Classifying – separating – and assorting solids – Plural – diverse separating operations – Gaseous suspension and sifting
Patent
1992-09-10
1994-06-07
Olszewski, Robert P.
Classifying, separating, and assorting solids
Plural, diverse separating operations
Gaseous suspension and sifting
209 3, 209552, 209680, 209682, 209238, 209314, 209391, 209930, B07B 900
Patent
active
053181840
ABSTRACT:
A sludge drying system using exhaust air from a furnace in a direct heat, rotary drum dryer to simultaneously dry and pelletize the sludge. The dried sludge particles exiting the dryer is entrained in the exhaust air. The sludge particles are separated from the exhaust air and then classified according to size. The under sized particles are recycled back to a mixer for mixing with incoming wet sludge. The oversized particles are conveyed to a crusher or mill for reducing the oversized particles down to the desired product size. The medium-sized particles can be selectively directed to be recycled with the undersized particles or collected as product. The exhaust air is treated in a treatment section, and then divided into two exhaust air streams or portions. A first portion of the exhaust air is discharged into the environment, while the second, larger portion of the exhaust air is recycled back to the furnace to be used to dry the sludge in the drier.
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Olszewski Robert P.
Reichard Dean A.
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