Device and method for improving output of coal mill

Abstract

The invention relates to a device and method for improving the output of a coal mill, and belongs to the technical field of industrial equipment. According to the technical scheme, a coal discharging pipe (1) is arranged in the center of the upper part of the mill; the grinding rollers (9) are matched with the grinding disc (10), the three grinding rollers (9) are uniformly arranged in the circumferential direction and are fixedly connected with the tripod (2), the tripod mounting table (5) and the grinding machine shell (3) are integrated, and the tripod (2) is mounted on the grinding machine; the hydraulic rod (4) is positioned outside the mill shell (3) and is in driving connection with the end part of the tripod (2); the adjustable gasket (6) is installed between the tripod (2) and the tripod installation table (5), and the multiple sets of powder blocking devices (7) are evenly arranged above the grinding disc (10) in the circumferential direction. The device has the beneficial effects that when the quality of pulverized coal becomes poor, the hourly output of the coal mill can be improved, the coal output of the coal mill is reduced, the operation power consumption cost of the coal mill is reduced, and the labor intensity of workers is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to a device and method for improving the output of a coal mill, and belongs to the technical field of industrial equipment. BACKGROUND

[0002] Medium-speed coal mills are selected by most enterprises such as thermal power generation, steel and chemical industry due to the relatively high grinding efficiency and low energy consumption. In recent years, with the continuous deepening of destocking and structure adjustment of the steel industry, the cost reduction pressure of the entire industry has increased sharply, and it seems to be an inevitable choice for steel enterprises to pursue higher cost performance of the coal for injection.

[0003] When the grindability of raw coal is poor, the stone content is high, the moisture content is high, or the particle size of the injected pulverized coal does not meet the requirements, the hourly output of the coal mill will be greatly reduced, the coal discharge amount of the coal mill will be increased, the operation of the coal mill will be greatly affected, the labor intensity of the workers will be increased, and the production safety risk will be obviously increased.

[0004] Therefore, it is necessary to provide a method for improving the output of a coal mill, so as to improve the hourly output of the coal mill under the condition that the quality of the pulverized coal is poor, reduce the labor intensity of the workers, and reduce the production safety risk. SUMMARY

[0005] The application aims to provide a device and method for improving the output of a coal mill, which can improve the hourly output of the mill, reduce the coal discharge amount of the coal mill, reduce the operation power consumption cost of the mill, reduce the labor intensity of the workers, and solve the problems in the background art.

[0006] The technical scheme of the application is as follows: A device for improving the output of a coal mill comprises a coal inlet pipe, a tripod, a mill shell, a hydraulic rod, a tripod mounting table, an adjustable gasket, a powder blocking device, a pressurizing spring, a grinding roller, a grinding disc, a coarse powder separator and a powder collecting pipe. The coal inlet pipe is arranged at the upper center of the mill and connected with a coal feeder at the top. The grinding roller is matched with the grinding disc, and the grinding roller is uniformly arranged in a circumferential direction. The three grinding rollers are fixedly connected with the tripod through the pressurizing spring. The tripod mounting table is integrated with the mill shell, and the tripod is mounted on the mill through the tripod mounting table. The hydraulic rod is located outside the mill shell and drivingly connected with the end of the tripod. The adjustable gasket is mounted between the tripod and the tripod mounting table. A plurality of powder blocking devices are uniformly arranged above the grinding disc in a circumferential direction.

[0007] The powder blocking device comprises a stainless steel plate and a bolt with adjustable length. The stainless steel plate is rotationally connected to the inner wall of the mill shell, and the bolt with adjustable length is supported on the stainless steel plate.

[0008] The stainless steel plate in the powder blocking device is rotationally connected to the inner wall of the mill shell through a hinge.

[0009] The included angle between the stainless steel plate in the powder blocking device and the inner wall of the mill shell is 50-75 degrees.

[0010] The powder blocking device is 6 groups arranged uniformly in the circumference, and the perpendicular height from the upper surface of the grinding disc is 100-200 mm.

[0011] The thickness adjustment range of the adjustable gasket is 10-100 mm.

[0012] A method for improving the output of a coal mill, which adopts the high coal mill output device defined above, and when grinding coal, the thickness of the adjustable gasket is adjusted according to the quality and type of raw coal to control the static distance between the grinding disc and the grinding roller; and the angle of the powder blocking device is adjusted according to the coal discharge amount of the mill.

[0013] When the raw coal is poor in grindability, contains more impurities and has high moisture, the height of the adjustable gasket is reduced; on the contrary, the height of the adjustable gasket is increased; when the coal discharge amount of the mill is large, the angle of the powder blocking device is increased, and on the contrary, the angle of the powder blocking device is reduced.

[0014] The thickness adjustment range of the adjustable gasket is 10-100 mm, and the thickness of each adjustment cannot be greater than 10 mm; the angle adjustment range of the powder blocking device is 50-75 degrees, and the angle of each adjustment cannot be greater than 5 degrees.

[0015] The beneficial effects of the present application are that when the quality of the coal powder is poor, the hourly output of the mill can be increased by more than 15%, the coal discharge amount of the coal mill is reduced, the operating power consumption cost of the mill is reduced, the labor intensity of workers is reduced, the operation is simple, the maintenance is convenient, and the present application is efficient, safe and environmentally friendly. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Figure 1 is a schematic diagram of a lateral section of the coal mill of the present application; Figure 2 Figure 2 is a schematic diagram of a top view in direction A of the present application; Figure 3 Figure 3 is a schematic diagram of a partial view of the powder blocking device of the present application; In the figure: 1, coal pipe, 2, tripod, 3, mill shell, 4, hydraulic rod, 5, tripod mounting table, 6, adjustable gasket, 7, powder blocking device, 8, pressure spring, 9, grinding roller, 10, grinding disc, 11, coarse powder separator, 12, powder collecting pipe, 13, stainless steel plate, 14, bolt with adjustable length. DETAILED DESCRIPTION

[0017] The present application will be further described by examples in combination with the accompanying drawings.

[0018] Referring to the accompanying Figures 1-3The device for improving the output of the coal mill comprises a coal pipe 1, a tripod 2, a mill shell 3, a hydraulic rod 4, a tripod mounting table 5, an adjustable gasket 6, a powder blocking device 7, a pressure spring 8, a grinding roller 9, a grinding disc 10, a coarse powder separator 11 and a powder collecting pipe 12.

[0019] In the embodiment, reference is made to the accompanying drawings Figures 1-3 The device for improving the output of the coal mill comprises a coal pipe 1, a tripod 2, a mill shell 3, a hydraulic rod 4, a tripod mounting table 5, an adjustable gasket 6, a powder blocking device 7, a pressure spring 8, a grinding roller 9, a grinding disc 10, a coarse powder separator 11 and a powder collecting pipe 12. Figure 1 It is shown that the coal pipe 1 is arranged at the upper center of the mill, and the top is connected with the coal feeder. The grinding roller 9 is fixedly connected with the tripod 2 through the pressure spring 8. The tripod mounting table 5 is integrated with the mill shell 3. The tripod 2 is installed on the mill through the tripod mounting table 5. The hydraulic rod 4 is installed at the end of the tripod 2 extending outside the mill shell 3.

[0020] Figure 1 It is shown that the tripod mounting table 5 is integrated with the mill shell 3. The adjustable gasket 6 is installed between the tripod 2 and the tripod mounting table 5. The hydraulic rod 4 is lifted up during installation. The adjustable gasket 6 is used to control the static distance between the grinding disc 10 and the grinding roller 9. The thickness of the adjustable gasket 6 is adjusted in the range of 10-100 mm. The thickness of each adjustment should not be higher than 10 mm.

[0021] Figure 1 It is shown that the powder blocking device 7 is installed on the inner wall of the mill shell 3 which is higher than the vertical height of the upper surface of the grinding disc 10 by 100-200 mm according to the actual situation of the equipment. The coal powder outside the grinding disc 10 and the sundries between the grinding disc 10 and the mill shell 3 need to be cleaned during installation.

[0022] Figure 2 It is shown that the upper part of the powder blocking device 7 is a stainless steel plate 13, each of which has a length of 150-300 mm. The total length of the stainless steel plate 13 is controlled in the range of 30%-80% of the circumferential length of the part along the circumference of the mill shell 3. Six groups of the stainless steel plate 13 are uniformly arranged along the circumference. The width of the stainless steel plate 13 is controlled in the range of 70%-80% of the horizontal distance between the grinding disc 10 and the mill shell 3 at the part.

[0023] Figure 3 The upper stainless steel plate 13 of the powder blocking device 7 is fixed to the inner wall of the mill shell 3 by a hinge, and each lower part is supported and fixed by an adjustable length bolt 14, together with the upper stainless steel plate 13 to form an angle-adjustable powder blocking device 7 structure. The angle of the powder blocking device 7 is adjusted to control the discharge speed of the coal powder, and the angle adjustment range of the powder blocking device 7 is 50°-75°, and the angle adjustment is not greater than 5° each time.

[0024] A method for improving the output of a coal mill, the specific steps are as follows: 1) During the shutdown of the coal pulverizing system including the mill, after completing the relevant safety procedures and safety monitoring, the adjustable gasket 6 and the powder blocking device 7 are installed in the mill to the specified position; the adjustable gasket 6 is located between the tripod mounting table 5 and the tripod 2, and the hydraulic rod 4 needs to be lifted when installing the adjustable gasket 8; the powder blocking device 7 is intermittently around the inner wall of the mill shell 3, and the installation height is higher than the upper edge of the grinding disc 10, and the coal powder on the outer edge of the grinding disc 10 and the debris between the grinding disc 10 and the mill shell 3 need to be cleaned during installation; 2) After checking and confirming before starting the mill, start the mill according to the normal starting operation process; 3) Control the related parameters of the mill within the required range according to the post operation standard, and focus on the mill coal discharge, coal powder quality, and mill output, etc. If the mill coal discharge is more, the coal powder quality is unqualified, and the mill output is low, the mill needs to be stopped according to the operation process, and the thickness of the adjustable gasket 6 is adjusted or the angle of the powder blocking device 7 is adjusted; 4) According to the changes of the raw coal quality and the raw coal type, the angle of the adjustable gasket 6 is adjusted to control the static distance between the grinding disc 10 and the grinding roller 9; when the raw coal is poor in grindability, the stone quality is high, and the moisture is high, the thickness of the adjustable gasket 6 is reduced, otherwise, when the raw coal is good in grindability, the stone quality is low, and the moisture is low and relatively stable, the thickness of the adjustable gasket 6 is increased, and the height adjustment range of the adjustable gasket 6 is 10-100mm, and the height adjustment should not be higher than 10mm each time; 5) Adjust the angle of the powder blocking device 7, increase the angle of the powder blocking device 7 when the mill coal discharge is more and the mill output is low, and decrease the angle of the powder blocking device 7 when the mill coal discharge is less; the angle adjustment range of the powder blocking device 7 is 50°-75°, and the angle adjustment should not be greater than 5° each time; 6) Restart the mill according to the normal starting operation process, and repeat steps 3-5 again until the mill runs well, the hourly output is improved, the mill coal discharge is within a reasonable range, and the injected coal powder particle size is qualified.

Claims

1. An apparatus for increasing the output of a coal mill, characterized by: The device comprises a coal pipe (1), a tripod (2), a mill shell (3), a hydraulic rod (4), a tripod mounting table (5), an adjustable gasket (6), a powder blocking device (7), a pressing spring (8), a grinding roller (9), a grinding disc (10), a coarse powder separator (11) and a powder collecting pipe (12). The coal pipe (1) is arranged at the upper center of the mill and connected with the coal feeder at the top. The grinding roller (9) is matched with the grinding disc (10). The grinding roller (9) is arranged uniformly in the circumferential direction. The three grinding rollers (9) are connected and fixed with the tripod (2) through the pressing spring (8). The tripod mounting table (5) is integrated with the mill shell (3). The tripod (2) is installed on the mill through the tripod mounting table (5). The hydraulic rod (4) is located outside the mill shell (3). The hydraulic rod (4) is drivingly connected with the end of the tripod (2). The adjustable gasket (6) is installed between the tripod (2) and the tripod mounting table (5). Multiple groups of the powder blocking device (7) are arranged uniformly above the grinding disc (10) in the circumferential direction.

2. A device for increasing the output of a coal pulverizer as claimed in claim 1, wherein: The powder blocking device (7) comprises a stainless steel plate (13) and a bolt (14) with adjustable length. The stainless steel plate (13) is rotatably connected to the inner wall of the mill shell (3). The bolt (14) with adjustable length is supported on the stainless steel plate (13).

3. A device for increasing the output of a coal pulverizer as claimed in claim 2, wherein: The stainless steel plate (13) in the powder blocking device (7) is rotatably connected to the inner wall of the mill shell (3) through a hinge.

4. A device for increasing the output of a coal pulverizer as claimed in claim 2, wherein: The included angle between the stainless steel plate (13) in the powder blocking device (7) and the inner wall of the mill shell (3) is 50°-75°.

5. A device for increasing the output of a coal pulverizer as claimed in claim 1 or 2, wherein: The powder blocking device (7) is arranged uniformly in 6 groups in the circumferential direction. The perpendicular height of the powder blocking device (7) to the upper surface of the grinding disc (10) is 100-200 mm.

6. A device for increasing the output of a coal pulverizer as claimed in claim 1, wherein: The thickness adjustment range of the adjustable gasket (6) is 10-100 mm.

7. A method of increasing the output of a coal mill, characterised by: The device defined in claims 1-6 is used for grinding coal. According to the quality and type of raw coal, the thickness of the adjustable gasket (6) is adjusted to control the static distance between the grinding disc (10) and the grinding roller (9). Meanwhile, the angle of the powder blocking device (7) is adjusted according to the coal discharge amount of the mill.

8. A method of increasing the output of a coal mill as claimed in claim 7, characterised in that: When the raw coal has poor grindability, more impurities and high moisture, the height of the adjustable gasket (6) is reduced. Conversely, the height of the adjustable gasket (6) is increased. When the coal discharge amount of the mill is large, the angle of the powder blocking device (7) is increased. Conversely, the angle of the powder blocking device (7) is reduced.

9. A method of increasing the output of a coal mill as claimed in claim 8, characterised in that: The thickness adjustment range of the adjustable gasket (6) is 10-100 mm. The thickness of each adjustment should not be greater than 10 mm. The angle adjustment range of the powder blocking device (7) is 50°-75°. The angle of each adjustment should not be greater than 5°.

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