[1]向文国,徐祥,肖云汉.循环流化床上升段流体动力特性数值模拟[J].东南大学学报(自然科学版),2005,35(5):752-756.[doi:10.3969/j.issn.1001-0505.2005.05.021]
 Xiang Wenguo,Xu Xiang,Xiao Yunhan.Fluid dynamics numerical simulation for riser of circulating fluidized bed[J].Journal of Southeast University (Natural Science Edition),2005,35(5):752-756.[doi:10.3969/j.issn.1001-0505.2005.05.021]
点击复制

循环流化床上升段流体动力特性数值模拟()
分享到:

《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
35
期数:
2005年第5期
页码:
752-756
栏目:
能源与动力工程
出版日期:
2005-09-20

文章信息/Info

Title:
Fluid dynamics numerical simulation for riser of circulating fluidized bed
作者:
向文国1 徐祥2 肖云汉2
1 东南大学洁净煤发电及燃烧技术教育部重点实验室, 南京 210096; 2 中国科学院工程热物理研究所, 北京 100083
Author(s):
Xiang Wenguo1 Xu Xiang2 Xiao Yunhan2
1 Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education, Southeast University, Nanjing 210096, China
2 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100083, China
关键词:
循环流化床 两相流 环核流动 计算流体力学
Keywords:
circulating fluidized bed two phase fluid model core-annulus fluid computational fluid-dynamics
分类号:
TK223.2
DOI:
10.3969/j.issn.1001-0505.2005.05.021
摘要:
针对循环流化床上升管内气固两相流动,建立了Eulerian双流体模型,将离散的固体颗粒相看作是连续介质,建立颗粒相和气相的质量守恒、动量守恒及k-ε输运方程等模型,用Fluent软件作计算工具,对流化床上升段内的颗粒速度分布、颗粒浓度分布和床内压力分布等进行了二维数值模拟.计算结果表明:上升段存在固体颗粒浓度中心区域低、近壁面高的环核结构,固体颗粒在横截面上存在由核心区向环形区的内循环运动,在相同气流速度下,沿床高压降随循环物料的增加而变大.数值模拟的结果与 Pärssinen的实验结果吻合良好,表明所建模型正确,数值计算结果可以有效地应用于预测实际装置性能和指导循环流化床的设计和运行.
Abstract:
The Eulerian two-fluid model is established to simulate the gas-particle turbulent flow in the riser section of a circulating fluidized bed(CFB)reactor. The particle flow in the riser is thought as a continuous phase. The model, based on mass equation, momentum equation, k-ε equation and constitutive relations, is coded and solved using Fluent software package to simulate the two-dimensional flow in a riser. The results show that the flow pattern in the riser section of a CFB consists of a core-annular flow regime in which the solid density near the wall region is higher than that at the center of the riser. The solid velocity is high at the center of the riser and solid down-flow at the wall regions. The particles move from the center to the annular zone in the same section and the pressure drop in the riser rises with the increase of circulating mass at the same inlet gas velocity. The computational values agree well Pärssinen’s experimental results. Eulerian models can be used to forecast the performance of a fluidized bed and to guide the operation of the actual device.

参考文献/References:

[1] Zheng Yu,Wan Xiaotao,Qian Zhen,et al.Numerical simulation of the gas-particle turbulent flow in riser reactor based on two-fluid model [J]. Chemical Engineering Science,2001, 56(24):6813-6822.
[2] Cabezas-Gomez Luben,Milioli Fernando Eduardo.Numerical study on the influence of various physical parameters over the gas-solid two-phase flow in the 2D riser of a circulating fluidized bed [J]. Powder Technology,2003,132(2,3):216-225.
[3] Benyahia S,Arastoopour H,Knowlton T M,et al.Simulation of particles and gas flow behavior in the riser section of a circulating fluidized bed using the kinetic theory approach for the particulate phase [J].Powder Technology,2000,112(1):24-33.
[4] Pärssinen J H,Zhu J X.Particle velocity and flow development in a long and high-flux circulating fluidized bed riser[J].Chemical Engineering Science, 2001,56(23):5295-5303.
[5] Gidaspow D,Bezburuah R,Ding J.Hydrodynamics of circulating fluidized beds,kinetic theory approach [A].In: Proceedings of the 7th Engineering Foundation Conference on Fluidization[C].Brisbane,1992.75-82.
[6] 徐祥,向文国,秦成虎,等.流化床密相区流动特性的数值模拟[J].热能动力工程,2004,19(2):131-133.
  Xu Xiang,Xiang Wenguo,Qing Chenghu,et al.Numerical simulation for flow characteristics in the dense-phase zone of fluidized bed[J].Journal of Engineering for Thermal Energy and Power,2004,19(2):131-133.(in Chinese)
[7] Zhan Xudong,Fan Jianren,Sun Ping,et al.Numerical simulation on dense gas-particle riser flow [J].Journal of Zhejiang University,2000,1(1):29-38.
[8] Taghipour Fariborz,Ellis Naoko,Wong Clayton.CFD modeling of a two-dimensional fluidized-bed reactor [EB/OL].http://tetra.mech.ubc.ca/CFD03/papers/paper29AF3.pdf.2003/2004-11.
[9] Lu Huilin,Gidaspow D.Hydrodynamics of binary fluidization in a riser:CFD simulation using two granular temperatures [J].Chemical Engineering Science,2003,58(16):3777-3792.
[10] 漆小波,黄卫星,潘永亮,等.循环流化床气固提升管内的颗粒浓度及环核结构研究[J].四川大学学报(工程科学版),2003,35(1):43-47.
  Qi Xiaobo,Huang Weixing,Pan Yongliang,et al.Investigation on solids concentration and core-annulus flow structure in circulating fluidized bed risers[J].Journal of Sichuan University(Engineering Science Edition),2003,35(1):43-47.(in Chinese)

相似文献/References:

[1]董长青,金保升,仲兆平,等.循环流化床掺烧生活垃圾实验研究[J].东南大学学报(自然科学版),2002,32(1):95.[doi:10.3969/j.issn.1001-0505.2002.01.022]
 Dong Changqing,Jin Baosheng,Zhong Zhaoping,et al.Experimental study on the co-firing of municipal refuse in a circulating fluidized bed[J].Journal of Southeast University (Natural Science Edition),2002,32(5):95.[doi:10.3969/j.issn.1001-0505.2002.01.022]
[2]房德山,冷伟,徐治皋,等.循环流化床锅炉传热特性分析[J].东南大学学报(自然科学版),2001,31(6):52.[doi:10.3969/j.issn.1001-0505.2001.06.012]
 Fang Deshan,Leng Wei,Xu Zhigao,et al.Analysis of Heat Transfer Characteristics in Circulating Fluidized Bed Boiler[J].Journal of Southeast University (Natural Science Edition),2001,31(5):52.[doi:10.3969/j.issn.1001-0505.2001.06.012]
[3]陈秀华,杜宪华.利用动量变化测量气力输送煤粉的质量流量[J].东南大学学报(自然科学版),1990,20(2):86.[doi:10.3969/j.issn.1001-0505.1990.02.013]
 Measuring Massflow of Pneumatic Transport Powdered Coal by Means of the Momentum Change[J].Journal of Southeast University (Natural Science Edition),1990,20(5):86.[doi:10.3969/j.issn.1001-0505.1990.02.013]
[4]龚家彪.从两相管流的某些特性探讨两相管流的流量测量问题[J].东南大学学报(自然科学版),1964,6(2):85.[doi:10.3969/j.issn.1001-0505.1964.02.005]
 Kung Chia-Piao.Discussions on The Measurement of Two-Phase Fluid Flow in Pipes[J].Journal of Southeast University (Natural Science Edition),1964,6(5):85.[doi:10.3969/j.issn.1001-0505.1964.02.005]
[5]陶敏,金保升,仲兆平,等.循环流化床烟气脱硫多层喷水数学模型[J].东南大学学报(自然科学版),2010,40(1):144.[doi:10.3969/j.issn.1001-0505.2010.01.027]
 Tao Min,Jin Baosheng,Zhong Zhaoping,et al.Mathematical model for multi-level humidifying of the circulating fluidized bed-flue gas desulfurization system[J].Journal of Southeast University (Natural Science Edition),2010,40(5):144.[doi:10.3969/j.issn.1001-0505.2010.01.027]
[6]刘仁平,金保升,仲兆平,等.循环流化床燃烧棉秆两种床料的特性[J].东南大学学报(自然科学版),2007,37(3):441.[doi:10.3969/j.issn.1001-0505.2007.03.018]
 Liu Renping,Jin Baosheng,Zhong Zhaoping,et al.Study on two kinds of bed materials during CFB combustion of cotton stalk[J].Journal of Southeast University (Natural Science Edition),2007,37(5):441.[doi:10.3969/j.issn.1001-0505.2007.03.018]
[7]归柯庭,巢江辉,施明恒,等.气固磁流化床的双相模型[J].东南大学学报(自然科学版),1997,27(5):83.[doi:10.3969/j.issn.1001-0505.1997.05.015]
 Gui Keting,Chao Jianghui,Shi Mingheng,et al.A Two Phase Model of Gas Solid Magnetically Fluidized Bed[J].Journal of Southeast University (Natural Science Edition),1997,27(5):83.[doi:10.3969/j.issn.1001-0505.1997.05.015]
[8]杨瑞敏,徐桂中,丁建文,等.堆场疏浚泥颗粒分选规律及机理[J].东南大学学报(自然科学版),2013,43(3):639.[doi:10.3969/j.issn.1001-0505.2013.03.035]
 Yang Ruimin,Xu Guizhong,Ding Jianwen,et al.Grain sorting laws and mechanisms in reclaimed land of dredged slurries[J].Journal of Southeast University (Natural Science Edition),2013,43(5):639.[doi:10.3969/j.issn.1001-0505.2013.03.035]
[9]周建新,邵壮,李崇,等.基于Aspen平台的Oxy-CFB燃烧侧动态特性模拟[J].东南大学学报(自然科学版),2014,44(6):1187.[doi:10.3969/j.issn.1001-0505.2014.06.017]
 Zhou Jianxin,Shao Zhuang,Li Chong,et al.Dynamic characteristics of Oxy-CFB combustion system based on Aspen[J].Journal of Southeast University (Natural Science Edition),2014,44(5):1187.[doi:10.3969/j.issn.1001-0505.2014.06.017]
[10]李盼盼,陈振乾.正方形小通道内的冷凝换热数值模拟[J].东南大学学报(自然科学版),2016,46(4):763.[doi:10.3969/j.issn.1001-0505.2016.04.015]
 Li Panpan,Chen Zhenqian.Numerical simulation of condensation heat transfer inside single square minichannel[J].Journal of Southeast University (Natural Science Edition),2016,46(5):763.[doi:10.3969/j.issn.1001-0505.2016.04.015]

备注/Memo

备注/Memo:
基金项目: 国家自然科学基金资助项目(50176010,90410009).
作者简介: 向文国(1964—),男,硕士,副教授,wgxiang@seu.edu.cn.
更新日期/Last Update: 2005-09-20