Abstract: A device for drying grain includes a housing having an inlet port and an outlet port, a first passageway, a second passageway, a grain flow housing, a filter across the grain flow housing, a recovery column, an air supply, a recycle column, a filter cleaner in the recovery column, and a conveyor for moving the filter cleaner along the filter. The air supply pulls an air flow into the housing through the inlet port as a grain flow pours through the grain flow housing. The air flow passes through the grain flow in a first pass air flow from the passageways to dry the grain. The first pass air flow passes through the filter to remove particles, and a portion of that filtered first pass air flow is recycled back with the filter cleaner to dislodge particles clogging the filter. The other portion is vented through the outlet port.

Abstract: The method for filtering an air flow in a grain dryer to permit recycling of the air includes entering an external air flow into the grain dryer; pouring a grain flow by gravity into the grain dryer; passing the external air flow through the grain flow in a direction substantially perpendicular to the direction of the grain flow; filtering the air flow after passing through the grain flow so as to retain particles present in the air flow; heating the filtered flow and directing the filtered flow upstream of the grain flow, such that the filtered flow passes again through the grain flow; and blowing the particles proceeding from the filtering. The invention also relates to a device for implementing this method.