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Packed Scrubber Design Problem

biogas scrubber

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#1 saqlain

saqlain

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Posted 10 November 2013 - 08:50 AM

Dear sir,

 

I am saqlain final year student of chemical engineering.

 

I am working on a project “Process Design for Biogas Purification”. i am designing a packed absorber for the removal of co2. The literature I am referring www.epa.gov/ttn/catc/dir1/cs5-2ch1.pdf.

I have two problems

First I have no equilibrium data for co2-weter system at 10 atm for the development of equilibrium curve.   So I calculate the water flow rate required for the desired separation.

Second the literature assumes low concentration of co2 in gas. In the case of biogas there is concentrated feed. What changes in design procedure are required?

 

Data for design problem:

Biogas rate: 13000 kg/hr

Operating Pressure: 10 atm

Inlet co2 concentration: 40% by volume

Removal efficiency required : 95% (Outlet Conc: 1-0.95 x 0.4=  0.02) =2%



#2 Art Montemayor

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Posted 10 November 2013 - 08:20 PM

Saqlain:

 

You fail to give our Forum members ALL of the basic data involving your problem.

 

Are you required to use only the information contained in the EPA reference paper given?  This is important to know; otherwise, this thread will become a very long one with more questions and guesses from many members.

 

CO2 is a simple gas to remove from a mixture of gases – especially at elevated pressures.  Water can be used to selectively absorb CO2 (and it has been used many times in the past) – but at pressures above 10 atmG.  Today, Carbonate and amine solutions are employed industrially at high and low pressures.  At your concentration and rate, I believe a potassium carbonate or even a sodium carbonate solution would be effective for the removal.  But that depends on what constraints you have been given by your instructor(s).  Give us more background information on your assignment.  We will not work out your problem, but we can consult you on questions you raise or present regarding how to best organize and resolve your problem.

 

You fail to tell us the process gas composition and its temperature.  Are there any constraints or limits on removing the CO2?



#3 breizh

breizh

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Posted 10 November 2013 - 10:44 PM

http://www.idosi.org...wasj5(s)/18.pdf

 

Consider reading this paper . You should also try google "Biogas purification " a lot of documents are available.

 

Breizh


Edited by breizh, 10 November 2013 - 11:03 PM.





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