Drying and gas or vapor contact with solids – Apparatus – Gravity flow type
Patent
1989-04-11
1990-04-10
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Gravity flow type
34174, F26B 1712
Patent
active
049148346
ABSTRACT:
A grain column dryer which includes two concentric, cylindrical pervious walls and a pervious cone on top of the inner pervious wall, utilizes an impervious, heat insulated, cylindrical outer wall spaced outwardly from the pervious walls. A heater/blower assembly is supported on a substantially airtight impervious bulkhead in the center of the dryer to force heated air into an upper heated plenum and out through the concentric pervious walls and the pervious top cone, and to thereby draw air through lower portions of the pervious walls. A hottest air recycle collar is attached to the outer pervious wall above the bulkhead baffle and extends, in spaced relation to the outer pervious wall and to the outer impervious wall, to position well below the bulkhead baffle. The impervious outer wall terminates short of the bottom of the pervious walls so that heated air passes from above the bulkhead baffle down inside of the recycle collar and inside of the impervious outer wall and back through the pervious walls below the baffle to mix with ambient air drawn in through the pervious walls below the impervious outer wall.
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