Combustion – Process of combustion or burner operation – Flame shaping – or distributing components in combustion zone
Patent
1992-06-18
1993-08-24
Dority, Carroll B.
Combustion
Process of combustion or burner operation
Flame shaping, or distributing components in combustion zone
431351, 431354, F23M 304
Patent
active
052383962
ABSTRACT:
Fuel is burned in accordance with a burning method and apparatus in two stages and in the presence of first and second oxygen-containing gases, respectively. The second oxygen-containing gas has a higher concentration of oxygen than the first oxygen-containing gas. The fuel stream is burned in a first of the two stages at a first equivalence ratio sufficiently greater than 1.0, so that thermal NO.sub.x formation is inhibited, a more heat transfer effective luminous flame is achieved and a combustible mixture comprising unburned and partially oxidized fuel and fuel radicals is produced for combustion in the second of the two stages. The combustible mixture is burned in the second of the two stages at an equivalence ratio of no greater than about 1.0 so that maximum heat is transferred to the first of the two stages to stabilize combustion therein, and the fuel radicals are sufficiently oxidized by the second oxygen-containing gas to inhibit formation of prompt NO.sub.x.
REFERENCES:
patent: 4017253 (1977-04-01), Wielang et al.
patent: 4541796 (1985-09-01), Anderson
patent: 5104310 (1992-04-01), Saltin
patent: 5145361 (1992-09-01), Kurzinski
Cassett Larry R.
Dority Carroll B.
Rosenblum David M.
The BOC Group Inc.
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