The Sharplex-NFM Pressure Candle Filter is a batch filter using vertical cylindrical tubes, or candles, positioned vertically on filtrate registers. As the cake forms thicker on the candles, the filtration area increases, offsetting reduced flow rates due to cake resistance. The filter cake is discharged either dry with back-pulse air pressure or sluiced with filtrate.
The candles can be dressed with membrane-quality filter media to provide absolute particle capture. In addition to stainless steel alloys, 2205 Duplex, Hastelloy C-276, titanium, alternate materials of construction are available for the elements such as polypropylene, PVDF, and special FRP.
Typical applications include chlor-alkali brine filtration, specialty chemical clarification, and pharmaceutical liquor polishing.