On double-inlet and double-outlet ball mills

the initial balls loading is over capacity

the scheme for supplement balls is unreasonable

the abrasion of steel balls is excess

and the electricity consumption for grinding is huge.To solve these problems

a new method that can accurately calculate the initial balls loading

the period and quantity of adding balls for the double-inlet and double-outlet ball mill is presented

on the basis of building up the models for steal balls' motion in the barrel and abrasion synthesizing with impact

grinding

friction and impact fatigue.Taking coal mill E in a power plant as the example

this method was applied to ascertain the period and quantity of adding balls after less ball transformation

in consideration of variation of power

maximum capacity and fineness of coal powder caused by variation of steel ball loading.The steal ball abrasion steady characteristic matrix was deduced by variation of distribution of steel balls size

and it was employed to calculate the compensatory quantity of each grade of balls.Compared with the abrasion of steel balls and consumption of power of coal mill B which uses the conventional initial loading balls and adding balls method (706.82 yuan/h)

that of the coal mill E applying the new method is 426.57 yuan/h

indicating the new method has remarkable economic benefit.