Furnaces – Process – Incinerating refuse
Patent
1993-02-09
1994-10-25
Favors, Edward G.
Furnaces
Process
Incinerating refuse
34216, 110224, 110227, 110228, 110238, 110186, F23G 704
Patent
active
053578813
ABSTRACT:
This invention comprises a combined cellulose sludge dryer and burner in which the drying procedure is positively and automatically controlled in response to the moisture content of the dewatered raw sludge supplied to the dryer headbox and carried through a drying chamber to discharge a dried sludge having but a 15% moisture content and suitable to be burned to provide the hot air for the drying procedure. With the sludge being critical as to charring, a temperature of 300 degrees Fahrenheit to prevent pre-burning and charring of the sludge has to be maintained in the drying chamber and positive and automatic control for the hot air to maintain the temperature is done by checking differences between input and output temperatures of the dryer and diluting the air produced by the burner by the use of a heat exchanger and air dampers. The extracted wet air from the drying chamber and diverted over-supply of air to the drying chamber are delivered through a scrubber and chimney to the atmosphere. A series of opposing hot air and wet air extracting ducts are provided in the drying chamber for the handling of the drying air to direct it from beneath the travelling wire screen conveyor through the sludge particles thereon and passed to the extracting air ducts thereabove whereby to increase speed for drying sludge and the efficiency of temperature control equipment. Programmable computers are included to establish the control requirements and maintain the desired temperatures throughout the drying and burning operations.
REFERENCES:
patent: 4643108 (1987-02-01), Singelyn et al.
patent: 4827853 (1989-05-01), Emery
patent: 5191845 (1993-03-01), Spliethoff
patent: 5233763 (1993-08-01), Minnie, Jr.
Devine John J.
Dunn Kurt T.
Elcik Andrew W.
Healey John F.
Northrop John H.
Favors Edward G.
Jones Stanley R.
Northrop Engineering Corporation
Saulsbury Laforest S.
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