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Coal milling method adopting medium speed coal mill as well as used coal mill

A coal mill, medium-speed technology, applied in the direction of dryers, grain processing, lighting and heating equipment, etc., can solve the problems of grinding roller wear, coal quality is not loose, etc.

Inactive Publication Date: 2015-06-03
邹铭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the high-moisture coal falls into the grinding bowl, it may also cause the coal to be loose and form a cake due to the high moisture content, so that the pebble coal will be embedded in the coal cake and aggravate the wear of the grinding roller.

Method used

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  • Coal milling method adopting medium speed coal mill as well as used coal mill
  • Coal milling method adopting medium speed coal mill as well as used coal mill
  • Coal milling method adopting medium speed coal mill as well as used coal mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: as Figure 1 to Figure 3 As shown, the coal mill used includes a coal drop pipe 2 and a grinding body 1, the grinding body 1 is provided with a coal drop opening 6, a coal outlet 8 and an air inlet 4, and the grinding body 1 includes a coal drop opening 6 and an inlet Air duct 4, add a pre-drying device at the coal drop port 6 at the front end of the grinding body 1 to pre-dry the coal entering the grinding body (1), so that the drying output and working conditions of the grinding body 1 can be improved, thereby improving the coal grinding efficiency. machine output, reduce the unit consumption of the coal mill, and reduce the wear of the grinding roller. The pre-drying device includes a circular cylindrical body 7, which is composed of an upper end cover 71, an outer sleeve 72 and an inner sleeve 73. The outer sleeve The air inlet pipe 3 is arranged on the pipe 72, and the air inlet pipe 3 is divided into 2 to 4 sub-pipes before being docked with the oute...

Embodiment 2

[0025] Example 2: refer to Figure 4 , is a structural schematic diagram of the coal mill pre-drying device used in Embodiment 2 of the present invention. Compared with Embodiment 1, the difference of this embodiment is that the diameter of the lower end of the outer sleeve 72 of the pre-drying device is the same as the diameter of the front end of the grinding body 1. The diameters of the coal drop opening 6 are the same, that is, the diameter of the coal drop opening 6 is smaller than the diameter of the inner casing 73 .

Embodiment 3

[0026] Example 3: refer to Figure 5 , is a schematic structural view of the coal mill used in Embodiment 2 of the present invention. Compared with Embodiment 1, the difference of this embodiment is that the air inlet pipe 3 directly introduces hot air through the fan 12, and the hot air used for pre-drying can be It is produced by a general heat source, or it can be high-temperature flue gas; the access point can be the primary air at the entrance of the coal mill, the primary hot air duct, or the furnace or boiler flue.

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Abstract

The invention discloses a coal milling method adopting a medium speed coal mill as well as the coal mill. The coal mill comprises a coal falling pipe (2) and a mill body (1), wherein the mill body (1) is provided with a coal falling port (6), a coal outlet (8) and an air inlet channel (4), a pre-drying device is added to the coal falling port (6) in the front end of the mill body (1) for pre-drying coal entering the coal mill, so that the drying capacity and the working condition of the mill body (1) are improved, further, the drying capacity of the coal mill is improved, the unit consumption of the coal mill is reduced, and wear of a mill roller is reduced.

Description

technical field [0001] The invention relates to a coal pulverizer pre-drying method and a device thereof, in particular to a coal pulverizing method using a medium-speed coal pulverizer and the coal pulverizer. Background technique [0002] Medium-speed coal mill is a kind of coal mill commonly used in thermal power plants, and its common models include ZGM, MPS, HP and other series of roller mills and bowl mills. The working principle of the medium-speed coal mill is that the fine coal falls from the coal drop pipe into the grinding disc, and after falling into the grinding disc, the fine coal is thrown to the grinding bowl and the wind ring by the centrifugal force to complete the grinding and drying, and then is blown to the separation Separation is completed at the device. [0003] When the medium-speed coal mill grinds high-moisture coal, the output of the coal mill will be restricted due to the large moisture in the coal and insufficient output. When the coal volume i...

Claims

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Application Information

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IPC IPC(8): B02C15/00B02C23/02F26B21/00
Inventor 邹铭张耀
Owner 邹铭
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