Nozzle drying principle

The principles of fluidisation, discussed in Chapter 6, are applied in this type of dryer, shown typically in Figure 16.25. Heated air, or hot gas from a burner, is passed by way of a plenum chamber and a diffuser plate, fitted with suitable nozzles to prevent any back-flow of solids, into the fluidised bed of material, from which it passes to a dust separator. Wet material is fed continuously into the bed through a rotary valve, and this mixes immediately with the dry charge. Dry material overflows through a downcomer to an integral after-cooler. An alternative design of this type of dryer is one in which a thin bed is used. 

Flat products such as tiles, tissue, paper, textiles and wood veneer are often dried using nozzle arrays (Mujumdar, 2007). Figure 1.1 illustrates the basic principle of the drying process using a nozzle array. Ambient air of temperature is heated in... 

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