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International’. In the Drum Drying system the product is directly heated. The
exhaust gas flows directly into the rotating drum.
Picture 32.: Grass drier facility
The maximum drum inlet temperature is 650 o Celsius. The total volume of the
dryer exhaust is treated by de-dusting equipment <strong>and</strong> if needed,
scrubber/condenser equipment. By recycling a part of the dryer (Figure 37.)
exhaust gas to the dryer, the amount of airborne gas to the stack is strongly
reduced.
Figure 37.: The DDD drying system
The facility has an Evaporation capacity of16.000 l/h, a grass input capacity of
20.000 kg/h at 20% DS <strong>and</strong> a grass output capacity of 4.500 kg/h at 90% DS.
Finally the facility has a need for thermal energy consumption of: 3,4 Mjoule/kg