Abstract
The effects of the following burner design factors on the emissions of NO2, NOX, CO, and hydrocarbon were investigated: cap material, cap size, port shape, port size, port spacing, central secondary aeration, and flame insert. The approach used in this study was designed to overcome the possibility of ambiguous or contradictory conclusions encountered in earlier studies. The factorial experimental design method was used to arrange the experiments, and the results were statistically analysed using the analysis of variance. Flame stability was found to be crucial; a slight instability promoted a large increase in emissions of CO, hydrocarbon, and NO2. Port shape was found to be the most significant burner design factor affecting the emissions, and hence it is a potential factor to be studied further for lower emissions.
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