yslim1997:
I don’t know if you are a student or a practicing, graduate engineer. I started operating and eventually designing and building some of my own adsorption units when I was a young engineer, over 58 years ago. I will assume license to make some comments on your post as follows.
- Please refer to the attached, which are a few of the many papers I have on adsorption. You will find answers to what I believe are your specific questions in the edited and formatted copies that I have prepared of some engineering conferences I have been to in the past.
- Calculating the height of an adsorption bed is rather simple and I question why you need to make the calculation if you are not familiar or experienced in an adsorption Unit Operation. Your queries indicate that you are not familiar with adsorption.
- If I am correct, why are you attempting to calculate what is probably a required unit? As Bobby Strain has indicated, this is normally left to a recognized adsorption designer and fabricator company. 50MMScfd of compressed air is a relatively large unit and if you don’t have the experience, I would advise you to purchase the design rather than try to design it yourself. 8 bars (120 psig) is a relatively low pressure to employ in an adsorption unit. What, specifically, are you doing this for? Is this atmospheric air?
- I will not calculate the information needed to answer your questions. Our experienced Forum members will all probably state the same since we normally would charge for such service and no one would assume the responsibility for the results obtained when the design is applied using the free, estimated information.
- You don’t specify if you are using a TSA or PSA regeneration (Thermal or Pressure Swing Adsorption) system. Which one is it?
- You also don’t state how many towers you are using.
- You want to use Activated Alumina for removing water and Mol Sieves for removing CO2. Are these two adsorbents to be used in the same adsorber vessel, one bed on top of the other? Are you aware that these two types of adsorbents have very different temperature requirements during regeneration (in case you are using TSA)? You should supply a detailed sketch of the tower arrangements together with the flow arrangements for adsorption and regeneration in order for our members to know specifically what kind of adsorption system you are implementing. There are many variations of how an adsorption system can be designed and arranged - 2 tower, 3 tower, open, closed, etc., etc.
- The attachment paper that Breizh supplys is not applicable to adsorbents. It is meant for calcium chloride deliquescent tablets used in dehydrating natural gas. That is why I am attaching some applicable papers to this post.
- I get the impression that you are a student when I see your following statements:
"kg h20/ kg Activated Alumina 1.78E-02
Amount of Activated alumina req 1902637.51 Kg
kg CO2/ Kg Zeolite 13x 0.237654
Amount of Zeolite 13x req 20390.00344 Kg"
- Practicing engineers would never cite the amount of alumina needed to the hundreth decimal place. That is naiveté.
We can furnish you with our comments and recommendations if you supply your detailed calculations and drawings. With scarce basic data, all that can be offered is our general comments and ideas.
Recent Developments in the Application of Molecular Sieves - 1958.docx 994.85KB
37 downloads
Gas Dehydration by Adsorption - 1952.docx 309.08KB
36 downloads
Dehydration With Molecular Sieves - 2004.docx 1.61MB
45 downloads
Fundamentals of Adsorptive Dehydration 2004.docx 846.67KB
50 downloads