Combustion – Flame holder having protective flame enclosing or flame... – Tubular member delineates flame
Patent
1997-09-23
1999-08-10
Yeung, James C.
Combustion
Flame holder having protective flame enclosing or flame...
Tubular member delineates flame
431181, 431187, F23D 1446
Patent
active
059348984
ABSTRACT:
A burner nozzle having stable ignition and flame over a wide range of firing rates. The nozzle has a mixing plate which has air holes arranged in separate primary and secondary zones. The holes of the primary zone are located within approximately five times the diameter of fuel outlet ports so that the fuel exiting such ports has sufficient velocity to optimize mixing. The holes in the secondary zone are located farther away from the ports so that complete mixing takes place downstream of the nozzle. As a result, the present invention provides a burner nozzle with improved flame stability during ignition and operation and improved control over the amount of immediate and downstream combustion. The division of the mixing plate into primary and secondary zones further provides increased control over the amount of immediate and downstream combustion taking place. For example, by locating a certain percentage of air hole area in the primary zone, a corresponding percentage of combustion will take place in that zone. The exact percentages of holes in the primary and secondary zones may be selected according to the application. The mixing plate of the nozzle also has a frusto-conical shape which re-circulates hot gases towards the base of the nozzle to thereby ensure more consistent flame ignition and combustion.
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Rhine, J.M. and Tucker, R.J., "Modeling of Gas-Fired Furnaces and Boilers" published in 1991, pp. 32-34.
Arutynov, V.A., Mitklinniy, U.I., and Stark, S.B., "Metallurgical Heat Technology, vol. 1, Fundamentals, Fuel and Refractory", published in 1974, pp. 242-244. A brief translation of the figures appearing on those pages is attached thereto.
Eclipse Combustion, Inc.
Yeung James C.
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