| OCR Text |
Show 2 short temporal and small spatial extent to mix before reaction [6]. This results in a distribution of fuel-air "packets" of varied equivalence ratios that are present in the reaction zone. If the system is made overall lean to achieve NOx reduction, fuel lean packets will become even more lean and some may not ignite. Packets that do not ignite will pass through the system partially oxidized and degrade efficiency. If flue gas is added, highly fuel lean packets may again pass through the system unprocessed even though NOx is reduced. As urban areas move to reduce the levels of NOx, attention will be directed toward novel burners designs that can minimize the production of NOx without sacrificing combustion efficiency. Current policies in California, for example, now reflect this trend due to the high emissions of NOx in the South Coast Air Basin [7]. The present paper explores whether, for a given load, fuel and air mixing strategies can be identified that lead to a reduction in both NOx and CO. EXPERIMENT A specially designed, 30 kW (100,000 BtuIhr) natural gas fired burner is used for these experiments. A team of burner designers, identified in the acknowledgments, was formed to assure that the burner reflected practical characteristics. A schematic of the burner geometry is shown in Fig. 1. Figure 1: Model Industrial Burner |
