HP type coal mill

Abstract

The invention provides an HP type coal mill. The HP type coal mill comprises a static ring, a nozzle ring mounting cavity, a rotary nozzle ring and a first protection plate, wherein the static ring comprises an upper annular expanding cylinder, a vertical cylinder and a lower annular expanding cylinder, and the vertical cylinder is connected with the upper annular expanding cylinder and the lower annular expanding cylinder; the coal mill is provided with the cylindrical nozzle ring mounting cavity, and the axis of the nozzle ring mounting cavity is vertical; the rotary nozzle ring is arranged in the nozzle ring mounting cavity, the rotary nozzle ring can rotate along the axis of the rotary nozzle ring, and a plurality of blades are uniformly distributed on the peripheral surface of the rotary nozzle ring in the circumferential direction; and the first protection plate is an expanding annular plate, the first protection plate is attached to the inner wall face of the upper annular expanding cylinder and fixedly connected with the upper annular expanding cylinder, and the first protection plate protects the upper annular expanding cylinder. According to the coal mill, the discharge amount of pebble coal is reduced, the performance of the coal mill is improved, meanwhile, the abrasion of the annular expanding cylinder and the abrasion of a shell are obviously reduced, the overhaul period is prolonged, and the maintenance cost is reduced.

Description

technical field [0001] The application relates to the technical field of medium-speed coal pulverizers, in particular to HP type coal pulverizers. Background technique [0002] In the HP type coal mill in the prior art, the height is increased by setting an extension ring on the grinding ring tray, and the extension ring forms a barrier to reduce the amount of impurities falling into the slag discharge box due to the separation from the grinding ring tray under the action of centrifugal force, thereby Reduce the amount of slag discharged from the coal mill. [0003] However, while the extension ring reduces the amount of slag discharge, it will cause impurities to be trapped in the grinding area and cannot be discharged, resulting in accelerated wear of the roller sleeves, resulting in a significant reduction in the service life of the roller sleeves and liners. [0004] Therefore, it is necessary to provide an improved technical solution for the above-mentioned deficiencie...

AI Technical Summary

Problems solved by technology

[0003] However, while the extension ring reduces the amount of slag discharge, it will cause impurities to be trapped in the grinding area and cannot be discharged, resulting in accelerated wear of the roll sleeve, resulting in roll sleeve wear. , The service life of the liner is greatly reduced

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