5 replies to this topic

[siretb]

Reinhard Billet PACKED TOWERS in processing and environmental engineering
VCH Verlagsgesellshaft
ISBN 3-527-28616-0 (1995)

THer are detailed examples at the end of the book, exactly what you want

[katchum]

But how to decide the flue gas velocity, the diameter and height of tower and the pressure drop?

thanks

I think pressure drop for absorption in packed bed requires 16 - 48 mmH2O/m packing. Then you choose a kind of packing with packing ratio. Flue gas velocity is mostly set in a company. Diameter is found through the Sherwood correlation requiring G and L flow also the kind of packing. If the packing ratio doesn't concur with your diameter, then you choose a smaller packing.

For the Height of the tower you look at the packing of a company and gather information about G/L ratio, kind of packing, absorption system and HTU. Then you can calculate your L flow from your gas flow. It's this L flow you need for the Sherwood Correlation. Then you calculate NTU: you need the slope of the equilibrium line of your system. With the Colburn equation you calculate NTU. (Or you could estimate everything with Henry...)

Height of tower = NTUxHTU

I'm just a student so...
If it isn't correct please notify me of my mistake, because I'm designing it this way and I hope it's the right method.