Pressure drop through an adsorber
Pressure drop through an adsorber
(OP)
We are designing a very simple process air dryer using a desiccant in a packed column. I need to estimate the pressure drop of the airflow though the column. Can anyone point me to the resources to help?





RE: Pressure drop through an adsorber
Minimum: DP/L = 0.01 PSI/FT
Delta P
------- = Aμ V + Bρ V2
L
Where Δ -P/L is pressure drop/bed depth, psi/ft
μ is fluid viscosity, centipoise
V is superficial fluid velocity, ft/min
ρ is fluid density, lbm/ft3
A & B are dimensional constants
A & B constants:
(for several Particle Mesh Ranges)
psi-min/centipoise-ft2 psi-min2/lbm
4 –8 mesh bead 0.0560 0.0000889
1/8" extrudate 0.0722 0.000124
8-12 mesh bead 0.152 0.000136
1/16" extrudate 0.238 0.000210
RE: Pressure drop through an adsorber
RE: Pressure drop through an adsorber
1. Does "V2" mean V*V?
2. What is the source of this relation?
Thanks again.
RE: Pressure drop through an adsorber
Should be as: V, and V^2, respectively.
The velocity is a single number for given vessel diameter.
RE: Pressure drop through an adsorber
Thanks again, but could you tell me where you got the equation?
RE: Pressure drop through an adsorber
My adsorption technical service training.
You can believe to these figures, they have been verified in the field, many times.
RE: Pressure drop through an adsorber
Depending on service (dew point requirements) you have to choose between Silica Gel, Activated Alumina, or Mol Sieve. If you are in warmer region, select Alumina charge and you'll get the best results. Mol Sieves have higher regeneration requirements but also have lower dew points - it all depends what you need.
Best regards,
RE: Pressure drop through an adsorber
RE: Pressure drop through an adsorber
RE: Pressure drop through an adsorber
RE: Pressure drop through an adsorber
or you can refer to GPSA - chapter 20 - dehydration.
If you know the supplier of dessicant that you are going to buy, suggest to get the curve of pressure drop/length vs gas flux across packed bed from them, it will be more accurate.
RE: Pressure drop through an adsorber
RE: Pressure drop through an adsorber
I think attached PP presentation might help you......
RE: Pressure drop through an adsorber
RE: Pressure drop through an adsorber
Page 17 in the presentation showed you a curve that i mean to you : pressure drop per lenght of bed vs superficial velocity.
Thanks, Laliyo.