Abstract
Gas pressurization of powder beds is important in some industrial chemical processes. This paper describes an experimental and modeling study of gas flow characteristics in the compressible powder bed during gas pressurization. Powder compression characteristics under gas pressurization and gas permeation characteristics in the powder are obtained. The average compression ratios of the coal powder bed are larger than that of the glass powder bed. The source of this gas-induced compression and the corresponding characteristics are analyzed. The pressure drop across the powder bed increases to a maximum and then decreases during pressurization. The mechanisms for the pressure drop evolution are discussed. Furthermore, a model considering both the porosity change and the effect of the particle shape is proposed to describe the gas flow in the compressible powder bed during pressurization. The model provides acceptable predictions for the pressure drop in the compressible powder bed.
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