Coal dressing dust removal and recovery system

Abstract

The utility model discloses a coal dressing dedusting recovery system which comprises a first belt conveyor, a crusher, a classifying screen and a dedusting ash collecting unit. The dedusting ash collecting unit is used for collecting flying dust at the head and the tail of the first belt conveyor, flying dust above the classifying screen, flying dust at a feeding port of the crusher, flying dust at a discharging port of undersize products of the classifying screen and flying dust at a discharging port of the crusher; the dedusting ash collecting unit is connected with the water mist dedusting assembly; the coal dressing system has the advantages that the dedusting ash collecting unit is designed for the coal dressing system in a centralized mode to collect dust generated in all links of the coal dressing system, the water mist dedusting assembly is designed to conduct centralized spraying dedusting on the collected dust, and slime water formed after dedusting is pumped into the first-section coal dressing system to be recycled, so that the coal dressing system is more environment-friendly. And the device is energy-saving and emission-reducing, has a good dust removal effect, and is worthy of wide-range popularization and application.

Description

Technical Field:

[0001] The utility model relates to the technical field of coal preparation equipment, in particular to a coal preparation dust removal and recovery system. Background Art:

[0002] With the continuous growth of the demand for coal resources, as an important link in coal processing, the production efficiency and environmental protection level of coal preparation plants have been increasingly emphasized. However, during the coal preparation process, especially in areas such as the crusher at the head of the belt conveyor and the sizing screen, the problem of dust pollution is particularly prominent. In coal preparation plants without effective dust prevention measures, the dust concentration at the head of the belt can reach 1000 - 1500 mg / m³. High-concentration dust not only deteriorates the working environment, increases the operation difficulty of workers, seriously endangers the physical health of workers, but also may lead to safety accidents such as coal dust explosions, polluting the coal preparation plant and the surrounding environment. Therefore, in the prior art, water spray dust removal technology is generally used to reduce the dust concentration in coal preparation plants. However, the water spray dust removal technology generally has problems such as a large amount of water spray, which easily leads to a decline in coal quality and belt slippage, and it is difficult for water spray dust removal to cover all links of the entire coal preparation system. The coal slurry formed after water spray dust removal is discharged disorderly, making it difficult to effectively recycle and reuse. Content of the Utility Model:

[0003] The purpose of the utility model is to provide a coal preparation dust removal and recovery system to solve the technical problems in the prior art that the coal preparation spray dust removal has a large amount of water spray, resulting in a decline in coal quality, a small dust removal coverage area, and difficulty in orderly realizing dust recovery and reuse.

[0004] The content of the utility model: A coal preparation dust removal and recovery system, which includes a first belt conveyor, a crusher, a sizing screen, and a dust ash collection unit. The dust ash collection unit is used to collect the dust at the head and tail of the first belt conveyor, the dust above the sizing screen, the dust at the feeding port of the crusher, the dust at the discharge port of the undersize material of the sizing screen, and the dust at the discharge port of the crusher. The dust ash collection unit is connected to a water spray dust removal component, and the water spray dust removal component is connected to a sump through a coal slurry pipeline. The sump is connected to a first-stage coal washing process system. A second belt conveyor is arranged between the crusher and the sizing screen, and the second belt conveyor is used to transport the oversize material of the sizing screen into the crusher.

[0005] Further, wind covers are arranged at both the head and tail of the first belt conveyor, and the wind covers are connected to the dust ash collection unit through a first air duct. Wind boxes are arranged above the sizing screen and at the feeding port of the crusher, and the wind boxes are connected to the dust ash collection unit through a second air duct. Third air ducts are arranged at the discharge port of the undersize material of the sizing screen and at the discharge port of the crusher, and the third air ducts are connected to the dust ash collection unit.

[0006] Further, the dust collection unit includes an ash storage tank, which is connected to the water mist dust removal assembly through an air duct, and an induced draft fan is installed on the air duct.

[0007] Further, a discharge port is arranged at the bottom of the ash storage tank, the discharge port is located above the first belt conveyor, and a flap valve is arranged at the discharge port.

[0008] Further, the water mist dust removal assembly includes a water mist dust removal tank, a dry drainage pipeline is arranged above the water mist dust removal tank, a spray head is installed on the dry drainage pipeline, and a mist discharge pipe is installed on the water mist dust removal tank.

[0009] Further, the floor pit is connected to the first-stage coal washing process system through a slurry pump pipeline, and a floor pump is installed on the slurry pump pipeline.

[0010] The beneficial effects of the present utility model: The present utility model centrally designs a dust collection unit for the coal preparation system to collect the dust generated in each link of the coal preparation system, with a wide coverage. A water mist dust removal assembly is designed to centrally spray and remove dust from the collected dust. The coal slurry water formed after dust removal is pumped into the first-stage coal preparation system for recycling. The amount of spray water used is small, which will not affect the coal quality or cause the belt conveyor to slip. It can save energy and reduce emissions, and has a good dust removal effect, worthy of wide promotion and use. Description of the drawings:

[0011] Figure 1 is a schematic diagram of the present utility model;

[0012] In the figure, the first belt conveyor 1, the first air duct 2, the crusher 3, the sizing screen 4, the ash storage tank 5, the induced draft fan 6, the second belt conveyor 7, the air hood 8, the air box 9, the dry drainage pipeline 11, the spray head 12, the mist discharge pipe 13, the coal slurry pipeline 14, the floor pit 15, the floor pump 16, the second air duct 17, the third air duct 18, the air duct 19, the flap valve 20, the water mist dust removal tank 21. Detailed implementation manners:

[0013] Such as Figure 1As shown in the figure, a coal preparation dust removal and recovery system includes a first belt conveyor 1, a crusher 3, a sizing screen 4, and a dust ash collection unit. The dust ash collection unit is used to collect the dust at the head and tail of the first belt conveyor 1, the dust above the sizing screen 4, the dust at the feed inlet of the crusher 3, the dust at the discharge outlet of the undersize material of the sizing screen 4, and the dust at the discharge outlet of the crusher 3. The dust ash collection unit is connected to a water mist dust removal component, and the water mist dust removal component is connected to a sump 15 through a coal slurry pipeline 14. The sump 15 is connected to a first-stage coal washing process system. A second belt conveyor 7 is arranged between the crusher 3 and the sizing screen 4, and the second belt conveyor 7 is used to transport the oversize material of the sizing screen 4 into the crusher 3.

[0014] Preferably, as Figure 1 shown in the figure, wind hoods 8 are arranged at both the head and tail of the first belt conveyor 1, and the wind hoods 8 are connected to the dust ash collection unit through a first air duct 2. Wind boxes 9 are arranged above the sizing screen 4 and at the feed inlet of the crusher 3, and the wind boxes 9 are connected to the dust ash collection unit through a second air duct 17. Third air ducts 18 are arranged at the discharge outlet of the undersize material of the sizing screen 4 and at the discharge outlet of the crusher 3, and the third air ducts 18 are connected to the dust ash collection unit. The dust ash collection unit includes an ash storage tank 5. The ash storage tank 5 is connected to the water mist dust removal component through an induced air pipeline 19. An induced draft fan 6 is installed on the induced air pipeline 19. A discharge port is arranged at the bottom of the ash storage tank 5, and the discharge port is located above the first belt conveyor 1. A flap valve 20 is arranged at the discharge port.

[0015] Preferably, as Figure 1 shown in the figure, the water mist dust removal component includes a water mist dust removal tank 21. A dry drain pipeline 11 is arranged above the water mist dust removal tank 21, and a spray head 12 is installed on the dry drain pipeline 11. An exhaust pipe 13 is installed on the water mist dust removal tank 21. In order to improve the dust removal efficiency, a dust remover is added to the dry drain pipeline 11. The sump 15 is connected to the first-stage coal washing process system through a slurry pump pipeline, and a sump pump 16 is installed on the slurry pump pipeline.

[0016] During specific operation, as Figure 1As shown in the figure, by using the air suction function of the induced draft fan 6, the dust extracted from the first air duct 2 and the third air duct 18 is centrally collected into the ash storage tank 5. The dust collected in the second air duct 17 falls into the ash storage tank 5 by itself. The large-particle coal dust in the ash storage tank 5 settles and falls into the first belt conveyor 1 for washing (the flap valve 20 is opened regularly). The small-particle coal dust enters the water mist dust removal tank 21, meets and mixes with the dry water and dust remover sprayed by the nozzle 12 to form a coal slurry, which flows into the floor pit 15 by gravity. The coal slurry is pumped into the sectional coal washing process system for recovery by using the floor pump 16.

[0017] The above are only the preferred examples of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A coal preparation dust removal and recovery system, characterized in that: The invention comprises a first belt conveyor (1), a crusher (3), a grading screen (4), and a dust collection unit. The dust collection unit is used to collect dust at the head and tail of the first belt conveyor (1), dust above the grading screen (4), dust at the feed inlet of the crusher (3), dust at the discharge outlet of the grading screen (4), and dust at the discharge outlet of the crusher (3). The dust collection unit is connected to a water mist dust removal component. The water mist dust removal component is connected to a sweeping pit (15) through a coal slurry pipeline (14). The sweeping pit (15) is connected to a first-stage coal washing process system. A second belt conveyor (7) is arranged between the crusher (3) and the grading screen (4).

2. A coal preparation dust removal and recovery system according to claim 1, characterized in that: Wind hoods (8) are provided at the head and tail of the first belt conveyor (1), and the wind hood (8) is connected to the dust collection unit through a first air duct (2). Wind boxes (9) are provided above the grading screen (4) and at the inlet of the crusher (3), and the wind boxes (9) are connected to the dust collection unit through a second air duct (17). Third air ducts (18) are provided at the outlet of the grading screen (4) and at the outlet of the crusher (3), and the third air ducts (18) are connected to the dust collection unit.

3. A coal preparation dust removal and recovery system according to claim 1, characterized in that: The dust collection unit comprises an ash storage box (5), the ash storage box (5) is connected to the water mist dust removal assembly via an induced draft duct (19), and an induced draft fan (6) is installed on the induced draft duct (19).

4. A coal preparation dust removal and recovery system according to claim 3, characterized in that: A discharge port is provided at the bottom of the ash storage box (5), the discharge port is located above the first belt conveyor (1), and a flap valve (20) is provided at the discharge port.

5. A coal preparation dust removal and recovery system according to claim 1, characterized in that: The water mist dust removal assembly comprises a water mist dust removal box (21), a drainage water pipeline (11) is arranged above the water mist dust removal box (21), a nozzle (12) is installed on the drainage water pipeline (11), and a mist exhaust pipe (13) is installed on the water mist dust removal box (21).

6. A coal preparation dust removal and recovery system according to claim 1, characterized in that: The sweeping pit (15) is connected to a first-stage coal washing process system via a slurry pump pipeline, and a sweeping pump (16) is installed on the slurry pump pipeline.

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