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过程工程学报 ›› 2016, Vol. 16 ›› Issue (4): 556-564.DOI: 10.12034/j.issn.1009-606X.215430

• 流动与传递 • 上一篇    下一篇

提升管进料射流对气固两相流动混合的影响

陈昇1,闫子涵1,王维3, 范怡平2, 卢春喜4   

  1. 1. 中国石油大学(北京)化工学院
    2. 中国石油大学(北京)化学工程学院
    3. 中国科学院过程工程研究所
    4. 中国石油大学(北京)重质油国家重点实验室
  • 收稿日期:2015-12-23 修回日期:2016-02-25 出版日期:2016-08-20 发布日期:2016-10-10
  • 通讯作者: 陈昇
  • 基金资助:
    国家重点基础研究发展规划(973)基金

Effect of Feed Sprays on Gas?Solid Two-phase Flow and Mixing in a Riser

CHEN Sheng 1,YAN Zi-han 1, WANG Wei 3, FAN Yi-ping 2, LU Chun-xi 4   

  1. 1. China University of Petroleum(Beijing)
    2. State Key Laboratory of Heavy Oil, China University of Petroleum
    3. Institute of Process Engineering, Chinese Academy of Sciences
    4. State Key Laboratory of Heavy Oil, China University of Petroleum (Beijing)
  • Received:2015-12-23 Revised:2016-02-25 Online:2016-08-20 Published:2016-10-10
  • Contact: CHEN Sheng

摘要: 为改善提升管进料区气固两相不均匀混合状况,针对一套大型冷模实验装置的提升管,结合实验和三维数值模拟,研究了提升管进料区催化剂和进料相不均匀混合的形成机理,考察了操作参数的影响,基于不均匀混合形成机理提出了一种新进料方式. 结果表明,传统斜向上进料方式导致进料区催化剂和进料相不均匀混合,合适的操作参数[颗粒循环速率Gs?80 kg/(m2?s),表观气速Ug?3.28 m/s,进料速度Ujet?62.5 m/s]可改善不均匀分布,将不均匀混合高度范围缩短约一半,但不均匀混合仍存在;新进料方式可实现快速均匀混合,尤其是向下30o进料方式.

关键词: 流化催化裂化, 提升管, 进料区, 能量最小多尺度, 流动, 混合

Abstract: In order to improve the uneven mixing of catalyst particles and feed in a feedstock injection zone of FCC Riser, the formation mechanism of the nonuniform mixing is studied through both experiment and 3-D CFD simulation over a large-scale cold-model riser. The effects of operating conditions on the mixing behavior are further investigated. Based on the formation mechanism, a novel scheme of feedstock injection is proposed and compared with the traditional scheme. The result indicates that the traditional scheme of feedstock injection leads to the uneven mixing. A desirable operating condition [Gs?80 kg/(m2?s), Ug?3.28 m/s, Ujet?62.5 m/s] can improve the distributions of solids and feed, reduce the axial range of catalyst-feed mixing by half, but the uneven mixing persist. The novel design especially the 30o downward scheme can be expected to realize a desired mixing.

Key words: fluidized catalytic cracking, riser, feedstock injection zone, energy-minimization multi-scale, flow, mixing