MOTTCORP _ Application Briefs _ Fiber Filters Hot Gas

Metal fiber filters for hot gas applications in

the petrochemical industry

Description:

The legislation on particulate emission to the atmosphere is getting tighteryear by year. Typical emission levels for high efficiency cyclones are close to50 - 100 mg/Nm3. To meet the current and future limits, other technologiesof separation are required.

ElectroStatic Precipitators (ESP) fit the criteria.However, this technology is very complex andvery expensive.

Cleanable sintered metal fiber filters offer an economical solution. The development of metalfiber filter media such as Bekipor® contributed toan increased quality level through higher filterefficiency and a longer on-stream life. The standard available alloys areAISI316 and Inconel® 601 used for high temperatures (up to 360°C/650°Fand 560°C/1040°F respectively), but other alloys are available.

The fine filter pore size guarantees filter efficiencies of 99.99%, resulting in emission levels below 10mg/Nm3. Furthermore, this high-efficiency filterprotects the turbo expander from erosion, reduces maintenance require-ments of the expander and protects the waste heat boiler from fouling.

A highly porous structure, which is a characteristic of a sintered metal fibermedia, offers high permeability and low pressure drop, even at high filtrationvelocities. This results in a low capital expenditure and low running costs.

The Bekiflow® HG filter system can also be used on the vent gas from catalyst storage hoppers and separation of catalyst fines during conveyingoperations.

BEKIFLOW HG

Bekipor® and Bekiflow® are registered trademarks of N.V. Bekaert S.A.Inconel® is a registered trademark of Special Metals Corporation.

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For more information:Mott Corporation84 Spring LaneFarmington, CT 06032-3159

Tel: 860-747-6333 or 800-289-6688Fax: 860-747-6739E-mail: quest@mottcorp.com

www.mottcorp.comISO 9001 CERTIFIED

mott corporationTh ink o f the poss ib i l i t i e s ™

DustLoadedGas

CleanGas

Cake build-up

Filtration Cycle

Back pulse

Cleaning Cycle

DustCake

PressurizedCleaningGas

Surface filtration: On line cleaned through back pulse

Technical and financial comparison

Specific features and benefits• No clogging• No Delta P fluctuations• Long on-stream life• Straight-forward technology

Filtermedia

Purpose• To meet emission standards• To protect downstream equipment• Particle filtration during

conveying operations

Cyclones Bekiflow® ESP

Emission(mg/Nm3)

Relativecosts

1

10

100

FCC-CCR-DEHYDROGENATIONconfiguration

STEAM CRACKERconfiguration

Filter vessel

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