10. Combustion and Reacting Flows

A low-cost reduced kinetic mechanism, featuring 25 species and 136 reactions, was developed based on the GRI-Mech 3.0 and integrated into a tuyere-raceway model to assess its capability in predicting combustion characteristics of Coke Oven Gas (COG) compared to Natural Gas (NG). The study demonstrated that the reduced mechanism effectively predicts methane-hydrogen turbulent flames, with an average error of 7.67%, while reducing computational costs by approximately 50% with minimal accuracy compromise. The mechanism also successfully predicts significant soot formation as the NG injection rate increases. The findings suggest that enriching oxygen in the blast is more effective in reducing soot formation than preheating NG, with a 23.14% decrease in soot at 31% oxygen enrichment and a 13.95% reduction when NG is preheated to 400 K. Additionally, substituting NG with COG proved to be highly effective, reducing soot formation by 98.16% and increasing hydrogen availability in the raceway by 23.71% at equivalent mass flow rates.

Dr.

Bo-Jhih Lin