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Floating the kiln

At the pelletising plant and i'm having a problem on the Kiln, especially when the load is increased. My question is what is the required speed if the tonnages are increased, this happen in a weeks time that caused the kiln to drift. The were damages incurred on the seal of the kiln and this created a down time on our production.

Axial travel of the kiln is caused by roller skew. Usually, for a fixed positive skew of the rollers, the kiln has a tendency to travel uphill with an increase of either or both kiln loading and speed of rotation. The roller skewing should be set to float the kiln at maximum speed and feed rate. Floating means moving gently between the thrust rollers. This is usually a very temporary, transient condition. As far as the speed and loading relationship is concerned I cannot be specific about that since I am not familiar with your process. One common practice, as in cement kilns for example, is to tie speed and feed rates together; as the feed is increased so is the speed. This results in a constant bed depth no matter what feed rate prevails. Other processes follow other conventions and so end up with different bed depths as the feed and or speed is changed.

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