method for processing sewage sludge

Details method for processing sewage sludge method for processing sewage sludge

1979-10-04

1981-07-07

Schwartz, Larry I.

Furnaces

Process

Treating fuel constituent or combustion product

110347, 110205, 110216, 110222, 110224, 110238, F23B 700

Patent

active

042768357

ABSTRACT:
A method for drying sludge which may contain combustible vapors in a manner to positively prevent fires and explosions within the sludge dryer and the associated sludge-drying piping. The method provides for a substantial reduction of the oxygen content of the sludge-drying vapors by deviating a part of the sludge-drying vapor stream from the principal vapor circuit and passing it as secondary combustion air into the combustion chamber which generates hot gases for drying the sludge. Furthermore, a portion of the hot effluents from the combustion chamber is deviated from the sludge-drying circuit and is used to heat the sludge-drying vapors whereafter it is vented to the atmosphere. In a variant of the invention, an acid scrubber is provided to remove hydrochloric acid. A number of embodiments is presented.

REFERENCES:
patent: 2032402 (1936-03-01), Colby et al.
patent: 2066418 (1937-01-01), O'Mara
patent: 2148447 (1939-02-01), Dundas et al.
patent: 3572665 (1971-03-01), Vincent
patent: 4169418 (1979-10-01), Cottrell et al.

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