Heating – Work chamber having heating means – Interior bell forms muffle
Patent
1985-03-05
1986-02-04
Yuen, Henry C.
Heating
Work chamber having heating means
Interior bell forms muffle
432 72, 432153, 432143, 432144, F27B 900, F27B 1100
Patent
active
045682798
ABSTRACT:
This invention relates to a muffle furnace, for continuous heat treatment during passage of material therethrough, of products, the production cycle of which includes a treatment of predetermined duration at a temperature which may be about 1100.degree. to about 1150.degree. C., which furnace is heated by a flame producing burner without the combustion gases directly contacting the products to be treated. This furnace comprises: an inlet zone provided with a means for preheating, by circulating recycled combustion gases in a double casing provided around the muffle; a heating zone, provided inside a heat-insulated chamber provided with at least one means for circulating combustion gases around the heating zone of the muffle; and an outlet zone provided with at least one means for controlling the cooling rate of the treated product. For the heat treatment of refractory or carbon-containing products, impregnated with a carbon-containing material such as pitch, the pyrolysis of which produces combustible vapors, the heating zone is divided into three sections by means of an additional partition: a zone for exuding and removing volatile materials from the pitch; a zone for pyrolyzing and carbonizing the pitch; and a final firing zone.
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patent: 4285325 (1981-08-01), Belloff
Logue Michel
Sadzot Maurice
Societe des Electrodes et Refractaires Savoie
Yuen Henry C.
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