Particle to Wall Heat Transfer in Circulating Fluidized Beds

开发商业规模的工厂，使用循环 流化床（CFB）燃烧由于缺乏 了解热的基本机制 转移 这项工作集中在热传递从 与床壁接触的颗粒， 和知之甚少的组成部分，在循环流化床的传热。 控制传热过程的参数正在被 在现有的20 cm CFB测试设施中使用 颗粒传感器和电容探针，用于各种不同的 颗粒和流化条件与床层有关 流体力学 传热系数为 预测并与实际传热测量结果进行比较。 这项工作将使人们更好地了解 之间的传热和流体力学循环流化床的，并帮助 循环流化床燃烧室传热表面的设计。

Development of commercial-scale plants using circulating fluidized bed (CFB) combustion has been hindered by a lack of understanding concerning the basic mechanisms of heat transfer. This work concentrates on the heat transfer from particles in contact with the wall of the bed, an important and poorly understood component of heat transfer in CFB's. The parameters controlling the heat transfer process are being measured in an existing 20 cm CFB test facility using a particle sensor and capacitance probe for various different particles and fluidization conditions and related to the bed hydrodynamics. The heat transfer coefficient will be predicted and compared to actual heat transfer measurements. This work will produce an increased understanding of the link between heat transfer and hydrodynamics in CFB's, and aid the design of heat transfer surfaces in CFB combustors.