TY - JOUR
T1 - Thermal and flow effects during adsorption in conventional, diluted and annular packed beds
AU - Kwapinski, Witold
AU - Salem, Karijm
AU - Mewes, Dieter
AU - Tsotsas, Evangelos
PY - 2010/7/15
Y1 - 2010/7/15
N2 - Previous investigations have shown a complex combination of thermal and flow effects during adsorption in highly loaded, narrow packed beds. Respective conditions were realized by packing relatively large zeolite particles in a narrow tube (which causes wall channelling) and adsorbing water vapour from air on the particles (which is highly exothermic). The present work extends the investigation to novel column configurations with purposely altered conditions of heat generation and flow-namely to diluted beds, annular beds and beds consisting of coated particles. Experimental results obtained by near infrared tomography are compared with the results of breakthrough experiments in conventional columns and with numerical calculations. The latter are conducted with a non-isothermal, two-dimensional model that not only considers the increase of porosity and flow velocity near the tube wall, but also expresses the effective transport coefficients as functions of the radial coordinate. The model provides reasonable accuracy under conditions for which the usual plug-flow assumption is questionable.
AB - Previous investigations have shown a complex combination of thermal and flow effects during adsorption in highly loaded, narrow packed beds. Respective conditions were realized by packing relatively large zeolite particles in a narrow tube (which causes wall channelling) and adsorbing water vapour from air on the particles (which is highly exothermic). The present work extends the investigation to novel column configurations with purposely altered conditions of heat generation and flow-namely to diluted beds, annular beds and beds consisting of coated particles. Experimental results obtained by near infrared tomography are compared with the results of breakthrough experiments in conventional columns and with numerical calculations. The latter are conducted with a non-isothermal, two-dimensional model that not only considers the increase of porosity and flow velocity near the tube wall, but also expresses the effective transport coefficients as functions of the radial coordinate. The model provides reasonable accuracy under conditions for which the usual plug-flow assumption is questionable.
KW - Adsorption
KW - Near infrared tomography
KW - Non-isothermal model
KW - Packed bed
KW - Thermal effect
KW - Wall effect
UR - http://www.scopus.com/inward/record.url?scp=77953326316&partnerID=8YFLogxK
U2 - 10.1016/j.ces.2010.04.017
DO - 10.1016/j.ces.2010.04.017
M3 - Article
AN - SCOPUS:77953326316
SN - 0009-2509
VL - 65
SP - 4250
EP - 4260
JO - Chemical Engineering Science
JF - Chemical Engineering Science
IS - 14
ER -