气固错流移动颗粒床过滤器压降特性研究

研究了错流移动颗粒床过滤器操作压降与过滤介质特性、表现过滤气速、颗粒层移动速度和床层粉尘沉积量之间的关系。结果表明，无粉尘沉积时，床层压降可以用Ergun方程计算。颗粒层移动速度的变化并不会造成床层压降的显著变化。除尘过程中，床层内粉尘沉积量随气体中粉尘浓度的增大、颗粒层移动速度的减小而增加，同时将导致床层压降的显著增大。错流移动床除尘操作压降可以用带修正项的Ergun方程计算，其修正项为比沉积率和颗粒层空欧率的函数。在实验数据范围内，该方程的计算结果与实验数据最大偏差小于15％。

Pressure Drop of Cross-flow Moving Granular Bed for Dust Removal

The pressure drop of gas flowing through the cross-flow moving granular bed filter is of significance for the design and operation. The effects of filter media characteristics, filter media flow rate, superficial gas velocity and dust deposit on the pressure drop were investigated experimentally. When the gas is free from dust, the pressure drop can be described by Erguns equation. The filter media flow rate has little influenced on the pressure drop. However, when the gas is loaded with dust, the dust deposition can be enhanced with increasing dust content in gas or with decreasing filter media flow rate, which leads to the increase of the operating pressure drop. It was found that the pressure drop can be calculated by Erguns equation with a correction term that is a function of specific deposit and void fraction of bed. The maximum deviation between the calculated values and experimental data is less than 15%.