<< Self-Cleaning Pulse Filter
Cleaning Action >>
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Self-cleaning cartridges are cylindrical elements with pleated media. The media pack is a blend of cellulose and synthetic material designed to be resistant to moisture. The media pack is supported, inside and out, by galvanized expanded metal, and pleat separation is maintained by beads of hot-melt glue that join the media pleats to the outer expanded metal. Cartridge ends are sealed with potted, galvanized end caps and each element has its own skinned neoprene gasket to seal to the filter house module.
One of the most important features of these media is that they are intended to be "surface loading". That is, particulate does not penetrate deeply into the medium and the resulting
"dust cake" can be dislodged by pulsing action. Although a cellulose medium is good for surface loading, it does not perform well in high humidity. As it becomes moistened, it
"swells" and the interstices close, increasing the elementís pressure drop. Thus, we add some synthetic material to the medium to improve performance in rainy, humid climates.
When the pressure drop through the media reaches a set threshold, the pulsing action automatically starts. As pulsing dislodges the dust cake, the pressure drop decreases and pulsing stops. Over time, very small particles, which cannot be removed by pulsing, will penetrate the medium and gradually increase pressure drop. When the pressure drop
"floor" rises to the point that pulsing cannot lessen the pressure drop, the element must be replaced. |
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