| 摘要 |
In a vertical roller mill equipped with a fixed classifier, a coarse grain proportion in a pulverized coal product can be reduced. The vertical roller mill (10) includes, within a casing (11), a cyclone-type fixed classifier (20A) that classifies fine powder having a small particle diameter by centrifugal force and allows the classified powder to flow out to the outside. In the vertical roller mill (10), the fixed classifier (20A) is configured so that a gas-particle two-phase flow is introduced from a fixed blade inlet window (22) opening on a cone (21) into the inside and, by swirling the gas-particle two-phase flow using a fixed blade (23) attached in the inside vicinity of the fixed blade inlet window (22), the fine powder is flown out to the outside from a pulverized coal outlet (16) at an upper portion of the vertical roller mill (10) through the lower end side of an inner cylinder (24) provided inside the cone (21). A drift plate (26) for strengthening the flow of the gas-particle two-phase flow, which flows from the fixed blade inlet window (22) into the inside of the cone (21), in the downward direction is provided in the vicinity of the fixed blade inlet window (22). |
