基于DEM模拟气固循环流化床提升管内颗粒聚团特性

doi:10.11949/j.issn.0438-1157.20160440

化工学报 ›› 2016, Vol. 67 ›› Issue (8): 3321-3330.DOI: 10.11949/j.issn.0438-1157.20160440

基于DEM模拟气固循环流化床提升管内颗粒聚团特性

吴迎亚, 彭丽, 和宁宁, 高金森, 蓝兴英

中国石油大学(北京)重质油国家重点实验室, 北京 102249

收稿日期:2016-04-07 修回日期:2016-06-08 出版日期:2016-08-05 发布日期:2016-08-05
通讯作者: 蓝兴英
基金资助:
国家重点基础研究发展计划项目（2012CB215003）；国家自然科学基金项目（91334104）。

DEM simulation of particle clustering characteristics in gas-solid CFB risers

WU Yingya, PENG Li, HE Ningning, GAO Jinsen, LAN Xingying

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

Received:2016-04-07 Revised:2016-06-08 Online:2016-08-05 Published:2016-08-05
Supported by:
supported by the National Basic Research Program of China(2012CB215003) and the National Natural Science Foundation of China (91334104).

摘要/Abstract

摘要：

采用CFD-DEM的方法对气固循环流化床提升管内的气固流动特性进行模拟，建立了基于图像处理的分析颗粒聚团的方法，重点研究了颗粒聚团在床层内的整体分布以及颗粒聚团的特性，包括颗粒聚团的倾角、球形度以及长短轴比的概率密度分布以及它们在床层内的轴向和径向上的分布特性。研究结果表明，聚团在床层内的分布较宽，较小的聚团居多，边壁区域附近易形成较大的聚团。聚团的数目沿床层高度方向先增加后减少。聚团倾向于以偏离球形聚团、较大的倾角形式存在，其长短轴比值在2～4之间。

关键词: 流化床, 多相流, 计算流体力学, DEM, 颗粒聚团

Abstract:

Gas-solid flow in CFB riser was simulated by a combined approach of computational fluid dynamics (CFD) and discrete element method (DEM). A new cluster analysis method based on image calibration and processing technique was developed to obtain overall, axial and radial distributions of clusters in fluidized beds as well as cluster characteristics in terms of inclination angle, degree of sphericity, and aspect ratio of long over short axis. The clusters showed a wide distribution with mainly small clusters and large clusters formed in the regions near the wall. Along the height direction of the riser, the amount of clusters first increased and then gradually decreased. In addition, clusters were most likely to exist in the form of non-spherical aggregates with large inclination angle and aspect ratio between 2 and 4.

Key words: fluidized-bed, multiphase flow, computational fluid dynamics, DEM, cluster

中图分类号:

TQ021.1

吴迎亚, 彭丽, 和宁宁, 高金森, 蓝兴英. 基于DEM模拟气固循环流化床提升管内颗粒聚团特性[J]. 化工学报, 2016, 67(8): 3321-3330.

WU Yingya, PENG Li, HE Ningning, GAO Jinsen, LAN Xingying. DEM simulation of particle clustering characteristics in gas-solid CFB risers[J]. CIESC Journal, 2016, 67(8): 3321-3330.

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基于DEM模拟气固循环流化床提升管内颗粒聚团特性

DEM simulation of particle clustering characteristics in gas-solid CFB risers

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