By Tadeusz Kudra
"Presents the newest breakthroughs in thermal dehydration, drying, and dewatering. Emphasizes rising apparatus, cutting edge recommendations, and low cost techniques for numerous commercial and agricultural functions. bargains category and choice standards for brand spanking new and complex drying systems."
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Extra resources for Advanced Drying Technologies
Spitzner and Freire (1998) have critically reviewed various models for drying in spouted beds of inert particles and made a qualitative comparison Drying on Inert Particles 41 between the three-region model and the thermodynamic model using literature data for drying of animal blood and aluminum hydroxide in a conical spouted bed. They have shown that the three-region model predicts an outlet air temperature and drying rate with deviations from experiments of less than 15% in contrast to the thermodynamic equilibrium model where a 50% difference was obtained between model estimates and experimental data.
3 MODELING AND SCALE-UP Despite numerous published papers on the subject of drying of suspensions on inert particles, there is insufficient data available in the open literature that can be used with confidence for process calculations and dryer design, with the possible exception of a vortex bed dryer with inert particles (Kutsakova and Bogatyriev, 1987). 1), which have distinctly different characteristics with respect to bed structure, particle and gas flow patterns, circulation velocities and distributions, re-coating ratio, surface renewal rate, etc.
Heating of liquid prior to spraying up to 70°C and heating the inert packing permit processing of heat-sensitive substances such as protein concentrates or saccharose solutions. Evaporation rates of up to 200 kg/h can be achieved at the inlet and outlet air temperatures in the range of 120° to 200°C and 40° to 50°C, respectively. , 1975). Here, a cylindrical drying chamber is fitted with a twin set of oppositely directed stubs for tangential entry of the secondary air. A streamlined insert located in the center of the chamber creates velocity distribution with a maximum at the impingement plane from the two counterrotating streams of secondary air.