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通过建立二维数学模型模拟填充床中静滞粉尘含量,模型基于有限体积法的双流体模型,考虑气相、粉相、固相的相互作用,并将粉相分为静滞粉尘及动态粉尘,粉相的沉积机理采用过滤机制,主要由扩散作用、重力沉积、惯性作用等机制控制。通过与前人文献中实验结果对比验证了模型的正确性。模拟结果显示:随着气体速度的增加,填充床中静滞粉尘含量逐渐减小,气粉两相通过床层时压差高于纯净气体通过床层时压差;入口粉剂浓度也直接影响填充床中静滞粉尘含量。
The two-dimensional mathematical model was used to simulate the content of static dust in the packed bed. The model was based on the two-fluid model with finite volume method. The gas phase, the powder phase and the solid phase interaction were considered. The powder phase was divided into static dust and dynamic dust. The deposition mechanism of the powder phase adopts the filtration mechanism, which is mainly controlled by mechanisms such as diffusion, gravity deposition and inertia. The correctness of the model is verified by comparing with the experimental results in previous literature. The simulation results show that with the increase of gas velocity, the content of static dust in the packed bed decreases gradually and the pressure difference between the two phases of the powder passing through the bed is higher than that of the pure gas passing through the bed. The concentration of the inlet powder also directly affects the filling Bed of static dust content.