图像技术在非均匀布风流化床颗粒运动分析中的应用  

APPLICATION OF DIGITAL IMAGE TECHNOLOGY IN ANALYSIS OF PARTICLE MOVEMENT IN FLUIDIZED BED WITH UNEVEN AIR DISTRIBUTION

作　　者：田文栋[1] 魏小林[1] 孙满弟[1] 黎军[1] 吴东垠[1] 盛宏至[1] 

机构地区：[1]中国科学院力学研究所环境科学与技术中心,北京100080

出　　处：《力学与实践》2001年第3期35-38,共4页Mechanics in Engineering

基　　金：国家自然科学基金项目(59776023);中国科学院重点项目(KY95T-03-02)

摘　　要：通过实验得到了非均匀布风流化床内示踪颗粒在床层内的运动历程，以及床层内颗粒的浓度分布随时间的变化，并归纳得到颗粒在非均匀布风的内旋流流化床中不同区域的扩散系数．内族流流化床颗粒的纵向扩散系数和横向扩散系数大小相近，横向扩散系数明显大于均匀布风的鼓泡床的横向扩散系数，具有较好的横向扩散特性，有利于使流化床内横向不均匀的状况得到改善．The movement course of the trace particle and its concentration distribution change with time in the bed with an uneven air distribution of fluidized bed have been obtainea experimentally. And the particle diffusion coefficients of particles in different areas of this internal circulating fluidized bed are calculated. The results indicate that the lateral diffusion and axial diffusion have no apparent difference, and the value of the horizontal diffu- sion in the internal circulating fluidized bed is higher than that of the horizontal diffusion in the bubbling bed with an even air distribution. The concentra- tion of particles is ameliorated by the characteristics of the horizontal diffusion of particles in the internal circulating fluidized bed.

关 键 词：非均匀布风 内旋流流化床 扩散 图像分析 颗粒运动 

分 类 号：TQ051.13[化学工程] TQ021.4