Furnaces – Refuse incinerator – Refuse suspended in or supported by a fluid medium
Patent
1989-11-21
1991-03-05
Favors, Edward G.
Furnaces
Refuse incinerator
Refuse suspended in or supported by a fluid medium
110110, 110223, 110346, 241280, F23G 500, F23G 700
Patent
active
049969307
ABSTRACT:
A method for incinerating contaminated soil or other material utilizing an incinerator, such as a CBC, which is operated below atmospheric pressure and apparatus for carrying out such decontamination by delivering the soil to be processed in desired particulate size to the incineration unit, e.g., to a recirculation loop through which separated solids are being returned from a cyclone to a CBC. The system for supplying the contaminated soil is isolated from the chute leading to the incineration unit by a feeder that forms an agglomerated plug which serves as a pressure seal and prevents any gas flow therepast. Illustrated are a pair of twin counterrotating screws which include shafts that extend past the ends of the screw flights to locations where rotary cutters having multiple blades are mounted. Soil being carried between the flights of the rotating screws continuously agglomerates to form a plug at the downstream end which continuously advances toward the cutter blades that slice it into chips of desired thickness, which then pass through all or a portion of a pug-mill before entering a chute leading to the incinerator. The screws and rotary cutters are advantageously mounted on common shafts so as to allow longitudinal adjustment of the distance between the cutter and the screw to vary the length of the plug.
REFERENCES:
patent: 3921545 (1975-11-01), Ruegsegger
patent: 4493270 (1985-01-01), Gamroth
patent: 4553285 (1985-11-01), Sachs et al.
patent: 4702177 (1987-10-01), Narisoko et al.
patent: 4803836 (1989-02-01), Blanton et al.
Ives et al., PCB Remediation in Alaska, PCB Forum, Aug. 1989, pp. 1-20.
Ogden Environmental Services, Circulating Bed Combustion (Brochure), no date.
Egli Walter
Johanson Niles W.
Yip Harry H.
Favors Edward G.
Ogden Environmental Services, Inc.
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