Back to results
US 4,213,407 AGranted
Flash drying sludge derived fuel process
AssigneeHooker Chemicals & Plastics Corporation
InventorKenneth N. Headley
Life of this patent
Estimating the term…
Abstract
A process for disposing of sewage sludge resulting from municipal type sewage plants, including the production of dry solid fuel which is used in the flash drying and in the deodorizing system. Supplemental fuels are not required. The system is capable of producing a sludge derived fuel (SDF).
Claims10
A process for disposing of sewage sludge comprising the steps of:
- (a) introducing the sludge into a direct fired roller mill for drying, pulverizing, and classification, thereby producing a dried product and a water vapor containing exhaust gas,
- (b) conveying said product from the mill by the vapor exhaust gas stream of the mill to a product collector wherein a portion of said product is removed and supplied to a furnace as fuel,
- (c) superheating said vapor exhaust gas stream leaving the product collector prior to injection into said furnace by heat exchange in a vapor preheater with the furnace exhaust gases, and
- (d) conducting a portion of said furnace exhaust gases to said mill for heating and drying said sludge.
1 more element
Dependencies are inferred from the claim text.