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The Benefits Of Two-Stage Drying

By James Schak and Sunny Nwadinma, Kason Corp. |

Circular fluidized-bed dryers can boost the capacity, energy efficiency and product quality when used in conjunction with other primary dryers Two-stage drying provides benefits from the standpoints of cost, energy savings, efficiency and product quality. This is especially the case when a circular, vibrating fluidized-bed dryer is employed as the auxiliary dryer positioned downstream of a spray dryer, or upstream or downstream of a rectangular fluidized-bed dryer, rotary dryer, belt dryer or other drying equipment. Typical applications for two-stage drying include food products, such as flavors, yeast, starches, proteins, milk products and carbohydrates; organic products; agricultural chemicals; cellulose; fertilizers and other heat-sensitive products. In the milk industry, most spray dryers available today are two-stage dryers incorporating a fluidized bed dryer.   Spray dryer with 2nd stage The most common application for adding a second-stage dryer is with a single-stage spray dryer. Spray drying is relatively expensive in terms of capital investment, operational costs, installation and construction. Not only can a two-stage dryer reduce costs, but often can produce a lower heat history and a higher quality product. In…
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