These indirect cooling vibratory spirals incorporate very long cooling lengths and large surface areas for extended residence time for cooling of air sensitive granular solids, such as:
- rubber crumb
- granular chemicals products
- food products such as rice
The large spiral vibratory conveyors incorporate the manufacturer’s variable rate, tow mass, natural frequency drive technology to allow for fine tuning of the residence time for optimized cooling.
The cooling chambers can be totally enclosed and conditioned with air or inert gas purged as the application requires. Cooling spiral as shown above is 78 inches in diameter with a over all lift of 21 feet and is driven by two each 3 HP motors. This unit incorporates 240 square feet of cooling trough and 420 square feet of cooling surface area and uses cooling water flowing under the conveying trough for cooling of the granular solids in the pan.
What is Indirect Cooling?
In indirect cooling, a hot material is conveyed along a vibratory conveyor trough surface cooled on its underside by a completely segregated cooling medium flow stream such that the cooling medium “Indirectly” absorbs the heat given up by the hot material as it moves along the length of the conveyor trough. (Indirect heating can occur on a similar basis with hot water, steam, or other heated medium.)
Counter-flow of the two flow streams is typically employed to improve heat transfer efficiency. Although water (or steam) is the most common cooling (heating) medium, aqueous solutions of ethylene glycol, heating oils, and other mediums are used as well.
Indirect cooling is usually applied when the material is oxygen sensitive or categorized as a hazardous waste.
Construction may be carbon steel, stainless, or other metals.