Experimental study and numerical simulation on jet streaming in deep bubbling fluidized-bed

doi:10.3969/j.issn.0438-1157.2014.12.018

CIESC Journal ›› 2014, Vol. 65 ›› Issue (12): 4775-4784.DOI: 10.3969/j.issn.0438-1157.2014.12.018

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Experimental study and numerical simulation on jet streaming in deep bubbling fluidized-bed

YAN Shuren, LIANG Yongshi, ZHANG Yongmin

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

Received:2014-05-06 Revised:2014-07-29 Online:2014-12-05 Published:2014-12-05
Supported by:
supported by the National Natural Science Foundation of China (21276273), the National Basic Research Program of China (2012CB215004), the Program for New Century Excellent Talents in University Organized by the Ministry of Education of China (NCET-11-0733), the Program for Young Excellent Talents in Universities organized by the Beijing Government (YETP0675) and the China University of Petroleum (Beijing) Foundation (KYJJ2012-03-11).

深层鼓泡床内偏涌现象的实验研究与数值模拟

闫树仁, 梁咏诗, 张永民

中国石油大学(北京)重质油国家重点实验室, 北京 102249

通讯作者: 张永民
基金资助:
国家自然科学基金项目(21276273);国家重点基础研究发展计划项目(2012CB215004);新世纪优秀人才支持计划项目(NCET-11-0733);北京高等学校青年英才计划人才专项基金项目(YETP0675);中国石油大学(北京)基金项目(KYJJ2012-03-11).

Abstract

Abstract: By means of optical fiber probe, the jet streaming phenomenon in FCC baffle-free strippers was studied in a large cold-model experimental unit. Its properties as well as its development with bed height were studied. A newly developed computational particle fluid dynamics (CPFD) model was further used to explore this phenomenon. Jet streaming mainly happened near the stripper wall, resulting in serious non-uniformity in circumferential solids distribution. The strength of jet streaming decreased with increasing bed height. CPFD model could successfully predict the existence of jet streaming in this system. Although the predicted jet streaming strengths at higher bed heights were slightly overestimated, its trend with increasing bed height qualitatively agreed with the experimental fact. The deeper understanding acquired in this study can be used as a good reference for design and troubleshooting of the industrial FCC strippers.

Key words: jet streaming, fluidized-bed, catalyst, experiment, numerical simulation

摘要： 针对催化裂化空筒汽提器中存在的气体偏涌现象,在一套大型空筒催化剂汽提器冷模实验装置中利用光纤探针法系统研究了偏涌的特性及其随床层高度的发展变化情况,并进一步利用一种新的离散颗粒计算流体力学模型(CPFD模型)对该现象进行了数值模拟研究.结果表明,在催化裂化汽提器操作条件下,偏涌主要发生在临近床层边壁的位置,造成周向上颗粒浓度分布呈现严重的不均匀性,偏涌的强度会随着床层高度的增大而减弱.CPFD模型不仅能够成功预测深层鼓泡床中存在的偏涌现象,而且可以定性预测偏涌强度沿床层高度的发展趋势,但定量预测结果较实验结果偏大.上述结果对工业汽提器的设计和故障诊断具有指导意义.

关键词: 偏涌, 流化床, 催化剂, 实验, 数值模拟

CLC Number:

TF803.11

YAN Shuren, LIANG Yongshi, ZHANG Yongmin. Experimental study and numerical simulation on jet streaming in deep bubbling fluidized-bed[J]. CIESC Journal, 2014, 65(12): 4775-4784.

闫树仁, 梁咏诗, 张永民. 深层鼓泡床内偏涌现象的实验研究与数值模拟[J]. 化工学报, 2014, 65(12): 4775-4784.

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Experimental study and numerical simulation on jet streaming in deep bubbling fluidized-bed

深层鼓泡床内偏涌现象的实验研究与数值模拟

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