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Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.7 P.922~931

http://doi.org/10.1631/jzus.A0820034


Experimental study on the spatial distribution of particle rotation in the upper dilute zone of a cold CFB riser


Author(s):  Xue-cheng WU, Qin-hui WANG, Chen TIAN, Zhong-yang LUO, Meng-xiang FANG, Ke-fa CEN

Affiliation(s):  State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   fencewu@zju.edu.cn, qhwang@cmee.zju.edu.cn

Key Words:  Particle rotation, Gas-solid two-phase flow, Circulating fluidized bed (CFB)


Xue-cheng WU, Qin-hui WANG, Chen TIAN, Zhong-yang LUO, Meng-xiang FANG, Ke-fa CEN. Experimental study on the spatial distribution of particle rotation in the upper dilute zone of a cold CFB riser[J]. Journal of Zhejiang University Science A, 2008, 9(7): 922~931.

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author="Xue-cheng WU, Qin-hui WANG, Chen TIAN, Zhong-yang LUO, Meng-xiang FANG, Ke-fa CEN",
journal="Journal of Zhejiang University Science A",
volume="9",
number="7",
pages="922~931",
year="2008",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A0820034"
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%T Experimental study on the spatial distribution of particle rotation in the upper dilute zone of a cold CFB riser
%A Xue-cheng WU
%A Qin-hui WANG
%A Chen TIAN
%A Zhong-yang LUO
%A Meng-xiang FANG
%A Ke-fa CEN
%J Journal of Zhejiang University SCIENCE A
%V 9
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%P 922~931
%@ 1673-565X
%D 2008
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0820034

TY - JOUR
T1 - Experimental study on the spatial distribution of particle rotation in the upper dilute zone of a cold CFB riser
A1 - Xue-cheng WU
A1 - Qin-hui WANG
A1 - Chen TIAN
A1 - Zhong-yang LUO
A1 - Meng-xiang FANG
A1 - Ke-fa CEN
J0 - Journal of Zhejiang University Science A
VL - 9
IS - 7
SP - 922
EP - 931
%@ 1673-565X
Y1 - 2008
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A0820034


Abstract: 
particle rotation plays an important role in gas-solid flows. This paper presents an experimental investigation on the spatial distribution of average rotation speed for glass beads in the upper dilute zone of a cold circulating fluidized bed (CFB) riser. It is shown that in the horizontal direction, the average rotation speed in the near-wall area is larger than that in the center area, while in the vertical direction, it decreases as the height increases. The reason resulting in this distribution is analyzed by considering several factors including particle size, particle shape, particle number density, particle collision behavior, and the surrounding flow field, etc. The effects of CFB operation conditions on the spatial distribution of average rotation speed are also studied. The results show that the increasing superficial gas velocity increases the average rotation speed of particles in the near wall area but takes nearly no effect on that in the center area. The external solids mass flux, however, takes the opposite effect. It is found that the average rotation speeds of particles in both areas are increased as the total amount of bed material increases.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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