Development of distributing device for large vertical dryer

In the process of drying, material distributing uniformity has a directly impact on the action effects of dry medium, then affects the drying uniformity of material. A distributing device which consisted of revolving distributing and reciprocating raking was designed to realize the uniformity. Single factor and orthogonal experiment were used to analyze the influence of device primary structure and technological parameters with the target of material surface flatness. The experimental results showed that the best parameters combination were at the distributing plate rotate speed of 50 r/min, the height of distributing plate of 680 mm, the installation angle of blade of 45°, under which the material surface was the most uniform and the coefficient of variation was 7.551%, and the minimum heights of material surface accounting for 62.58% of the maximum value. The designed distributing device can meet the requirements of distributing uniformity.