 33 from deflecting, shaking, etc. during the movement, thereby ensuring the accuracy and stability of the height adjustment of the entire air preheating device.

[0041] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. An air preheating device for an industrial boiler, comprising a device housing (11), a preheater body (15) disposed inside the device housing (11), and two supporting bases (14) disposed at the lower end of the device housing (11), characterized in that: A dust suction mechanism is provided at the lower end of the device housing (11), comprising a fixing frame (12), a dust suction fan (13) and a screen (18); The fixing frame (12) is fixedly connected to the lower end of the device housing (11), the dust suction fan (13) is fixedly connected to the lower end of the fixing frame (12), the screen (18) is located in the fixing frame (12), and the inner wall of the fixing frame (12) is fixedly connected with four supporting short plates (25), the four supporting short plates (25) are all located at the lower end of the screen (18), and the screen (18) is placed on the upper end of the four supporting short plates (25); The upper ends of the four supporting short plates (25) are provided with thread grooves, and the four corners of the screen (18) are provided with holes (27) corresponding to the positions of the thread grooves. The upper end of the screen (18) is provided with four nuts (26), and the four nuts (26) are threadedly connected to the corresponding supporting short plates (25) through the holes (27); The upper end of the screen (18) is provided with two mutually parallel threaded rods (17), both ends of the two threaded rods (17) are rotatably connected to fixed plates (19), and the side end of each fixed plate (19) is fixedly connected to the inner wall of the fixed frame (12). The upper end of the screen (18) is provided with a cross bar (23), both ends of the cross bar (23) are threadedly sleeved with the two threaded rods (17), the lower end of the cross bar (23) is fixedly connected to a connecting long plate (28), and both ends of the connecting long plate (28) are fixedly connected to a scraper (24), and the lower ends of the two scrapers (24) are movably connected to the upper surface of the screen (18); The front and rear ends of the fixed frame (12) are fixedly connected to the collecting frames (16), and the two collecting frames (16) are provided with openings on the sides facing the fixed frame (12). The inner wall of each collecting frame (16) is rotatably connected to two mutually parallel connecting rods (29), and each connecting rod (29) passes through the corresponding fixing plate (19) and is fixedly connected to the two ends of the two threaded rods (17).

2. An air preheating device for an industrial boiler according to claim 1, characterized in that: The two collecting frames (16) are both hingedly connected to door panels (20) at their opposite ends.

3. An air preheating device for an industrial boiler as claimed in claim 2, characterized in that: A synchronous chain (21) is provided at one end of the collecting frame (16) at the rear side, and both ends of the synchronous chain (21) are meshedly connected with sprockets (30); The center points of the two sprockets (30) are fixedly connected to a rotating column (31), the two rotating columns (31) are rotatably connected to the collection frame (16) at the rear end, and the front surfaces of the two rotating columns (31) pass through the collection frame (16) at the rear end and are fixedly connected to the corresponding connecting rods (29).

4. An air preheating device for an industrial boiler as claimed in claim 3, characterized in that: A U-shaped support plate (32) is provided at one end of the rotating column (31) at the right end, and the U-shaped support plate (32) is fixedly connected to the rear surface of the collecting frame (16); The rear surface of the U-shaped support plate (32) is fixedly connected to a motor (22), and an output port of the motor (22) passes through the U-shaped support plate (32) and is fixedly connected to a corresponding rotating column (31).

5. An air preheating device for an industrial boiler as claimed in claim 4, characterized in that: A rectangular groove (34) is provided inside the two support bases (14), and a cylinder (35) is provided inside the two support bases (14). The lower ends of the two cylinders (35) are fixedly connected to the inner wall of the support base (14); The output ports of the two cylinders (35) are fixedly connected to the lifting blocks (33), the lifting blocks (33) are movably connected to the corresponding support bases (14), and the upper ends of the two lifting blocks (33) are fixedly connected to the lower end of the fixed frame (12).

6. An air preheating device for an industrial boiler as claimed in claim 5, characterized in that: Both ends of the two lifting blocks (33) are provided with limiting sliding grooves (37), and each lifting block (33) is slidably connected to two limiting blocks (36) via the limiting sliding grooves (37); Each of the limit blocks (36) is fixedly connected to the inner wall of the corresponding support base (14).

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