Appeal No. 2004-0539
Application No. 09/921,254
small nitrogen oxide (NOX) emissions. In column 1, lines 20-40,
Bury notes two different known ways for limiting the maximum
flame temperature of a burner and thereby reducing the content of
nitrogen oxides in the flue gases. In the first of these
approaches, Bury indicates that it is known to reduce the content
of free oxygen in the gaseous fuel flame to avoid too strong a
combination of the oxygen with the nitrogen in the combustion air
and to limit the maximum flame temperature by recycling a portion
of the inert flue gases generated in the combustion chamber to
mix with the combustion air prior to its entry into the
combustion chamber. In particular, it is noted that it is known
to realize this recycling by means of gaseous fuel ejection
systems associated with venturi-type intake conduits for the flue
gases, which utilize the low pressure created by the ejection of
the fuel gas. The second known approach noted in Bury for
reducing the maximum flame temperature is by staggering the
combustion, that is, instead of presenting the totality of the
combustion fuel and the combusting agent in a single zone, the
introduction takes place in various stages.
In column 1, lines 41-44, Bury indicates that an object of
the invention therein is "to provide a gas burner which combines
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