A circulating fluidized bed boiler coal slime and gangue spreading and attaching feeding device

Abstract

A coal slime and gangue spreading and attaching feeding device for circulating fluidized bed boilers belongs to the field of circulating fluidized bed boiler feeding technology. It solves the problems of existing coal slime feeding methods, such as easy coking and blockage, high requirements for coal slime, and limited applicability to various boiler types. This device features a rolling attachor with a stepped arc-shaped bottom plate on its inner wall and a cooling structure including a cooling chamber, a cooling water inlet pipe, and a cooling water outlet pipe. The inlet has a feed hopper connected to the gangue feed cylinder and the coal slime feed pipe, with an anti-sticking water pipe connected to the inner wall of the feed hopper. Below the outlet is an upwardly inclined spreading and attaching device. The inlet is connected to a compressed air delivery pipe, and the outlet is externally connected to an arc-shaped nozzle. Two pressure equalizing meshes are fixedly installed internally. Through two-stage attachment, the coal slime is evenly adhered to the surface of the gangue. It has low requirements for coal slime moisture and calorific value, is suitable for various boiler types, improves combustion efficiency, ensures stable boiler operation, and the cooling structure extends the equipment's lifespan.

Description

Technical Field

[0001] This utility model relates to the field of circulating fluidized bed boiler feeding technology, and in particular to a circulating fluidized bed boiler coal slime and coal gangue spreading and attaching feeding device. Background Technology

[0002] The existing methods of feeding coal slime into the furnace have the following shortcomings: When the coal slime is mixed with coal gangue during spiral mixing, it is easily mixed with coal gangue and fed into the furnace. This mixture tends to clump together and coke in the furnace, clogging the slag discharge pipe. Furthermore, the feed inlet is often blocked due to coking. Pressurized feeding from the top of the furnace has strict requirements on the moisture content and calorific value of the coal slime. If the calorific value is low, the coal balls will not burst and burn and will coke. If the moisture content is high, the coal slime will not be able to form spindle-shaped coal balls and will easily clog the flue wall at the tail of the boiler. It is also limited by the height of the furnace. When the coal slime is injected into the furnace from the middle of the furnace, for boilers with buried tubes, the coal slime tends to accumulate on the buried tubes and coke, blocking the flue gas passage. The spray gun is prone to clogging and is difficult to clean and maintain. Continuous feeding is also required. Otherwise, the coal slime at the spray gun nozzle will dry and clog at high temperatures.

[0003] To address the aforementioned problems, this utility model document proposes a feeding device for spreading and attaching coal slime and gangue in a circulating fluidized bed boiler. Utility Model Content

[0004] This utility model provides a coal slime and gangue spreading and attaching feeding device for circulating fluidized bed boilers, which solves the shortcomings of the existing technology, such as easy coking and blockage of coal slime when entering the furnace, high requirements for coal slime, and limited applicability to different furnace types.

[0005] This utility model provides the following technical solution:

[0006] A circulating fluidized bed boiler coal slime and gangue spreading and attaching feeding device includes:

[0007] A rolling attacher equipped with a cooling structure is inclined downwards and fixed inside the high-temperature furnace wall. The inner wall of the rolling attacher is fixed with a row of stepped arc-shaped base plates made of wear-resistant material. An upwardly inclined spreading attacher is provided below the outlet end of the rolling attacher. The input end of the spreading attacher is connected to a compressed air supply pipe, which extends to the outside of the high-temperature furnace wall.

[0008] In one possible design, the main body of the rolling attachment is a double-layered tube, the hollow area of ​​the rolling attachment is a cooling chamber for filling with cooling water, a cooling water inlet pipe is connected to the lower part of the inner wall of the cooling chamber, the cooling water inlet pipe extends to the outside of the high-temperature furnace wall, and a cooling water outlet pipe is connected to the higher part of the inner wall of the cooling chamber.

[0009] In one possible design, a feed hopper is fixedly installed at the inlet of the rolling attachment, and the top of the inner wall of the feed hopper is connected to a coal gangue feed cylinder and a coal slime feed pipe.

[0010] In one possible design, the inner wall of the feed hopper is connected to an anti-sticking water pipe to prevent coal slime from sticking and clogging, and the outlet of the anti-sticking water pipe is located below the outlet of the coal slime feed pipe.

[0011] In one possible design, the output end of the spreading adhesive is externally connected to an arc-shaped nozzle, which is in contact with the lowest stepped arc-shaped base plate.

[0012] In one possible design, two pressure equalization nets are fixedly installed on the inner wall of the spreading and attaching device.

[0013] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

[0014] The working principle and usage process of this technical solution are as follows:

[0015] During use, coal gangue enters the feed hopper of the rolling attachment from the coal gangue feed hopper and coal slime from the coal slime feed pipe. After entering the rolling attachment, the coal slime and coal gangue tumble and roll on the stepped arc-shaped bottom plate made of high-carbon steel wear-resistant material, causing them to collide with each other. Some of the coal slime is then attached to the surface of the coal gangue particles, completing one attachment. During this process, if there is coal slime sticking to the bottom plate, the water flow can be adjusted through the anti-sticking water pipe to prevent coal slime from sticking and clogging. At the same time, the rolling attachment is equipped with a cooling structure. Its main body is a double-layer tube, and the hollow area is the cooling chamber. Cooling water enters the cooling chamber from the cooling water inlet pipe and flows out from the cooling water outlet pipe, ensuring that the rolling attachment does not deform in the high-temperature environment inside the high-temperature furnace wall.

[0016] After the first application, the coal slime and gangue flow out from the outlet of the rolling attachment and enter the upwardly inclined spreading attachment. Compressed air enters the spreading attachment through the compressed air delivery pipe. Two pressure equalization nets are fixedly installed on the inner wall of the spreading attachment to ensure uniform airflow. The output end of the spreading attachment is connected to an arc-shaped nozzle, which fits against the lowest stepped arc-shaped base plate. This sprays the coal slime that has not yet been attached in the rolling attachment onto the surface of the gangue again, while simultaneously spraying the gangue into the boiler furnace, evenly distributing it throughout the entire furnace bed.

[0017] This utility model has the following beneficial effects:

[0018] Compared with the conventional spiral mixing and feeding method, this device uses a two-stage adhesion process—a rolling attachment and a spreading attachment—to ensure that the coal slime is evenly attached to the surface of the coal gangue, rather than simply mixing it before entering the furnace. This avoids problems such as easy coking and clogging in the furnace, blockage of the slag discharge pipe, and coking and blockage of the feed inlet at the screw feeder inlet, thus ensuring the normal operation of the boiler.

[0019] Compared to the top-pressurized feeding method, this device has lower requirements for the moisture content and calorific value of the coal slime. The top-pressurized feeding method has higher requirements for the moisture content and calorific value of the coal slime. Coal briquettes with low calorific value cannot explode and burn, and fall directly into the boiler feed layer, forming coke. Coal slime with high moisture content cannot form spindle-shaped coal briquettes and is prone to clogging the boiler tail flue wall. This device is not subject to these limitations and can be applied to a wider range of coal slime conditions, reducing the impact of coal slime quality problems on boiler operation.

[0020] Compared with the method of injecting coal slurry into the furnace from the middle, this device is applicable to circulating fluidized bed boilers of various furnace types. For boilers with embedded tubes, the coal slurry injected by the spray gun tends to accumulate on the embedded tubes, forming coke and blocking the flue gas flow channel. Furthermore, the spray gun is prone to clogging, making cleaning and maintenance difficult. This device does not have these problems, ensuring the stable operation of the boiler under different furnace types.

[0021] This invention achieves uniform particle size of the material injected into the furnace through a double adhesion process, enabling more complete combustion of coal slime and gangue within the furnace, thus improving combustion efficiency, stabilizing boiler operation, and reducing boiler operation fluctuations caused by material issues.

[0022] The rolling attachment in this invention is equipped with a cooling structure. Through the structure of the cooling chamber, cooling water inlet pipe and cooling water outlet pipe, the rolling attachment is guaranteed not to deform in the high-temperature environment inside the high-temperature furnace wall, thus extending the service life of the equipment and ensuring that the device can work continuously and stably. Attached Figure Description

[0023] Figure 1 A schematic diagram of the installation arrangement of a coal slime and gangue spreading and attaching feeding device for a circulating fluidized bed boiler provided in this embodiment of the utility model;

[0024] Figure 2 A schematic diagram of the rolling attachment structure of a circulating fluidized bed boiler coal slime and gangue spreading and attaching feeding device provided for an embodiment of this utility model;

[0025] Figure 3 A schematic diagram of the internal structure of a rolling attachment for a circulating fluidized bed boiler coal slime and gangue spreading and attaching feeding device provided for an embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the spreading and attaching device structure of a circulating fluidized bed boiler coal slime and gangue spreading and attaching feeding device provided in an embodiment of this utility model.

[0027] Reference numerals: 1. Rolling attachment; 2. Cooling chamber; 3. Cooling water inlet pipe; 4. Cooling water outlet pipe; 5. Stepped arc-shaped bottom plate; 6. Feed hopper; 7. Coal gangue feed cylinder; 8. Coal slime feed pipe; 9. Anti-sticking water pipe; 10. Spreading attachment; 11. Arc-shaped nozzle; 12. Compressed air delivery pipe; 13. Pressure equalization net. Detailed Implementation

[0028] 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.

[0029] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0031] In one embodiment:

[0032] Please refer to Figure 1-4 The feeding device comprises components such as a rolling attachment 1 equipped with a cooling structure and a spreading attachment 10.

[0033] The rolling attachment 1 is inclined downwards and fixed inside the high-temperature furnace wall. Its main body is a double-layered tube, and the hollow area forms a cooling chamber 2. A cooling water inlet pipe 3 is connected to the lower part of the inner wall of the cooling chamber 2. The cooling water inlet pipe 3 extends to the outside of the high-temperature furnace wall and is connected to the outlet of the cooling tower circulation pump to input cooling water into the cooling chamber 2. A cooling water outlet pipe 4 is connected to the upper part of the inner wall of the cooling chamber 2. The other end is connected to the cooling tower water distributor. Cooling water enters the cooling chamber 2 from the cooling water inlet pipe 3, absorbs heat, and flows out from the cooling water outlet pipe 4, thereby ensuring that the rolling attachment 1 does not deform in the high-temperature environment inside the high-temperature furnace wall.

[0034] The inner wall of the rolling attachment 1 is fixedly equipped with a row of stepped arc-shaped bottom plates 5 made of high-carbon steel wear-resistant material. These stepped arc-shaped bottom plates 5 are arranged in an arc-shaped stepped structure, which allows the coal slime and coal gangue to tumble, roll and collide with each other. A feed hopper 6 is fixedly installed at the inlet of the rolling attachment 1. The top of the inner wall of the feed hopper 6 is connected to a coal gangue feed cylinder 7, the other end of which is connected to the outlet of the silo pump, and a coal slime feed cylinder 7, the other end of which is connected to the outlet of the coal slime pump. The feed pipe 8 allows coal gangue to enter the feed hopper 6 through the coal gangue feed cylinder 7, and coal slurry to enter the feed hopper 6 through the coal slurry feed pipe 8. The inner wall of the feed hopper 6 is also connected to an anti-sticking water pipe 9 to prevent coal slurry from sticking and clogging. The other end of the anti-sticking water pipe 9 is connected to the outlet of a high-pressure water pump. The outlet of the anti-sticking water pipe 9 is located below the outlet of the coal slurry feed pipe 8. When there is coal slurry sticking on the stepped arc-shaped bottom plate 5, the flow rate of the anti-sticking water pipe 9 can be adjusted to prevent coal slurry from sticking and clogging.

[0035] Below the outlet end of the rolling attachment 1, there is an upwardly inclined spreading attachment 10. The input end of the spreading attachment 10 is connected to a compressed air supply pipe 12. The compressed air supply pipe 12 extends to the outside of the high-temperature furnace wall and is connected to the outlet of the gas storage tank for supplying compressed air into the spreading attachment 10. The output end of the spreading attachment 10 is connected to an arc-shaped nozzle 11, which is in contact with the bottom stepped arc-shaped base plate 5.

[0036] In actual operation, coal gangue enters the feed hopper 6 from the coal gangue feed cylinder 7 and coal slime from the coal slime feed pipe 8, and then falls into the rolling attachment 1. The coal slime and coal gangue tumble and roll on the stepped arc-shaped bottom plate 5 and collide with each other. Some of the coal slime adheres to the surface of the coal gangue particles, completing one attachment. During this process, cooling water enters the cooling chamber 2 from the cooling water inlet pipe 3 and flows out from the cooling water outlet pipe 4 to ensure that the rolling attachment 1 does not deform. If there is coal slime adhering on the stepped arc-shaped bottom plate 5, the anti-sticking water pipe 9 discharges water to prevent blockage.

[0037] After the first application, the coal slime and gangue flow out from the outlet of the rolling attachment 1 and enter the spreading attachment 10. Compressed air enters the spreading attachment 10 through the compressed air delivery pipe 12 and is sprayed out from the arc nozzle 11, which sprays the coal slime that has not yet been attached into the rolling attachment 1 and attaches it to the surface of the gangue. At the same time, the gangue is sprayed into the boiler furnace and evenly distributed throughout the furnace bed, so as to achieve stable combustion of coal slime and gangue in the furnace. This device has low requirements for the moisture content and calorific value of the coal slime and can be applied to circulating fluidized bed boilers of various furnace types.

[0038] This application can be used in the field of circulating fluidized bed boiler feeding, or in other fields applicable to this application.

[0039] In another embodiment:

[0040] A coal slime and gangue spreading and attaching feeding device for circulating fluidized bed boilers is applied in the field of circulating fluidized bed boiler feeding technology.

[0041] Please refer to Figure 4 Two pressure equalization nets 13 are fixedly installed on the inner wall of the spreader 10. After the compressed air enters the spreader 10, it passes through the pressure equalization nets 13 to make the airflow uniform.

[0042] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0043] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A circulating fluidized bed boiler coal slime coal gangue scattering and adhering feeding device, characterized in that, include: A rolling attacher (1) with a cooling structure is fixedly inserted into the high-temperature furnace wall at a downward angle. A row of stepped arc-shaped base plates (5) made of wear-resistant material is fixedly installed on the inner wall of the rolling attacher (1). An upwardly inclined spreading attacher (10) is installed below the outlet end of the rolling attacher (1). A compressed air conveying pipe (12) is connected to the input end of the spreading attacher (10). The compressed air conveying pipe (12) extends to the outside of the high-temperature furnace wall.

2. The coal slime and coal gangue spreading and adhering feeding device for a circulating fluidized bed boiler according to claim 1, characterized in that, The main body of the rolling attachment (1) is a double-layer tube. The hollow area of ​​the rolling attachment (1) is a cooling chamber (2) for filling with cooling water. A cooling water inlet pipe (3) is connected to the lower part of the inner wall of the cooling chamber (2). The cooling water inlet pipe (3) extends to the outside of the high-temperature furnace wall. A cooling water outlet pipe (4) is connected to the higher part of the inner wall of the cooling chamber (2).

3. The coal slime and coal gangue spreading and adhering feeding device for a circulating fluidized bed boiler according to claim 1, characterized in that, The input port of the rolling attachment (1) is fixedly provided with a feed hopper (6), and the top of the inner wall of the feed hopper (6) is connected to a coal gangue feed cylinder (7) and a coal slime feed pipe (8).

4. The coal slime and coal gangue spreading and adhering feeding device of a circulating fluidized bed boiler according to claim 3, characterized in that, The inner wall of the feed hopper (6) is connected to an anti-sticking water pipe (9) to prevent coal slime from sticking and clogging. The outlet of the anti-sticking water pipe (9) is located below the outlet of the coal slime feed pipe (8).

5. The coal slime and coal gangue spreading and adhering feeding device for a circulating fluidized bed boiler according to claim 1, characterized in that, The output end of the spreading applicator (10) is connected to an arc-shaped nozzle (11), which is in contact with the bottom stepped arc-shaped base plate (5).

6. The coal slime and coal gangue spreading and sticking feeding device of a circulating fluidized bed boiler according to claim 1, characterized in that, Two pressure equalization nets (13) are fixedly installed on the inner wall of the spreading and attaching device (10).

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