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Flash dryers

Flash dryers are used for the rapid and gentle drying of fine-grained materials. The dried material is usually collected in a cyclone.
If required, the dryer can be combined with a hammer mill, which ensures production of the required product grain size.
The material is fed into the bottom of the dryer's shaft and is carried upwards in the hot drying gas, which can be produced in a combustion chamber or can be exhaust gas from another thermal process. The special design of the flash dryer ensures that the material is thoroughly dispersed in the hot gas. The dried material is subsequently collected in a cyclone.

The material is fed into the bottom of the dryer's shaft and is carried upwards in the hot drying gas, which can be produced in a combustion chamber or can be exhaust gas from another thermal process. The special design of the flash dryer ensures that the material is thoroughly dispersed in the hot gas. The dried material is subsequently collected in a cyclone.

 

Thanks to its excellent dispersion in the hot gas and the good flow conditions, the material is rapidly dried, so that a retention time of just a few seconds is often sufficient for drying out even very moist materials. This is a very important point, for instance in the case of temperature-sensitive materials. Any agglomerations in the material disintegrate as soon as they pass the inlet due to thermal shock when the surface water on the material spontaneously and violently vaporises.

 

Unlike the rotary dryer, the flash dryer has a very small footprint. Furthermore, the unit has only a few rotating parts, so that its maintenance requirement is low. In addition, due to the short material retention time, it is a very flexible drying system that can react quickly and simply to fluctuating feed material properties, such as feed moisture content. The flash dryer is therefore well suited for use in a larger process as a plant component that can equalise fluctuations in the raw material properties.