Dust Collection Performance of Expanded Metal

Abstract

Experiments in dust collection were performed using expanded metal (PAIRO Screen) for the collection plate for airborne dust of which mean velocity ranged from 1.0 m/sec to 2.5 m/ sec. For light calcium carbonate of about 5, um average particle size, the collection efficiency of 10 or more screens was above 80% and the fractional collection efficiency showed sharp separation characteristics with 50 % separation point of about 1 μm. For fly ash of about 9 μm average particle size, the collection efficiency of 20 screens varied from 90 % to 24 % with increase of air velocity from 1.0 m/sec to 2.5 m/sec. The variation in fractional collection efficiency was obscure. From the experimental results of two powders with different properties, it is apparent that the physical properties, i. e. adhesion, flowability, etc., have an important effect upon collection performance.
Expanded metal is a useful pre-duster when the air velocity and number of screens are selected appropriately for a given powder.