So you are in need of a rotary dryer. Where do you go from there? There are a lot of factors that come into play when determining the needs of a rotary dryer, and determining your needs can easily become overwhelming. Take it a step at a time: we’ve developed this series to help you understand what goes into sizing a rotary dryer, and what might best suit your needs. At FEECO, we custom design our rotary dryers based around the material and its ideal feed rate through a rotary dryer.
The first and most important aspect in sizing a rotary dryer is defining the needs and limitations of the material to be worked with. The first variable in this equation is the percentage of moisture the material holds in its “raw” state, or the state at which it will go into the dryer. Similarly, it is necessary to know the percentage of moisture desired in the end product, also called the “outlet moisture.” This difference in actual vs. desired percent moisture in part determines the design of the dryer. Let’s use laundry as an example. If you have a load of jeans that you just pulled out of the washer, and they are soaking wet, their percentage of moisture is going to be quite high, therefore requiring a long period of time in the dryer. However, if you forgot about them on your laundry room floor for a day and they’ve had a chance to air dry, their percentage of moisture is going to be much lower, so you know you don’t need to put them in the dryer for as long, and the dryer does not need to work as hard to dry them.
Be sure to stay tuned for the next part of the series: a feature on Bulk Density.
FEECO Rotary Dryer Series: