Uniform coal feeding device for boiler

Abstract

This utility model provides a uniform coal feeding device for boilers, including a coal bunker with a discharge ramp at the bottom. A feed inlet is located above the highest point of the discharge ramp at the top of the coal bunker, and a discharge cylinder is located at the lowest point of the discharge ramp. A trough is formed on the discharge ramp. A distribution bin is installed in the trough at the top, and a filter plate flush with the discharge ramp is installed at the top of the distribution bin. The bottom surface of the distribution bin is parallel to the filter plate, and a discharge channel is located at the lowest point of the bottom surface of the distribution bin. A vibrating motor is installed on the outside of the distribution bin. A grate is installed below the discharge cylinder and the discharge channel. When the coal is conveyed along the slope, the slag deposited at the bottom of the coal is separated into the distribution bin. The vibrating motor vibrates and spreads the slag evenly on the bottom surface of the distribution bin, and the evenly spread slag is conveyed from the discharge channel to the grate. This facilitates the uniform distribution of slag on the grate surface, promotes complete combustion of the coal, and improves resource utilization.

Description

Technical Field

[0001] This utility model relates to the field of boiler coal feeding technology, specifically to a uniform coal feeding device for boilers. Background Technology

[0002] Chain grate boilers are a type of highly mechanized stoker-fired boiler, named for their chain-like grate. They are one of the most widely used types of industrial boilers. Chain grate boilers are a type of front-feed boiler where the coal combustion process is completed while the boiler is moving.

[0003] During operation, coal passes through the coal conveying device and coal bunker of the chain grate boiler before falling onto the grate surface and being fed into the combustion chamber for combustion. During coal feeding, belt conveyors or submerged plate conveyors are typically used. As the coal falls from the discharge port of the conveying device into the coal bunker, it naturally accumulates and rolls, forming mounds. Larger lumps of coal tend to roll to the periphery, while smaller, finer coal dust tends to accumulate in the center of the pile, resulting in uneven distribution of lumps and dust. This leads to a higher density of coal in the center and a lower density on the sides. Consequently, when the coal falls onto the grate surface, its distribution is also uneven. Specifically, the coal on the sides of the grate is mostly lumpy, with lower ventilation resistance and better combustion, while the coal in the center accumulates more finer coal dust, which has a higher density, higher ventilation resistance, and poorer combustion, leading to incomplete combustion. This results in uneven combustion within the furnace, reducing coal combustion efficiency and wasting resources. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model proposes a uniform coal feeding device for boilers to solve the above problems.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] This utility model provides a uniform coal feeding device for boilers, comprising:

[0007] The coal bunker has a material discharge ramp at its bottom, a material inlet is located above the highest point of the material discharge ramp at the top of the coal bunker, a material discharge cylinder is located at the bottom of the lowest point of the material discharge ramp, and a trough is provided on the material discharge ramp.

[0008] The top of the material distribution bin is installed in the trough. The top of the material distribution bin is provided with a filter plate that is flush with the material discharge slope. The bottom of the material distribution bin is parallel to the filter plate. A material discharge channel is provided at the lowest point of the bottom of the material distribution bin. A vibration motor is installed on the outside of the material distribution bin.

[0009] The grate is installed below the feeding cylinder and the feeding channel.

[0010] Furthermore, the width of the feeding channel is adapted to the width of the grate, and multiple partition plates are distributed horizontally at intervals within the feeding channel.

[0011] Furthermore, a first rotating rod is rotatably installed inside the material distribution bin. Multiple first support rods parallel to the first rotating rod are distributed circumferentially on the first rotating rod, and a first motor is driven to one end of the first rotating rod.

[0012] Furthermore, the end of the feeding channel away from the distribution bin is connected to one side of the discharge cylinder.

[0013] Furthermore, a second rotating rod is rotatably installed inside the material discharge cylinder next to the outlet of the material discharge channel. Multiple second supporting rods parallel to the second rotating rod are distributed circumferentially on the second rotating rod, and a second motor is driven to one end of the second rotating rod.

[0014] Furthermore, the bottom end of the feeding cylinder is narrowed and its width is adapted to the width of the grate.

[0015] Furthermore, a scraper is provided on one side of the material discharge cylinder, and the scraper is located above the grate.

[0016] As can be seen from the above technical solution, this utility model provides a uniform coal feeding device for boilers:

[0017] By installing filter plates at the feed ramp, the slag deposited at the bottom of the coal is separated into the distribution bin as the coal is conveyed along the slope. The separation process does not hinder the conveying of the coal. The slag at the bottom of the distribution bin is vibrated and spread evenly by a vibrating motor, and then the evenly spread slag is conveyed to the grate through the feed channel. This helps to ensure that the slag on the grate surface is evenly distributed, maintains the uniform density of the coal on the grate surface, promotes the complete combustion of the coal, and improves the resource utilization rate. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a cross-sectional view of the main structural schematic diagram of this utility model;

[0020] Figure 2 for Figure 1 Cross-sectional view of the material feeding channel at point AA;

[0021] Figure label:

[0022] Coal bunker 1, material discharge ramp 11, material inlet 12, material discharge cylinder 13, chute 14, second rotating rod 15, second support rod 151, scraper 16;

[0023] Material distribution bin 2, filter plate 21, material discharge channel 22, partition plate 221, vibrating motor 23, first rotating rod 24, first support rod 241, first motor 242;

[0024] Grate 3. Detailed Implementation

[0025] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0026] like Figure 1-2 As shown in the figure, this embodiment provides a uniform coal feeding device for boilers, including a coal bunker 1, a material distribution bin 2, and a grate 3.

[0027] The bottom of the coal bunker 1 has a material discharge ramp 11. The surface of the material discharge ramp 11 is inclined so that one end is the highest point and the other end is the lowest point. The top of the coal bunker 1 is provided with a material inlet 12 above the highest point of the material discharge ramp 11. A material discharge cylinder 13 is provided at the bottom of the lowest point of the material discharge ramp 11. The bottom end of the material discharge cylinder 13 faces downward. A trough 14 is provided on the material discharge ramp 11.

[0028] The top of the distribution bin 2 is installed within the trough 14. A filter plate 21, flush with the discharge slope 11, is installed on the top of the distribution bin 2. The filter plate 21 has holes for the passage of fine coal slag. The bottom surface of the distribution bin 2 is parallel to the filter plate 21, making the bottom surface of the distribution bin 2 also inclined. A discharge channel 22 is located at the lowest point of the bottom surface of the distribution bin 2. A vibration motor 23 is installed on the outside of the distribution bin 2. It should be noted that both the filter plate 21 and the bottom surface of the distribution bin 2 can vibrate as a whole due to the influence of the vibration motor 23.

[0029] The grate 3 is installed below the feeding cylinder 13 and the feeding channel 22 to transport coal.

[0030] During the coal conveying and feeding process, the coal material falls from the discharge port of the coal conveying device through the inlet 12 to the highest point of the discharge slope 11 and rolls down. When the coal material passes through the filter plate 21, the larger coal blocks will continue to roll into the discharge cylinder 13, while the smaller flake coal slag will pass through the filter plate 21 and fall to the bottom of the distribution bin 2. Under the vibration of the vibrating motor 23, the flake coal slag will be spread flat on the bottom of the distribution bin 2 and fall out from the discharge channel 22 along the slope. After redistribution, the coal blocks and flake coal slag will finally fall onto the grate surface 3.

[0031] Since the slag in coal usually accumulates at the bottom of the coal pile, conventional mixing devices are unable to fully mix the slag at the bottom with the coal blocks above. In this invention, a filter plate 21 is installed at the feed slope 11 to separate the slag deposited at the bottom of the coal into the distribution bin 2 as the coal is conveyed along the slope. The separation process does not hinder the conveying of the coal. The vibrating motor 23 vibrates and spreads the slag at the bottom of the distribution bin 2 evenly, and the evenly spread slag is conveyed from the feed channel 22 to the grate 3. This helps to ensure that the slag on the grate 3 is evenly distributed, maintains a uniform coal density on the grate 3, promotes complete combustion of the coal, and improves resource utilization.

[0032] Preferably, the width of the feeding channel 22 is adapted to the width of the grate 3 so that the slag can fall evenly onto the grate 3. Furthermore, multiple partition plates 221 are distributed laterally within the feeding channel 22, dividing the feeding channel 22 into multiple independent channels. This allows the slag to continue to be conveyed along the channel direction after entering the feeding channel 22 and to be evenly discharged from the outlet of the feeding channel 22, preventing the slag from accumulating locally within the feeding channel 22.

[0033] In one embodiment, a first rotating rod 24 is rotatably installed inside the distribution bin 2. Multiple first support rods 241 parallel to the first rotating rod 24 are distributed circumferentially on the first rotating rod 24. One end of the first rotating rod 24 is driven and connected to a first motor 242. When the slag falls into the distribution bin 2, the rotation of the first rotating rod 24 can cause the first support rods 241 to disperse the slag, which helps to evenly distribute the slag on the bottom surface of the distribution bin 2.

[0034] In one embodiment, the end of the feeding channel 22 away from the distribution bin 2 is connected to one side of the discharge cylinder 13, so that the evenly distributed slag can be remixed with the coal blocks. Furthermore, a second rotating rod 15 is rotatably installed inside the discharge cylinder 13 next to the outlet of the feeding channel 22. The second rotating rod 15 has multiple parallel second support rods 151 distributed circumferentially on it. One end of the second rotating rod 15 is driven and connected to a second motor (not shown). The rotation of the second rotating rod 24 can cause the second support rods 151 to stir and mix the coal blocks and slag, so that the large and small particles in the coal are evenly mixed.

[0035] Preferably, the bottom end of the feeding cylinder 13 is narrowed and its width is adapted to the width of the grate 3, which helps to concentrate the coal falling onto the grate 3 and prevents excessive dispersion that leads to uneven distribution.

[0036] Furthermore, a scraper 16 is provided on one side of the feeding cylinder 13. The scraper 16 is located above the grate 3, and there is a gap between the scraper 16 and the surface of the grate 3 to limit the height of the coal on the surface of the grate 3.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A uniform coal feeding device for a boiler, characterized in that, include: The coal bunker has a material discharge ramp at its bottom, a material inlet is located above the highest point of the material discharge ramp at the top of the coal bunker, a material discharge cylinder is located at the bottom of the lowest point of the material discharge ramp, and a trough is provided on the material discharge ramp. The top of the material distribution bin is installed in the trough. The top of the material distribution bin is provided with a filter plate that is flush with the material discharge slope. The bottom of the material distribution bin is parallel to the filter plate. A material discharge channel is provided at the lowest point of the bottom of the material distribution bin. A vibration motor is installed on the outside of the material distribution bin. The grate is installed below the feeding cylinder and the feeding channel.

2. The uniform coal feeding device for a boiler according to claim 1, characterized by The width of the feeding channel is adapted to the width of the grate, and multiple partition plates are distributed horizontally at intervals within the feeding channel.

3. The uniform coal feeding device for a boiler according to claim 1, characterized by A first rotating rod is rotatably installed inside the material distribution bin. Multiple first support rods parallel to the first rotating rod are distributed circumferentially on the first rotating rod. One end of the first rotating rod is driven and connected to a first motor.

4. The uniform coal feeding device for a boiler according to claim 1, characterized by The end of the feeding channel away from the distribution bin is connected to one side of the discharge cylinder.

5. The uniform coal feeding device for a boiler according to claim 4, wherein A second rotating rod is rotatably installed inside the material discharge cylinder next to the outlet of the material discharge channel. Multiple second supporting rods are distributed circumferentially on the second rotating rod, and a second motor is driven to one end of the second rotating rod.

6. The uniform coal feeding device for a boiler according to claim 1, wherein The bottom end of the feeding cylinder is narrowed and its width is adapted to the width of the grate.

7. The uniform coal feeding device for a boiler according to claim 1, wherein A scraper is provided on one side of the material discharge cylinder, and the scraper is located above the grate.

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