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Spouted bed drying of agricultural grains
Author(s) -
Viswanathan K.,
Lyall M. S.,
Raychaudhuri B. C.
Publication year - 1986
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450640209
Subject(s) - inlet , draft tube , air velocity , water content , moisture , materials science , air temperature , pulp and paper industry , chemistry , environmental science , composite material , mechanics , geotechnical engineering , meteorology , geology , engineering , physics , mechanical engineering
Abstract It is shown that the presence of a “slotted draft tube” results in reduced air requirements for spouting and improved drying performance. Experimental data are presented on batch as well as continuous spouted bed drying of wheat, paddy, maize and peas. The variables studied are feed moisture content ( Q o ), inlet air temperature ( T o ), bed mass hold‐up ( M p ), inlet superficial air velocity ( u o ) and bed diameter ( D c ) in batch drying, and the above variables and solids feed rate ( F s ) in continuous drying. The data on average overall drying rate, ϕ m , in kg moisture evaporated per unit time per kg bed solids, is found to be correlatable as ϕ m , = k (50 Q o + 0.118 T o − 12.5) 10 −5 , and the single parameter k is presented for wheat, paddy, maize and peas for both batch and continuous modes of spouted bed drying. The correlation obtained should be useful in dryer design for the grains studied as well as for other similar materials.