Drying on inert particles

Production of Powder-Like Material from Suspension by Drying on Inert Particles.363... 

Steady-state condition for drying can be achieved when the total operational time of the partial processes does not exceed the cycle time of the inert particles, that is the partial processes must take place during one circulation. It can be achieved by adequate coordination of the partial processes. In order to clarify the mechanism of drying on inert particles in the MSB dryer it is important to know the time required by each of the partial processes as well as the residence time of the inert particles in the various zones of the bed [23]. 

E.P. Szalay, and T. Szentmarjay, Production of powder-like material from suspension by drying on inert particles, in Handbook of Conveying and Handling of Particulate Solids, Vol. 10, A. Levy and H. Kalman (Eds.), Elsevier Science, Amsterdam, the Netherlands, 2001, pp. 581-586. 

E. Pallai, T. Szentmaijay, and E. Szijjarto, Effect of partial processes of drying on inert particles on product quality. Drying Technol., 19(8) 2033 (2001). 

Despite extensive studies on drying on inert particles, there is practically no data on the material residence time except those cited here for a swirling bed of inert particles. Also, the material residence time from 30 to 85 seconds has been specified for drying of animal blood and egg products dried as a film of 60 to 200 pm on a fluidized bed of 3- to 5-mm Teflon cubes (Table 4.2). Such a substantial residence time as compared to the residence time of a drying air was claimed to be sufficient to suppress undesirable microorganisms when combined with the material temperature in the range from 70° to 90°C (Rysin et al., 1981). 

Production of powder-iike material from suspension by drying on inert particles... 

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