结果表明，DEM方法能很好地模拟鼓泡床内的流动特性。

The results show that the DEM method can better simulate the flow characteristics in the bubbling fluidized bed.

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本文采用GE -I系列可编程控制器（PLC）的计数器来模拟鼓形控制器，由于用软件来实现，因此编程、修改灵活方便，而且总步数和输出点数可以满足所有场合的需要。

GE-I Series PLC is used to simulate drum controller in this paper. Because of implement with software, it is easy to modify program, and its total steps, output points can be used in all conditions.

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目前，关于鼓泡塔内气液逆流操作的CFD模拟计算还很少。

At present, a few CFD simulations of countercurrent of liquid and gas in the bubble column are found.

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