Abstract
This paper presents the effect of slight mass flow rates of soot injection on the temperature profile, NOx formation, flame color, CO and CO2 formations, in the air flow inlet of a natural gas-fired laboratory cylindrical furnace. The experimental measurements were carried out using S-type thermocouple to show the temperature and Testo-350 XL gas analyzer for monitoring the concentration of NOx. The sprint CFD code was developed and used for the simulation of processes inside the furnace. The predicted temperature and NOx profiles show reasonable agreement with the experimental data. The results show that 0.012 soot mass fraction injection reduces the peak flame temperature by 211 K (2,238–2,027), while the temperature of other points does not change significantly. Furthermore, the soot injection decreases the peak of NO concentration one-tenth and exhausts NO one-sixth. In addition, the results depict that soot injection creates a yellow flame for natural gas combustion.
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