The Simulations of Annulus-Core Structure in CFB

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The Simulations of Annulus-Core Structure in CFB

OUYANG Jie^a,b; LI Jinghai^b; SUN Guogang^c

^a Department of Applied Mathematics, Northwestern Polytechnical University, Xi’an 710072,
China;
^b Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China
^c Department of Chemical Engineering, University of Petroleum, Beijing 100083, China

Received:1900-01-01 Revised:1900-01-01 Online:2004-02-28 Published:2004-02-28
Contact: OUYANG Jie

CFB中环核结构的模拟

欧阳洁^a,b; 李静海^b; 孙国刚^c

^a Department of Applied Mathematics, Northwestern Polytechnical University, Xi’an 710072,
China;
^b Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China
^c Department of Chemical Engineering, University of Petroleum, Beijing 100083, China

通讯作者: 欧阳洁

Abstract

Abstract: In this paper, the stochastic particle-trajectory model is proposed for simulating the
dynamic behavior of circulating fluidized bed (CFB). In our model, the motion of solid
phase is obtained by calculating the individual particle trajectory while gas flow is
obtained by solving the Navier-Stokes Equation including two-phase interaction.For the
calculation of solid phase, the motion of each particle is decomposed into a collision
process and a suspension process. In suspension process, the less important and/or unclear
forces are described as a random force considering gravity, drag force and pressure
gradient. As a result, the proposed model gives some numerical simulations of CFB.It
indicates that the stochastic particle-trajectory model can be used to simulate
qualitatively the annulus-core structure of CFB and the influences of stochastic factors
cannot be ignored. In a CFB, the coupling of stochastic factors between two phases makes
the radial voidage decreased. Moreover, the upward motion of particles is mitigated by both
stochastic factors and turbulence between two phases.

Key words: simulation, two-phase flow, particle-trajectory model, fluidization, random force

摘要： In this paper, the stochastic particle-trajectory model is proposed for simulating the
dynamic behavior of circulating fluidized bed (CFB). In our model, the motion of solid
phase is obtained by calculating the individual particle trajectory while gas flow is
obtained by solving the Navier-Stokes Equation including two-phase interaction.For the
calculation of solid phase, the motion of each particle is decomposed into a collision
process and a suspension process. In suspension process, the less important and/or unclear
forces are described as a random force considering gravity, drag force and pressure
gradient. As a result, the proposed model gives some numerical simulations of CFB.It
indicates that the stochastic particle-trajectory model can be used to simulate
qualitatively the annulus-core structure of CFB and the influences of stochastic factors
cannot be ignored. In a CFB, the coupling of stochastic factors between two phases makes
the radial voidage decreased. Moreover, the upward motion of particles is mitigated by both
stochastic factors and turbulence between two phases.

关键词: simulation;two-phase flow;particle-trajectory model;fluidization;random force

OUYANG Jie, LI Jinghai, SUN Guogang. The Simulations of Annulus-Core Structure in CFB[J]. .

欧阳洁, 李静海, 孙国刚. CFB中环核结构的模拟[J]. CIESC Journal.

References

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