Heating – With means diluting – purifying or burning exhaust gases
Patent
1976-10-13
1979-02-20
Yuen, Henry C.
Heating
With means diluting, purifying or burning exhaust gases
432 59, 110204, F23J 1500, F27B 928
Patent
active
041404670
ABSTRACT:
A method of heat treating a workpiece, and an oven for carrying out the method in which, the gaseous atmosphere within each zone is continuously recirculated by recirculating fan and duct systems within each zone, and directed onto the workpiece, thereby losing heat to the workpiece, and coating thereon. A substantial proportion of the oven atmosphere containing solvent vapors is continuously passed through individual zone incinerators located within each of the oven zones, thereby oxidizing the solvent vapor content of such portion. The incinerated proportion of gases is then re-mixed with the untreated gaseous atmosphere prior to entry to the recirculating fan and duct system thereby re-heating the gaseous atmosphere to a controlled elevated temperature. Sufficient incinerated oxidized gas volume is recycled as ventilation in each zone to maintain a predetermined desired zone gas temperature and at the same time incinerate as much as possible of the solvent vapor content, thereby releasing the heat content of the solvent, without producing an excessive temperature rise. This clean recycled gas thus reduces the need for fresh air for oven ventilating purposes.
In one embodiment a further portion of the oven effluent containing solvent vapors, passes through a bypass incinerator and the oxidized gases then enter a radiant heating system which is in turn transmitted as radiant heat directly to the strip. The oxidized gases are then discharged from the radiant heater into the oven, providing additional ventilation.
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Ellison Kenneth
Whike Alan S.
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