BHS-Filtration Inc. Candle Filter

The BHS Candle Filter provides for thin-cake pressure filtration, cake washing, drying, reslurry and automatic discharge as well as heel filtration in an enclosed, pressure vessel. Units are available from 0.17 m2 up to over 100m2 of filter area per vessel. Candle Filters are installed for clarification and recovery applications from liquids with low solids content with 5% to less than 1% solids and trace amounts. Technical Description The filter candles, consist of three components: single-piece dip pipe for filtrates and gas, perforated core with outer support tie rods and filter sock media. The filtrate pipe is the full length of the candle and ensures high liquid flow as well as maximum distribution of the gas during cake discharge. The perforated core can be a synthetic material, stainless steel or Hastelloy and is designed for the full pressure of the vessel. The outer support tie rods provide for an annular space between the media and the core for a low pressure drop operation and efficient gas expansion of the filter media sock for cake discharge. Finally, the filter media is a synthetic type with a clean removal efficiency to less than 0.5 microns. As the cake builds up, removal efficiencies improve to less than 1 um.