What is Asphalt Counter Flow Mix Plant?
In Asphalt Counter flow Mix Plant, burner is located at the discharge or lower /end of drum. The burner flam move upstream, opposite to the aggregate flow, where you get effective mixing in separate twin-shaft or paddle mixers as wear and tear are minimum and it is easy to maintain.
Process of Asphalt Counter Flow Mix Plant
In Asphalt counter flow mix plant, Weight the virgin aggregates individually from the cold feed bins gate, with variable, continuous, and automatic speed of belt in the proportion indicated by the control systems. The aggregates that have been weighed are transferred to the dryer by charging conveyor, The aggregate dryer is the main component in the process. Here the moisture in the combined aggregates is removed as the material is heated from ambient temperature to the desired mixing temperature as required. In dryer, burner is located at the discharge or lower /end of drum where the drying process is done in order to remove the water / moisture from the aggregates to reach the correct mixing temperature. The flow of aggregates is anticlockwise to the flow of hot gasses coming from the flame of the burner. This is the main typical process to known as counter flow plant with separate pugmill. Once they are dry and heated, the aggregates go on to the external pugmill and simultaneously bitumen pumping unit pump bitumen directly into the pugmill on top of the dry and hot aggregates. The mix material are propelled towards the discharge and dam gate provided at the discharge.
RAP System Process
For Recycled Asphalt Mixtures, a separate cold feed bin arrangement is used for the reclaimed material, the bin or bins are equipped with a variable speed belt conveyor under each bin. The bins are also provided with a gate which can be set at various openings. The reclaimed aggregates are deposited on the feeder conveyor and then transferred to a gathering conveyor. Most often, the asphalt coated aggregates are then passed through a scalping screen to remove any oversize pieces of asphalt mixture or deleterious material. Thus the handling of the reclaimed material is similar to the feeding of new aggregates. Thus the entry of the reclaimed material is separated from the charging of the new coarse and fine aggregates. The reclaimed asphalt material is fed into the drum through a rotary inlet system located at or near the midpoint of the drum.
The hot aggregates go on to the external mixer and simultaneously bitumen pumping unit pump bitumen directly into the mixer on top of the dry and hot aggregates, following the commands of the control system.
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