Combustion – Process of combustion or burner operation – Flame shaping – or distributing components in combustion zone
Patent
1995-06-19
1997-11-18
Yeung, James C.
Combustion
Process of combustion or burner operation
Flame shaping, or distributing components in combustion zone
431115, 431190, 431278, F23M 300
Patent
active
056881150
ABSTRACT:
A method is disclosed for reducing NOx pollutants in the combustion of hydrocarbon fuels in a two stage burner. A first stage of combustion is established and maintained passing a stream of combustion air and first stage products of combustion down a centerline of the burner to a second stage downstream therefrom. This second stage is established by arranging an array of fuel tips around the first stage burner, each fuel tip having a fuel jet with a nominal trajectory angled toward the burner centerline and an inert gas jet placed between the burner and the fuel jet which is angled to cross the trajectory of the fuel jet. Fuel is injected into the second stage of the burner through the fuel jet and the inert gas, e.g. steam, is injected through the inert gas jet such that it influences the trajectory of the fuel to a modified fuel trajectory which is moved away from the centerline of the burner. Controlling the injection of the inert gas as a function of the firing rate for the burner allows the modified fuel trajectory to be moved progressively outward from the centerline of the burner across a range of increasingly higher firing rates. This reduces NOx production by moving the introduction of second stage combustion to a cooler and less oxygen rich area of the furnace as the furnace is progressively fired to greater heat outputs. Another aspect of the present invention is a low NOx burner.
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Shell Oil Company
Smith Mark A.
Yeung James C.
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