高浓度丙酮VOCs高温预热近极限贫燃预混火焰特性的数值分析

The flame characteristics of an acetone VOCs incinerator at different fuel equivalence ratios and preheating temperatures are simulated to optimize its design and operation parameters. The factors of adiabatic flame temperature, ignition delay time, flame propagation velocity and one-dimensional flame product distribution are analyzed. The results show that the adiabatic flame temperature at the typical equivalence ratio (about 0.113) is 850-900℃, which belongs to medium-to-low temperature combustion. The influence of preheating temperature and chemical equivalence ratio on the ignition delay time is very significant. Under the typical fuel-lean condition, the laminar flame propagation speed increases exponentially with the increase of preheating temperature and slowly with the increase of chemical equivalence ratio, and the laminar flame propagation speed does not exceed 150cm/s. The decomposition and partial oxidation of acetone take place firstly, which can last for a long time. Only when the temperature of the mixture increases high enough, the more intense oxidation of CO takes place.