Abstract: In the design of fluidized-bed units, determination of TDH (Transport Disengaging Height) for the dilute-phase zone appears to be of primary importance. Presently, the empirical curve developed by Zenz and Weil in 1958 has been widely used. In the present paper, taking the equation for the motion of single particles as the basic starting point, methods for calculating gas velocity, particle velocity, and particle stagnation time and rising height in gas-solid flow, have been developed through theoretical analysis, resulting in an eight-parameter expression, Equation(15), for computing TDH. This equation includes more parameters than given in any previous work, and conforms much better with experimental results. It is, henceforth, recommended for design work.

摘要： 流化床设计时,稀相段输送分离高度(TDH)的确定极为重要.以前,一直沿用Zenz(1958)提出的经验线图.本文从单颗粒运动方程出发,通过理论解析,发展了气固二相流气体速度、颗粒速度、颗粒停留时间和上升高度的计算方法,导出了包括8个参数的TDH新关联式,它比前人的研究结果包含的参数更多、更为接近实际,为流化床设计提供了依据.