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Show APPROACH The successful development of a 5 ppm NOx industrial burner technology will requ!r~ a. d minimization of all forms of NOx generation. Prompt and thermal NOx must be nunt~z: b d simultaneously while paying close attention to other lesser NOx contributors, such as t~lr ~ 0 y. This research program is designed to take advantage of both state-of-the-art chemical ki~~tlCS codes and experimental burner techniques. First, a baseline burner is chosen which e~hlb~ts I promising ultra low NOx performance, see Figure 1. Second, the burner is modeled kinetlcal Y and with CFD, and extensive experimental data are obtained to promote closure between the numerical and experimental data. A prototype burner design is then generated and inte~oga~ed both numerically and experimentally. Finally, the prototype burner is designed into a fIeld sIte for trials under actual user conditions. Baseline Burner Design: The baseline burner used to initiate this burner development program takes advantages of highly staged combustion design features for low NOx, (Lifshits, 1996). This burner uses bluff body stabilization as opposed to traditional swirl stabilized burner systems (Beer and Chigier, 1972; Gupta, et aI., 1984). The baseline burner'has three main combustion zones. A premixed inner zone is designed to operate with high excess air for low thermal and prompt NOx generation. The core zone provides a constant ignition source to the inner premixed combustion zone. Surrounding these two zones is the outer gas injection zone where pure fuel is supplied at high velocity to intensify the mixing of flue gases with the premixed zone flame and lower excess air. BASELINE BURNER (5 mmBtU/hr) PROTOTYPE BURNER (5 mmBtU/hr) FULL-SCALE BURNER (50 mmBtu/hr) • ~ KINETIC MODELING CHEMKIN GRI-Mech • ~ EXPERIMENTAL TESTING Figure 1: Research Approach |