Heating – Tumbler-type rotary - drum furnace – Having combustion products generated in or fed to drum
Patent
1991-10-01
1993-04-20
Yuen, Henry C.
Heating
Tumbler-type rotary - drum furnace
Having combustion products generated in or fed to drum
432118, 432115, 34136, F27B 714
Patent
active
052036936
ABSTRACT:
A rotary drum dryer is disclosed which is useful in the production of asphalt paving composition. The drum incorporates a burner which defines a combustion zone, and a novel dam and flight construction is mounted to the interior of the drum so that the flights surround the combustion zone. The dam is adapted to retain and raise the level of the aggregate flowing through the rotating drum so that the flights pass through the aggregate in the bottom of the drum, and the flights collect a portion of the aggregate on their top surfaces and carry the collected aggregate to an elevated discharge point, where the aggregate drops back to the bottom of the drum. The flights serve to shield the metal wall of the drum from the radiant heat energy of the burner flame which would otherwise result in its rapid deterioration, and they also serve to permit the aggregate to be effectively exposed to the radiant heat. The fact that more radiant heat energy is transferred to the aggregate, serves to further lower the temperature of the metal wall of the drum. Still further, the fact that the flights pass through the aggregate and are covered by the aggregate through a substantial portion of their circular path of travel, results in the flights being exposed to less radiant heat energy and thus subject to less deterioration.
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Astec Industries Inc.
Yuen Henry C.
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