scrubber tower sizing
scrubber tower sizing
(OP)
Not having Perry's handbook, can anyone give me the basic equations to size a gas liquid absorption scrubber tower?
All gas properties are known and the constituent to be removed is H2S.
Thanking you in advance....
All gas properties are known and the constituent to be removed is H2S.
Thanking you in advance....





RE: scrubber tower sizing
RE: scrubber tower sizing
PeterAB,
Thanks for the reply, but had figured as much. But like to have an idea myself of the calculations if possible.
Quotes are coming as we speak...
RE: scrubber tower sizing
If all you want is an "idea" of the calculations, I can summarize that the height of the tower tends to be proportional to the logarithm of (inlet concentration/outlet concentration), while the cross-sectional area will be proportional to the quantity (volume per unit time) of the gas treated. Actual numbers will be specific to the packing used.
RE: scrubber tower sizing
That is usually the case with dilute gases and fast chemical reaction in the absorption?
My application is biogas, which is formed from the biological breakdown of wastewater sludge.
I'm under the impression that biogas isn't a dilute gas, having a composition of 60% CH4, 38% CO2 and ~2% H2S?
(35deg C, 1 atm)
RE: scrubber tower sizing
A little leg work will get you in the right ball park, also get you to the right range of L/G ratios.
RE: scrubber tower sizing
Maybe have someone request a Scrubber Tech Bulletin for you from Harrington: http://www.harringtonplastics.com/Catalog/catalog12pdf_files/Section14/14_3.pdf
P.S. Try shopping for reference books like Perry's on eBay, Half.com and addAll
http://www.addall.com/Used/
RE: scrubber tower sizing
You may want to check with amine manufacturers like Dow for products to preferentially absorb H2S over CO2.
Note also that CO2 absorption is a slower process than H2S absorption. Hence a scrubber that minimizes liquid-gas contact time, such as a spray scrubber, will also minimize chemical consumed by CO2.
RE: scrubber tower sizing
A scrubber manufacturer pointed out that fact about the CO2 to me already actually.
He suggested using a selective H2S scrubbing liquid with a tradename of Sulftrol.
I was going to go with liquid distribution via spray nozzles all along, now I have another good reason to!
Thanks to all with all your posts, you've all certainly helped a great deal.