废轮胎热解半焦的单颗粒燃烧特性实验研究

Combustion Characteristics of Single Semi-Coke Particle Pyrolysed from Waste Tire

在单颗粒燃烧系统上研究了废旧轮胎热解半焦颗粒的燃烧特性,并探究了温度与颗粒粒径对燃烧的具体影响.结果表明,半焦颗粒在850℃及以下燃烧时经历挥发分析出及着火、挥发分燃烧、焦炭着火及焦炭燃烧4个阶段,在机理上属于典型的均质着火机理;在950℃以上时,焦炭着火早于挥发分着火,其着火机理转变为联合着火.此外,温度升高会缩短半焦颗粒着火时间等特征时间,而半焦颗粒粒径的增加则会增大挥发分火焰的体积并显著延迟焦炭的着火时间.研究结果为高效清洁利用轮胎衍生燃料提供了一定的基础研究数据.

In this paper,the combustion characteristics of a single semi-char particle pyrolysed from waste tire were investigated on a single-particle combustion system and the effects of combustion temperature and particle size were analysed. Results indicated that the combustion of semi-coke particle at temperatures of 850 ℃ and below underwent four stages,namely volatile release and ignition,volatile combustion,coke ignition and coke combustion,showing that the ignition mechanism is of classic homogeneous type. As the temperature increased to 950 ℃,coke ignited before volatile ignition,indicating that its ignition mechanism belongs to join the terohomogeneous mechanism. Moreover,an increase in combustion temperature would decrease the characteristic time such as ignition time,and an increase in particle size would increase the volume of volatile flame and delay the ignition time of coke significantly. This study provides fundamental research data for clean and effective utilization of tire-derived fuels.