These dryers have been applied in a wide variety of drying operations from the food industry items such as seeds and grains to the chemicals and minerals industry.Dryers are available in different materials of constructions including carbon steel, special low alloy steels, stainless steel 304 and 316.Optimized use of heat input with suitable cocurrent or counter current flow characteristic,Various heating mediums can be used. Direct fired, CNG operated burners, indirect steam and tube type dryers, and electrically heated operating systems among the options.