Sealing structure of coal mill and coal mill

Abstract

The invention relates to the technical field of coal mills and discloses a sealing structure of a coal mill and the coal mill. The sealing structure of the coal mill comprises a coal mill casing, a spindle and a millstone arranged on the spindle, the sealing structure further comprises an annular barrel and a coal blocking barrel which are arranged around the spindle, the annular barrel is connected to the lower surface of the millstone, the coal blocking barrel is arranged on the coal mill casing, the upper end of the coal blocking barrel extends into the annular barrel, so that two barrel walls are stacked, a sealing air clearance is formed between the two barrel walls; a sealing air cavity capable of communicating with an outer sealing air source is formed between the coal blocking barrel and the spindle, sealing air in the sealing air cavity flows out of the sealing air clearance, pebble coal and pulverized coal can be thoroughly prevented from getting close to the spindle, thus, the sealing structure of the coal mill is protected against abrasion caused by the pebble coal and the pulverized coal, and the sealing effect is improved.

Description

technical field [0001] The invention relates to the technical field of coal pulverizers, in particular to a coal pulverizer sealing structure and a coal pulverizer. Background technique [0002] At present, there are many medium-speed coal pulverizers in thermal power plants, among which MPS medium-speed coal pulverizers occupy a large proportion. There are two types of disc seals for MPS coal mills, one is a labyrinth seal and the other is a carbon ring seal. [0003] For example, in the labyrinth mechanical seal structure of the MPS200 coal pulverizer, there is a sealed air channel between the labyrinth seal and the main shaft. Ideally, the labyrinth seal can achieve a long life. However, in actual operation, due to the influence of the sealing wind pressure and the return water of the coal mill, it is inevitable that the inside of the labyrinth seal will enter the pebble coal. With the increase of running time, the labyrinth seals are worn to varying degrees, which incr...

AI Technical Summary

Problems solved by technology

However, the carbon ring is a vulnerable part, and if it is installed carelessly, it will easily lead to breakage

In addition, carbon rings are easy to wear and need to be replaced once a year. A set of carbon rings costs about 40,000 yuan, and the operating cost is relatively high.

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