Scrubber Stack
Scrubber Stack
(OP)
I am new to permitting and I am trying to get a rough estimate of stack diameter and hieght for permitting before we have chosen a manufacturer for the scrubbers that we are going to use. We are going to use a packed bed scrubber. I have the flow rates calculated from the process engineer and I was wondering if there is a good calculation for figuring out diameter and height from flow rates from an ethanol process.





RE: Scrubber Stack
RE: Scrubber Stack
RE: Scrubber Stack
Once a stack diameter is estimated, dispersion modeling is normally performed to determine the height. Toxic, flammable, or odor limits should be considered. Once the height is known, recheck the pressure drop. Iterate until an acceptable solution is reached.
--Mike--
RE: Scrubber Stack
However, if all you want is a rough estimate of the diameter and assuming your process engineer has given you the volumetric flow rate up the stack (say in ft3/s), then assume that the linear velocity in the stack will be 75 ft/s and:
Area, ft2 = (V, ft3/s) ÷ (50, ft/s)
Then, since Area = (Pi)(D2 ÷ 4, you can calculate the diameter, D.
Milton Beychok
(Visit me at www.air-dispersion.com)
.
RE: Scrubber Stack
Then, since Area = (Pi)(D2) รท 4, you can calculate the diameter, D.
Milton Beychok
(Visit me at www.air-dispersion.com)
.
RE: Scrubber Stack
go to
http
luismarques
RE: Scrubber Stack
RE: Scrubber Stack
--Mike--
RE: Scrubber Stack
RE: Scrubber Stack
Natural draught at the bottom of the stack is created by the density difference between the ouside air and that of the flue gases multiplied by the height of the stack. One can then see that a high gas exit temperature and a tall chimney would help in creating the driving force to overcome internal resistances.