A kind of internal sealing structure of hp medium speed coal mill

Abstract

The invention relates to an internal sealing structure of an HP medium speed coil mill. The internal sealing structure of the HP medium speed coil mill is provided with an upper sealing ring, a middle sealing ring and a lower sealing ring which are arranged on the upper side, in the middle and on the lower side respectively, a gapless radial floating sealing device is provided with a positioning pin capable of making reciprocating motion back and forth in the radial direction of a rotary shaft of the coal mill, and the positioning pin is provided with a carbon sealing ring in a connected mode through a spring. The internal sealing structure of the HP medium speed coil mill has the advantages that the internal sealing structure is resistant to high temperature and abrasion and has the self-lubricating property, the rotary shaft of the coal mill will not be abraded in the operation process, and thus the problems of air leakage and powder leakage of the bottom of the coal mill can be solved fundamentally, and the overhaul frequency of the coal mill is greatly reduced; meanwhile, the internal sealing structure is convenient to detach, the overhaul work period is shortened, the labor intensity of on-site construction is relieved, the on-site environment is greatly improved, and the internal sealing structure has remarkable economical benefits and practical value.

Description

technical field [0001] The invention relates to the technical field of HP medium-speed coal mills, in particular to an inner sealing structure of HP medium-speed coal mills. Background technique [0002] In the known technical field, HP medium-speed coal mill is a commonly used equipment in the pulverization system of large-capacity boiler units in thermal power plants, and is one of the main energy-consuming equipment of boiler units. Its operating status is closely related to the economic benefits of the power plant. The wear and tear of the gas seal components and the leakage of the gas seal system caused by the discharge of pebble coal in the coal mill are common problems in the operation of the HP medium-speed coal mill, which brings about the replacement of spare parts and the increase of equipment maintenance costs, which greatly improves the The operating cost of the boiler unit has seriously affected the economic benefits of the power plant. [0003] At the same ti...

AI Technical Summary

Problems solved by technology

The metal labyrinth seal is a gap sealing method. During operation, due to changes in the working conditions of the coal mill and the sealing air pressure, friction between the dynamic and the static is inevitable, and the shaft of the coal mill is damaged to a certain extent, the sealing effect is reduced, and the air leakage is increased. Larger results in a further reduction in the pressure of the sealing air, resulting in the leakage of pulverized coal

On the one hand, the leakage of pulverized coal causes the reducer to operate in a harsh environment, and a large amount of dust is poured into the reducer, which deteriorates the oil quality and reduces the service life of the coal mill, and there is a risk of fire caused by high temperature hot air, resulting in equipment damage ; On the other hand, it also seriously pollutes the environment in the factory

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