Furnaces – With exhaust gas treatment means – Afterburning means
Patent
1977-10-20
1980-03-18
Sprague, Kenneth W.
Furnaces
With exhaust gas treatment means
Afterburning means
110222, 110179, 110193, 110234, F23G 512
Patent
active
041933540
ABSTRACT:
A waste disposal system for the thermal conversion of municipal and industrial solid wastes into essentially pollution free products of combustion is disclosed. The waste disposal system includes a building enclosure having an interior storage area for accumulating combustible refuse, and an incinerator for thermally oxidizing the refuse. In a preferred embodiment, the incinerator includes a combustion chamber which is maintained at a reduced pressure level relative to the pressure of the surrounding atmosphere. This subatomspheric pressure arrangement produces a positive flow of air into the chamber as it is loaded thereby permitting loading during combustion virtually without risk of injury to personnel or damage to surrounding combustible material. In another preferred embodiment, the incinerator includes a primary combustion chamber which is maintained in an excess air condition as combustion occurs, and a secondary combustion chamber into which an auxiliary source of fuel such as natural gas is injected. Heat energy is recovered by conveying the exhaust gases from the secondary combustion chamber through a steam generator for the production of steam to operate an industrial process or for the operation of a steam turbine prime mover for generating electricity. The rate at which auxiliary fuel is injected into the secondary combustion chamber is controlled to ensure complete combustion of the exhaust gases to meet environmental standards, and to sustain the generation of a predetermined minimum level of heat energy in the exhaust gases for supporting the continuous production of steam to compensate for a temporary shortage of refuse derived fuel.
REFERENCES:
patent: 2000296 (1935-05-01), Osborn
patent: 2869487 (1959-01-01), Sherman
patent: 3323475 (1967-06-01), Melgaard
patent: 3403643 (1968-10-01), Denig
patent: 3602161 (1971-08-01), Wyrough
patent: 3670669 (1972-06-01), Hoad
patent: 3792671 (1974-02-01), Woods
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