Particle to Wall Heat Transfer in Circulating Fluidized Beds

循环流化床中的颗粒到壁的传热

• 批准号: 9303695
• 负责人: Leon Glicksman
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-15 至 1998-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9303695&HistoricalAwards=false
• 关键词: Particle; Wall; Heat; Transfer; Circulating

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.

摘要 CTS-9303695 Glicksman 本文主要研究循环流化床床层流体动力学对床层壁面传热的影响。 建议测量颗粒团在壁上的平均接触时间以及颗粒团在脱落之前下落的平均距离福尔斯。 几个不同的壁的几何形状和粗糙度的结果将在一个集群或层的稳定性在墙上进行比较。 集群沉积的机制和它的大小将被观察到，并与床的操作条件，允许壁覆盖率的分数被确定。 将在冷模型上进行实验，以模拟流体动力学并确定床直径和芯/壁相互作用的影响。 这些结果将被外推到热床使用以前验证的冷模拟法律。