Pressure Filters

Tubular Backpulse Filter:

CESCO offers a tubular backpulse filter designed to accomplish submicron filtration without the use of precoats or filter aids.  This makes it possible for small amounts of product to be recovered from waste streams and returned to the process stream without contamination.  This unit is less expensive and easier to operate than other designs.

CESCO offers a premium, self-cleaning leaf filter designed for efficient filtration in the most severe applications.  Due to a superior, patented sluicing design, this unit maintains its fully rated capacity even when heavy, sticky or unusually tenacious cake is encountered.  Its efficient sluicing system assures thorough cleaning of every square inch of filter surface area each cycle. 

To summarize, this unit is a horizontal pressure leaf filter with vertical leaves on a center filtrate shaft. The shaft rotates during cleaning to more effectively clean the leaves using spray jets or stationary scraper blades in the dry cake discharge model.  The unit offers higher flux rates, better cleaning and easier cleaning than conventional fixed leaf filters.

Horizontal Pressure Leaf Filter:

This unit is often used in cases where the cake collected is the valuable product, but may also be used to filter out (and optionally wash and dry) waste solids.  This unit can be designed for processing cake heights up to 20" thick, and for most applications the cake height ranges from about 6-14".  The unit is typically sized based on solids volume per batch.

3.  Discharge Valve - Typically a plug-type valve on the side of the vessel wall at the filter plate level.  For cases where the operations call for reslurry the cake and discharging as a slurry for downstream processing, a slurry discharge valve can be located either on the side wall at the filter plate level, or in the filter base.

4.  Heated Jackets/Shaft -  The filter/filter-dryer can be designed with heated side walls, filter bases, top heads, dust collector housings, and shafts and blades for extremely efficient drying duties.  An optional microwave drying system may also be designed for use with this filter/dryer. 

2.  Agitator - Typically with two or three S-shaped blades that can be moved up and down and rotated in either direction, to allow for reslurrying the solid-liquid contents, for cake smoothing (to eliminate cracks for efficient displacement washing), and for mixing up the cake and turning it over to allow for efficient drying via vacuum or warm gas introduction into the vessel.

These units consist of:

1.  Vessel - A cylindrical, vertical pressure vessel with dished top head and welded or flanged flat base.  If the base is flanged, the base is secured to the shell either with traditional clamps or with an automatic bayonet open/close mechanism.  The base of the vessel has a single flat filter base with a filter cloth or screen.  

CESCO offers pressure nutsches that can be used to automatically filter, wash, reslurry, dry, and discharge the cake from the single filter plate (with an option for full cake heal recovery). 

Automatic Pressure Nutsche Filter/Filter-Dryer:  CESCO is proud to be an authorized representative of COMBER, and industry leader in pressure filration and vacuum drying technology:

CESCO offers several different pressure filter designs (e.g. horizontal and vertical plate units), and they are often utilized as polishing filters on slow filtering and/or dilute streams to provide optical clarity. 

Some designs can use precoat filter aid applied to the filter cloth (e.g. diatomaceous earth), which can be used to remove particulates down to about 0.4 micron in size  In this case, the filter aid becomes the media that actually is performing the filtration and the filter cloth acts as a support and drainage layer.  Other designs use just filter cloth or screens to perform the filtration, with some units having the ability to "backpulse" in order to continue the processing of fluids.

Self-Cleaning Designs