固定床反应器中错流流动的数值模拟Numerical Simulation of Cross Flow in Fixed Bed Reactor
刘永兵,陈纪忠,阳永荣
摘要(Abstract)：
为了了解内置有传热管列而被强化的固定床床层内的错流流动,在考虑对流项和扩散项对流场的作用情况下,基于Ergun方程建立了该种固定床反应器多孔介质的数学模型,模拟了床层的压力分布,然后在管子按不同的三角形和正方形排列方式情况下,研究了床层内气体在多圆管管间及周边的速度分布。由于管道的阻挡,沿主体流动方向的速度分量v在圆管正前、后方近壁处,v显著下降,随着离开圆管距离的增大,其影响减弱,影响范围≤1.0Dt;气体在圆管前后流速下降,管间流速呈现增大的波形曲线,其波峰和波幅的大小以及波形曲线的形状,不仅与管间距离和入口速度有关,而且与圆管的排列方式有关。计算结果与实验值比较表明模型能正确描述床层的压力分布;采用三角形排列方式,与采用正方形排列方式相比,强化了床层内的对流传热,使得床层内温度分布更趋于均匀。
关键词(KeyWords)： 固定床反应器;错流流动;Ergun方程;排列方式
基金项目(Foundation):
作者(Author): 刘永兵,陈纪忠,阳永荣
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