Wet Scrubbers vs. Dry Dust Collectors

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WET SCRUBBERS, ARE “WET” DUST COLLECTORS, THE BEST TYPE OF EQUIPMENT FOR CAPTURE OF COMBUSTIBLE DUSTS GENERATED IN POWDER AND BULK PROCESSING OPERATIONS?

Transcript of Wet Scrubbers vs. Dry Dust Collectors

Page 1: Wet Scrubbers vs. Dry Dust Collectors

WET SCRUBBERS,A R E “ W E T ” D U S T C O L L E C T O R S ,

T H E B E S T T Y P E O F E Q U I P M E N T F O R C A P T U R E O F C O M B U S T I B L E

D U S T S G E N E R A T E D I N P O W D E R A N D B U L K

P R O C E S S I N G O P E R A T I O N S ?

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WET SCRUBBERS AND DRY MEDIA DUST COLLECTORS

ARE TWO VERY DIFFERENT TECHNOLOGIES USED TO CAPTURE

COMBUSTIBLE DUSTS.

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HIGH EFFICIENCY CARTRIDGE

MEDIA COLLECTORS

- MOST POPULAR FOR CAPTURING

INDUSTRIAL PROCESS DUST

- AVAILABLE WITH A WIDE CHOICE OF

FILTRATION MEDIA

- PERIODIC BURSTS OF COMPRESSED AIR

DISLODGE THE DUST FROM FILTERS

AND INTO A HOPPER

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WET SCRUBBERS

- FILTER DUST BY IMPINGEMENT

WITH WATER DROPLETS

- THE SMALLER THE DROPLET, THE MORE

EFFICIENT THE SCRUBBER

- WHEN COMBUSTIBLE DUST PARTICLES

ARE CAPTURED INTO THE SCRUBBING

LIQUID, THEY ARE NO LONGER IN

CONTACT WITH OXYGEN, AND THE

COMBUSTIBLE DUST HAZARD

IS CONTROLLED

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“iums”

ALUMINUM

HAFNIUM

MAGNESIUM

NIOBIUM

TANTALIUM

TITANIUM

ZIRCONIUM

As a general rule of thumb, wet scrubbers work best for light loading applications, such as grinding of large particles; very sticky dusts; dusts with high Kst values, typically of 150 Kst and above (Kst is defined as the rate of pressure rise and is a commonly recognized measure of a dust’s explosive power); and applications where dry collectors do not meet NFPA standards, especially involving metal dusts known as the “iums”

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Dry media collectors offer a number of

operational advantages over wet scrubbers.

Efficiencies are much lower on scrubbers when

dealing with 10 micron and smaller particles.

They require clean water, with a concentration

of dust particulate below five percent by volume,

which can become challenging in higher dust

loading applications. Wet systems also require

more maintenance and run at much higher

horsepower, especially when capturing particle

sizes of <2 micron. When hazardous dusts are

involved, disposing of wet materials may be

costlier than disposing of dry materials due

to regulations. Also, many metal dusts tend

to react with water to produce hydrogen gas,

requiring precautionary monitoring and control

of sump tanks.

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Sometimes the choice between a wet vs. dry

media system is not clear-cut. Dust testing is

the first step in the decision-making process

to determine a dust’s physical, combustible

and explosive properties. A hazard analysis

will also be needed to identify the full range of

combustible dust deflagration, fire and explosion

hazards specific to the application. Methods for

hazard analysis are spelled out in applicable

NFPA standards.

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VISIT OUR WEBSITE TO LEARN MORE!www.camfilapc.com

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content provided by:

JOHN DAUBERHANDTE PRODUCT MANAGER, AMERICASCAMFIL AIR POLLUTION CONTROL