循环流化床内局部颗粒混合特性的研究

为了研究流化床内固体粒子的混合特性，从固体粒子运动速度的脉动特性和浓度分布出发，提出了局部颗粒混合因子的概念及数学模型。并利用高速摄影CCD和相关分析等图像处理方法对该模型进行了试验验证和分析。从试验结果来看：混合因子的分布与粒子混合的剧烈程度有较好的对应关系，描述了流化床投影面上粒子的混和特性。在实现上，计算混合因子所需要的信息全部来自粒子运动图像，属于非接触测量，易于在线分析。因此，该因子可以作为一个定性参数来描述流化床内局部区域粒子的混合特性。图6参11

Study of Local Particles' Mixture Property in CFB

In order to study solid particles' mixing mechanisms inside fluidized bed,the comcept of local particles' mixing factor and model were introduced to describe particle's mixing behavior according to particle's velocity perturbation and density distribution. High speed CCD instruments and image processing methods including image correlation analysis were used to evaluate the model. Experiments results show that mixing factor's distribution well described the particle's mixing character in CFB's projection side. The realization of mixing factor was based on images analysis method, belonging to non-intruded techniques, available for on-line measurement. So the mixing factor could be used as a qualitative parameter to describe particle's mixing character in CFB. Figs 6 and refs 11.