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针对焦炭颗粒在煤粉炉内的复杂燃烧过程,建立相互耦合的导热、气相传质模型及改进的随机孔模型.通过FORTRAN编程,研究了焦炭颗粒在不同控制区域中的燃烧特性,应用改进的随机孔模型,研究了焦炭颗粒在扩散-化学反应动力学控制区中的燃烧特性.结果表明,在扩散-化学反应动力学控制区,碳基上的小孔内部存在O2浓度梯度,焦炭颗粒的转化速率在转化率约为0.39时出现最大值,随燃烧过程进行先增大后减小.
Aiming at the complicated combustion process of coke particles in a pulverized coal furnace, a coupled heat and mass transfer model and an improved random hole model are established.Based on FORTRAN programming, the combustion characteristics of coke particles in different control regions are studied, Random pore model was used to study the combustion characteristics of coke particles in the diffusion-chemical reaction kinetics control zone.The results show that in the diffusion-chemical reaction kinetics control zone, the O2 concentration gradient exists in the pores on the carbon-based particles and the coke particles The conversion rate at the conversion rate of about 0.39 when the maximum occurs, with the combustion process first increases and then decreases.