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One
of the most important challenges the
Libbey-Praxair team has been currently faced with
is the reduction of the NOx emissions by
25-35%. To make this possible, the project
team members have at present decided to use the
best-in-class burners.
OPTIFIRE™
JL burner is an ultra-low NOx, non-water-cooled
oxy-fuel burner that has been successfully
implemented in numerous glass melting furnaces.
The OPTIFIRE JL burner system is a staged
combustion burner which promotes combustion based
on Praxair`s Dilute Oxygen Combustion (DOC)
technology that injects fuel and primary oxygen
through one port and the majority of oxygen as
secondary oxygen through a separate port. The
reactants mix with the hot furnace gases before
reacting with each other. This dilution prevents
the high peak temperatures that are responsible
for thermal NOx generation.
The
rich primary zone stoichiometry produces a low
momentum high luminosity flame for high heat
transfer efficiency and the separate secondary
oxygen injection produces a long flame with a
higher oxygen concentration and a lower water
vapor concentration near the glass-melt surface.
The NOx emissions from the DOC-JL burner are less
than half of that of conventional oxy-fuel
burners.
Burner evaluation conducted by a third party shows
that Praxair’s OPTIFIRE-JL burner produced the
lowest NOx emissions.
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