What are the Two Types of Asphalt Plant
There mainly exists two basic asphalt plant types: continuous drum type and forced batch (or intermittent ) type according to technological process (or mixing mode).
Double Drum Asphalt Plant
When the aggregate enters the drum from the belt conveyor and passes through the flap gate, the double barrel process sequence begins, minimizing air leakage in the drum to a certain extent. The drum transfers heat from the burner to the aggregate through a series of shielding layers. Then the aggregate flows out of the inner barrel and falls into the outer barrel shell. In the flame-less environment, the paddle successively mixes the liquid asphalt and dust (filler).
Double drum asphalt mixing plant is one of asphalt mixing plants, which is designed according to a new continuous mixing process. It skillfully combines the advantages of intermittent and drum mixing equipment to avoid their respective disadvantages. So what are the features of this novel continuous mixing process? This article will give you a brief introduction.
Higher Thermal Efficiency
The cold aggregate drying completely adopts the same counter flow scheme as the batch asphalt mixing plant, which has higher thermal efficiency than the co-current process commonly used in the drum asphalt mixing plant, and can heat the new aggregate to a high temperature of 370 ℃. The heat transferred from the hot gas to the shell of the dryer drum will not enter the atmosphere and be dissipated. The fuel consumption can be saved about 10% compared with the common drum asphalt mixing plant.
Higher Efficiency of Productivity
The mixture in the double drum will not contact with gas and flame, nor will there be an environment of steam fractionation, so the problems of asphalt aging, powder running and blue smoke in the drum asphalt mixing plant have been completely solved.
Better Mixing Quality
The double drum mixing plant adopts the forced mixing process with mixing time of 60-90 seconds, which can fully mix the mixture, thus it can produce the asphalt mixture fully meeting the mixing quality required.
The double drum asphalt mixing plant maintains the advantages of the drum type mixing equipment. It is featured by simple structure and light weight, which greatly improves the reliability of the equipment and reduces the workload of installation and maintenance.
A Promising Outlook
In addition to the above advantages, the potential advantages of double drum asphalt mixing plant in the development prospect are also very optimistic.
Firstly, the double drum mixing plant has great potential advantages in improving production capacity and cutting manufacturing costs.
Secondly, it shrinks the cost of maintenance, fuel, and depreciation, etc., the cost per ton of mixture produced by the double drum mixing plant is about 10% lower than that of the batch asphalt mixing plant.
Finally, the most important potential is the capacity of double drum mixing plant receiving high proportion of reclaimed materials, which can accommodate up to 50%~60% of reclaimed materials.
Mobile Asphalt Plant
The mobile asphalt mixing plant: refers to the plant which is mounted on a trailer frame and can be transferred based on the different construction sites. It is suitable for these projects such as the county-rural roads, low grade highways, road maintenance and mountainous highway.
What is an Asphalt Batch Plant?
The asphalt batch (or intermittent) plant is the plant that the heating and drying of cold aggregate and the mixing of mixture are forced to be carried out in batches or periodically. The process characteristics of batch mixing plant are: various components are put into the mixer for mixing after being measured in batches. A batch of mixed finished materials is discharged out of the mixer, and the mixing of the next batch of ingredients is then carried out, thus forming a cycle operation process.
Drum Mix Asphalt Plant
The drum mix asphalt plant, also named continuous drum asphalt mix plant is the plant that heating and drying of the cold aggregate and the stirring of mixture are continuously carried out in the same assembly device (drying and mixing drum). The production process of the asphalt mixture is that each component (gravel, sand, stone powder, asphalt, etc.) is continuously and dynamically measured in proportion, and continuously fed and drum drop mixed.
Parallel Flow Asphalt Plant
Drum mix asphalt plants has two types: parallel flow and counter flow. In most instances, the drum mix asphalt plants are equal to the parallel flow asphalt plants. As for parallel flow type asphalt plants, the drying and mixing is done in the same drum. In counter flow asphalt plants, drying and mixing is separate relatively in dryer drum and mixing tank.
Asphalt Plant Equipment
The whole equipment of asphalt plant is composed of the following systems: cold aggregate feeder system, drying system, combustion system, hot aggregate lifting system, screening system, hot aggregate storage system, weighing system, mixing system, dust removal system, filler supply system, dust recovery system, finished material lifting and storage system, pneumatic system, control system, asphalt storage and supply system, thus forming a complete mixing process.
Asphalt Plant Manufacturers
There are many well-known asphalt equipment manufacturers all over the world. They have played a decisive role in the market and led the future development direction of the industry. The following will introduce top3 asphalt mixing plant manufacturers in the world.
Ammann is the world’s leading mixing plant supplier. It is committed to the construction industry with its core professional road and traffic infrastructure products and services. This family business has enjoyed international success since 1869. Ammann group has a comprehensive and mature product line, and its products are distributed all over the world.
- Founded: 1869
- Country: Switzerland
- Product Category: Batch Mixing Facility, Continuous Mixing Facility
- Capacity Range: 80t/h ~ 400t/h
- Model: ABP HRT, ABP UNIVERSAL, ABM EASYBATCH, ACC COUNTERMIX, ACM PRIME, etc.
Founded in 1899 in Alfonsine, Italy, Marini is a famous manufacturer of asphalt mixing plants. The mixing plant business division of Faya group, which is dominated by the Marini brand, has seven manufacturing plants in the world: located in Italy, France, Brazil, Turkey, India and China, it produces various fixed, mobile and the latest urban environmental protection intermittent and continuous asphalt mixing plant equipment, and has mature asphalt mixing application technologies such as hot mixing, warm mixing and cold mixing.
- Founded: 1899
- Country: Italy
- Product Category: Batch Mix Plant, Continuous Mix Plant, Cold Mix Plant
- Capacity Range: 160t/h ~440t/h
- Model: Master Tower, Class Tower, Top tower, Be Tower, XPRESS.
Astec, founded in 1972, is a manufacturer of specialized equipment for asphalt road building, aggregate processing and concrete production, which is a leader in the production of both hot and warm mix asphalt equipment technology.
- Founded: 1972
- Country: America
- Product Range: Portable Hot Mix Station, Relocatable Hot Mix Station, Modular Batch Facility
- Capacity Range: 80t/h ~ 600t/h
- Model: Nomad™ Portable, Voyager™120/140, Six Pack® Portable, M-Pack™ Relocatable, BG1800/2200/2400/2800/3200
A rough survey on trade prices shows that manufacturers headquartered in Europe and the United States supply asphalt mixing plants at a price much higher than that of domestic counterparts. However, there is not much difference in the quality of asphalt plants produced by both sides. Compared with western manufacturers, Lutong machinery group has certain advantages due to its reasonable product price, guaranteed quality and long service cycle. Welcome to purchase.