Challenge
The sawdust had a high initial moisture content and, once stockpiled, the moisture was uneven. Moving on to the next stage without reaching the target moisture made product quality inconsistent and the downstream process hard to control.
Solution
A rotary dryer was used to dry the sawdust with continuous tumbling, so that the rotating drum heated the material evenly and brought the moisture content into a suitable range. The heat source and drum size were set according to the site conditions.
Result
The sawdust reached the target moisture content, the downstream stage ran consistently and product uniformity improved.
Equipment in this case
Rotary Dryer
Capacity varies with operating conditions and is confirmed by a trial run; parameters fixed by machine size, such as air volume, can be stated precisely.
Related questions
Flash airflow dryer or rotary dryer: which one?
The two have different structures and suit different duties:
Flash airflow dryer
It dewaters through brief contact between high-temperature air and the material. Drying is fast, which suits inorganic salts and chemical powders that need rapid dewatering. Sizes are Φ220, Φ280, Φ325, Φ400, Φ500 and Φ600.
Rotary dryer
The rotating drum tumbles the material for more even heating. It suits sawdust, plastic pellets and flake materials that do not break up while tumbling.
How to decide
Look at the material form and whether it is sticky. Powders and fast-dewatering duties point to flash airflow; granular or flake materials needing even heating point to rotary. The moisture content and target final moisture still have to be considered.
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