×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Elimination of Sulfuric Acid Mist

Elimination of Sulfuric Acid Mist

Elimination of Sulfuric Acid Mist

(OP)
I am in the process of designing a wet scrubber for the removal of sulfuric acid mist from exhaust air.

This mist is reported as having particle size of 5 - 6 micrometers and specific gravity slightly above 1, while the packing manufacturer has data only for 7 - 12 micron particles at that SPGR, and for SPGR 2 -4 at the particle size of interest.

Is there any equation to correlate removal efficiencies? Or rules of thumb to the same effect?

RE: Elimination of Sulfuric Acid Mist

H2SO4 mists are are amoung the hardest to mitigate.
I think you'll need fabric elements.
Hope you can stand the element pressure drop.

RE: Elimination of Sulfuric Acid Mist

(OP)
Yes, the scrubber will use a knit mesh mist eliminator above the liquid distributor.

RE: Elimination of Sulfuric Acid Mist

A wet scrubber (alone, with no demister)can do about 2-4 microns d50 cut.

H2SO4 mist / aerosols should be much finer than that, so It's pretty sure that if the 5-6 microns you report is correct, it is not H2SO4 mist.

As said H2SO4 aerosols call for , a good mesh pad, and more effectives options would be ceramic candles / fabric (but you need to reheat if downstream a wet scrubber)  or a wet electrostatic precipitator (WESP). A WESP is expensive, and ceramic filters mean pressure drop.

RE: Elimination of Sulfuric Acid Mist

(OP)
The mist is from battery formation lines, not sulfuric acid plant or the like. Particle size comes from the data I have been provided with.

I'm a bit rusty on the mist terminology: "d50 cut" means removal of 50% of the particles?

RE: Elimination of Sulfuric Acid Mist

d50 means that a particule of that size has 50% chances of beeing collected, and 50% chances of escaping.  So, yes 50% of the particules of the d50 size will be intercepted.

The particule distribution is a key element. If your mist is really 5-6 microns in size, a wet scrubber should get it by itself. A mesh pad too, and you will not need more sophisticated technolgies.
 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources