摘要
细长颗粒的循环流化在工业生产中具有非常广泛的应用,如生物质秸杆在循环流化床中的燃烧,烟丝在循环流化床中的干燥或加湿等。细长颗粒的流化特性受颗粒间碰撞及当地气场风速等因素的影响。文中根据刚体动力学及动量守恒定理,建立起颗粒–壁面碰撞三维数学模型,并采用此三维数学模型研究了壁面约束效应对细长颗粒流化特性的影响。研究发现,壁面对提升管内壁面附近区域的细长颗粒的取向分布及浓度分布均有明显的影响,并且,取向分布随径向位置变化规律也受壁面约束影响。
Circulating fluidization of slender particles is applied widely in industry including combustion of biomass stalks and drying or wetting of cut-tobacco. The fluidizing behaviors of slender particles in the gas-solid flows are affected by several influence factors such as inter-particle collision, local flow velocity and so on. The three- dimensional particle-wall collision mathematical models were founded in the light of the kinetic of rigid and the momentum conservation law, and the effects of wall on the fluidizing behaviors of slender particles in a circulation fluidized bed were studied by using the established three- dimensional mathematical models. It is found that the orientation distribution and concentration of slender particles in the riser is evidently affected by wall, especially in the regions near the wall, and the variation of orientation distribution of slender particles according to the radial positions of the riser is affected by wall too.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第23期71-74,共4页
Proceedings of the CSEE
关键词
循环流化
细长颗粒
流化特征
三维颗粒-壁面碰撞数学模型
壁面约束
circulating fluidization
slender particles
fluidizing behaviors
three-dimensional particle-wall collisionmathematical models
the effects of wall
