A fundamental CFD study of the gas-solid flow field in fluidized bed polymerization reactors

TY - JOUR

T1 - A fundamental CFD study of the gas-solid flow field in fluidized bed polymerization reactors

AU - Chen, Xi Zhong

AU - Shi, De Pan

AU - Gao, Xi

AU - Luo, Zheng Hong

N1 - Funding Information: The authors thank National Natural Science Foundation of China (Nos. 20406016 , 21076171 ) and China National Petroleum Corporation for supporting this work. We would also like to thank Dr. Fox R.O. and Dr. Ram G..R. (Department of Chemical & Biological Engineering, Iowa State University) for their valuable discussion in this work. The authors also thank the anonymous referees for comments on this manuscript.

PY - 2011/1/10

Y1 - 2011/1/10

N2 - A Eulerian-Eulerian model incorporating the kinetic theory of granular flow was applied to describe the gas-solid two-phase flow in fluidized bed polymerization reactors. The model parameters were examined, and the model was validated by comparing the simulation result with the classical calculated data. The effects of distributor shape, solid particle size, operational gas velocity and feed manner on the flow behavior in the reactor were also investigated numerically. The results show that with the increase of solid particle diameter, the bubble numbers decrease and the bubble size increases, resulting in a smaller bed expansion ratio. Bed expansion ratio increases with increasing the gas inlet velocity. Moreover, the final fluidized qualities are almost the same for the plane distributor case and the triangle distributor case. There exists a tempestuous wiggle from side to side in the bed at the continuous feed manner, which could not be obtained at a batch feed manner.

AB - A Eulerian-Eulerian model incorporating the kinetic theory of granular flow was applied to describe the gas-solid two-phase flow in fluidized bed polymerization reactors. The model parameters were examined, and the model was validated by comparing the simulation result with the classical calculated data. The effects of distributor shape, solid particle size, operational gas velocity and feed manner on the flow behavior in the reactor were also investigated numerically. The results show that with the increase of solid particle diameter, the bubble numbers decrease and the bubble size increases, resulting in a smaller bed expansion ratio. Bed expansion ratio increases with increasing the gas inlet velocity. Moreover, the final fluidized qualities are almost the same for the plane distributor case and the triangle distributor case. There exists a tempestuous wiggle from side to side in the bed at the continuous feed manner, which could not be obtained at a batch feed manner.

KW - CFD

KW - Flow characteristics

KW - Fluidized bed reactor

KW - Model and operation parameters

KW - Polyolefin

UR - http://www.scopus.com/inward/record.url?scp=78049297484&partnerID=8YFLogxK

U2 - 10.1016/j.powtec.2010.09.039

DO - 10.1016/j.powtec.2010.09.039

M3 - 文章

AN - SCOPUS:78049297484

SN - 0032-5910

VL - 205

SP - 276

EP - 288

JO - Powder Technology

JF - Powder Technology

IS - 1-3

ER -