摘要
油页岩的燃烧过程是复杂的.基于热重燃烧曲线,可将油页岩的燃烧过程分为低温阶段、过渡阶段和高温阶段3部分:低温阶段为均相燃烧,高温阶段为多相燃烧,而过渡阶段则为高温阶段的多相燃烧准备条件.本文建立了高温段的多相燃烧模型:在能量方程中耦合了颗粒与外界环境之间的对流和辐射换热;低温阶段挥发分的大量释放使得油页岩内部孔隙增大,因而考虑了颗粒内表面积对碳的燃烧反应速率的影响;同时也考虑了挥发分和固定碳的燃烧对油页岩固体颗粒密度的影响.模型的计算结果与实验数据相吻合.
Combustion process of oil shale is complex. Based on thermogravimetric combustion curves, whole combustion process of oil shale is divided into three steps： low-temperature stage with homogeneous combustion, high-temperature stage with heterogeneous combustion, and transitional combustion stage preparing for the heterogeneous combustion. A new mathematical model is developed for the heterogeneous combustion： convective and radiative heat transfer between particle and ambient are included in energy equation; the effect of inner surface area on combustion reaction rate is considered ; the influence of volatile and fixed carbon combustion on particle density has been considered in the model as well. At last, the model is validated by thermogravimetric experimental data.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2007年第9期1470-1472,共3页
Journal of Harbin Institute of Technology
基金
国家自然科学基金资助项目(50476021)
关键词
油页岩
高温段
多相燃烧
燃烧模型
oil shale
high-temperature stage
heterogeneous combustion
combustion model
