O_2/CO_2条件下生物质焦和煤焦燃烧动力学特性

为得到富氧条件下生物质焦和煤焦的燃烧动力学特性规律,利用热重研究了麦秆焦,木屑焦以及烟煤焦在富氧气条件下的燃烧特性。实验结果表明:无论是生物质焦还是煤焦,相同的O2浓度下,O2/CO2气氛下焦样的着火相对于O2/N2气氛均发生了延迟,燃烧特性指数也均低于O2/N2气氛下对应值;在O2/CO2气氛和O2/N2气氛下,随着O2浓度的增加,焦样的着火温度均降低,燃烧特性指数增大,且提高O2浓度对煤焦着火的改善程度显著优于木屑焦。

Kinetics Investigation on the Combustion of Bio-char and Coal-char in the Atmosphere of O2/CO2

The characteristics of oxyfuel combustion of wood- char, straw- char and coal -char were carried out using thermo gravimetry （ TG）, and the kinetics characteristics of bio - char and coal - char during oxygen combustion was investigated. The TG experiments results show that, compared to O2/N2atmosphere, in the same O2 concentration, ignition of bio - char and coal - char were all delayed and the combustibility index was lower than that in O2/N2 atmosphere. With the increasing of O2 concentration, the ignition temperatures of bio - char were lower and the combustibility index increased both in O2/CO2 and O2/N2 atmosphere. Besides, it is easier for coal - char than bio - char to improve the ignition behavior by increasing the O2 concentration.