NOx Solutions PRIMARY AND SECONDARY NOx REDUCTION TECHNOLOGIES
When a conventional SCR NOx reduction system is not practical due to space requirements, installation logistics or cost efficiencies, we offer a unique combination of technologies and engineering for cost-effective in-boiler NOx compliance.
Primary low NOx measures include our portfolio of cutting-edge low NOx burners. The low NOx concentric firing system (LNCFS*) for our OEM boilers and RSFC* and RoBTAS* burners for other manufacturers' boilers are commercially proven and cost-effective solutions for achieving significant NOx reductions, especially when combined with our overfire air systems.
A secondary reduction of up to 30 percent of NOx can be achieved with a selective non-catalytic converter (SNCR) system. This works by injecting urea or ammonia in the upper part of the furnace. At temperatures of 1500° to 2010°F, the NOx is reduced without the need for a catalyst. GE's Umbrella-SNCR (U-SNCR) is unique because the urea is sprayed within the furnace with a nozzle that is adjustable in height. The process uses cooled lances to carry flexible hoses arranged in the furnace. There are no boiler size constraints, and the technology is easy to control.