HiRAM ® LNI ™
HOW LNI WORKS
Low NOx Injection (LNI) of the fuel and air into the furnace chamber provides the highest potential efficiency and lowest NOx. The LNI system takes advantage of the largest source of “free” flue gas recirculation (FGR), the furnace itself, to produce uniquely low NOx emissions from high temperature systems. All NOx reduction strategies revolve around three basic principles: control of peak flame temperature, reduced in-flame oxygen concentration, and reduced in-flame residence time. The LNI system takes advantage of all three techniques resulting in extremely low NOx emissions, even for high temperature, high air preheat applications. The HiRAM LNI operates as a low NOx nozzle mix burner when the furnace temperature is below 1400 F. Above 1400 F, fuel is switched to strategically positioned nozzles adjacent to the burner tile port. The fuel and air jets entrain large volumes of products of combustion, greatly reducing the local oxygen concentration. In the flame envelope, these entrained gases limit maximum combustion temperatures to level out temperature spikes that generate high NOx emissions. All combustion takes place within the furnace, not inside the tile port, providing short high temperature residence times that inhibit NOx production. After combustion, the gases lose their heat through radiation and convective heat transfer to the work. These cooled gases travel throughout the furnace and are again entrained by the burner air and fuel jets, sustaining the NOx inhibiting process.
HIRAM LNI BENEFITS —Ultra-low NOx, even with 100% oxygen —Major fuel savings potential —Evenly dispersed hot gas radiation improves heating —High-velocity discharge for enhanced convection heating —Low emission are enhanced by proprietary control systems
LNI mix to 1400 F
LNI above 1400 F
POC
POC
POC
Air
Air
Air Air
Gas
Gas
LNI uses low NOx technology patented by Tokyo Gas Co. Ltd. of Japan and further developed by Fives North American Combustion, Inc., the exclusive world-wide licensee for use of this technology. U.S. Patent No. 4,945,841.
Gas
Optional Oxygen
CONTACT US: Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA Tel: +1 800 626 3477 - Fax: +1 216 373 4237 Email: fna.sales@fivesgroup.com
www.fivesgroup.com
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