内旋流流化床中气泡运动规律研究  

Experimental Study on Bubble Characteristics in Internal Circulating Fluidized Bed

作　　者：田文栋[1] 魏小林[1] 孙满弟[1] 盛宏至[1] 

机构地区：[1]中国科学院力学研究所,北京100080

出　　处：《华北电力大学学报（自然科学版）》1999年第4期23-27,共5页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金;中国科学院重点项目资助

摘　　要：利用摄相机研究了内旋流流化床团相流场及气泡特性，结果表明：非均匀布风是形成内旋流的关键，最佳高风区、低风区流化倍率为初始流化速度的６倍和１．５倍：随着气泡的上升，其体积不断增大；体积越大，上升速度越快：上升速度随流化倍率的增加而迅速增大：气泡运动及大、小气泡的汇合促进了固体颗粒的上升运动。实验结果表明气泡是产生内旋的一个重要因素。The particle flow field and bubble characteristics in Internal Circulating Fluidized Bed (ICFB) havebeen investigated experimentally by CCD camera. Results show that the uneven distribution of fluidized air isthe key of forming internal circulation. The optimum fluidized number ratio of high velocity air to low velocityair is 6umf: 1.5umf. With rising the bubbles rising, the bubble volume increase of and the bigger the volumeis, the quicker the bubble rises. And the bubble rising velocity increases quickly with increasing the fiuidizednumber. Particle rising movements have been induced by bubble movement and merging of small bubbles andthe big bubbles. Anyway, the bubbles are important to leading the internal circulation.

关 键 词：流化床 移动床 气泡运行 固相流 

分 类 号：O359[理学—流体力学] TQ051.13[理学—力学]