F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
38/25
F27B 9/12 (2006.01) C21D 1/767 (2006.01) F27B 9/04 (2006.01) F27B 9/30 (2006.01)
Patent
CA 1229982
BILLET HEATING FURNACE WITH ADJUSTABLE PRESSURIZED ENTRANCE SEAL ABSTRACT OF THE DISCLOSURE A furnace (10) has a preheater zone (12) into which exhaust gases from a combustion chamber (14) are recycled for preheating of articles passing through the furnace. The exhaust gases are supplied to the pre- heater 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 The exhaust gases are withdrawn by a fan (30) which is disposed in a duct (34) adjacent to the furnace entrance (13).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 about atmospheric pressure, is provided within the preheater zone (12), with the chamber (56) pressurized by gases supplied by exhaust gases passing through a separate pipe (70) which has an adjustable valve (72) to adjust the pressure in the chamber (50). A sealing arrangement defined by the pressure chamber (56) and the articles passing through the furnace prevents the introduction of cool air through the pre- heater 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.
485965
Borden Ladner Gervais Llp
Granco-Clark Inc.
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