Radiation efficiency and structure of flames stabilized inside radiant porous ceramic burners

摘要

The first measurements of temperature and species distributions within submerged flames stabilized inside radiant burners made of reticulated ceramic matrices are reported. The radiant burners and the flames stabilized within them are characterized in terms of stability limits, radiation efficiencies, and global pollutant emission indices. A counter-intuitive tendency of the burners to flashback at the highe firing rates is reported. The temperature and species profiles show that the reaction zone is very broad and that the tendency to flashback results from higher preheating of the unburnt mixture. Quenching near the ceramic matrix strands was observed from local temperature and species data. The NO_x emission indices of these burners are very low and CO and HC emissions are not high but could be improved.