化工学报 ›› 2010, Vol. 61 ›› Issue (5): 1262-1267.

• 能源和环境工程 • 上一篇    下一篇

锥形流化床混凝装置内混凝指标和絮凝体分形维数

王婷,周丹丹,董双石,郑文宇,杨毅   

  1. 吉林大学环境与资源学院;同济大学环境科学与工程学院; 中国市政工程东北设计研究院
  • 出版日期:2010-05-05 发布日期:2010-05-05

Flocculation parameter and fractal dimension model in a conical fluidized bed

WANG Ting,ZHOU Dandan,DONG Shuangshi,ZHENG Wenyu,YANG Yi   

  • Online:2010-05-05 Published:2010-05-05

摘要:

利用锥形流化床混凝工艺中固相颗粒的流化运动在液相中形成的微涡流,使液相中的胶体颗粒碰撞和聚集,形成絮体。结果表明在论文研究范围内,高岭土悬浊液去除率(23.97%~85.37%)随GT(1836.51~5399.53)增加而提高。G值的减小(169.2~189.7 s-1)和混凝时间增加都会引起混凝效率的升高。采用分形维数模型计算得到,相同运行条件下形成絮体的分形维数相关系数均在0.9以上,表明絮体性质具有相似性,因此相同操作条件下絮体自由沉降速度区间分布狭窄,相同沉速的颗粒数量百分比峰值达45%。

关键词:

锥形流化床, 混凝时间, 分形维数

Abstract:

Micro-vortex in liquid phase of conical fluidized-bed flocculation reactor, caused by fluidizing solid particles, was utilized to make colloids collision and aggregation, which results in the formation of flocs.When the value of GT increased from 1836.51 to 5399.53, the removal fraction (RF) of kaolin clay suspension increased from 23.97% to 85.37%.Also, The RF increased with the decreasing of G and the increasing of T, when G was within 169.2—189.7 s-1.According to the Fractal Dimension model, the correlation coefficient of flocs was above 0.9 at the similar operation conditions of reactor.This indicated the similarity of the flocs properties, which led to a narrow distribution of free falling velocity, and the maximum value of amount of flocs particles with the same falling velocity was up to 45%.

Key words:

锥形流化床, 混凝时间, 分形维数