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›› 2011, Vol. 11 ›› Issue (6): 933-937.

• 流动与传递 • 上一篇    下一篇

基于LED光源反射的液固搅拌槽中颗粒悬浮特性测定的光纤法

周宏宝 李向阳 杨超 毛在砂 张广积   

  1. 中国科学院过程工程研究所，中国科学院绿色过程与工程重点实验室 中科院过程工程研究所 中国科学院过程工程研究所 中国科学院过程工程研究所 中国科学院过程工程研究所
  • 收稿日期:2011-09-15 修回日期:2011-10-26 出版日期:2011-12-20 发布日期:2011-12-20
  • 通讯作者: 周宏宝

An Optic Method Based on LED Reflection for Measurement of the Characteristics of Particle Suspension in a Liquid-Solid Stirred Tank

ZHOU Hong-bao LI Xiang-yang YANG Chao MAO Zai-sha ZHANG Guang-ji   

  1. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences Institute of Processing Engineering ，CAS
  • Received:2011-09-15 Revised:2011-10-26 Online:2011-12-20 Published:2011-12-20
  • Contact: ZHOU Hong-bao

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摘要： 提出一种基于LED光源反射的液固搅拌槽中固体颗粒悬浮特性测定的光纤法. 在直径0.38 m、底部为椭圆形的搅拌槽中，用该法对水-二氧化硅两相体系固体颗粒悬浮特性进行了测定. 结果表明，测量临界离底悬浮转速Njs的测量点应选择在搅拌槽下部区域，径向位置对Njs影响不大；在整个固含率范围内，光纤测量法与取样法测量结果较接近，平均相对误差为4.0%，目测法测定结果比取样法与光纤测量法稍高，光纤法比取样法更快速、简便，具有适用于不透明容器的优势，能快速测定最小均匀悬浮转速Nus，Nus随固含率增大而增大.

关键词: 离底悬浮, 均匀悬浮, 光纤法, 目测法, 取样法, 液固搅拌槽

Abstract: An optic method based on LED reflection was proposed for determination of the characteristics of particle suspension in a liquid-solid stirred tank. The characteristics of particle suspension in water-silica two-phase system in an oval-bottomed stirred tank of 380 mm in diameter were measured using this method. The results show that appropriate location of measuring point for critical impeller speed Njs should be in the lower part of the tank and the radial position has little effect on Njs. Njs obtained by the optic method was close to that obtained by the withdrawal sampling method in the whole range of solid loading and the average relative error between them was only 4.0%. Njs obtained by the visual observation was bigger than those from other two methods. The optic method can be operated faster and more easily than the withdrawal sampling method and applied in opaque vessels compared with the visual observation. Nus quickly determined by the optic method is bigger with higher solid loading.highest material flow rate 500, 620 and 820 m3/h, separately. Based on the transport characteristics and pressure gradient trend along the conveying direction, the pipeline could be divided into developing, transition and developed sections.

Key words: off-bottom solid suspension, homogeneous solid suspension, optic method, visual method, withdrawal sampling method, liquid-solid stirred tank

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