Method for removing dust at inlet of coal mill

Abstract

A method for removing dust at an inlet of a coal mill comprises the steps that after coal enters a coal falling pipe through a coal feeding channel and a dust removal box, the coal needing to be ground is placed in the coal mill through the coal falling pipe to be ground, and a dust removal device is installed at the inlet of the coal mill; when coal is placed in the dust removal box, flying pulverized coal enters the interior of the air pressure box through the dust suction port under the action of negative pressure, and dust airflow enters the interior of the bag-type dust remover through the negative pressure pipe and the fan connecting pipe under the action of the negative pressure fan to be settled, so that flying dust entering outside air is effectively reduced, and the dust removal efficiency is improved. Pollution to the environment is reduced, and the risk that staff are infected with pneumoconiosis can also be reduced; four groups of air pressure boxes are mounted around the inlet of the coal mill, the air pressure boxes are communicated through negative pressure pipes, negative pressure exists in the negative pressure pipes, flying dust in the dust removal box is balanced, and the adsorption dust removal working effect is improved; the negative-pressure pipe is annular, and the transverse section of the negative-pressure pipe and the transverse section of the dust removal box are of a concentric circle structure.

Description

Technical Field

[0001] The invention relates to the field of coal mills, and in particular to a method for removing dust at an inlet of a coal mill. Background Art

[0002] The working principle of a coal mill mainly involves four stages: crushing, grinding, classifying, and fines collection. During the crushing step, the raw ore is crushed by the crusher and then enters the grinding roller channel, where it is continuously squeezed, ground, cut, and crushed under the pressure of the grinding rollers. The high-speed airflow at the tuyere lifts the ground material, and the coarser material is blown back to the grinding disc for re-grinding. At the same time, the suspended material is dried, and the fine powder is classified by the classifier. The qualified powder is collected by the collector as the finished product.

[0003] Take the HP bowl-type medium-speed coal mill in the prior art as an example. Figure 1 As shown: the coal material inlet on the high-speed coal mill body a is used for feeding: the coal drop pipe b. When feeding the coal drop pipe b, a large amount of coal dust is generated, which will spread to the outside, pollute the environment, and aggravate the infection of pneumoconiosis among the workers. Summary of the Invention

[0004] The object of the present invention is to provide a method for removing dust at the inlet of a coal mill, so as to alleviate the defect of dust diffusion mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, a method for removing dust at the inlet of a coal mill is provided. After the coal passes through the coal inlet channel and the dust removal box and enters the coal drop pipe, the coal to be ground is placed inside the coal mill through the coal drop pipe for grinding. A dust removal device is installed at the inlet of the coal mill. When the coal is placed inside the dust box, the flying coal powder enters the air compressor box through the dust suction port under the action of negative pressure. The dust is then transported through the negative pressure pipe, the fan connecting pipe and the negative pressure fan to the bag filter for sedimentation, effectively reducing the amount of flying dust entering the outside air, reducing pollution to the environment and the risk of employees contracting pneumoconiosis. Four sets of air compressor boxes are installed around the coal mill inlet. The air compressor boxes are connected by negative pressure pipes, and the negative pressure inside the negative pressure pipes also has negative pressure, which balances the flying dust inside the dust box and improves the adsorption dust removal effect. The negative pressure pipe is annular, and the transverse cross-section of the negative pressure pipe and the dust removal box is a concentric circle structure.

[0006] A method for removing dust at the inlet of a coal mill is described, wherein the dust removal device comprises a coal drop pipe (1), the coal outlet at the bottom of the coal drop pipe (1) is ground through a coal grinding assembly inside the coal mill, a dust removal box (4) is installed on the top of the coal drop pipe (1), and the surface of the dust removal box (4) is covered with a sealing cover (5), and a coal inlet channel (6) is installed on the sealing cover (5), and a dust suction port (71) is provided on the side wall of the dust removal box (4); A dust removal assembly (7) is installed outside the dust removal box (4), and the dust removal assembly (7) includes a dust suction port (71), an air pressure box (72), a negative pressure pipe (73) and a negative pressure fan connecting pipe (74), and the negative pressure pipe (73) is connected to the suction end of the negative pressure fan through the negative pressure fan connecting pipe (74), and the exhaust end of the negative pressure fan is connected to the external bag dust collector.

[0007] A method for removing dust at the inlet of a coal mill is described, wherein a limit support plate (2) is welded above the outer side of the coal drop pipe (1), and the bottom of the fixed cylinder (3) is supported by the limit support plate (2), and the fixed cylinder (3) wraps the outer side of the coal drop pipe (1) and is fixed by multiple groups of bolts; the top of the fixed cylinder (3) is welded and fixed to the dust removal box (4), and the top of the dust removal box (4) is fixed to the sealing cover (5) by multiple groups of bolts, and an annular positioning groove is provided on the outer side of the bottom of the sealing cover (5).

[0008] A method for removing dust at the inlet of a coal mill is described, wherein the transverse cross-section of the dust suction port (71) is arranged to be inclined downward, and the dust suction port (71) is arranged in four groups and evenly distributed on the outside of the dust removal box (4), and the outside of each group of dust suction ports (71) is screwed and covered by an air pressure box (72); the air pressure box (72) is evenly arranged in four groups on the outside of the dust removal box (4), and the air pressure box (72) and the dust removal box (4) are sealed by a sealing gasket, and the four groups of air pressure boxes (72) are connected by a negative pressure pipe (73).

[0009] In the method for removing dust at the inlet of a coal mill, the negative pressure pipe (73) is arranged in an annular shape, and the transverse cross-section of the negative pressure pipe (73) and the dust removal box (4) is a concentric circle structure. The interior of the negative pressure pipe (73) absorbs and removes dust inside the dust removal box (4) under the action of a negative pressure fan. Beneficial effects

[0010] The flying coal powder enters the interior of the air compressor box through the dust suction port under the action of negative pressure, and passes through the negative pressure pipe, the fan connecting pipe and under the action of the negative pressure fan, so that the dust airflow enters the interior of the bag dust collector for dust removal, which can reduce the extent of the flying dust entering the outside air, reduce the pollution to the environment, and also reduce the risk of employees contracting pneumoconiosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of a coal mill in the prior art for the structure of the present application; Figure 2 A schematic diagram of the structure of the present application; Figure 3 A schematic diagram of the dust removal assembly of the structure of the present application; Figure 4 A top view of the dust removal assembly of the structure of the present application.

[0012] Reference numerals in the figure: 1, coal drop pipe; 2, limiting support plate; 3, fixed cylinder; 4, dust removal box; 5, sealing cover; 6, coal inlet passage; 7, dust removal assembly; 71, dust suction port; 72, air compression box; 73, negative pressure pipe; 74, negative pressure fan connecting pipe. DETAILED DESCRIPTION

[0013] The method for removing dust at the inlet of the coal mill, the coal passes through the coal inlet passage and the dust removal box, enters the inside of the coal drop pipe, and then the coal to be ground is placed in the inside of the coal mill through the coal drop pipe for grinding, and the dust removal device is installed at the inlet of the coal mill; When the coal is placed in the inside of the dust removal box, the flying coal dust enters the inside of the air compression box through the dust suction port under the action of negative pressure, and the dust gas flow enters the inside of the bag-type dust collector under the action of the negative pressure fan through the negative pressure pipe and the fan connecting pipe, so that the flying dust is effectively reduced to enter the outside air, the pollution to the environment is reduced, and the risk of pneumoconiosis infection of the employees is reduced; four groups of air compression boxes are installed around the inlet of the coal mill, the air compression boxes are communicated through the negative pressure pipes, the inside of the negative pressure pipe also has negative pressure, the flying dust in the inside of the dust removal box is balanced, and the dust adsorption and removal effect is improved; The negative pressure pipe is annular, and the transverse section of the negative pressure pipe and the dust removal box is a concentric circle structure.

[0014] The dust removal device provided by the application comprises a coal drop pipe 1, a coal outlet at the bottom of the coal drop pipe 1 is ground by a grinding assembly in the inside of a coal mill, a dust removal box 4 is installed at the top of the coal drop pipe 1, and the surface of the dust removal box 4 is covered with a sealing cover 5; meanwhile, a coal inlet passage 6 is installed on the sealing cover 5, and a dust suction port 71 is formed in the side wall of the dust removal box 4. A dust removal assembly 7 is installed on the outside of the dust removal box 4, the dust removal assembly 7 comprises the dust suction port 71, an air compression box 72, a negative pressure pipe 73 and a negative pressure fan connecting pipe 74, the negative pressure pipe 73 is in communication with the air suction end of the negative pressure fan through the negative pressure fan connecting pipe 74, and the air exhaust end of the negative pressure fan is in communication with the bag-type dust collector outside.

[0015] In work, the coal enters the inside of the coal drop pipe 1 from the coal inlet passage 6 and the dust removal box 4, the coal to be ground is placed in the inside of the coal mill through the coal drop pipe 1, and the coal grinding work is performed; When the coal material is placed inside the dust removal box 4, the flying coal powder enters the inside of the air compression box 72 through the dust suction port 71 under the action of negative pressure, and under the action of the negative pressure fan, the dust gas flow enters the inside of the bag-type dust collector for subsequent processing work, which can avoid the flying dust entering the outside air and causing environmental pollution, and can also reduce the risk of employees suffering from pneumoconiosis.

[0016] As a preferred embodiment, a limiting support plate 2 is welded on the outside of the coal falling pipe 1, and the bottom of the fixing cylinder 3 is supported by the limiting support plate 2, and the outside of the fixing cylinder 3 wrapping the coal falling pipe 1 is fixed by a plurality of bolts.

[0017] As shown in Figure 2 : the outside of the fixing cylinder 3 wrapping the coal falling pipe 1 is fixed by a plurality of bolts, thereby completing the fixed installation work between the coal falling pipe 1 and the dust removal box 4.

[0018] As a preferred embodiment, the top of the fixing cylinder 3 is welded and fixed with the dust removal box 4, and the top of the dust removal box 4 is fixed with the sealing cover 5 by a plurality of bolts, and the bottom outside of the sealing cover 5 is provided with an annular positioning groove.

[0019] As shown in Figure 2 : the dust removal box 4 is detachable on the outside of the coal falling pipe 1, which is convenient for cleaning the inside of the dust removal box 4.

[0020] As a preferred embodiment, the transverse section of the dust suction port 71 is inclined downward, and the dust suction port 71 is provided as four groups evenly distributed on the outside of the dust removal box 4, and the outside of each group of dust suction ports 71 is covered by the air compression box 72 by screwing.

[0021] As shown in Figure 2 : the outside of each group of dust suction ports 71 is covered by the air compression box 72 by screwing, and the dust suction port 71 is inclined downward, which can avoid the falling coal entering the inside of the dust suction port 71 and causing blockage of the dust suction port 71.

[0022] As a preferred embodiment, four groups of air compression boxes 72 are evenly arranged on the outside of the dust removal box 4, and the air compression box 72 is sealed and connected with the dust removal box 4 by a sealing gasket, and the four groups of air compression boxes 72 are communicated by negative pressure pipes 73.

[0023] As shown in Figures 3-4 : the four groups of air compression boxes 72 are communicated by the negative pressure pipes 73, and the negative pressure pipes 73 form negative pressure inside, which can adsorb and remove dust in the dust removal box 4.

[0024] As a preferable embodiment, the negative pressure pipe 73 is arranged in a ring shape, and the transverse section of the negative pressure pipe 73 and the dust removal box 4 is a concentric circle structure, and the inside of the negative pressure pipe 73 is used to adsorb and remove the dust in the dust removal box 4 under the action of the negative pressure fan.

[0025] While the embodiments of the application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A method for removing dust at the inlet of a coal mill, wherein coal passes through a coal inlet channel and a dust removal box and enters a coal drop pipe. The coal to be ground is then placed in the coal mill through the coal drop pipe for grinding. The method is characterized by: Install dust removal device at the inlet of coal mill; When the coal is placed inside the dust box, the flying coal powder enters the air compressor box through the dust suction port under the action of negative pressure. The dust is then transported through the negative pressure pipe, the fan connecting pipe and the negative pressure fan to the bag filter for sedimentation, effectively reducing the amount of flying dust entering the outside air, reducing pollution to the environment and the risk of employees contracting pneumoconiosis. Four sets of air compressor boxes are installed around the coal mill inlet. The air compressor boxes are connected by negative pressure pipes, and the negative pressure inside the negative pressure pipes also has negative pressure, which balances the flying dust inside the dust box and improves the adsorption dust removal effect. The negative pressure pipe is annular, and the transverse cross-section of the negative pressure pipe and the dust removal box is a concentric circle structure.

2. The method for removing dust at the inlet of a coal mill according to claim 1, characterized in that: The dust removal device comprises a coal drop pipe (1), the coal outlet at the bottom of the coal drop pipe (1) is ground by a coal grinding assembly inside a coal mill, a dust removal box (4) is installed on the top of the coal drop pipe (1), and the surface of the dust removal box (4) is covered with a sealing cover (5), and a coal inlet channel (6) is installed on the sealing cover (5), and a dust suction port (71) is provided on the side wall of the dust removal box (4); A dust removal assembly (7) is installed outside the dust removal box (4), and the dust removal assembly (7) includes a dust suction port (71), an air pressure box (72), a negative pressure pipe (73) and a negative pressure fan connecting pipe (74), and the negative pressure pipe (73) is connected to the suction end of the negative pressure fan through the negative pressure fan connecting pipe (74), and the exhaust end of the negative pressure fan is connected to the external bag dust collector.

3. The method for removing dust at the inlet of a coal mill according to claim 2, characterized in that: A limiting support plate (2) is welded above the outer side of the coal drop pipe (1), and the bottom of the fixed cylinder (3) is supported by the limiting support plate (2), and the fixed cylinder (3) wraps the outer side of the coal drop pipe (1) and is fixed by multiple groups of bolts; the top of the fixed cylinder (3) is welded and fixed to the dust removal box (4), and the top of the dust removal box (4) is fixed to the sealing cover (5) by multiple groups of bolts, and an annular positioning groove is provided on the outer side of the bottom of the sealing cover (5).

4. A method for removing dust at the inlet of a coal mill according to claim 2 or 3, characterized in that: The transverse cross-section of the dust suction port (71) is inclined downward, and the dust suction port (71) is arranged in four groups evenly distributed on the outside of the dust removal box (4), and the outside of each group of dust suction ports (71) is screwed and covered by an air pressure box (72); the air pressure box (72) is evenly arranged in four groups on the outside of the dust removal box (4), and the air pressure box (72) and the dust removal box (4) are sealed by a sealing gasket, and the four groups of air pressure boxes (72) are connected by a negative pressure pipe (73).

5. The method for removing dust at the inlet of a coal mill according to claim 4, characterized in that: The negative pressure pipe (73) is arranged in an annular shape, and the transverse cross-section of the negative pressure pipe (73) and the dust removal box (4) is a concentric circle structure. The interior of the negative pressure pipe (73) absorbs and removes dust inside the dust removal box (4) under the action of the negative pressure fan.

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