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http://dx.doi.org/10.7464/ksct.2020.26.3.211

Study on Operating Characteristics for NOx Reduction in Ultra Low NOx Burner Combustion Using 80 kW Furnace  

Chae, Taeyoung (Clean Energy System Research Division Korea Institute of Industrial Technology)
Publication Information
Clean Technology / v.26, no.3, 2020 , pp. 211-220 More about this Journal
Abstract
This experimental study investigates the design parameters to achieve ultra low NOx combustion of coal using a 80 kW capacity single-burner furnace. The influence of key design parameters such as SN, overall and burner-zone equivalence ratios, primary/secondary air ratio, overfire air (OFA) ratio were tested for a total of 81 cases. The results showed that weak swirl intensity of the burner leads to higher NOx emission whereas strong swirl intensity accompanies increased CO concentration desipte lower NOx emission. Therefore, finding an appropirate swirl intensity is essential for the burner design. Larger flow rate of secondary air increased NOx emission, whereas smaller flow rate stretches the flame and increased CO emission. The lowest NOx emission of 82 ppm (6% O2) was achieved at the optimal condition of the present burner deisgn. It is expected to furrther lower the NOx emission by introducing splitting the burner secondary air into three or four streams.
Keywords
Coal; Combustion; NOx emission; Swirl number; Equivalence air ratio;
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