摘要
通过简化求解离心流化床连续介质模型基本控制方程,获得了初始流化速度、压力、空隙率、空隙气速、床层膨胀和床层压降的计算方程式。理论预报的临界流化速度和床层压降与实验结果吻合得很好。揭示了离心流化床随流速增大由表面逐层初始流化;流化后各半径处流化程度不同。理论分析还表明气体压缩性的影响随着床体转速的增大而增大。
The equations to calculate incipient fluidizing velocities, pressure, voidage, interstitial gas velocity, bed expansion and pressure drop in centrifugal fluidized beds are obtained by simplifyirg and solving the governing equations based on the interacting continua theory. The predictions of the pressure drop across the bed and the critical fluidizing velocity agree well with the expeririental results. The theoretical analyses show that the granules centrifugal fluidized bed is gradually fluidized layer by layer, from the inner surface outward, in the range of the gas velocities. When fluidization is achieved, the fluidization degree for each bed layer at the different radial positions is different. The influences of gas compressibility on the behaviour of the bed increase with the increase of rotational speed of bed.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1997年第2期152-159,共8页
CIESC Journal
基金
国家教委博士点基金资助项目(No.9428617)
