Determine the hourly liftAh = Ancaf/brtWhere: ah-hourly lift, t/h;An-annual mine output, 10 million t/ year;C-promote the imbalance coefficient."Code for Design of Coal Industry" stipulates: 1.10 ~ 1.15 when there is a coal bunker at the bottom of the well; When there is no bottom coal bunker, it is 1.20. This design takes 1.12; Af-coefficient of enrichment to enhance ability, taking 1.2;