| 摘要 |
An immersion tube burner having stable ignition and flame over a wide range of firing rates. The burner includes a restriction orifice located between the fan and the burner nozzle for minimizing pulsations of air pressure fluctuations between the fan and nozzle. The orifice is sized so that the air velocity is greater through the orifice than at the nozzle so that any such pulsations are directed downstream of the nozzle rather than upstream, where they can affect the flame. The burner includes a burner nozzle having a cone shaped mixing plate. The angled shape of the plate re-circulates hot gases towards the base of the flame to thereby ensure more consistent ignition and combustion. The mixing plate further has holes arranged in primary and secondary zones. The holes of the primary zone are located within approximately five times the diameter of the 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 minimal mixing takes place inside the combustion chamber. Instead, the air and fuel from the secondary zone mix more completely in the immersion tube and subsequently combust. Accordingly, the present invention provides an immersion tube burner with improved flame stability during ignition and operation and improved control over the amount of combustion taking place inside the combustion chamber and the immersion tube.
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