摘要
为了研究脉动流化床气泡特性,对流化床内气泡的特性进行了二维冷态模拟实验．利用摄像机捕捉流化床气固瞬间的流动状态,通过对图像进行分析,比较了脉动流化床和传统流化床内气泡尺寸,探讨了气泡平均上升速度和气泡尺寸受脉动参数和物料特性的影响．从实验可知,脉动气流可以抑制大气泡的形成,促进气固间的接触,且气泡的平均上升速度随脉动频率的增加有降低的趋势．
In order to study bubble behavior in a pulsed fluidized bed,experiments for bubble behavior in a two-dimensional pulsed fluidized bed （PFB） were carried out. The instantaneous state of gas-solid flows in fluidized bed was caught by means of camera. By the medium of analysis of the images,the bubble size along the PFB was compared with that in a conventional fluidized bed. The bubble size and rising velocity were affected by the pulse parameters and the particle properties by image analysis, Results show that pulsating stream is possible to restrain large bubble formation and promote gas-solid Contacting, And the bubble rising velocity was reduced with the frequency increased.
出处
《天津科技大学学报》
CAS
2007年第1期41-43,共3页
Journal of Tianjin University of Science & Technology
基金
天津市高等学校科技发展基金(20041208)
关键词
脉动流化
气泡
气泡上升速度
pulsed fluidization
bubble
bubble rising velocity
