化工学报 ›› 2017, Vol. 68 ›› Issue (2): 630-636.DOI: 10.11949/j.issn.0438-1157.20160967

• 流体力学与传递现象 • 上一篇    下一篇

沸腾床内液相的返混特性

黄子宾1, 朱闯杰1, 黄岩1, 程振民1, 杨涛2, 刘建锟2, 方向晨2   

  1. 1. 化学工程联合国家重点实验室, 华东理工大学化工学院, 上海 200237;
    2. 中国石化抚顺石油化工研究院, 辽宁抚顺 113001
  • 收稿日期:2016-07-11 修回日期:2016-09-29 出版日期:2017-02-05 发布日期:2017-02-05
  • 通讯作者: 程振民
  • 基金资助:

    国家自然科学基金项目(21306045,21676085,21076072);中央高校基本科研业务费专项基金项目(222201314014)。

Backmixing characterization of liquid phase in ebullated bed reactor

HUANG Zibin1, ZHU Chuangjie1, HUANG Yan1, CHENG Zhenmin1, YANG Tao2, LIU Jiankun2, FANG Xiangchen2   

  1. 1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
    2. SINOPEC Fushun Research Institute of Petroleum and Petrochemicals, Fushun 113001, Liaoning, China
  • Received:2016-07-11 Revised:2016-09-29 Online:2017-02-05 Published:2017-02-05
  • Supported by:

    supported by the National Natural Science Foundation of China (21306045, 21676085, 21076072) and the Fundamental Research Funds for the Central Universities of China (222201314014).

摘要:

在直径0.3 m、总高7.2 m的沸腾床反应器内采用脉冲示踪法研究液相的返混特性。实验中分别以空气和水作为气相和液相,气体操作速度从0.26 cm·s-1变至12.97 cm·s-1,液体表观速度固定为0.86 cm·s-1。采用三氧化二铝颗粒作为固相,其中固体颗粒的平均粒径为0.4 mm,床层固体含量(体积分数)从0变至42.9%。实验结果表明,在所有考察条件下每组响应曲线均存在明显的长拖尾现象,沸腾床内存在剧烈的液体返混现象。尝试采用带回流的多釜串联模型拟合实验数据,结果表明模型预测值与实验数据吻合得非常好,其中拟合得到的全混釜个数N为8,回流比k从1.320至4.218不等,方差预测值与实验值之间的最大误差不超过+18%。

关键词: 沸腾床, 返混, 固含率, 停留时间分布, 带回流的多釜串联模型, 数值模拟, 实验验证

Abstract:

The liquid backmixing characteristics were investigated experimentally using pulse tracing technique in an ebullated bed reactor of 7.2 m in height and 0.3 m in diameter. Air and water were used as the gas and liquid phases, respectively. The superficial gas velocity ranged from 0.26 to 12.97 cm·s-1, while the liquid velocity was fixed at 0.86 cm·s-1. The particles of aluminum oxide with an average diameter of 0.4 mm were used as the solid phase. All experiments were carried out under the solids holdup from 0 to 42.9%(vol). The results showed that each response curve demonstrated obvious long tail phenomenon, which implied that there existed evident liquid backmixing in the ebullated bed reactor at different operating conditions. A tanks-in-series with backflow model was adopted to interpret the response data, which showed an excellent agreement between the prediction and experimental data. It also indicated that the number of stages N was 8, while the backmixing coefficient k varied between 1.320 and 4.218. Most of the variances of the predicted model were within +18% of their corresponding experimental values.

Key words: ebullated bed reactor, backmixing, solid holdup, residence time distribution, tanks-in-series with backflow model, numerical simulation, experimental validation

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