Vortex bed dryer

The same conclusion holds for other literature data as well. For example. Figure 4.4 presents the relationship between the equilibrium material (bed) temperature and inlet and outlet air temperature for drying of egg melange in a vortex bed dryer with forced pulsation of inert particles (Kutsakova and Utkin, 1989). Clearly, the material temperature is higher than the respective wet bulb temperature. At the same time, the material temperature is lower than the outlet air temperature, and this difference tends to be larger at lower inlet air temperatures. These data are consistent with measurements by Mar-... 

The importance of the residence time was observed by Mitev in the course of vortex bed dehydration of plaster of paris. At a bed temperature of 128-136°C, a residence time of 130 min was required to remove 1.5 molecules of water of crystallization. The average residence time of 30 min even at an inlet gas temperature of 800°C was not sufficient to attain the final desired moisture level. The cross section of the vortex bed dryer was 3.9 m, with an output of 6000 kg/h and a specific evaporating capacity of 1500 kg/m h. The inlet temperature of the 2000 m /h drying medium was 650°C the outlet temperature was 150°C. 

Figure 4.1 Basic configurations of dryers with inert carriers a) fluid bed b) spout-fluid bed c) fluid bed with inner conveyor screw d) spouted (jet-spouted) bed e) vortex bed f) swirling streams g) vibrofluidized bed h) rotary dryer i) pneumatic dryer j) impinging stream dryer.

Cyclone dryers Flash dryers Two-stage flash dryers Two-stage flash dryers Fast spouted bed Vortex dryers Batch dryers Fluid bed Vibrated fluid bed Batch dryers Vibrated fluid bed... 

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