So-called Third Stage Separator (TSS) packages were orginally designed for protection of Power Recovery Units in FCC units. Today, a modern TSS is also capable of reducing the volume of catalyst fines in the flue gas to meet environmental regulations. For optimal efficiencies of the cyclonic TSS and for removal of catalyst fines from the underflow stream, a Fourth Stage Separator (FSS) is installed. FSS systems are typically designed to handle 3 up to 5 % of the total flue gas flow, taken off the bottom of the TSS system.
In the past often a cyclonic FSS was sufficient to separate the cat fines from the TSS underflow, today the more efficient blowback filter FSS units are selected to assist the TSS in reducing the total stack emission level to meet the stringent emission regulations.
When installing the proven Dahlman Fourth Stage Separator technology, particulate matter in the refinery stack can be reduced to << 40 mg/Nm3.
Are you considering this type of system, or involved with the design of FCCU technology. If so, contact me for more details.
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Pollard Industries, LLC
P.O. Box 80485
Baton Rouge, LA 70898-0485
Phone 225.926.6311 or toll free US
1-866-813-3507
Fax 225.926.1533
www.pollardindustries.com
Specializing in: Filter systems, Air/gas Drying, Cartrridge and Bag elements, Sintered
