Powder and Bulk Engineering
Tuesday, September 02, 2014
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Powder and Bulk Engineering is a technical publication devoted to readers in the bulk solids market, worldwide.
Technical Articles
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Publication Date: 11/2013
Pages: 3
PDF Format
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Using an air-assisted discharge hopper to eliminate powder flow problems

Learn about the difficult traits fine powders can exhibit, problems the powders can cause, vessel design factors that affect powder flow, and how using an air-assisted discharge hopper can improve flow.

Fine powders are often difficult to handle in hoppers, bins, and silos because of their high cohesiveness, high friction on many wall materials, and low gas permeability. Cohesiveness can cause flow stoppages when the attractive forces between particles cause a cohesive arch to develop over the vessel's discharge outlet. High wall friction can prevent powders from flowing along the wall and discharging easily. A powder's bulk density increases (reducing its gas permeability) in the straight-walled section, then decreases in the converging section when the powder is discharged.

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