Heating – Processes of heating or heater operation – Controlling flame position or work atmosphere
Patent
1998-02-26
1999-09-21
Walberg, Teresa
Heating
Processes of heating or heater operation
Controlling flame position or work atmosphere
432 20, 431 8, F27D 706
Patent
active
059544988
ABSTRACT:
Burner firing method and device are presented where an oxidizing oxygen-fuel burner is fired at an angle to the reducing air-fuel burner flame to reduce overall NOx emissions from high temperature furnaces. The oxidizing oxy-fuel burner stoichiometric equivalence ratio (oxygen/fuel) is maintained in the range of about 1.5 to about 12.5. The reducing air-fuel burner is fired at an equivalence ratio of 0.6 to 1.00 to reduce the availability of oxygen in the flame and reducing NOx emissions. The oxidizing flame from the oxy-fuel burner is oriented such that the oxidizing flame gas stream intersects the reducing air-fuel flame gas stream at or near the tail section of the air-fuel flame. The inventive methods improve furnace temperature control and thermal efficiency by eliminating some nitrogen and provide an effective burnout of CO and other hydrocarbons using the higher mixing ability of the oxidizing flame combustion products. The simultaneous air-fuel and oxy-fuel burner firing can reduce NOx emissions anywhere from 30% to 70% depending on the air-fuel burner stoichiometric ratio.
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Joshi Mahendra L.
Jurcik, Jr. Benjamin J.
Simon Jean-Francois
American Air Liquide Inc.
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
Walberg Teresa
Wendt Jeffrey L.
Wilson Gregory A.
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