循环流化床床层与壁面间传热特性的模拟分析

利用已建立的数学模型，对循环流化床床层与壁面间的传热特性进行了预测．分析了床层密度、床层温度、流化速度、颗粒粒径以及壁面长度等设计和运行参数对传热系数的影响．结果表明，床层密度越大或温度越高，传热系数越大；而颗粒粒径越大或壁面长度越大，传热系数越小；流化速度对传热系数则影响不大．

Simulation and Analysis of Bed to Wall Heat Transfer Characteristics in a Circulating Fluidized Bed

The bed to wall heat transfer characteristics in a circulating fluidized bed are predicted with a mathematical model already developed. The influences of the operating and design parameters, such as the suspension density, bed temperature, fluidization velocity, particle diameter and the wall length, on the heat transfer coefficient, are discussed. The results obtained show that the heat transfer coefficient increases with the suspension density and the bed temperature, and decreases with the particle diameter and the wall length. However, the fluidization velocity exerts little effect on the heat transfer coefficient. Abstract The bed to wall heat transfer characteristics in a circulating fluidized bed are predicted with a mathematical model already developed. The influences of the operating and design parameters, such as the suspension density, bed temperature, fluidization velocity, particle diameter and the wall length, on the heat transfer coefficient, are discussed. The results obtained show that the heat transfer coefficient increases with the suspension density and the bed temperature, and decreases with the particle diameter and the wall length. However, the fluidization velocity exerts little effect on the heat transfer coefficient.