Coal Mill

Coal Mill

Coal mill is the coal into a coal crushing and mechanical, it is an important auxiliary equipment in pulverized coal boiler. Coal mill process is the process of coal was broken and its surface area increased. To add more surface area, must overcome the binding force between molecules and solids, energy consumption. The coal is ground into pulverized coal in the coal grinding machine, mainly is carries on through the crush, crush and grind in three ways. The crushing process energy consumption of the province. Trituration process most expend energy. Various mill are both in the milling process of the above two or three way, but in what is considered the main types of coal mill and.

Detailed introduction

  • 1. the mill as the edge transmission, equipped with an auxiliary transmission, by the motor through reducer and the size of gear pair drives the mill transmission, small gear and gear shaft adopts a expanding sleeve connection, convenient installation and repair, but also can effectively avoid the tooth folding phenomenon, also can avoid the pinion eccentric and sliding.
  • 2. the feed end adopts the sliding shoe support, discharge end of main bearing with bearing support.
  • 3. with the drying bin wind type structure, the mill on the primary drying moisture has great adaptability, drying chamber is equipped with a lifting plate, which can cause the material to the hot air for sufficient heat exchange.
  • 4. grinding bin used in turn stepped lining board, double stepped lining board, corrugated liner combined arrangement, improving the grinding ability of mill, the grinding process on the grinding chamber is more reasonable.
  • 5. the feeding device adopts louver structure inclined into the wind, the ventilation area which can increase the mill, reduce the air inlet resistance of mill, mill commensurate enhanced heat exchange ability, can effectively prevent the coal mill imported material blocking phenomenon.
Coal Mill
Model specification (m) Capacity (t/h) Rotating speed
(r/min)		 Transmission type Motor Reducer Weight(t)
Remark Model Power
(kw)		 Model Reduction ratio
φ2.2×3 5-6 22 Edge YR355M-8 185 ZD50 5 37 　
φ2.2×4.4 8-9 22 Edge YR355M-6 220 ZDH50 6.3 46 　
φ2.4×4.75 14 20.4 Edge YR400-8 280 ZD60 4.5 54 　
φ2.4×4+2 10-12 20.2 Edge YRKK450-8 250 ZDY35580 4.5 59 　
φ2.4×4.5+2 16-17 20.4 Edge YR4005-8 280 JDX-450 4.5 76 　
φ2.6×4.8+2 9-10 20 Edge YRKK5002-8 400 RZD75 4.5 91 　
φ2.6×5.25+2.25 13-14 19.7 Edge YRKK500-8 400 ZDY400-4.5-11 4.5 98 　
φ2.8×5+3 8-10 18.9 Edge JRQ1512-10 480 MCD-70 3.55 107 　
φ3×9 18-20 18.3 Edge YBKK5560-8 630 MBY560 5 124 　
φ3.2×9.5 28 17 Edge YR800-8/1180 800 NFM710 6.3 140 　
φ3.4×5.25+2.8 30 17.47 Edge YRKK-56-6 900 JDX-800 7.157 169 Exclude main transmission
φ3.8×7.25+3.5 41-43 16.7 Edge YR630-8 1400 MBY800 5.6 220 　

Coal grinding machine is composed of feeding part, discharging part, a rotary part, a transmission part (reducer, small gear, motors, electrical control) and other major parts. Hollow shaft adopts steel castings, the liner is detachable, slewing gear hobbing with casting, the cylinder body with wear-resistant liner, with good resistance to wear. This machine is stable in operation, reliable work.

Working principle

This machine is a horizontal cylinder rotating device, outer gear, two warehouses, lattice type coal mill. Material from the feed devicefeedair evenly into the mill screw shaft first warehouse, the warehouse has stepped lining board or corrugated liner, built in different specifications of steel balls, rotating cylinder pushes the ball to a certain height to generate centrifugal force after the fall, the material produces severe impact and abrasive. Materials in the first position to coarse grinding, the board by the single compartment into the second warehouse, the warehouse linedwith flat lining, steel ball inside, the material to further grinding. Powder through the discharge grate discharge, finish grinding operation.

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