Abstract: A NOx removal system for a furnace or boiler with an economizer has two separate ammonia injection grids (AIG) upstream of an SCR. A primary AIG is positioned adjacent the flue gas outlet of the economizer and upstream of an economizer bypass outlet. A secondary AIG is located within an economizer flue gas bypass. The separate AIGs permit a reduction in the overall length of the flue between the economizer and SCR, thereby reducing the NOx removal system footprint, cost and quantity of materials.

Abstract: A dual-fluid low pressure drop atomizer utilizes extended wear life material and comprises a nozzle head having a chamber therein for receiving a mixture of a first compressible fluid and a second fluid containing solids. The nozzle head also has an orifice therein communicating with and adjacent to the mix chamber for discharging jets of the mixture. The orifice and the mix chamber form an approximate right angle therebetween. An inner barrel is connected to the nozzle head at the mix chamber and supplies the first fluid to the nozzle head. An outer barrel is arranged around the inner barrel creating an annulus therebetween and is also connected to the nozzle head for supplying the second fluid to the nozzle head. Wear resistant material provided in the mix chamber reduces erosion within the atomizer head. A plurality of ports are provided in the nozzle head and communicate with the orifice for discharging a jet at a multiplicity of locations.