F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
126/69
F27B 3/22 (2006.01) B01D 53/86 (2006.01) F23G 7/06 (2006.01) F23L 15/04 (2006.01) F24H 3/04 (2006.01) F26B 23/02 (2006.01) F27D 17/00 (2006.01)
Patent
CA 1168942
RECIRCULATING AIR HEATER Abstract of the Disclosure A recirculating air heater for an oven is fired by a burner and connected with the oven by a re- turn air duct and an outlet duct. The return air duct has two sets of louvers for admitting controlled amounts of return air to a combustion chamber and a burner by- pass chamber in the oven. The combustion gases and re- turn air in the combustion chamber are mixed and direct- ed through a catalytic converter before being mixed with the return air in the burner bypass chamber and directed back into the oven. A portion of the gases directed through the catalytic converter are discharged to atmos- phere and an equal amount of preheated fresh air is admitted to the heater. The inlet and exhaust ducts are provided with blowers and dampers so that the mass flow rates of fresh air and exhaust air are substantially equal. During oven preheating some of the combustion gases and heated return air are caused to bypass the catalytic converter and flow directly back into the oven
403731
Marks & Clerk
Tri-Mark Metal Corporation
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