Swenson Technology, Inc. products

Swenson’s fluid bed dryers are the best choice for applications where optimum heat transfer efficiency is required for the drying process.

The Swenson flash dryer is suitable for drying a wide variety of materials. The product is dried in a hot gas stream which pneumatically conveys the material through the body of the dryer. This unique feature of the flash dryer allows the dryer to be positioned near the process while the product storage area may be as far as 200 feet away. In a flash dryer, the product is in intimate contact with the gas stream for a very short time. The flash dryer is, therefore, ideally suited for removing free moisture from the surface of the material being dried.

Shell and tube heat exchangers are used for most of Swenson installations. The heating medium is typically steam which is normally condensed on the outside of the tubes to heat the liquor or slurry which flows inside the tubes. Both vertical and horizontal tube heat exchangers are utilized. While vertical exchangers are the most common type, horizontal exchangers are used for installations with limited headroom or where maximum liquor submergence is needed to prevent surface boiling and subsequent salt precipitation on the tubes. Heat exchangers are typically one or two passes and are designed for relatively low temperature rises in the solution. This limits the supersaturation of scaling components when heating materials with inverted solubility. In most applications, the steam-to-liquid delta-T is also limited to prevent mass boiling within the tubes or vaporization at the tube wall.