CO2가 CH4/Air 대향류 확산 화염의 구조 및 NOx 생성 특성에 미치는 영향

초록

This study is to investigate the effect of CO2 addition on the structure and NOx formation characteristics in CH4 counterflow diffusion flame. The effect of CO2 addition is examined as thermodynamic and chemical reaction effect respectively by introducing the imaginary nonreactive molecule X, whose characteristics is the same as CO2 except reactiveness. The results show that. In changing flame temperature, the strain rate effect is dominant at high strain rate, but radiation heat loss effect is dominant at low strain rate. This effect are intensified when CO2 is added. This change is attributed mainly to thermodynamic effect. But partly to chemical reaction effect, which is caused by CO2 intervention of oxidation. As a result of chemical reaction effect, production rate of CH is reduced and so the N, HCN, which are the sources of prompt NOx, and thus NOx concentration is decreased. But NOx reduction is mainly due to thermodynamic effect of CO2.