TY - JOUR
T1 - Residence time distribution in spouted bed drying of maltodextrin solutions on a bed of inert particles
AU - Osorio-Revilla, Guillermo
AU - Gallardo-Velázquez, Tzayhri
AU - Ramírez-Torres, Arturo
AU - Rivera-Espinoza, Yadira
PY - 2012/2
Y1 - 2012/2
N2 - Residence time distributions (RTD) for aqueous maltodextrin solutions were determined in two kinds of spouted bed dryers: (1) conventional spouted bed (CSB) 0.305m diameter with a bed of polypropylene beads and (2) spout-fluid bed 0.143m diameter with draft tube submerged in a bed of FEP® pellets (S-FBDT). RTD, mean residence time t m, and spread of the distribution σ 2, were determined at different drying temperatures, spouting velocities, bed depths, spraying pressures, and feed concentrations. Average values of t m and σ 2 were 6.5min and 26.6min 2 for the CSB and 6.9min and 36min 2 for the S-FBDT, respectively, for all operating conditions except spraying pressure. RTD curves were well represented by the response of an ideal stirred tank with a superimposed bypass of 15% on average for the CSB and 7% on average for the S-FBDT dryer for all operating conditions. Increase in spraying pressure produced a reduction of t m and an increase in the bypass fraction of the product in both dryers.
AB - Residence time distributions (RTD) for aqueous maltodextrin solutions were determined in two kinds of spouted bed dryers: (1) conventional spouted bed (CSB) 0.305m diameter with a bed of polypropylene beads and (2) spout-fluid bed 0.143m diameter with draft tube submerged in a bed of FEP® pellets (S-FBDT). RTD, mean residence time t m, and spread of the distribution σ 2, were determined at different drying temperatures, spouting velocities, bed depths, spraying pressures, and feed concentrations. Average values of t m and σ 2 were 6.5min and 26.6min 2 for the CSB and 6.9min and 36min 2 for the S-FBDT, respectively, for all operating conditions except spraying pressure. RTD curves were well represented by the response of an ideal stirred tank with a superimposed bypass of 15% on average for the CSB and 7% on average for the S-FBDT dryer for all operating conditions. Increase in spraying pressure produced a reduction of t m and an increase in the bypass fraction of the product in both dryers.
KW - Inert solids
KW - Mean residence time
KW - RTD
KW - Spouted bed drying
KW - Suspensions and solutions
UR - http://www.scopus.com/inward/record.url?scp=84855246269&partnerID=8YFLogxK
U2 - 10.1002/cjce.20510
DO - 10.1002/cjce.20510
M3 - Artículo
SN - 0008-4034
VL - 90
SP - 153
EP - 162
JO - Canadian Journal of Chemical Engineering
JF - Canadian Journal of Chemical Engineering
IS - 1
ER -