How AeroPulsebaghouses

provide betterperformance

The differences between us and them.Managing airborne particulates with an AeroPulsepulse-jet baghouse has several important advantagesover other alternatives - whether your application is inasphalt, chemicals, pharmaceuticals, food products,incineration of hazardous materials, or any other partic-ulate-generating process.Advantages of AeroPulse baghouses include• increased reliability ,• less energy for cleaning• easier bag removal• longer bag life• lower operating costs.

How pulse-jet dust removal works.Pulse-jet dust removal is the key to the high efficiencyand low operating costs of AeroPulse baghouses. Bagsare supported on metal cages, and dust-laden gasenters from the outside, with clean gas exiting fromthe inside through the plenum. Dust is deposited onthe outside of the bags.

To clean the bag, a short burst or pulse of clean gasis injected into the top of the bag. The pulse consists ofabout 20-25% compressed air and 75-80% gas

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which has just been cleaned. The combination of com-pressed air and induced gas creates a wave, removingdust from the outside of the bags. Because the pulseinstantaneously reverses the flow of gas through thebag, fine particles trapped between fibers are alsoremoved, providing highly efficient cleaning. Dustthen falls into a collection hopper.

Smaller bags use less energyfor cleaning.Most baghouse manufacturers supply you with 6"diameter bags on 8" centers. Unlike other baghouses,AeroPulse baghouses are 4-1/2" diameter on 7" cen-ters or 7" x 8" centers. So AeroPulse baghouses featuresmaller bags, with more open space between bags.Smaller bags offer you these major advantages:

• With smaller bags, less compressed air is used toclean the bags. A 4-112" diameter bag has only abouthalf the volume, but about 75% of the surface area asthe same length 6" bag. Although more 4-112" diam-ter bags are required to get the same air-to-clothratio, compressed airrequirements are lessbecause the total volumeinside the smaller bags isabout 50% less than thevolume inside the largerbags. With smaller bags,only about half theamount of compressed airis required to create thesame pressure on theinside waIls of the bags.The result: about one-third less compressed airis required. Compressedair is expensive - so theresulting savings aresignificant.

• And the high ratio ofprocess air to compressedair for cleaning hasanother important benefit.In high temperatureapplications where acid ormoisture is present, there isless temperature drop. Thisleads to less moisture oracidformation dun"ng thepulse, which, in turn,greatlY increases bag ljfe.

A 4-1/2" diameter baghas only about half thevolume if a 6" diameterbag, and thereforerequires less compressedair to clean.

Greater open space results in lowerupward air velocity.For equivalent gas flow through a baghouse, the greateropen space between bags in an AeroPulse baghouseresults in lower upward gas velocity, so fewer dust parti-cles are re-entrained as they are descending from top tobottom of the baghouse. Better cleaning efficiency is theresult.

AeroPulse offers you flexibility in design to meet yourprecise requirements. When you select an AeroPulsebaghouse, you make an up-front decision whether to:1) Choose a design that handles the same airflow as

other baghouses, but at a lower pressure drop; or,2) Choose a design that employs less square feet of

cloth to achieve the same pressure drop as otherbaghouses.• The benefits of handling the same airflow at a

lower pressure drop:you need less horsepower tooperate the baghouse. Energy savings are signifi-cant, resulting in lower operating costs over theljfe if the bag house.

• The benefits of using less square feet of cloth toachieve the same pressure drop:you save moneyon the initial cost if the unit, and on bag replace-mentcosts.

The choice is yours!

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4-1/2" diameter bagson 7X 8" centers= 15.9" closed area= 56" total area= 40.1" open area(71.6% open area)

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6" diameter bags on8" centers= 28.26" closed area= 64" total area= 35.74" open area(55.84% open area)

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Unique full side air inlet furtherreduces upward air velocity.AeroPulse baghouses offer a unique full side air inletwith full side baffle and diffuser to distribute dust-ladengas as it enters the baghouse. Most competitive designsemploy hopper entry.

If you compare an equivalent amount of dust-ladengas entering each design, you'll fmd that the AeroPulseside entry feature produces lower upward air velocity. Inthis design, a baffle distributes the gas over the entireside of the baghouse, reducing upward air velocity, low-ering pressure drop, and thus saving energy.

Conventional hopper entryproduces higher upwardair velocity.

Side air entry results in lowerupward air velocity, soJewerdust particles are re-entrainedas they descendfrom top tobottom if the baghouse. Thepressure drop is also lower;reducing energy costs.

Lateral stability lengthens bag life.AeroPulse baghouses are designed to provide long life andreliable service. This is done through minimizingbag wear:• The design of the

AeroPulse venturiincorporates lugs -no more nuts or bolts to rust orseize. The lugs actuallylock under the tube sheet,providing high lateral stability,so bags don't move around inthe gas stream. In competitivedesigns that employ aspring-type snap-in collar, thereis no lateral stability in thedirty air side.

• Since AeroPulse baghouses featuremore open space between bags,the bags are less likely to rubagainst one another,minimizing wear.

• The method used for mounting AeroPulse bags to cagesassures a snug fit at the bottom of the cage - despite anyvariations in bag length. Without this snug fit, bags wear atthe bottom of the cage.

"Truetop bag removal" allowseasy maintenance.The AeroPulse bag assembly, consisting of bag, cage and ven-turi, is smaller in diameter than the 5" mounting hole in thetubesheet. A single quarter-turn of the exclusive "Twist-Lock"venturi is all that's necessary for removal. "True top bagremoval" eliminates the need for workers to enter the collectorto change bags, and eliminates space requirements for internalcatwalks.

The AeroPulse design prevents two troublesome problemsfrequently encountered when trying to remove snap-in bags.Because bags can shrink tightly around the cage, it is oftennecessary to cut a snap-in bag from its cage before the cagecan be removed. Or, a hole in a snap-in bag can cause the bagto fill with dust so that the bag becomes bigger than thetubesheet opening though which it must be removed.

In either case, the AeroPulse design allows the assemblyto be removed easily. If it is necessary to change a bag, theprocess is accomplished outside of the collector with asingle quarter turn of the "Twist-Lock," then the assembly issimply reinstalled.

Pre assembly lowers installed cost.Many of our units can be shipped with bags, cages, venturis,and blowpipes completely installed - saving you manyhours of installation labor. This is an option you maywant to consider.

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AeroPulse baghouses:the reliable, efficientchoice for performance.AeroPulse baghouses are available instationary, portable, and semiportableversions, and have these other importantfeatures that increase reliability and longevity:• All-welded construction• Transistorized solid-state timer• No internal moving parts• Insulated walls (optional)• Venturis are sealed to tubesheet with molded gaskets• Versatile design is custom-tailored to your application

Want to learn more?For details on better performance indust collection with an AeroPulsebaghouse, please call us toll-free at800-544-7393.

AEROPULSE, INC.1746 Winchester Road, Bensalem, PA 19020Tel: 800-544-7393 • 215-245-7554Fax: 215-245-7849E-mail: apsales@aeropulse.comwww.aeropulse.com