VERTICAL ROLLER MILL

• Main Authors: ARIMA KENICHI, SUGA HIROSHI, MATSUMOTO SHINJI, DAIMARU TAKUICHIRO, KUSHIOKA KIYONORI
• Format: Patent
• Language: English; Japanese
• Published: 13.04.2015
• Subjects: CRUSHING, PULVERISING, OR DISINTEGRATING; CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN; OTHER SEPARATING BY DRY METHODS APPLICABLE TO BULK MATERIAL,e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL; PERFORMING OPERATIONS; PREPARATORY TREATMENT OF GRAIN FOR MILLING; SEPARATING SOLIDS FROM SOLIDS; SEPERATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, ORSIFTING OR BY USING GAS CURRENTS; SORTING; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a vertical roller mill with a rotary classifier, capable of reducing a coarse particle rate in a product fine coal.SOLUTION: In a vertical roller mill including a rotary classifier 20 provided in a housing for separating fine powder having a small particle size to discharge the fine powder to an outside by passing of a solid two-phase flow transferring powder obtained by pulverizing a solid on an air flow, the rotary classifier 20 includes multiple plate rotary vanes 22A arranged circumferentially at identical pitches on a circumferential wall surface of a cone 21 rotating within the housing. Each of these plate rotary vanes 22A is installed such that a radially inward side thereof is inclined in a rotational direction with respect to a line orthogonal to outer tangents La and Lb on a rotation locus, and installation angles α1 and α2 of the plate rotary vane 22A with respect to the respective outer tangents La and Lb are set to satisfy (α1>α2) such that the installation angle (α1) of a vane upper end portion is greater than the installation angle (α2) of a vane lower end portion. 【課題】回転式分級機を備えた竪型ローラミルにおいて、製品微粉炭中の粗粒割合（を低減する。【解決手段】固体を粉砕した粉体を気流搬送する固気二相流が通過することにより、粒径の小さい微粉を分級して外部へ流出させる回転式分級機２０をハウジング内に備えている竪型ローラミルにおいて、回転式分級機２０は、ハウジング内で回転するコーン２１の周壁面に周方向へ等ピッチに配置した多数の板状回転羽根２２Ａを備え、この板状回転羽根２２Ａは、回転軌跡の外側接線Ｌａ，Ｌｂと直交する線に対して半径方向内側を回転方向へ傾斜させた設置とされ、かつ、板状回転羽根２２Ａの外側接線Ｌａ，Ｌｂからの設置角度は、羽根上端部側の設置角度（α１）が羽根下端部側の設置角度（α２）より大きな（α１＞α２）値に設定されている。【選択図】図１