Wet Scrubbers 022002

WET SCRUBBERS

DRY FILTRATIONWET SCRUBBERS

CYCLONESWET ELECTROSTATIC

PRECIPITATORS

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MIKROPUL WET SCRUBBERS

MikroPul has been a pioneer world-wide in providing wet scrubbers tosolve air pollution control problemsfor over 30 years. We offer six diffe-rent designs to meet almost anyrequirement:

• Vaned scrubber with no moving parts

• Dynamic scrubber with integral fan• High efficiency venturi scrubber• Multi-venturi scrubber• Rotary scrubber• Packed towers for gas absorption

In addition, we can provide these inseveral configurations and a fullrange of sizes as well. Our scrubberscan be supplied in carbon steel,plastics/FRP, or exotic stainlesssteels.

With our experience and worldwideresources, MikroPul has the capabilityto engineer a wet scrubber systemthat efficiently meets your needs.

Industries Utilizing MikroPulScrubbers

Our scrubbers are found in a widevariety of industries around theworld, including:

• Aluminum • Mining• Automotive • Plastics• Chemicals • Potash• Coal • Pulp & Paper• Detergents • Rock products• Fertilizers • Waste water• Foundries • treatment • Incineration • Steel• Iron ore

Systems Capability

MikroPul can provide complete turnkey dust control system designincluding scrubbers, cyclones, fabricfilters, and other components. Ourcapabilities include:

• Process analysis• System design• Equipment supply• Installation• Start-up• Testing

MikroPul offers unmatched collectiveexperience, facilities, equipment, andexpertise - the best overall capabilitiesin the world of dust control and pro-duct recovery. Scrubbers on aluminium pot lines (Australia).

Selection Guide

Mikro-Vane

Dryers

Generaldedusting

Mining

Polypropylenedryers

0,5-1,5

0,3-0,6

Dynamic

Lime kilns

Lime shakers

Dissolvingtanks

Mining

Minerals

1,2-4

0,3-0,4

Venturi

Lime kilns

Dryers

Foundries

Shredders

Minerals

2,5-15

1-2

Multi Venturi

Wood firedboilers

Metallurgicalfumes

Mining

1,5-15

0,6-2

Rotary

Waste incineration

Pigments

Fertilizer

Absorption ofHF, H2S, NH3

Odor removal

0,8-1,5

1-2

Packed Tower

Waste incineration

Flotation cells

Calcining

Odor control

Reagent preparation

0,5-0,75

Applicationdependent

Typical pressure Drop Ranges [kPa]

Approximate Liquid Requirement [l/m3]

Sample Applications

Installations around the World

MikroPul offers substantial engineer-ing and manufacturing capabilities ona global scale. Examples include:

1. Venturi scrubber for automotiveplant foundry (Canada).

2. Venturi scrubbers for car shreddingplant (United Kingdom).

3. Dynamic scrubber for ore crushingplant (Australia).

4. Multi-venturi scrubber for Barkboiler (Canada).

5. Packed Tower for ammoniaabsorption (Germany).

6. Venturi scrubber on autoclave ventfor gold mining operation (USA).

7. Pressure-shock resistant venturiscrubber (Germany).

8. Venturi scrubber for mine production shaft dedusting (underconstruction, South Africa).

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MIKRO-VANE SCRUBBER

Operation

Scrubbing liquid is introduced intothe scrubber as a spray directed downover a circular “scrubbing vane”arrangement. As the liquid drainsthrough the vanes, it creates curtainsof scrubbing liquid. Dust laden gasenters the scrubber tangentially andcollides with the curtains initiatingparticle agglomeration. The coarserparticles produced are washed downto the slurry outlet.

A restriction disc located in thescrubbing vane assembly acceleratesthe spin velocity of the gas. Thisaction combined with the flood ofatomized liquid from the spray causesthe formation of fine liquid dropletswhich encapsulate the fine particula-tes, again enhancing agglomeration.

The cyclonic action of the saturatedgas stream as it spins upward forcesthe agglomerated particles to fall outof suspension. The coarser droplets

impinge on the mist eliminator vanesand the finer droplets are forced todrop out of suspension by gravitational

and centrifugal forces acting on thegas stream as it exits through the top.

DYNAMIC SCRUBBER

Clean gas

Mist eliminator vanes

Scrubbing vanes

Scrubbing liquid inlet

Dirty gas

Slurry

Operation

Dust laden gas enters the lower cham-ber of the scrubber tangentially,imparting a cyclonic action to the stre-am. Coarse particles are removed by acombination of centrifugal and gravi-tational forces.

The stream encounters slurry, createdin a later stage, coming down from theupper chamber and becomes partiallywetted, initiating agglomeration. Asthe stream spins through a series ofscrubber vanes, intermediate sizedparticles impinge on the wetted surfa-ces of the vanes. These particles arethen washed down.

The gas stream containing the remai-ning fine dust is drawn into an adja-cent chamber containing a fan.Atomized scrubbing liquid is sprayedinto the eye of the fan, further redu-cing droplet size. These dropletsencapsulate the fine dust particles,thus enhancing agglomeration.

The gas stream then flows into the upperchamber tangentially at high velocity.The wet agglomerated particles areforced by cyclonic action against the

chamber walls and drain down to theinternal discharge cone. The gas stream, free of liquid droplets, spinsout through an outlet atop the scrubber.

Clean gas

Wetted fanwheel

Scrubbing liquid inlet

Scrubbing vanes

Cyclonic separator

Dirty gas

Slurry

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VENTURI SCRUBBER

MULTI-VENTURI SCRUBBER

Operation

The design of the MikroPul VenturiScrubber consists of a “wetapproach” venturi followed by aliquid entrainment separator. Dustladen gases enter the venturi andinstantly make contact with thetangentially introduced scrubbingliquid swirling down the venturi’sconverging walls.

At the venturi throat, the gas andliquid streams collide and the liquidbreaks down into droplets which trapdust particles. This gas/liquid mixturepasses through a flooded elbow, andthen enters the entrainment separatorthrough a tangential inlet. Centrifugalaction removes the heavy wetted particles from the gas stream. As an alternate, when very large diameter separators are required, theliquid is separated by passing thestream through a chevron-type mist eliminator baffle.

The dust/liquid mixture is dischargedfrom the separator bottom drain and

the cleaned gas leaves through thetop of the separator.

Operation

The dirty gases are directed through aventuri-rod deck where atomizedscrub water is introduced concurrentlywith the gas stream. The scrub wateris sprayed through a series of lowpressure, large orifice nozzles, distributing it evenly across the deck.

The gas rapidly accelerates as it pass-es through the venturi-rods. Thisaction creates smaller droplets, causing encapsulation of the particlesand increasing the collection efficiencyof submicron particles.

As the gases exit the venturi-rod area,velocity slows causing the larger particulate laden droplets to fall out ofthe stream. The scrubbed gases arethen directed toward a two-stagedemisting zone by distribution bafflesor turning vanes. Primary demistingand gas distribution occurs in thepredemist area, which removes 90%of the water. The remaining free water

droplets are removed by impingementon the final stage demist vanes.

The scrub water collected prior to the

demist section flows down the scrubber floor to the drain trough. The dewatered scrubbed gases areexhausted via the scrubber outlet.

Clean gas

Cyclonicseparator

Scrubbingliquid inlet

Wet wallventuri

Venturi throat

Flooded elbow

Dirty gas

Slurry

Clean gas

Demist section

Pre-demist section

Gas outlet

Scrubbing liquid header

Dirty gas

SlurryMulti-venturirod deck

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ROTARY SCRUBBER

The dust laden gases enter the unittangentially. A significant portion ofdust is eliminated by intermixing thescrubbing liquid with the cyclonicgas flow.

The gas passes one or two washingsections. Drop dispersion takes placethere through a fast rotating atomizerwheel which is driven by an electricmotor with a belt, both located outsidethe scrubber housing. The washingliquid is centrically supplied to theguide vanes of the atomizer wheeland accelerated in guide channels to a thin liquid film. At the outside edgeof the wheel the liquid film disinte-grates into fine droplets, whose sizecan be influenced by the number ofrevolutions and the liquid quantity.Over the entire cross section of theflow a continous liquid curtain iscreated. Due to forces of inertia and diffusion, solids and gaseous pollutants in this vortex wash zoneare separated. Particle/droplet agglomerates are forced against the

chamber walls and washed down tothe sludge outlet. If higher separationefficiencies are necessary, a second

washing section is applied. The finalstage is a mist eliminator, after whichthe cleaned gas exits atop.

ABSORPTION TOWER

Clean air

Scrubbing section

Atomizer wheel

Belt drive

Raw gas

Slurry

Operation

Pollutant laden gases enter at the bottom of the packed tower and riseupward, making contact with thescrubbing liquid draining downthrough the packed column. Since thepollutant concentration decreases asthe gas rises, there is constantly fresher solvent available for contact,resulting in an efficient removal ofcontaminants. Finally, the finemoisture droplets, still suspended inthe cleaned gas stream, are removedby a mist eliminator.

Scrub liquid from the eliminator iscollected in an integral reservoir andrecycled to the tower. Makeup liquidis constantly introduced, and reagentis added on demand using a dosingpump controlled by a pH monitor.

Clean air

Mesh padcleaning waterheader

Reagentintrodction header

Packed bed

Mist eliminationmesh pad

Packing supportgrate

Contaminated gas

Integral reagent

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EFFICIENCY GUIDE

Scrubber Type and Pressure Drop in Pa (100 Pa = 1 mbar = 10 mm WG)

1. Mikro-Vane Scrubber LPS 10002. Mikro-Vane Scrubber LPS 1300 - 15003. Mikro-Vane Scrubber LPS 2000 - 2300

Mikro-Venturi Scrubber MVS 15004. Mikro-Vane Scrubber LPS 2800 - 30005. Rotary Scrubber one stage MRW 1800

with 1,0 Liter Washwater/m3 Gas6. Venturi Scrubber SVS 4000

Dynamic Scrubber DS 2 3500 - 4000Multi-Venturi Scrubber MVS 3500 - 4000

7. Rotary Scrubber one stage MRW 1850with 1,6 Liter Washwater/m3 Gas

8. Venturi Scrubber SVS 6500 - 76009. Venturi Scrubber SVS 10000

10. Wet-Pulsaire® Filter WET 4500

General Scrubber Fractional Efficiencies

America

MikroPul Headquarters4500 Chesapeake Dr.Charlotte, NC 28216USATel: ++1-704-998-2600Fax: [email protected]

MikroPul Pittsburgh2591 Wexford-Bayne Road, Suite 202Sewickley, PA 15143USATel: ++1-724-934-3910Fax: [email protected]

MikroPul Chatham17 Wachung AvenueChatham, NJ 07928USATel: ++1-973-635-1115Fax: [email protected]

MikroPul Canada, Inc.245 Matheson Blvd. E., Unit # 10Mississauga, Ontario L4Z 3C9CANADATel: 905-712-0722Fax: [email protected]

MikroPul, S de RL de CVAv. Lomas Verdes No. 480-302BCol. Lomas VerdesCP 53120 NaucalpanEdo. de MexicoTel: +52-5-343-8224Fax: [email protected]

Europe

MikroPul GmbH & Co. KGWelserstrasse 9-11D-51149 KölnGERMANYTel: +49-2203-9391-0Fax: [email protected]

Filter-Media Division of MikroPul France S.A.Parc Club du Moulin a Vent, Bat. 54/233 Av. Docteur Georges Levy, F- 69693 Venissieux CedexFRANCETel: ++33/478-789900Fax: ++33/478-019458e-mail: [email protected]

MikroPul LimitedChadwick HouseBirchwood ParkWarrington, Cheshire WA3 6AEUNITED KINGDOMTel: +44-01928-849220Fax: [email protected]

Asia/Pacific

MikroPul Australia Pty. Ltd.P.O. Box 62271 Toohey Road,Wetherill Park, NSW. 2164AUSTRALIATel.: +61-2-97562933Fax: +61-2-97561588E-mail: [email protected]

Africa

MikroPul (Pty.) Ltd.2nd Floor, Evapark Block „B“Cnr. DF Malan Dr. & Judges Ave.P.O. Box 4051Cresta 2118SOUTH AFRICATel.: +27-114780456Fax: +27-114780371E- mail: [email protected]

MikroPul Global Network

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A member of Beacon Industrial Group

www.mikropul.comwww.mikropul.de

MIKROPUL SUPPORTMikroPul backs up our products andsystems with worldwide customersupport. Call us any time you needhelp.

Parts

Because we know your equipment,MikroPul is your best resource forparts. We carry a full line of replace-ment parts, and keep high wear itemssuch as pumps, valves, fans, spraynozzles, packing, vanes, etc. in stockfor immediate shipment.

Services

MikroPul provides an array of servicesto help you select, install, operate,and maximize your equipment investment. We also have the uniquecapability to update your system tomeet today’s changing operating

conditions and performance require-ments. Services include:

• Complete systems evaluations• Mechanical equipment review and

evaluation• Equipment refurbishing• Equipment rebuilding• Technical training• Maintenance training

Whether you need spare parts, equipment service, or completesystem rebuilds, we are here to support your requirements.

Wet Scrubbers 022002

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