F - Mech Eng,Light,Heat,Weapons – 23 – J
Patent
F - Mech Eng,Light,Heat,Weapons
23
J
126/15
F23J 15/00 (2006.01) F23C 13/00 (2006.01) F24H 3/06 (2006.01) F27B 17/00 (2006.01)
Patent
CA 1101748
RECIRCULATING PROCESSING OVEN HEATER ABSTRACT OF THE DI CLOSURE A recirculating processing oven heater including a di- rect fired burner for heating processing gas and a catalytic con- verter downstream from the burner for removing unburned combus- tible gas and providing additional heating prior to delivery of the processing gas to an associated processing oven. A housing of the heater defines first and second parallel paths along which the gas flows between an inlet and an outlet thereof and the burner and catalytic converter are located along the first path to heat gas flowing therealong while mixing of the gas downstream therefrom at a junction of the two paths provides heating of the gas that flows along the second path. The rela- tive mass flow rates of gas flowing along the first and second paths is adjustable by a control valve mechansim including first and second adjustable valves at the inlet of the heater housing. Each valve preferably includes a plurality of dampers and an adjustable actuator that positions the dampers. The ac- tuator for the first valve is power operated in response to the temperature of processing gas within the associated oven fed by the heater while the actuator of the second valve is manu- ally adjustable. Inner and outer housing portions of the heater housing have hollow elongated shapes with round cross sections and are arranged in a coaxial relationship such that the inner housing portion defines the first gas flow path and the space between the inner and outer housing portions defines the second gas flow path. An upstream end of the inner housing portion receives the burner while a downstream end thereof mounts a con- ical mixing member for causing mixing of the gas from the two paths within a mixing chamber defined by the outer housing por- tion adjacent the downstream end of the inner housing portion. An adjustable fresh air inlet in the outer housing portion, an- nular baffles along the first and second gas flow paths, and a blower within the outer housing portion downstream from the mix- ing chamber cooperate with the other components of the heater during its operation to provide efficient heating of processing gas for delivery to the oven.
269871
Gladd Industries Inc.
Smart & Biggar
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