Asphalt Drum Mixing Plant
Cap 20 to 160 TPH
Asphalt Drum Mixing Plant ( Cap 20 to 160 TPH )
According to the most recent M.O.R.T.H. specifications, Shreeji automatic Asphalt Stationary Drum Mix facilities are created and constructed to provide trouble-free operation with exceptional fuel efficiency. Our commitment to provide the best products possible to our customers has led to excellent and unparalleled product refinement in our asphalt mixing facilities today.
Machinery in Drum Mixing Plant
1) Drying And Mixing Unit
The Drum does two operations: Drying and mixing. Rotating Drum is equipped with flights which help in drying the aggregates in first half of the drum and in the second half of the drum, the aggregates are mixed with bitumen filler material.
Parallel flow drying & mixing unit allows more mixing time to ensure uniform mixture.
2) Cold Aggregate Four-bin Feeder
This is the very first step. Different sized aggregates are fed into the different feeder bins. This helps in getting proper proportion of each size as per the need.
Each bin will have individual gear and variable speed drive motor. It is possible to control the speed of each bin to get proper proportion of each item.
3) Pollution Control Unit [Optional]
VENTURI type wet dust collectors are highly efficient and are known to maintain required environmental standards. The extreme turbulence leads to superb entrapping of dust laden exhaust gas. Large size stainless steel nozzles provide a clog-free operation to ensure optimum cleaning efficiency.
4) Pressure Jet Oil Burner
This is a simplest system where the burner has Three firing rates. The burner operates first at the lower firing rate and then switches to full firing as needed. The burner can also revert to the low fire position at reduced loads, again limiting thermal stresses within the system.
It does not consist of any complex parts or electronic components and is very easy to replace.
5) Bitumen Tank
Bitumen tanks act as storage point for bitumen used in the asphalt plant. These tank storage and heat Bitumen so that it can be used in the drum mixer for mixing with hot aggregate. Bitumen tank comes in different sizes starting from 15 tons to 30 tons as per the customers requirement.
The bitumen inside the tank is heated by burner. It helps to achieve higher thermal ratings, reduce emissions .
6) Control Cabin & Panel
Control cabin with on board electric power console, distribution, switch board, fully automatic processes are a standard on Shreeji plants. It displays the entire process control parameters while panel enables the plant to run in auto & manual mode.
Separate temperature controller and GOB hopper timer from totalizer reduces maintenance cost.
User friendly software ensures top notch performance.
Provision to store, edit production details, mix proportions, etc is possible.
Process Of Asphalt Drum Mixing Plant
The operation of parallelflow type of asphalt mixing plant is a continuous process where the ingredients are added by proportions to the cold feed bins. The feeder bins store the cold aggregates in separate bins and transfer the same to the drying drum. The main difference between this process and the batch plants starts here. Here there is a single drum which heats and mixes in a single chamber (drum). Aggregates are introduced to the burner end of the drum and the flow of aggregates and the burner flame is parallel to each other and hence the name Asphalt Drum Mixing Plant. Before introduction into the drum, the aggregates have to pass through a primary scalping screen. This will help to remove the oversized aggregates and prevent them from entering the drum. Once the cold aggregates enter the drum, they are treated by the flame which makes them hot and ready for mixing with the hot bitumen and other additive. As the drum rotates, the aggregates move towards the other end of the drum. Liquid bitumen is added to the aggregates on the other half of the drum. This liquid bitumen flows by a pump which is controlled by a variable speed drive. So the flow of aggregates determine the addition of bitumen and minerals into the drum. If the aggregate flow is more, the control panel sends message to the bitumen drive which sends the bitumen in set proportion to the aggregates. If the aggregate flow drops, the control panel will send signal to the bitumen drive thereby decreasing the inflow of the bitumen into the drum. Minerals and RAP are also added into the second half of the drum where the temperature is much lower. The introduction of minerals and recycled asphalt is also controlled by a variable speed drive just like the bitumen.
The exhaust gases are sucked towards the discharge end of the drum and are treated first by primary and then by secondary dust collector. Primary dust collector is a cyclone device which traps most of the heavy dust and settles them not allowing them to enter the secondary dust collector. Secondary dust collector is usually venture scrubber type wet dust collector or a bag house filter which settles the lighter particles and prevent them from escaping. Wet dust collectors use water jets to trap and treat them to cyclonic effect to settle the dust. Bag filters do not require water to clean and it cleans the dust by trapping them to bags made of special material designed for this purpose.
The mixed material is dispatched from the other end of the drum and is transferred to a storage silo or to a truck. If it is transferred to a hot mix silo, it can be loaded into the truck.