Method and apparatus for drying granular resin material by drawing vacuum over heating resin material in a vessel, while periodically purging the vessel with the material therein with dry air and bathing the vacuum dried material with dry air until furnished to a processing machine.

Method and apparatus for drying granular resin material by drawing vacuum over heating resin material in a vessel, while periodically purging the vessel with the material therein with dry air and bathing the vacuum dried material with dry air until furnished to a processing machine.

A system for drying grain in a storage bin, having an air injector for injecting external air into the bin interior to displace moist warm air toward an air extractor and the air extractor for extracting moist warm air from the bin interior and directing it outside the bin.

Method and apparatus for drying granular resin material by heating compressed air to a temperature prescribed for gas separation membrane operation, presenting the heated compressed air to a membrane separating out oxygen-size and smaller molecules to provide a stream of gas molecules of at least nitrogen-size at a pressure substantially that of the compressed air, heating the stream of gas molecules of at least nitrogen-size to a temperature at which dew point of the stream is no higher than 40 degrees F., and introducing the heated stream of gas molecules into a chamber for upward flow to atmosphere through granular resin material in the chamber.

Method and apparatus for drying granular resin material by heating compressed air to a temperature prescribed for gas separation membrane operation, presenting the heated compressed air to a membrane separating out oxygen-size and smaller molecules to provide a stream of gas molecules of at least nitrogen-size at a pressure substantially that of the compressed air, heating the stream of gas molecules of at least nitrogen-size to a temperature at which dew point of the stream is no higher than 40 degrees F., and introducing the heated stream of gas molecules into a chamber for upward flow to atmosphere through granular resin material in the chamber.

An improved grain dryer is presented having a mixed-flow heating section having a plurality of inlet ducts connected to the plenum that facilitate air flow into the grain column from the heated and pressurized heat plenum, and a plurality of exhaust ducts connected to openings in the exterior wall that facilitate air flow out of the grain column. Outer most ducts of the inlet and exhaust ducts, which are positioned closest to end walls of the grain column, are configured to reduce bridging or grain between the outer most ducts and the end walls of the grain column.

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.

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.

Method and apparatus for drying granular resin material by drawing vacuum over heating resin material in a vessel, while periodically purging the vessel with the material therein with dry air and bathing the vacuum dried material with dry air until furnished to a processing machine.

Method and apparatus for drying granular resin material by drawing vacuum over heating resin material in a vessel, while periodically purging the vessel with the material therein with dry air and bathing the vacuum dried material with dry air until furnished to a processing machine.