Ash guide pipe for fluidized bed boiler
By introducing a filter screen and heat transfer pipe structure into the ash guide pipe of a fluidized bed boiler, the problem of heat waste is solved, heat recovery and utilization are realized, and the ash guide pipe is cleaned efficiently, thereby improving resource utilization and cleaning efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2026-03-03
AI Technical Summary
In fluidized bed boilers, the direct discharge of heat from dust and flue gas leads to resource waste, and existing ash guide pipes fail to effectively utilize the heat.
A dust guide pipe structure with a filter screen and a heat transfer pipe was designed. The filter screen filters dust and introduces some gas into the heat transfer pipe, carrying heat back to the boiler. Combined with a rotary motor-driven knocking ball and cleaning brush, dust is removed to prevent blockage. A heat insulation coating is set inside the heat transfer pipe to reduce heat loss.
It enables the reuse of heat, improves resource utilization, and ensures the normal operation of the ash guide pipe through the cleaning device, reducing dust adhesion and lowering the cleaning frequency.
Smart Images
Figure CN223965386U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ash guide pipe technology, specifically an ash guide pipe for fluidized bed boilers. Background Technology
[0002] A fluidized bed boiler is a type of boiler that uses fluidized bed combustion. It features clean combustion and strong fuel adaptability. Its working principle involves solid particles forming a liquid-like state under the influence of gas flow, thereby achieving complete fuel combustion. This combustion method ensures thorough mixing of fuel and air, improving combustion efficiency and reducing pollutant emissions. Ash discharge pipes are used to facilitate the removal of ash and pollutants generated during boiler combustion.
[0003] However, during the process of using dust guide pipes to discharge dust and other substances, the dust and flue gas still contain a lot of heat. If they are discharged directly, the heat will be lost to the outside world, which can easily lead to a waste of resources. Utility Model Content
[0004] The purpose of this invention is to provide an ash guide pipe for a fluidized bed boiler to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an ash guide pipe for a fluidized bed boiler, comprising an ash guide pipe, a branch pipe fixedly connected to the left side of the ash guide pipe, a first flange fixedly connected to the side of the branch pipe away from the ash guide pipe, a second flange provided on the side of the first flange away from the branch pipe, an installation groove provided in the middle of both the second flange and the first flange, a filter screen provided inside the installation groove, a sealing gasket provided between the second flange and the first flange, a connecting bolt slidably connected inside the sealing gasket, a nut threadedly connected to the surface of the connecting bolt, and a heat transfer pipe fixedly connected to the side of the second flange away from the first flange.
[0006] As a further preferred embodiment of this technical solution, the first flange and the second flange are provided with a plurality of mounting holes in the middle, the connecting bolts are located inside the mounting holes, the sealing gasket is made of rubber, and the heat transfer pipe is provided with a heat insulation coating inside.
[0007] As a further preferred embodiment of this technical solution, a rotary motor is fixedly connected to the top end of the heat transfer pipe, a connecting shaft is fixedly connected to the output end of the rotary motor, and a striking ball is fixedly connected to the surface of the connecting shaft.
[0008] As a further preferred embodiment of this technical solution, a first bevel gear is fixedly sleeved on the surface of the connecting shaft, a second bevel gear meshes with the top of the first bevel gear, a connecting rod is fixedly connected to the side of the second bevel gear away from the connecting shaft, a cleaning brush is fixedly connected to the side of the connecting rod away from the second bevel gear, and a positioning plate is rotatably connected to the surface of the connecting rod.
[0009] As a further preferred embodiment of this technical solution, the cleaning brush is in contact with the filter screen, the positioning plate is fixedly connected to the heat transfer pipe, and the positioning plate is located between the cleaning brush and the second bevel gear.
[0010] As a further preferred embodiment of this technical solution, a drive motor is fixedly connected to the top end of the ash guide pipe, a convex rib plate is fixedly sleeved on the output shaft of the drive motor, an adjusting rod is fixedly connected to the top end of the ash guide pipe, a return spring is movably sleeved on the surface of the adjusting rod, a top plate is fixedly connected to the top end of the adjusting rod, and a striking rod is fixedly connected to the bottom end of the top plate.
[0011] As a further preferred embodiment of this technical solution, the convex rib plate is located at the bottom of the top plate, and there are two adjusting rods, each consisting of multiple sleeve rods. The striking rod is made of polyethylene.
[0012] This utility model provides an ash guide pipe for a fluidized bed boiler, which has the following beneficial effects:
[0013] (1) This utility model installs the filter screen in the mounting groove on the first flange and the second flange, places the sealing gasket between the first flange and the second flange, aligns the mounting holes of the two flanges, inserts the connecting bolts into the mounting holes, and uses nuts to fix the positions of the first flange and the second flange. The other side of the heat transfer pipe is connected to the boiler through the flange. When ash is discharged, some gas enters the heat transfer pipe through the diversion pipe and carries the heat back to the boiler, thereby realizing the reuse of heat and improving the utilization rate of resources.
[0014] (2) By starting the rotating motor, the connecting shaft drives the striking ball to rotate, thereby striking the filter screen and causing it to vibrate, which causes the dust attached to its surface to fall off. At the same time, the first bevel gear rotates with the connecting shaft, and the second bevel gear drives the connecting rod to rotate, and the cleaning brush rotates on the filter screen to remove the dust that has not fallen off, thereby ensuring the normal operation of the filter screen. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the filter screen and heat transfer pipe structure of this utility model;
[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of the heat transfer pipe of this utility model;
[0018] Figure 4 This is a schematic diagram of the diversion tube and striking rod structure of this utility model.
[0019] In the diagram: 1. Ash guide pipe; 2. Diverter pipe; 3. First flange; 4. Second flange; 5. Mounting groove; 6. Filter screen; 7. Sealing gasket; 8. Connecting bolt; 9. Nut; 10. Heat transfer pipe; 11. Rotary motor; 12. Connecting shaft; 13. Striking ball; 14. First bevel gear; 15. Second bevel gear; 16. Connecting rod; 17. Cleaning brush; 18. Positioning plate; 19. Drive motor; 20. Raised rib plate; 21. Adjusting rod; 22. Return spring; 23. Top plate; 24. Striking rod. Detailed Implementation
[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0021] This utility model provides a technical solution: such as Figure 1 and Figure 4 As shown in this embodiment, an ash guide pipe for a fluidized bed boiler includes an ash guide pipe 1. A diversion pipe 2 is fixedly connected to the left side of the ash guide pipe 1. A first flange 3 is fixedly connected to the side of the diversion pipe 2 away from the ash guide pipe 1. A second flange 4 is provided on the side of the first flange 3 away from the diversion pipe 2. An installation groove 5 is provided in the middle of both the second flange 4 and the first flange 3. A filter screen 6 is provided inside the installation groove 5. A sealing gasket 7 is provided between the second flange 4 and the first flange 3. A connecting bolt 8 is slidably connected inside the sealing gasket 7. A nut 9 is threadedly connected to the surface of the connecting bolt 8. A heat transfer pipe 10 is fixedly connected to the side of the second flange 4 away from the first flange 3.
[0022] By installing the filter screen 6 in the mounting groove 5 on the first flange 3 and the second flange 4, and placing the sealing gasket 7 between the first flange 3 and the second flange 4 to align the mounting holes of the two flanges, inserting the connecting bolt 8 into the mounting hole, and fixing the position of the first flange 3 and the second flange 4 with the nut 9, the other side of the heat transfer pipe 10 is connected to the boiler through the flange. When ash is discharged, some gas enters the heat transfer pipe 10 through the diversion pipe 2 and carries heat through the filter screen 6 back into the boiler, thereby realizing the reuse of heat and improving the utilization rate of resources. The filter screen 6 can block dust, and the heat insulation coating is provided inside the heat transfer pipe 10 to reduce heat loss during the return process.
[0023] The first flange 3 and the second flange 4 have multiple mounting holes in the middle. The connecting bolts 8 are located inside the mounting holes. The sealing gasket 7 is made of rubber. The heat transfer pipe 10 has a heat insulation coating inside.
[0024] A rotary motor 11 is fixedly connected to the top end of the heat transfer pipe 10, a connecting shaft 12 is fixedly connected to the output end of the rotary motor 11, and a striking ball 13 is fixedly connected to the surface of the connecting shaft 12.
[0025] A first bevel gear 14 is fixedly sleeved on the surface of the connecting shaft 12. A second bevel gear 15 meshes with the top of the first bevel gear 14. A connecting rod 16 is fixedly connected to the side of the second bevel gear 15 away from the connecting shaft 12. A cleaning brush 17 is fixedly connected to the side of the connecting rod 16 away from the second bevel gear 15. A positioning plate 18 is rotatably connected to the surface of the connecting rod 16.
[0026] By starting the rotary motor 11, the connecting shaft 12 drives the striking ball 13 to rotate, thereby striking the filter screen 6 and causing it to vibrate, which causes the dust attached to its surface to fall off. At the same time, the first bevel gear 14 rotates with the connecting shaft 12, and the second bevel gear 15 drives the connecting rod 16 to rotate, causing the cleaning brush 17 to rotate on the filter screen 6, so that the dust that has not fallen off is removed, thereby ensuring the normal operation of the filter screen 6.
[0027] The cleaning brush 17 is in contact with the filter screen 6, and the positioning plate 18 is fixedly connected to the heat transfer pipe 10. The positioning plate 18 is located between the cleaning brush 17 and the second bevel gear 15.
[0028] A drive motor 19 is fixedly connected to the top end of the ash guide pipe 1. A convex rib plate 20 is fixedly sleeved on the output shaft of the drive motor 19. An adjusting rod 21 is fixedly connected to the top end of the ash guide pipe 1. A return spring 22 is movably sleeved on the surface of the adjusting rod 21. A top plate 23 is fixedly connected to the top end of the adjusting rod 21. A striking rod 24 is fixedly connected to the bottom end of the top plate 23.
[0029] By starting the drive motor 19, the convex plate 20 is rotated. After rotating to a certain angle, it contacts the top plate 23 and lifts it upward. After the two separate, the top plate 23 vibrates under the elastic force of the return spring 22, and the striking rod 24 strikes the dust guide tube 1, reducing the adhesion of dust on its inner wall and reducing the frequency of cleaning the dust guide tube 1. The striking rod 24 is made of polyethylene, which can avoid damaging the dust guide tube 1 during the striking process.
[0030] The convex rib plate 20 is located at the bottom of the top plate 23. There are two adjusting rods 21, which are composed of multiple sleeve rods. The striking rod 24 is made of polyethylene.
[0031] This utility model provides an ash guide pipe for a fluidized bed boiler, the specific working principle of which is as follows:
[0032] In use, the filter screen 6 is installed in the mounting groove 5 on the first flange 3 and the second flange 4, and the sealing gasket 7 is placed between the first flange 3 and the second flange 4 to align the mounting holes. The connecting bolts 8 are inserted into the mounting holes, and the positions of the first flange 3 and the second flange 4 are fixed using nuts 9. The other side of the heat transfer pipe 10 is connected to the boiler through a flange. During ash discharge, the airflow carries the dust to flow in the ash guide pipe 1. At this time, the drive motor 19 is started to make the convex plate 20 rotate. After it rotates to a certain angle, it contacts the top plate 23 and lifts it upward. After the two separate, the top plate 23... The return spring 22 vibrates under its elastic force, causing the striking rod 24 to strike the dust guide pipe 1, reducing the adhesion of dust to its inner wall. At the same time, some gas enters the heat transfer pipe 10 through the diversion pipe 2, carrying heat back into the boiler, realizing the reuse of heat. The rotary motor 11 is started, causing the connecting shaft 12 to drive the striking ball 13 to rotate, causing the dust adhering to its surface to fall off. At the same time, the first bevel gear 14 rotates with the connecting shaft 12, and the second bevel gear 15 drives the connecting rod 16 to rotate, causing the cleaning brush 17 to rotate on the filter screen 6, removing the dust that has not fallen off, ensuring the normal operation of the filter screen 6.
[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A gas duct for fluidized bed boilers, comprising a gas duct (1), characterized in that: The left side of the ash guide pipe (1) is fixedly connected with a shunt pipe (2), the side away from the ash guide pipe (1) of the shunt pipe (2) is fixedly connected with a first flange (3), the side away from the shunt pipe (2) of the first flange (3) is provided with a second flange (4), the middle parts of the second flange (4) and the first flange (3) are both provided with mounting grooves (5), the inside of the mounting groove (5) is provided with a filter screen (6), the inside of the sealing gasket (7) is slidably connected with a connecting bolt (8), the surface of the connecting bolt (8) is threadedly connected with a nut (9), the side away from the first flange (3) of the second flange (4) is fixedly connected with a heat transfer pipe (10).
2. A dust guide for a fluidized bed boiler according to claim 1, characterized in that The middle parts of the first flange (3) and the second flange (4) are provided with a plurality of mounting holes, the connecting bolt (8) is located in the inside of the mounting hole, the sealing gasket (7) is made of rubber material, and the inside of the heat transfer pipe (10) is provided with a heat insulation coating.
3. A dust guide for a fluidized bed boiler according to claim 1, characterized in that The top end of the heat transfer pipe (10) is fixedly connected with a rotary motor (11), the output end of the rotary motor (11) is fixedly connected with a connecting shaft (12), and the surface of the connecting shaft (12) is fixedly connected with a knocking ball (13).
4. A dust guide for a fluidized bed boiler according to claim 3, characterized in that: The surface of the connecting shaft (12) is fixedly sleeved with a first bevel gear (14), the top end of the first bevel gear (14) is engaged with a second bevel gear (15), the side away from the connecting shaft (12) of the second bevel gear (15) is fixedly connected with a connecting rod (16), the side away from the second bevel gear (15) of the connecting rod (16) is fixedly connected with a cleaning brush (17), and the surface of the connecting rod (16) is rotatably connected with a positioning plate (18).
5. A dust guide for a fluidized bed boiler according to claim 4, characterized in that The cleaning brush (17) and the filter screen (6) are in contact, the positioning plate (18) and the heat transfer pipe (10) are fixedly connected, and the positioning plate (18) is located between the cleaning brush (17) and the second bevel gear (15).
6. A dust guide for a fluidized bed boiler according to claim 1, characterized in that: The top end of the ash guide pipe (1) is fixedly connected with a driving motor (19), the output shaft of the driving motor (19) is fixedly sleeved with a convex rib plate (20), the top end of the ash guide pipe (1) is fixedly connected with an adjusting rod (21), the surface of the adjusting rod (21) is movably sleeved with a return spring (22), the top end of the adjusting rod (21) is fixedly connected with a top plate (23), and the bottom end of the top plate (23) is fixedly connected with a knocking rod (24).
7. A dust guide for a fluidized bed boiler according to claim 6, characterized in that The convex rib plate (20) is located at the bottom of the top plate (23), the number of the adjusting rods (21) is two, the two adjusting rods (21) are composed of a plurality of sleeve rods, and the knocking rod (24) is made of polyethylene material.