Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (10): 2293-2303.doi: 10.1016/j.cjche.2019.03.016

• Fluid Dynamics and Transport Phenomena • Previous Articles     Next Articles

LDV measurements of particle velocity distribution in an annular stripper

Yongzheng Li1, Xiaolai Zhang2, Guangwei Zhai3, Haitao Zhang1, Tao Li1, Qiwen Sun3, Weiyong Ying1   

  1. 1 Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
    2 School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;
    3 State Key Laboratory of Coal Liquefaction and Coal Chemical Technology, Shanghai 201203, China
  • Received:2018-09-26 Revised:2019-03-12 Online:2019-10-28 Published:2020-01-17
  • Contact: Tao Li
  • Supported by:
    Supported by the National High-Tech R&D Program of China (2011AA05A204) and the Fundamental Research Funds for the Central Universities (222201817013).

Abstract: Particle descent velocities in an annular stripper were measured by a laser Doppler velocimetry (LDV) system. In the radial direction, particle descent velocity was relatively constant in the mid-region of the stripper and increased towards the walls on both sides, exhibiting an anti-U-shaped distribution. Particle descent velocity in the radial mid-region increased with the increase of superficial gas velocity, and the maximum in the outer wall region increased significantly with the increase of solid mass flux. Superficial stripping gas velocity had stronger effect on particle velocity distributions near the stripper gas distributor, and such effect weakened with the increase of the distance from the distributor. Local particle velocity and its radial profiles could be adjusted by changing the superficial stripping gas velocity. Empirical formulas were established to describe the relationships between the local particle velocity and cross-sectional averaged velocity based on the effects of operating conditions and measuring positions. The result showed that the predicted data was in good agreement with the experimental value.

Key words: Annular stripper, Flow, Hydrodynamics, Particle velocity, Laser Doppler velocimeter