chapter  17
14 Pages

FLAME SPEED CONTROL USING A COUNTERCURRENT SWIRL COMBUSTOR

Legislative restrictions on pollutant emissions have motivated the combustion

community to seek new low-emission combustion techniques that are practical

industrial energy sources. However, to meet the needs in most industrial applica-

tions, a combustion source needs to be able to maintain low-emission output over

a range of heat release rates, occupy minimal volume, and have low operating

costs per unit energy produced. One would like to maximize the turn-down

ratio, volumetric heat release, and overall thermal eÆciency while minimizing

NO

x

, CO, and hydrocarbon emission levels. The ultra-low NO

x

emission per-

quirements have been discussed [1]. This paper focuses on turbulent ame speed

control to achieve reasonable turn-down ratios and volumetric heat release rates

while maintaining low NO

x

output.