Journal of the Korean Society of Combustion ISSN:1226-0959(Print) 2466-2089(Online) 한국연소학회지

This paper was performed to investigate the effect of various ambient conditions on the biodiesel NOX formation characteristics. To achieve this, a closed homogeneous batch reactor model of CHEMKIN-PRO was used for the biodiesel combustion analysis and, surrogate fuels for the biodiesel combustion was consisted of n-heptane, methyl decanoate and methyl-9-decenoate. As a result of analysis, NOX production increases with increase of ambient temperature and pressure, and NOX production was the highest at Φ=0.7 of equivalence ratio condition. However, after the Φ=0.7 of equivalence ratio condition, it was confirmed that the decrease in NOX formation was caused by the lack of oxygen as the equivalence ratio was increased. In the biodiesel combustion, the main chemical reactions of NOX production is dominated by the thermal mechanism, and other NOX production is generated by the reaction mechanisms including N2O mechanism and HO2 radical.