It was aimed to derive rigorous momentum and energy balance equations where the change of kinetic energy in both spatial and temporal domains of a fixed-bed adsorption column was newly taken into account. While the effect of kinetic energy on adsorption column dynamics is negligible in most cases, it can become more and more influential with an adsorption column experiencing a huge pressure drop or with the gas velocity changing abruptly with time and along the column. The rigorous momentum and energy balance equations derived in this study have been validated with two limiting cases: (1) an inert gas flow through a packed column with a very high pressure drop and (2) blowdown of an adiabatic empty column. The new energy balance including the kinetic energy effect paves a way for simulating with an improved accuracy a Rapid Pressure Swing Adsorption process that inherently involves a very high pressure drop along the column and requires very high pressure change rates for column blowdown and pressurisation.
Bibliographical noteFunding Information:
We would like to thank our colleagues at carbon capture group in the University of Edinburgh and Fei Chen (Air Products) for providing us with useful and insightful comments. Financial supports from KETEP (Grant No.: 2011-8510020030) and EPSRC (Grants No.: EP/F034520/1, EP/J018198/1, EP/J02077X/1 and EP/J020788/1) are greatly acknowledged.
© 2015, The Author(s).
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Surfaces and Interfaces