Countercurrent drum mixer with second heat source
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United States of America Patent
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Apr 13, 1993
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app pub date -
Sep 19, 1991
filing date -
May 15, 1989
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Abstract
An asphalt production system utilizing a pair of rotatable drums for producing an asphaltic composition is provided. The asphaltic composition is produced by separately heating a volume of virgin aggregate material in a countercurrent drum dryer and heating a volume of recycle material in a parallel flow drum mixer. The hot virgin aggregate material is mixed with the heated recycle material at an intermediate location within the parallel flow drum mixer. A ducting system is provided for interconnecting the ends of the drums such that the hot exhaust gases from one drum are circulated into the other drum thus producing a common flow of exhaust gases between the drums.
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