5 replies to this topic

[JeffreySchiehle89]

Hi,

 

I am an engineer in fluid dynamics and i am currently working on a project which requires accurate knowledge in adsorption through packed columns. Though I'm very familiar with Pressure Swing Adsorption systems, I don't manage to find excerpts from scientific publications which explain how to "simply" design an adsorption column step by step (height and diameter regarding the molecular sieve and the outlet flowrate you want).

 

Indeed, every article I read consisted in  series of equations and isotherm graphs which are quite difficult to exploit.

 

I namely want to design a 2-bed PSA system producing 8L/min oxygen-rich medical fluid. The columns will be filled with a LiX molecular sieve (I know all the physical characteristics of the chosen zeolite, i.e density of the beads, their diameter...).

 

So, how do I find the diameter and the height of the columns with these characteristics ?

 

I will be so glad to receive any help !

[breizh]

Jeffrey ,

A few documents to support your query .

Bonne chance.

Breizh

Edited by breizh, 08 October 2013 - 06:25 PM.

[ankur2061]

Jeffrey,

 

The Ergun equation which correlates pressure drop in a packed column with the superficial velocity may be used to determine the diameter of the packed column. If you know the pressure drop per unit length or assume a value, the superficial velocity can be determined. Once you know the superficial velocity, the minimum bed diameter can be calcualted knowing the volumetric flow rate of the entering gas to the packed column.  The length of the packed bed column would be a function of the quantity  (mass) of the molecular sieve required in the saturation zone of the packed column, the selected bed diameter and the bulk density of the molecular sieve material.

 

You may start with these general guidelines and try to research the subject further to solve your problem.

 

Regards,

Ankur.

[tarmizi90]

Hi,

 

As for my 3rd Year Design Project, I was given a task to design a syngas production plant and towards the end of the process, we are going to use the pressure swing adsorption/vacuum swing adsorption to remove the carbon dioxide. The amount of carbon dioxide that is removed from the unit (per day) is 2352kg. I've designed the adsorption column. I'm not sure about the whole design, but does it makes sense to have 22m height and 3.1m diameter of the adsorption column? Is it possible for me to hear your opinion towards my design of the adsorption column? 

Edited by tarmizi90, 20 January 2014 - 04:55 PM.

[ankur2061]

tarmizi90,

 

Nobody can hazard an opinion based on the amount of details given by you (dia X height) of the adsorption column. 

 

The best I can suggest is to get your design reviewed on a preliminary basis before final submission, by your professor, who assigned the task to you in the first place. After all, he is the one who is going to judge the correctness of your design and award you grades for your design project.

 

Regards,

Ankur.

[Harry.sagar]

hii, 

 

i want to know the ba

sic of adsorption technology, so here i m inviting your valuable advice.