An asphalt mixing plant is commonly used to mix several aggregates with bitumen to make hot mix paving material for various construction industries. The aggregates used may differ according to the grade and dimensions of asphalt required. Finer aggregates may also be added in addition to mineral fillers. There are two main varieties of asphalt mixing plants: continuous mix plants and batch mix plants. Both forms of plants produce asphalt their difference can be found in the technique used to produce said asphalt.
Working Principles Of Asphalt Batch Mixing Plant
1. Raw, unheated aggregates from different storage bins are fed to the cold aggregate feeder.
2. The aggregates are moved to the drying drum via a conveyor system.
3. The burner fueling the drying drum ensures the aggregates are dried effectively with heat.
4. The plant is fitted with a primary dust collector. That collector is perfect for filtering heavy dust particles, so there is certainly less pollution.
5. Once the aggregates are dry, they are moved to the tower unit by way of a bucket elevator.
6. Towards the top of the tower unit can be a multi-layered screening unit. As hot aggregates move through the multiple screens, they get treated with the screening effect.
7. Separate hot bins are widely used to store different kind of aggregates.
8. Bitumen is stored and heated in special tanks that are equipped with pumping equipment. The bitumen is pumped to the weighing hopper.
9. The aggregates are weighted and discharged in to the main mixing unit. Inside the mixer, filler materials and bitumen are mixed with the aggregates.
10. After mixing for the required time, the new asphalt is ready to be utilized. It is actually typically discharged into waiting tucks, but it is also sent to temporary storage silos.
11. The entire plant is controlled by way of a computerized control panel.
Elements Of An Asphalt Plant
1. Primary vibrating screen
2. Cold feed bins
3. Charging conveyor
4. Hot aggregate bucket elevator: The bucket elevator is comprised of an extensive, covered structure with many different buckets linked to a chain system. The heated aggregates are transported to the peak of your tower with this elevator unit.
5. Drying drum with burner: Perhaps the most important section of the plant. It really is compromised of any rotating drum and burner unit. The rotation ensures the aggregates are heated up evenly.
6. Pre-separator with bag filter: The bag filter is used to eliminate harmful dust particles and toxic gases through the plant’s emissions.
7. Hot bins
8. Multi-deck vibrating screens
9. Mixing unit: The mixing unit ensures all of the raw materials are combined effectively for your correct duration. Mixers are usually jacketed to ensure the contents remains hot and ready for discharge.
10. Weighing hoppers: The weighing hoppers are essential for ensuring the correct proportions of raw materials are brought to the mixing drum.
11. Bitumen storage tanks: Direct heating type tanks come with a burner. Meanwhile, indirect heating type tanks utilize an internal hot oil coil system for heating the bitumen.
12. User Interface: PLC panel having a touchscreen display and interface for convenient oversite and control of the plant.
13. Filler storage silo/hopper