本发明公开了一种散状物料气流干燥分级装置及方法,该装置包括外筒和设置在所述外筒内的内筒;所述外筒包括上大下小的外上筒和外下筒,所述外上筒的顶部设有极细颗粒煤尘出口,所述外下筒的底部设有大颗粒煤料出口,所述外下筒的上部设有煤料入口,所述外下筒的下部设有流化气体入口;所述内筒包括上大下小的内上筒和内下筒,所述内上筒的上端开口,所述内下筒的底部伸出外下筒设置,所述内下筒的底部设有小颗粒煤料出口.本发明可以在干燥的同时将散状物料分成需要粉碎的大颗粒煤料,不需粉碎的小颗粒和极细颗粒这三种粒度等级需求。

The invention discloses an air flow drying and grading device and a method for bulk materials. The device comprises an outer cylinder and an inner cylinder arranged in the outer cylinder; The outer cylinder comprises an outer upper cylinder and an outer lower cylinder, the top of the outer upper cylinder is provided with a very fine particle coal dust outlet, the bottom of the outer lower cylinder is provided with a large particle coal material outlet, the upper part of the outer lower cylinder is provided with a coal material inlet, and the lower part of the outer lower cylinder is provided with a fluidizing gas inlet; The inner cylinder comprises an upper large inner cylinder and a lower small inner cylinder, the upper end of the inner upper cylinder is opened, the bottom of the inner lower cylinder extends out of the outer lower cylinder, and the bottom of the inner lower cylinder is provided with a small particle coal material outlet. The invention can divide the bulk material into large particle coal materials requiring powder crushing while drying, and there is no need to crush small particles and very fine particles.