Particle to Wall Heat Transfer in Circulating Fluidized Beds

CTS-9303695格力克斯曼计划的研究重点是床层流体动力对循环床壁面换热的影响。建议测量粒子群在壁面上的平均接触时间和粒子群在脱离之前落下的平均距离。几种不同壁面几何形状和粗糙度的结果将根据壁面上的团簇或层的稳定性进行比较。将观察到团簇沉积的机制及其大小，并与床的操作条件相关，从而确定壁面覆盖的比例。实验将在冷态模型上进行，以模拟流体力学，并确定床直径和核心/壁面相互作用的影响。然后，这些结果将使用先前验证的冷模拟定律外推到热床。

ABSTRACT CTS-9303695 Glicksman The proposed research focuses on the influence of bed hydrodynamics on the heat transfer occurring at the wall of circulating fluidized beds. It is proposed to measure the mean time of contact for a cluster of particles at the wall and the mean distance the cluster falls prior to being shed. The results for several different wall geometries and roughnesses will be compared in terms of a cluster or layer stability at the wall. The mechanism of cluster deposition and its magnitude will be observed and related to the bed operating conditions, allowing the fraction of the wall coverage to be determined. Experiments will be conducted on cold models to simulate the hydrodynamics and determine the influence of bed diameter and core/wall interactions. These results will then be extrapolated to hot beds using previously verified cold simulation laws.