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Vladimir Lifshits
The paper describes the development process of a new Coen low NOx high
performance burners and the transition from a successfully tested prototype
to a commercially available product . The performance data are illustrated
by the results achieved at the test facility and in numerous package and
field erected boilers. The burner was the first commercial product that
could fire Natural Gas with NOx emissions below 30 ppm and low carbon
monoxide emissions without the use of flue gas recirculation (FGR) in
a wide variety of package boilers. For the boilers with low space heat
release rates the burner achieves even lower NOx in the range 15-20 ppm.
The burner is specifically suited for industrial duty applications, as
it does not impose any special requirements to the control system, like
tight air fuel ratio, O2 trim, etc. The burner achieves 10 to 1 turn down
and with some modifications allows turn down in the excess of 15 to 1.
The burner can easily fire other gaseous fuels like refinery gas and does
not require special gas preparation, as the typical minimum diameter for
the gas discharge is more than 1/8”. The versatility of the burner is
also enhanced by its ability to operate with induced or selective FGR
as it allows NOx reduction down to the 12-15 ppm level. While most of
the burner performance can be realized when firing gaseous fuel, liquid
fuels like #2 and #6 oil can also be fired separately or simultaneously
with gas. Change over between fuel can be done on line.
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