Gradient grinding type HP (High Power) type coal mill

Abstract

The invention relates to a gradient grinding type HP (High Power) type coal mill. Abrasion-resistant alloy is surfaced on the outer surface of a roll sleeve of a grinding roll to form a roll tire type grinding roll with a cross section which is of a semi-arc structure, the abrasion-resistant alloy is surfaced on the surface of the inner side of a lining plate to form an arc structure which is inwards concave and adapts to the roll tire type grinding roll in shape, the surface of the outer side of the lining plate is connected with a grinding bowl through a flat key, the small end of the lining plate is compacted with a grinding bowl hub through a grinding bowl clamping ring, a grinding bowl extending baffle ring is fixed on the grinding bowl hub and positioned at the large end of the lining plate, and a gap is arranged between the inner wall of the grinding bowl extending baffle ring and the large end of the lining plate. According to the scheme, hard coal can be prevented from being discharged as coal gangue, the discharging mount of the coal gangue is reduced, and the working efficiency of ground coal is increased.

Description

technical field [0001] The invention relates to the technical field of HP-type coal pulverizers, in particular to a gradual rolling type HP-type coal pulverizer. Background technique [0002] In the known technical field, coal mills are divided into vertical pulverizers, high-pressure suspension roller mills, medium-speed micro-powder mills, overpressure trapezoidal mills, and Raymond mills. Coal mills are used to crush coal blocks and grind them into coal It is an important auxiliary equipment for pulverized coal furnace. The coal grinding process is a process in which coal is broken and its surface area is continuously increased. To increase the new surface area, the binding force between solid molecules must be overcome, so energy is consumed. Coal is ground into coal powder in the coal mill, mainly through crushing, smashing and grinding, among which the crushing process consumes the least energy, and the grinding process consumes the most energy. All kinds of coal mil...

AI Technical Summary

Problems solved by technology

When grinding coal, it forms a working form of linear grinding, which is easy to grind for general high-quality bituminous coal; when encountering hard raw coal, when the coal mill is working, HP can be seen from the force of the vertical section. The contact of the grinding part of the mill is linear, the grinding pressure is evenly distributed, the grinding roller is prone to slipping, and the raw coal cannot be fully ground

Therefore, the harder raw coal is thrown to the pebble coal discharge area by the centrifugal force of the grinding bowl and is discharged by the coal mill. This is the main reason why the raw coal in the pebble coal will increase, so that some performance parameters cannot meet the design requirements.

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