Heating – Work chamber having heating means – Combustion products heat work by contact
Patent
1980-05-27
1982-01-05
Camby, John J.
Heating
Work chamber having heating means
Combustion products heat work by contact
34242, 432176, 432179, 432194, 432242, F27B 304
Patent
active
043091717
ABSTRACT:
A furnace (10) has a preheater zone (12) into which exhaust gases of a combustion chamber (14) are recycled for preheating of articles passing through the furnace. The exhaust gases are supplied to the preheater zone (12) through jet pipes (18) which create a turbulent flow about the articles in the furnace (10). The exhaust gases are withdrawn by a fan (30) which is disposed in a duct (34) adjacent to the furnace entrance (13). To prevent the introduction of ambient air into the furnace (10), a pressure chamber (56), which is maintained at an elevated pressure relative to the ambient air, is provided within the preheater zone (12), with the chamber (56) pressurized by gases supplied by the jet pipes (18). A sealing arrangement defined by the pressure chamber (56) and the articles passing through the furnace prevents the introduction of cool air through the preheater zone (12). In this way, the thermal efficiency of the fuel burned within the combustion chamber (14) is maximized while a pressure balance is maintained in the furnace.
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Camby John J.
Gaffin Richard A.
Granco Equipment, Inc.
McGarry John E.
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