Fuel in a Rotary Kiln calcination, the addition of the pile will be present in all, the process will go Rotary kiln angle of repose has formed, in which case it will lead to the addition of fuel to the Rotary kiln appeared to move .Feeding tube Rotary kiln lower during installation, Rotary kiln for returning materials hinder the effect will be better, so we can lengthen feeding tube into the distance through the Rotary kiln and the Rotary kiln wall and between the shortened feeding tube Distance to achieve this purpose. Feeding tube Rotary kiln located at the centerline of the Rotary kiln, which is mainly based on the thickness of the material layer to determine the installation height feeding tube.The actual Rotary kiln, the cross-section of the material will be under certain conditions, and the material was a certain angle, and therefore, when the outflow of material from the feeding tube into the Rotary kiln is a certain height, then the material in scattered the state will have a moment of vacant, will take flue gas manufacturing process materials of opportunity, at this time, regardless of the flow rate of the flue gas is greater than or equal to the running speed of the suspension when the material, the material will be because the role of the flue gas into the settling chamber.