There are two major types of dryers: Direct and Indirect Dryers. Direct Dryers utilize hot air as the mechanism of water evaporation while Indirect Dryers utilize rotating heated surfaces to transmit heat into the wet product. The most common dryers are Direct Dryers that use natural gas to heat the drying air. It is important to keep in mind that there’s no one-size-fits-all dryer option that’s used for every application. In this article, we will concentrate on different Direct Dryers that can dry a wet solid feed material.
In an eNewsletter article for Powder and Bulk Engineering, we explained the advantages of circular fluid bed dryers and coolers versus those that are rectangular in shape.
Vibratory fluid bed dryers and coolers are gaining popularity in a large number of applications thanks to their rapid drying times and suitability for heat-sensitive products. Fluid bed dryers/coolers offer batch and continuous processing capabilities, allowing high throughput for drying and heating applications. In this article, we discuss the differences between circular and rectangular fluid bed dryers, as well as a number of considerations when choosing between circular or rectangular designs.