| 摘要 |
A continuous flow grain dryer includes airflow paths such that air passes through a grain column twice prior to exiting the grain dryer or being recirculated. The dual pass airflow defines a preheat zone in an upper portion of the grain flow paths adjacent an exhaust plenum. A heat zone is defined in the grain flow paths adjacent a high heat plenum and below the preheat zone. The dual pass airflow defines a temper zone in the grain flow paths adjacent a return plenum and below the heat zone. A cooling zone can be defined below the temper zone and adjacent the return plenum. A recirculating airflow path can provide fluid communication from the return plenum to the fan and back to the heat plenum. The burner is positioned outside the airflow path to feed ambient air into the recirculating airflow path, without recirculating airflow passing through the burner. |
