The effect of boundary layer flow on incinerator efficiency

摘要

Incinerators operating with excess air, a core temperature of about 1100K, and a residence time of 1-2 s should give essentially complete destruction of all organic pollutants exposed to these conditions. However, about 1% of the gas flows in the cooler boundary layer near the wall, where reaction occurs at a much lower rate. The decrease in reaction rate is partially offset by the lower velocity and by mass transfer of pollutant from the boundary layer to the core, but the overall effect is still a significant increase in the amount of unre-acted pollutant. The effects of wall and core temperature and mass transfer from the boundary layer on incinerator efficiency were examined by computer simulation using toluene vapor in air as an example of a polluted stream.