Abstract:
The invention relates to a device for manufacturing coated materials, the device comprising: a furnace comprising an enclosure (2) that is designed to be caused to rotate, that has an inside wall (2A) and that is provided with a main inlet (3) designed to receive non-coated new granular materials (25) or recycled granular materials (25) or a mixture of both of these types of granular materials, and an outlet for the bituminous coated materials that are manufactured inside the enclosure (2); heater means defining a combustion zone (4) inside the enclosure (2) and generating a drying flow suitable for drying the granular materials (25); and protective means for protecting the inside wall (2A), which means are situated in the combustion zone (4); said device being characterized in that the protective means are formed by a plurality of plates (13) that extend at some distance away from or else against the inside well (2A), and that are mutually overlapping in part so as to protect the inside wall (2A) thermally. Methods and devices for bituminous coated materials.
Abstract:
A method of making hot mix asphalt using recycled asphalt in which tertiary air is mixed with products of combustion at an exit of a refractory-lined chamber to produce hot controlled temperature process air, the temperature of the tertiary air being increased while the temperature of the products of combustion is decreased to adjust a temperature of the hot controlled temperature process air. Particles of the recycled asphalt are heated by exposing the particles to the hot controlled temperature process air in the rotary counter-flow dryer and mixer and moisture is removed from the recycled asphalt with the hot controlled temperature process air.
Abstract:
The present disclosure relates to industrial equipment for the hot recycling of asphalt mixes. The industrial equipment may comprise a portable bank of hoppers which may be used to meter RAP and unadulterated petrous materials and may be mounted on a supporting structure, along with gear motors which control the metering and send a signal to a flow indicator in a control panel where it may be recorded and controlled. A conveyor belt may be provided below the hopper bank in order to receive the material and transport same to a rotary cylinder comprising an industrial open-flame burner that may be used to transmit heat energy indirectly to the RAP and to the supply of unadulterated petrous material. In some embodiments, the present disclosure may also comprise: a tank for storing a mixture of asphalt and rejuvenating agent enhanced with polymers, which may be metered using a volumetric gear pump through a pipe towards the rotary cylinder, the outlet of said cylinder comprising a temperature sensor that may send a signal to the recycled asphalt mix temperature indicator in the control panel; a recycled asphalt mix lifting system which may convey said mix to a discharge silo; a combustion gas extractor which may discharge combustion gases from the burner; a fuel storage tank which may be used in the industrial burner; and a weight measuring element which may be at the inlet of the rotary drum.
Abstract:
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.
Abstract:
The disclosure is directed to a warm mix asphalt comprising a hydrated lime slurry additive, methods of producing the same, methods of producing an asphalt pavement and methods of paving a surface.
Abstract:
The present disclosure relates to industrial equipment for the hot recycling of asphalt mixes. The industrial equipment may comprise a portable bank of hoppers which may be used to meter RAP and unadulterated petrous materials and may be mounted on a supporting structure, along with gear motors which control the metering and send a signal to a flow indicator in a control panel where it may be recorded and controlled. A conveyor belt may be provided below the hopper bank in order to receive the material and transport same to a rotary cylinder comprising an industrial open- flame burner that may be used to transmit heat energy indirectly to the RAP and to the supply of unadulterated petrous material. In some embodiments, the present disclosure may also comprise: a tank for storing a mixture of asphalt and rejuvenating agent enhanced with polymers, which may be metered using a volumetric gear pump through a pipe towards the rotary cylinder, the outlet of said cylinder comprising a temperature sensor that may send a signal to the recycled asphalt mix temperature indicator in the control panel; a recycled asphalt mix lifting system which may convey said mix to a discharge silo; a combustion gas extractor which may discharge combustion gases from the burner; a fuel storage tank which may be used in the industrial burner; and a weight measuring element which may be at the inlet of the rotary drum.
Abstract:
An HMA plant which uses combination direct exhaust heated and indirectly steam heated pre-heating drum in combination with a sealed indirect hot oil heated rotary shaft mixer, where the steam given off from the heated HMA is maintained, separated from the sulfur containing exhaust of a hot oil heater, so as to minimize the production of acid in liquid form.
Abstract:
A dryer (10) for an asphalt plant is disclosed. In one embodiment, the dryer (10) includes a generally cylindrical drum (12); a burner (20) having a burner head (22) at least partially disposed within the drum (12); a feeder (26) attached to a stationary portion of the dryer (10) for providing a recycled asphalt pavement; and an adjustable inlet (28) for introducing the recycled asphalt pavement from the feeder (26) into the drum (12) at a desired position. The adjustable inlet (28) is adjustable laterally between at least two positions.
Abstract:
A counter-flow drum mixer asphalt plant equipped with a secondary feeder for introducing RAP to direct radiant heat of the combustion zone. Heated virgin aggregate and RAP in the combustion zone are delivered through a transition piece to a first stage of the mixing zone where liquid asphalt is combined with the materials and secondary combustion air flows through the first stage to evacuate blue smoke and steam back to the combustion zone. The second stage of the mixing zone is substantially isolated from secondary combustion air flow where dust and mineral fines are introduced and mixed to complete the asphalt product discharged from the mixing zone. Alternative constructions of the mixing zone are disclosed to provide the first and second stages having such characteristics, as well as options for both the passive and active control of the secondary combustion air. An optional secondary burner in the exhaust housing elevates the temperature of the exhaust gas above its dew point temperature before delivery to the baghouse.
Abstract:
A method for operating a counter-flow aggregate dryer for an asphalt plant in which primary aggregate materials are introduced into a first end of a horizontally rotating cylinder and travel to the second, discharge end of the cylinder through drying and combustion zones. Hot gases are generated in the combustion zone to flow in counter-current heat exchange relationship with the aggregate materials for discharge from the first end of the cylinder to air pollution control equipment. Secondary materials like RAP or virgin aggregates are fed directly into the combustion zone. The discharge gas stream is heated above its dew point prior to delivery to air pollution control equipment.