Sheet 4343-8 Page 2
NOx Levels vs. Furnace Temperature
Graph 2: NOx emissions for TwinBed II with LNI firing versus other regenerative burners using various amounts of flue gas recirculation (FGR).
required to accept the additional volume. Other regenerative burners use up to 50% FGR. LNI firing is the premier NOx inhibiting technology for industrial burners with the lowest NOx emissions. In comparison with flue gas recirculation (FGR), LNI’s NOx emissions are lower, fuel efficiency is higher, and the system is simpler. LNI dœs not require FGR’s additional piping, larger regenerators and blowers.
Graph 2 compares LNI NOx emissions with other regenerative burners that use varying amounts of flue gas recirculation (FGR). FGR involves adding furnace exhaust gas to the combustion air where the inert constituents reduce the rate and temperature of the combustion reaction. If added after the combustion air flows through the regenerator, FGR can reduce system thermal efficiency up to 15%. If added prior to the regenerator system, efficiency can be maintained, but larger regenerators are
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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