On the basis of the test research on Shengli lignite coal grinding and calculation about large fan mill type-selection

the method of fan mill type-selection was proposed for lignite with low calorific value

low grindability

high moisture and used in high altitude conditions.It suggested the FM410.1300 fan mill be adopted and configured in 6+2mode.When the ventilation volume of a single fan mill satisfies the requirements of coal dryness in BMCR load condition

the air coal ratio is 1.54.Furthermore

according to such parameters as coal fineness R90

pulverizing unit coal consumption

ventilation and booster pressure picked up in the commissioning curves of S02 mill

the corrected booster pressure of the FM410.1 300 fan mill is 1 594 Pa.The pipeline resistance is suggested to be matched with the corresponding booster pressure.Fan mill type selection calculation for small S02 mill and the field MB3600/1000/490 large scale fan mill was conducted respectively.The obtained booster pressure agrees well with each other

indicating using the S02 fan mill to select the key parameters is reliable.