Material adding system for circulating fluidized bed boiler

Abstract

The utility model discloses a material feeding system for a circulating fluidized bed boiler, which belongs to the technical field of circulating fluidized bed boilers and comprises a fluidized bed boiler unit, two hoppers are arranged on one side of the fluidized bed boiler unit, a feeding box is arranged below the hoppers, a feeding cleaning component is arranged in the feeding box, and a feeding cleaning component is arranged in the feeding box. The feeding cleaning assembly comprises a connecting shaft, and a crushing assembly is arranged in the connecting shaft. According to the utility model, the connecting shaft drives the roller to move on the outer surfaces of the circular shaft and the convex block, and at the moment, the convex block drives the roller, the connecting rod and the vibration block to move towards the outer side far away from the connecting shaft, so that materials between the spiral conveying blade and the feeding box are crushed in an auxiliary manner, large materials are crushed into smaller particles, and the granularity of the materials is more uniform; and the phenomenon of incomplete local combustion or unstable fluidization state caused by non-uniform granularity is reduced, so that the material adding effect of the system is effectively improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of circulating fluidized bed boilers, and particularly relates to a material feeding system for circulating fluidized bed boilers. Background Technology

[0002] Circulating fluidized bed boilers are high-efficiency, low-pollution, and clean combustion devices, widely used in power plant boilers, industrial boilers, and waste treatment and utilization. To ensure stable combustion and performance of circulating fluidized bed boilers, materials need to be evenly transported into the system through a feed system.

[0003] For example, Chinese patent document (CN114963166A) discloses a feeding device, a co-firing and conveying system, and a circulating fluidized bed boiler, comprising: a feeding pipe with a closed cap at its top end, and an inlet pipe communicating with the inside of the feeding pipe on the side wall below the closed cap; and a conveying pipe, the first end of which is connected to the furnace inlet of the boiler, the second end of which is opposite to the first end for receiving conveying air, and the bottom end of the feeding pipe connected to the conveying pipe with the connection point located between the first and second ends, so that after the multi-material fuel falls from the feeding pipe into the conveying pipe, it is blown to the furnace inlet by the conveying air. Therefore, the multi-material fuel is blown to the furnace inlet of the boiler by conveying air through the conveying pipe, thereby creating air pressure at the furnace inlet and preventing the hot air in the furnace from flowing back towards the conveying mechanism. This avoids the fuel burning in the reverse direction along the conveying direction, allowing the feeding device to efficiently and safely deliver the multi-material fuel to the boiler. However, during the use of this feeding system, when the material is concentrated and conveyed from the feed pipe to the inside of the feeding pipe, it may cause the material to agglomerate into lumps. In this case, when the material enters the boiler, it may cause incomplete combustion of the material, affecting the boiler heating efficiency. Therefore, improvements are needed. Utility Model Content

[0004] The purpose of this invention is to solve the problem that, in the process of using existing technology, when materials are concentrated and transported from the feed pipe to the inside of the feeding pipe, the materials may agglomerate into lumps, which may cause incomplete combustion of the materials when they enter the boiler, thus affecting the boiler heating efficiency. Therefore, this invention proposes a material feeding system for circulating fluidized bed boilers.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A material feeding system for a circulating fluidized bed boiler includes a fluidized bed boiler unit, two hoppers on one side of the fluidized bed boiler unit, a feed box below the hoppers, a feeding and cleaning component inside the feed box, the feeding and cleaning component including a connecting shaft, and a crushing component inside the connecting shaft;

[0007] The crushing component includes a circular shaft and an inner cavity. Multiple sets of protrusions are linearly arrayed on the outer circumference of the circular shaft. The multiple sets of protrusions are distributed in a circular array on the outer circumference of the circular shaft. A roller is provided on the side of the protrusion away from the circular shaft. A connecting rod is fixedly connected to the side of the roller away from the protrusion. The other end of the connecting rod extends to the outside of the connecting shaft and is fixedly connected to a vibrating block. The vibrating block is slidably sealed inside the connecting shaft.

[0008] As a further description of the above technical solution:

[0009] The circular shaft is located inside the inner cavity, which is located inside the connecting shaft. The circular shaft is rotatably connected inside the connecting shaft, and one end of the circular shaft extends to the outside of the connecting shaft and is fixedly connected to the inner wall of the feed box.

[0010] As a further description of the above technical solution:

[0011] A spring is fitted around the outer periphery of the connecting rod, and the two sides of the spring are fixedly connected to the roller and the inner wall of the connecting shaft, respectively.

[0012] As a further description of the above technical solution:

[0013] The connecting shaft has a cavity and a circular through hole on one side inside. The circular through hole and the cavity are connected to the fixed sleeve. An air supply pipe is connected to the outside of the fixed sleeve. The fixed sleeve is rotatably connected to the outer periphery of the connecting shaft, and one side of the fixed sleeve is fixedly connected to the outer wall of the feed box.

[0014] As a further description of the above technical solution:

[0015] The connecting shaft is rotatably connected inside the feed box, and a spiral conveying blade is fixedly connected to the outer periphery of the connecting shaft. The spiral conveying blade is arranged inside the feed box.

[0016] As a further description of the above technical solution:

[0017] A second gear is fixedly connected to the outer side of the connecting shaft. The second gear is located outside the feed box. A first gear is connected to one side of the second gear. A rotating shaft is fixedly connected inside the first gear.

[0018] As a further description of the above technical solution:

[0019] The rotating shaft is rotatably connected to the outer periphery of the feed box, and a drive motor is fixedly connected to the end of the rotating shaft away from the first gear. The bottom of the drive motor is fixedly connected to the outer wall of the feed box through a support base.

[0020] As a further description of the above technical solution:

[0021] A connecting sleeve is fixedly connected to one side of the connecting shaft. The connecting sleeve is located on the side away from the second gear. Connecting blocks are fixedly connected to both sides of the outer periphery of the connecting sleeve. A cleaning block is fixedly connected to the other side of the connecting block. The cleaning block is in contact with the inner wall of the feed box. A circular frame is fixedly connected to the side of the cleaning block away from the connecting block. The circular frame is fixedly connected to the outer periphery of the connecting shaft. A connecting through hole is opened at the junction of the circular frame and the connecting shaft. The other side of the connecting through hole is connected to the cavity inside the connecting shaft. Multiple air outlets are connected to one side of the circular frame. The air outlets are located on the side opposite to the cleaning block.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0023] 1. In this utility model, the crushing component enables the connecting shaft to drive the roller to move on the outer surface of the round shaft and the protrusion. At this time, the protrusion will drive the roller, connecting rod and vibrating block to move away from the outside of the connecting shaft, so as to assist in crushing the material between the screw conveyor blade and the feed box, crushing large pieces of material into smaller particles, making the material particle size more uniform, reducing the phenomenon of incomplete local combustion or unstable fluidization state caused by uneven particle size, thereby effectively improving the material feeding effect of the system.

[0024] 2. In this utility model, the feeding and cleaning components enable the drive motor to rotate the shaft, the first gear, the second gear, the connecting shaft, and the spiral conveying blades. The spiral conveying blades evenly transport the material inside the feed box to the fluidized bed boiler unit, thereby improving the feeding effect during system operation. At this time, the connecting shaft will drive the connecting sleeve, the connecting block, and the cleaning block to rotate on the inner wall of the feed box to assist in cleaning the inner wall of the feed box. This prevents combustion dust inside the fluidized bed boiler unit from adhering to the inner wall of the feed box after long-term use, thus helping to ensure the feeding stability of the system during operation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0026] Figure 2 This is a three-dimensional structural diagram of the hopper and feed box in this utility model;

[0027] Figure 3 In this utility model Figure 2 A magnified schematic diagram of the structure at point A;

[0028] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the connecting shaft in this utility model.

[0029] Legend:

[0030] 1. Fluidized bed boiler unit; 2. Hopper; 3. Feed box; 4. Feeding and cleaning assembly; 401. Drive motor; 402. Rotating shaft; 403. First gear; 404. Second gear; 405. Connecting shaft; 406. Spiral conveyor blades; 407. Connecting sleeve; 408. Connecting block; 409. Cleaning block; 410. Circular frame; 5. Crushing assembly; 501. Inner cavity; 502. Circular shaft; 503. Protrusion; 504. Roller; 505. Connecting rod; 506. Vibrating block; 507. Spring; 6. Fixing sleeve; 7. Air conveying pipe. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figures 1-4 This utility model provides a technical solution: a material feeding system for a circulating fluidized bed boiler, including a fluidized bed boiler unit 1, two hoppers 2 are provided on one side of the fluidized bed boiler unit 1, a feeding box 3 is provided below the hoppers 2, a feeding and cleaning component 4 is provided inside the feeding box 3, the feeding and cleaning component 4 includes a connecting shaft 405, and a crushing component 5 is provided inside the connecting shaft 405.

[0033] The crushing assembly 5 includes a circular shaft 502 and an inner cavity 501. Multiple sets of protrusions 503 are linearly arranged on the outer periphery of the circular shaft 502. The multiple sets of protrusions 503 are distributed in a circular array on the outer periphery of the circular shaft 502. A roller 504 is provided on the side of the protrusions 503 away from the circular shaft 502. A connecting rod 505 is fixedly connected to the side of the roller 504 away from the protrusions 503. The other end of the connecting rod 505 extends to the outside of the connecting shaft 405 and is fixedly connected to a vibrating block 506. The vibrating block 506 is slidably sealed inside the connecting shaft 405. The circular shaft 502 is located inside the inner cavity 501, and the inner cavity 501 is located inside the connecting shaft 405. The circular shaft 502 is rotatably connected to the inside of the connecting shaft 405. One end of the circular shaft 502 extends to the outside of the connecting shaft 405 and is fixedly connected to the inner wall of the feed box 3. A spring 507 is sleeved on the outer periphery of the connecting rod 505. The two sides of the spring 507 are fixedly connected to the roller 504 and the inner wall of the connecting shaft 405, respectively.

[0034] Detailed implementation: First, the hopper 2 is installed in a suitable position in the fluidized bed boiler unit 1 using an external support frame. Then, the material is conveyed into the hopper 2. The material inside the hopper 2 will enter the feed box 3 under the action of gravity. The material is then conveyed into the fluidized bed boiler unit 1 through the feeding and cleaning component 4. The connecting shaft 405 drives the roller 504 to move on the outer surface of the round shaft 502 and the protrusion 503. When the roller 504 moves to the outer periphery of the protrusion 503, the protrusion 503 will drive the roller 504, the connecting rod 505 and the vibrating block 506 to move away from the connecting shaft 405 to assist in crushing the material between the spiral conveying blade 406 and the feed box 3. This crushes large pieces of material into smaller particles, making the material particle size more uniform and reducing the phenomenon of incomplete local combustion or unstable fluidization caused by uneven particle size, thereby effectively improving the material feeding effect of the system.

[0035] A cavity and a circular through hole are provided on one side of the connecting shaft 405. The circular through hole and the cavity are connected to the fixing sleeve 6. An air supply pipe 7 is connected to the outside of the fixing sleeve 6. The fixing sleeve 6 is rotatably connected to the outer periphery of the connecting shaft 405, and one side of the fixing sleeve 6 is fixedly connected to the outer wall of the feed box 3. The connecting shaft 405 is rotatably connected to the inside of the feed box 3. A spiral conveying blade 406 is fixedly connected to the outer periphery of the connecting shaft 405. The spiral conveying blade 406 is located inside the feed box 3. A second gear 404 is fixedly connected to the outside of the connecting shaft 405. The second gear 404 is located outside the feed box 3. A first gear 403 is connected to one side of the second gear 404. A rotating shaft 402 is fixedly connected inside the first gear 403. The rotating shaft 402 is rotatably connected to the outer periphery of the feed box 3, and the end of the rotating shaft 402 away from the first gear 403 is fixed. A drive motor 401 is connected, and the bottom of the drive motor 401 is fixedly connected to the outer wall of the feed box 3 via a support base. A connecting sleeve 407 is fixedly connected to one side of the connecting shaft 405. The connecting sleeve 407 is located on the side away from the second gear 404. Connecting blocks 408 are fixedly connected to both sides of the outer periphery of the connecting sleeve 407. A cleaning block 409 is fixedly connected to the other side of the connecting block 408. The cleaning block 409 is in contact with the inner wall of the feed box 3. A circular frame 410 is fixedly connected to the side of the cleaning block 409 away from the connecting block 408. The circular frame 410 is fixedly connected to the outer periphery of the connecting shaft 405. A connecting through hole is opened at the junction of the circular frame 410 and the connecting shaft 405. The other side of the connecting through hole is connected to the cavity inside the connecting shaft 405. Multiple air outlets are connected to one side of the circular frame 410. The air outlets are located on the side opposite to the cleaning block 409.

[0036] Detailed Implementation: The drive motor 401 drives the rotating shaft 402 and the first gear 403 to rotate. Utilizing the linkage effect between the first gear 403 and the second gear 404, power is transmitted to the second gear 404, causing the second gear 404 to drive the connecting shaft 405 and the spiral conveying blades 406 to rotate. The spiral conveying blades 406 evenly transport the material inside the feed box 3 to the fluidized bed boiler unit 1, improving the feeding effect during system operation. At this time, the connecting shaft 405 drives the connecting sleeve 407, the connecting block 408, and the cleaning block 4... 09 rotates on the inner wall of the feed box 3 to assist in cleaning the inner wall of the feed box 3, preventing combustion dust inside the fluidized bed boiler unit 1 from adhering to the inner wall of the feed box 3 after long-term use, thus helping to ensure the feeding stability of the system during use. As needed, the external air intake device can send air through the air pipe 7 through the fixed sleeve 6, circular through hole, cavity, connecting through hole, circular frame 410 and multiple air outlets. The air will transport the lighter materials inside the feed box 3 to the inside of the fluidized bed boiler unit 1, further improving the feeding effect of the system during use.

[0037] Working Principle: In operation, the hopper 2 is first installed in a suitable position in the fluidized bed boiler unit 1 using an external support frame. Then, the material is conveyed into the hopper 2. The material inside the hopper 2 enters the feed box 3 under gravity. The drive motor 401 is started as needed, driving the rotating shaft 402 and the first gear 403 to rotate. Utilizing the linkage between the first gear 403 and the second gear 404, power is transmitted to the second gear 404, causing it to drive the connecting shaft 405 and the spiral conveying blades 406 to rotate. The spiral conveying blades 406 then move the material inside the feed box 3. The material is evenly conveyed into the fluidized bed boiler unit 1. At this time, the connecting shaft 405 will drive the connecting sleeve 407, connecting block 408 and cleaning block 409 to rotate on the inner wall of the feed box 3 to assist in cleaning the inner wall of the feed box 3. During the rotation, the connecting shaft 405 will drive the roller 504 to move on the outer surface of the round shaft 502 and the protrusion 503. When the roller 504 moves to the outer periphery of the protrusion 503, the protrusion 503 will drive the roller 504, connecting rod 505 and vibrating block 506 to move away from the connecting shaft 405 to assist in crushing the material between the screw conveyor blade 406 and the feed box 3. It is convenient to use.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A material feeding system for a circulating fluidized bed boiler, comprising a fluidized bed boiler unit (1), characterized in that: The fluidized bed boiler unit (1) has two hoppers (2) on one side, and a feed box (3) is provided below the hoppers (2). The feed box (3) is provided with a feeding and cleaning component (4). The feeding and cleaning component (4) includes a connecting shaft (405). The connecting shaft (405) is provided with a crushing component (5). The crushing component (5) includes a circular shaft (502) and an inner cavity (501). The outer circumference of the circular shaft (502) has a linear array of multiple sets of protrusions (503). The multiple sets of protrusions (503) are distributed in a circular array on the outer circumference of the circular shaft (502). A roller (504) is provided on the side of the protrusion (503) away from the circular shaft (502). A connecting rod (505) is fixedly connected to the side of the roller (504) away from the protrusion (503). The other end of the connecting rod (505) extends to the outside of the connecting shaft (405) and is fixedly connected to a vibrating block (506). The vibrating block (506) is slidably sealed inside the connecting shaft (405).

2. The material feeding system for a circulating fluidized bed boiler according to claim 1, characterized in that: The circular shaft (502) is located inside the inner cavity (501), and the inner cavity (501) is located inside the connecting shaft (405). The circular shaft (502) is rotatably connected inside the connecting shaft (405), and one end of the circular shaft (502) extends to the outside of the connecting shaft (405) and is fixedly connected to the inner wall of the feed box (3).

3. A material feeding system for a circulating fluidized bed boiler according to claim 2, characterized in that: A spring (507) is sleeved on the outer periphery of the connecting rod (505), and the two sides of the spring (507) are fixedly connected to the inner wall of the roller (504) and the connecting shaft (405), respectively.

4. A material feeding system for a circulating fluidized bed boiler according to claim 3, characterized in that: The connecting shaft (405) has a cavity and a circular through hole on one side inside. The circular through hole and the cavity are connected to the fixed sleeve (6). The fixed sleeve (6) is connected to the air supply pipe (7) on one side outside. The fixed sleeve (6) is rotatably connected to the outer periphery of the connecting shaft (405), and one side of the fixed sleeve (6) is fixedly connected to the outer wall of the feed box (3).

5. A material feeding system for a circulating fluidized bed boiler according to claim 4, characterized in that: The connecting shaft (405) is rotatably connected inside the feed box (3), and a spiral conveying blade (406) is fixedly connected to the outer periphery of the connecting shaft (405). The spiral conveying blade (406) is arranged inside the feed box (3).

6. A material feeding system for a circulating fluidized bed boiler according to claim 5, characterized in that: A second gear (404) is fixedly connected to the outer side of the connecting shaft (405). The second gear (404) is located outside the feed box (3). A first gear (403) is connected to one side of the second gear (404). A rotating shaft (402) is fixedly connected inside the first gear (403).

7. A material feeding system for a circulating fluidized bed boiler according to claim 6, characterized in that: The rotating shaft (402) is rotatably connected to the outer periphery of the feed box (3), and a drive motor (401) is fixedly connected to the end of the rotating shaft (402) away from the first gear (403). The bottom of the drive motor (401) is fixedly connected to the outer wall of the feed box (3) through a support seat.

8. A material feeding system for a circulating fluidized bed boiler according to claim 7, characterized in that: A connecting sleeve (407) is fixedly connected to one side of the connecting shaft (405). The connecting sleeve (407) is located on the side away from the second gear (404). Connecting blocks (408) are fixedly connected to both sides of the outer periphery of the connecting sleeve (407). A cleaning block (409) is fixedly connected to the other side of the connecting block (408). The cleaning block (409) is in contact with the inner wall of the feed box (3). A circular frame (410) is fixedly connected to the side of the cleaning block (409) away from the connecting block (408). The circular frame (410) is fixedly connected to the outer periphery of the connecting shaft (405). A connecting through hole is opened at the junction of the circular frame (410) and the connecting shaft (405). The other side of the connecting through hole is connected to the cavity inside the connecting shaft (405). A plurality of air outlets are connected to one side of the circular frame (410). The air outlets are located on the side opposite to the cleaning block (409).

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