Abstract
In the present study, chemiluminescence analysis is used to determine the optimum range for equivalence ratio (Φ) in a multi-hole cylindrical burner. The premixed burner which uses natural gas is widely applied in gas condensing boilers and is examined here by Flame Emission Spectroscopy (FES). A spectrometry setup was implemented to capture emission of the burner, in order to detect OH*, CH*, C2*, and CO2* species by their chemiluminescence. The emission of OH* and CO2* was investigated for different equivalence ratios and burner power showing a peak in the lean ranges of Φ = 0.77–0.85 and 0.78–0.85 respectively, that corresponds to the maximum heat release rate. In addition, the OH*/CH* intensity ratio was investigated for range of Φ = 0.6–1.2 for all burner power, resulting in a power independent relation for OH*/CH*. It can be used as a tool to derive equivalence ratio from the OH*/CH* ratio. Moreover, the maximum surface temperature of the burner in power range occurred at Φ = 0.82 in a promising agreement with chemiluminescence peaks of OH* and CO2*. The main contribution is to find the optimum range of equivalence ratio corresponding to the maximum heat release rate.
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