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Engineering
Materials and Chemical Engineering
Modelling of two phase flow in packed bed (continued)
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[QUOTE="casualguitar, post: 6609110, member: 695787"] The CO2 would be in the range of 10-20% of the mixture by volume for example. No specified percentage yet however it would be a CO2 enriched stream i.e. much greater than 400ppm. I don't know actually, but I think you will be right about the CO2 depositing temporarily on the bed. What I thought would happen (assuming a bed colder than the freezing point of CO2) was that the ambient CO2 enriched stream would enter the cold bed and immediately the CO2 at the 'front' of the stream would freeze. The pure air would carry on through the bed. Then the newly entering stream - which is at ambient temperature - would vaporise the frozen CO2, and the vaporised CO2 plus the CO2 'behind' it in the stream would now be frozen/deposited slightly further downstream. This process repeats until you have a 'plug' of CO2 at the outlet of the bed. In regards to the time though as you say, I don't know if the CO2 will be immediately vaporised, or if this freezing/boiling process will take time. If it takes longer than instantaneous times then I would guess you would see a distribution of frozen CO2 along the bed, with the most CO2 being deposited furthest down the bed, and gradually less and less CO2 being deposited towards the inlet. Sort of like the left side of a normal distribution curve (or similar). The idea would be to freeze as much CO2 as possible in the bed in a 'plug' form. Then just sweep the bed with pure ambient temperature CO2 gas, leaving you with 'pure' air (within reason) and pure CO2 streams. Do you agree on this much? Papers I've read that describe the above (just two, not too many out there) - Tuinier, M.J., van Sint Annaland, M., Kramer, G.J. and Kuipers, J.A.M., 2010. Cryogenic CO2 capture using dynamically operated packed beds. [I]Chemical Engineering Science[/I], [I]65[/I](1), pp.114-119. Ali, A., Maqsood, K., Syahera, N., Shariff, A.B. and Ganguly, S., 2014. Energy minimization in cryogenic packed beds during purification of natural gas with high CO2 content. [I]Chemical Engineering & Technology[/I], [I]37[/I](10), pp.1675-1685. [/QUOTE]
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Modelling of two phase flow in packed bed (continued)
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