Wet chopped hemp is fed by conveyor to an elevated airlock that is used to maintain an air seal for optimal energy efficiency. Chopped hemp drops through the airlock into fast moving hot air stream
that is heated by a high efficiency, low emission, in-line burner capable of increasing ambient air temperature to the optimum processing level.
The dryer drum rotates, showering product via lifting flights into the hot air stream where the most efficient drying is achieved, as opposed to lying against steel walls or piled up in a bed. The product moves quickly down inner cylinder of triple-pass dryer with smaller, dryer particles passing through more quickly and larger, wetter particles having longer travel times.
Hemp product makes two turns as it reverses direction from first pass outlet back toward inlet between the inner and intermediate cylinders and then again from inlet end back to outlet between the intermediate and outer cylinder.
Throughout the three passes, the product gives up its moisture into the hot air stream causing the hot air stream to cool. Properly – and easily – set temperature control on the dryer outlet prevents the product from getting too dry or too hot and outlet product temperatures are normally in the 100-110°F range. From the dryer, product is pneumatically conveyed to a separation cyclone with dry product exiting through another airlock and moist gases being vented to the atmosphere free of particulate and dust.