Vadeb Indirect Drum Drying System
The Vadeb® Indirect Drum Drying system (IDD system) has the same drying principles as the direct drying system. With the IDD system, the heat exchange takes place indirectly. Up to 95% of the gas-flow is recycled to a two-step heat exchanger.
Other Details IDD System
- IDD sludge dryer in Madrid (click to enlarge)
The thermal energy supply for the heat exchanger can be any fuel type:
- Hot gas from heaters;
- Exhaust gas from gas-engines or turbines;
- Or other heat sources with a temperature range of 350-650º Celsius.
Depending on heat-exchanger performances, the drum inlet temperature has a maximum of 450º Celsius.
Example Indirect Drum Drying
- Indirect Drying for sludge (click to enlarge)
Stable Performance
The Indirect Drum Drying system is designed for a more stable performance at lower dry inlet temperature. Non-condensables and surplus air can be treated with after-burning conditions in the furnace.
- Thermal energy consumption: 3.8 MJoules/kg H2O
- Temperature drum inlet range: 200-450º Celsius
