One of the key features of the Marini Evo Dryer is the increased length of its dryer drum, allowing the plant to change the position of the RAP Introduction after the dryer flame and in turn providing plant operators with added versatility. As a result the aggregate heat exchange area stays constant, ensuring an efficient drying process.
In addition, to ensure the correct position of the flame inside the dryer drum a special long burner with internal protection is now available. This design means that the RAP introduction area is positioned after the flame, allowing a mixing area at the end of the cylinder, between the aggregates and the RAP. The design includes purpose-built mixing blades that reduce the stickiness of the RAP into the dryer drum.
The RAP can then be heated gradually, without being over-stressed by the high temperatures in the flame area. This allows the residual bitumen to be recuperated efficiently, without the risk of burning or drawbacks found with some conventional dryers such as high emissions and odour.
The Marini EvoDryer comes complete with another novel development, the new EvoDryer cylinder, which can be used to treat the fumes produced by the mixing tower in the discharge area of the mixer. A dedicated fan system sucks the diffused emissions produced by the mixer discharge. It also allows the management of the complete system and to convey emissions to the dryer discharge area behind the burner. A deflector inside the cylinder optimises the airflow emissions inside the drum, which are then flame-treated to burn off organic particles, reducing emissions and odours.