CESCO offers Wet Electrostatic Precipitators (WESP's), which are recognized as the most reliable devices available for the removal of sub-micron sized solid particles and liquid droplets from the following types of process gas streams:

*  Wood Products

*  Power Boiler Exhaust with FGD Scrubber

*  Pulp & Paper

*  Sulfuric Acid Mist

*  Precious & Non-Ferrous Metal Recovery

*  Mist Elimination for Existing Scrubbers

*  Processes involving the treatment of saturated gas containing solid particles and liquid droplets

The vertical tube type design that CESCO offers provides the same high collection efficiency that a plate style unit offers, but with a velocity that is two times greater.  This results in a smaller cross sectional area for the same gas volume and a much smaller footprint than a horizontal unit.

Flow Diagram:

1.  The saturated process exhaust stream containing solid and/or liquid droplets is directed into the downflow WESP section. 2.  A fine mist of water or clean process fluid is introduced into the air stream. 3.   Upon entering the downflow stage, the soliud particles and liquid droplets are being charged by negative ions.   The negatively charged particles and droplets are attracted to positively charged tube walls. 4.  The gas and fluid mixture drains to the sump, below the upflow WESP section. 5.  The perforated plate above the sump provides gas distribution and mist elimination for large droplets.  The process of charging and collecting in the upflow is similar to the downflow, except the droplets of mist are sliding down the tubes into the sump for collection. 6.  Clean air exist the system, free of particles and mist droplets. 7.  The mixture of collected solids and liquids drain from the sump.

The two-stage flow design combines the advantages of:
 
1.  Downflow Mode:  This section operates in a continuous self-cleaning mode under heavy solid and sticky particle loading.

2.  Upflow Mode:  This section eliminates small droplets and has a high collection efficiency for condensible hydrocarbons.

The two-pass design also promotes the capture of volatile metals such as mercury.