System for utilizing recycled asphalt pavement and methods thereof

摘要

A method for utilizing recycled asphalt is provided. In exemplary embodiments, the method may comprise: mixing input feed with at least one of an asphalt rejuvenator and virgin liquid asphalt in a pre-coater/mixer; allowing the at least one of the asphalt rejuvenator and the virgin liquid to soften residual asphalt in the input feed and encapsulate any fine particles; discharging the mixture into a spiral section; feeding the mixture into a rotary dryer comprising a counterflow zone and a temperature elevation zone; activating the drying process and directing a heated air stream into the rotary dryer through a rotating chamber; allowing a portion of the heated air to escape through the counterflow zone and into the temperature elevation zone; liberating surface moisture from the mixture along with a portion of the heated air via an outlet; processing the exhaust from the system; and discharging a finished mixture.

主权项

1. A method for utilizing recycled asphalt comprising:
mixing input feed with at least one of an asphalt rejuvenator and virgin liquid asphalt in a pre-coater/mixer to generate a mixture; allowing the at least one of the asphalt rejuvenator and the virgin liquid to soften residual asphalt in the input feed and encapsulate any fine particles; discharging the mixture into a spiral section; feeding the mixture into a rotary dryer comprising a counterflow zone and a temperature elevation zone; activating a drying process and directing a heated air stream into the rotary dryer through a rotating chamber; allowing a portion of the heated air to escape through the counterflow zone and into the elevation temperature elevation zone; liberating surface moisture from the mixture along with a portion of the heated air via an outlet; feeding the mixture through an air baffle into the temperature elevation zone of the dryer; introducing additional additives to the mixture via a material entry collar; allowing the heated air stream to encounter one or more air dams adapted to increase a dwell time and an interaction with the mixture as it is mixed with flights; introducing at least one additional rejuvenator, liquid asphalt, or additional fillers to the mixture via one or more injection lines; processing an exhaust from the from the system; and discharging a finished mixture; wherein a common induced draft fan is controlled by a variable frequency drive to allow a variation of exhaust volume; and wherein the exhaust from both the counterflow zone and the temperature elevation zone may be ducted to the common induced draft fan.