CFB密相区大颗粒横向扩散系数的CPFD模拟

doi:10.11949/j.issn.0438-1157.20170394

化工学报 ›› 2017, Vol. 68 ›› Issue (10): 3725-3732.DOI: 10.11949/j.issn.0438-1157.20170394

CFB密相区大颗粒横向扩散系数的CPFD模拟

张贤^1,2, 葛荣存^1,2, 张守玉¹, 刘青², 张缦², 杨海瑞², 吕俊复²

1 上海理工大学能源与动力工程学院, 上海 200093;
2 清华大学热能工程系, 北京 100084

收稿日期:2017-04-13 修回日期:2017-05-19 出版日期:2017-10-05 发布日期:2017-10-05
通讯作者: 吕俊复,lvjf@mail.tsinghua.edu.cn
基金资助:
国家重点研发计划项目（2016YFB0600201）。

Lateral dispersion coefficient of large solid particles in CFB dense zone using CPFD method

ZHANG Xian^1,2, GE Rongcun^1,2, ZHANG Shouyu¹, LIU Qing², ZHANG Man², YANG Hairui², LÜ Junfu²

1 School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2 Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Received:2017-04-13 Revised:2017-05-19 Online:2017-10-05 Published:2017-10-05
Supported by:
supported by the National Key Research and Development Program (2016YFB0600201).

摘要/Abstract

摘要：

运用一种离散单元法（DEM）计算颗粒流体力学（CPFD）对尺寸为900 mm×100 mm×1200 mm的准三维流化床的密相区大颗粒扩散行为进行研究。模拟之前，依照前人实验研究对CPFD方法进行验证，模拟结果与实验结果符合较好，证明了CPFD方法模拟的有效性。模拟中通过注入示踪粒子的方法来研究大颗粒在密相区中的横向扩散系数，研究了流化风速、颗粒直径对颗粒横向扩散系数的影响。模拟结果显示，气泡是引起密相区内颗粒混合的主要因素；随着流化风速增加，颗粒横向扩散系数变大；随着颗粒直径增大，颗粒横向扩散系数减小。

关键词: 流化床, 密相区, CPFD, 气泡, 扩散, 流化风速

Abstract:

Computational particle fluid dynamics (CPFD),a discrete element method (DEM),was utilized to simulate the lateral diffusion behavior of large solid particles in a 900 mm×100 mm×1200 mm quasi-three dimensional fluidized-bed.Before the simulating,verification had been performed in accordance with previous experimental studies to ensure the reliability of CPFD.The effects of the tracer particle diameter and the fluidizing air velocity on lateral dispersion coefficient of large solid particles in dense zone were investigated by the method of tracer particle.The results showed that the bubble behavior was the major factor of solid mixing in dense zone,which had been confirmed in many literatures.An increased gas velocity or a reduced tracer particle diameter resulted in an increased lateral dispersion coefficient.

Key words: fluidized-bed, dense zone, CPFD, bubble, diffusion, fluidization air velocity

中图分类号:

TK224.1

张贤, 葛荣存, 张守玉, 刘青, 张缦, 杨海瑞, 吕俊复. CFB密相区大颗粒横向扩散系数的CPFD模拟[J]. 化工学报, 2017, 68(10): 3725-3732.

ZHANG Xian, GE Rongcun, ZHANG Shouyu, LIU Qing, ZHANG Man, YANG Hairui, LÜ Junfu. Lateral dispersion coefficient of large solid particles in CFB dense zone using CPFD method[J]. CIESC Journal, 2017, 68(10): 3725-3732.

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CFB密相区大颗粒横向扩散系数的CPFD模拟

Lateral dispersion coefficient of large solid particles in CFB dense zone using CPFD method

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