Counter Flow Asphalt Plants and Asphalt Mix Plants

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Atlas Technologies
Counter Flow Asphalt Plants and
Asphalt Mix Plants
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• There are primarily two variants of asphalt drum
  mix plants. One is parallel flow and another is
  counter flow. In the former, mixing and drying
  happen together in a single drum, whereas in the
  latter, the processes are done separately.
• Every drum mix plant has seven major components,
  namely
• Cold aggregate feeder
• Drying and mixing unit
• Bitumen storage and transfer tanks
• Pollution control system
• Storage silos (where the hot mix materials are
  dumped) and
• Central control panel.
• Atlas Counterflow asphalt mix plants
• The function of the cold feed storage is to
  proportion the aggregates based on the precise
  requirements. It controls the aggregates
  accurately and feeds them. Cold aggregate feeder
  bins can be of any number like 2 or 4 or even 7.
  It all depends on the mixed material design to be
  used.
• Before the aggregates are transferred to the
  mixing chamber, they are weighed and this is
  synchronized with the weight of the bitumen. In a
  separate conveyor where the aggregates are
  charged, load cells are used to equip the
  conveyor to measure the collective weight of the
  aggregates when they are moved to the drying
  drum. Depending on the reading of the aggregate
  weight, the proportion of bitumen is decided and
  introduced into the mix.

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• Single drum plants type parallel flow function by
  directing the flame and flow of the aggregates
  parallel to one another and is therefore called
  parallel flow. This results in less efficiency
  and more power usage. Alternately, in a double
  drum asphalt plant, the directions of flame and
  flow are different, opposite to be precise which
  is why they are called counterflow plants. The
  counter flow is designed for efficient use of
  energy in the burner and complete removal of
  moisture. In a counterflow plant, the zones for
  heating and mixing can also be separate leading
  to an efficient product.
• Atlas Technologies manufacture both kinds of
  asphalt plants, those with integrated mixing and
  those with separate mixing. In single units, both
  heating and mixing happens simultaneously in one
  place and the dust is exhausted from the system
  after mixing. That results in a good quality hot
  mix. As opposed to that, double drum asphalt
  mixers use separate mixing and drying chambers
  and the residual dust from the aggregate is
  sucked out by the pollution control device which
  is located at the very inlet of the aggregate.
  This makes dust-free aggregates possible even
  before they are loaded into the drum. As a
  consequence, the quality of mixture produced is
  better quality as opposed to single drum
  parallel-flow type plants.
• Due to the use of a single drum in a single drum
  mix asphalt plant, the temperature of the
  aggregates when heated up cannot always be
  controlled. In double drum plants, it can be
  effectively controlled even before the mixture is
  transferred into the mixing drum.

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• If the burner flame shoots up suddenly and cannot
  be controlled, this can lead to a fire outbreak
  inside the system resulting in the burning of the
  hot mixture when discharged at the outlet. For
  this reason, separate heating and mixing of
  aggregates are always safer. In individualized
  processing, the burner flame does not come in
  contact with the asphalt or any of the other
  materials in the mix. That way, the asphalt is
  never at the risk of coming in contact with
  extreme temperatures.
• Also, in counterflow asphalt plants, there is no
  wastage as the final output accounts for all
  input materials. The end product mix material is
  much better in quality in a counterflow type of
  asphalt plant.

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• Contact US
• Atlas Technologies Pvt. Ltd.
• Block No. 97, Mehsana-Ahmedabad Highway,
• Behind Bhupendra Crane House, At Po. Ditasan -
  382710
• District Mehsana, Gujarat, India.
• Export inquiries 91 97238 10565
• Email contact_at_atlastechnologiesindia.com