东北大学学报(自然科学版) ›› 2005, Vol. 26 ›› Issue (7): 663-666.DOI: -

• 论著 • 上一篇    下一篇

多孔介质中可逆化学反应和传质过程数值模拟

李明春;徐曾和;田彦文;翟玉春   

  1. 东北大学材料与冶金学院;东北大学材料与冶金学院;东北大学材料与冶金学院;东北大学材料与冶金学院 辽宁沈阳 110004
  • 收稿日期:2013-06-24 修回日期:2013-06-24 出版日期:2005-07-15 发布日期:2013-06-24
  • 通讯作者: Li, M.-C.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(50136020);;教育部重点资助项目(01056)

Numerical simulation of reversible chemical reaction and mass transfer process in porous media

Li, Ming-Chun (1); Xu, Zeng-He (1); Tian, Yan-Wen (1); Zhai, Yu-Chun (1)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
  • Received:2013-06-24 Revised:2013-06-24 Online:2005-07-15 Published:2013-06-24
  • Contact: Li, M.-C.
  • About author:-
  • Supported by:
    -

摘要: 考虑到流体同固体骨架间的化学反应对多孔介质内的传递过程有很大影响,在导出微元体的综合速率表达式基础上,建立了描述当流体同固体骨架间存在可逆化学反应时多孔介质内传递过程的数学模型,运用有效容积隐式方法对其进行数值求解·针对固定床中铁矿石的间接还原反应,分析了流速、颗粒半径、化学反应平衡常数、化学反应速率等主要参数以及Peclet数和Thiele数的相对大小对床层内气体浓度分布和固体转化率分布的影响规律·研究结果对反应器的设计和运行具有一定的参考作用·

关键词: 多孔介质, 传递过程, 可逆化学反应, 耦合, 微元体, 综合速率

Abstract: The chemical reactions between fluid and porous matrix affect greatly the mass transfer process in porous media. A convection-reaction-diffusion mathematical model is thus developed by deriving a comprehensive formula of the representative elementary volume (REV), to describe the mass transfer process in porous media when the fluid and porous matrix take reversible chemical reaction. A numerical solution to the model is available by way of the finite volume implicit method. Taking the indirect reduction of iron ore in static bed into account, the influences of such main parameters as flow rate, particle size, equilibrium constant in chemical reaction and reaction rate and the ratio of the Peclet number to the Thiele number on the distribution of gas concentration and of fractional solid conversion are all analyzed. The results are useful for the conceptual design and operation of reactor.

中图分类号: