Large Rotary Dryer
Large processing capacity and uniform drying: The drum structure has a high capacity and, when combined with internal copying, can process a variety of materials in batches while ensuring uniform heating and stable quality.
High thermal efficiency and economical operation: The design of multiple return routes extends the residence time of materials, fully exchanges heat, and achieves high thermal energy utilization efficiency, effectively reducing fuel costs.
Strong adaptability and wide application: It can handle block, granular, powdery, and sticky wet materials, and is widely used in multiple industries such as mining, chemical, and building materials.
Stable operation and easy maintenance: The structure is sturdy, made of wear-resistant materials, with low failure rate and high degree of automation, which can ensure continuous production and reduce maintenance costs.
Large Rotary Dryer is mainly composed of a hot air system, a rotary drum, inlet and outlet equipment, a dust removal system, and an electrical control system. Its core is composed of three concentric cylinders of different diameters, which are embedded and combined with each other according to specific mathematical relationships.
Drying process: Taking the three-stage process as an example, the material and hot air usually move in parallel. Wet materials and high-temperature hot air flow enter the inner cylinder together, and are lifted and scattered by the lifting plate inside the cylinder, forming a material curtain and moving forward; Afterwards, the materials pass through the middle and outer tubes in sequence, and the winding process prolongs the residence time of the materials, making the heat exchange more complete. The dried material is discharged through the discharge port.
Core principle: By utilizing the rotation of the drum and the internal lifting device, the material is continuously thrown and scattered during the drying process, forming a uniform material curtain, which fully contacts with the hot air and accelerates the evaporation of moisture. The inclined installation of the drum and the special angle of the lifting plate also ensure that the material can move steadily from the feeding end to the discharging end.
Main Features
1. High thermal efficiency and significant energy savings
The special three cylinder nested structure forms an insulation system on its own, and the heat emitted by the inner cylinder can be utilized by the outer cylinder, effectively reducing heat loss. Its thermal efficiency can reach 70% -80%, and compared to traditional single drum dryers, it can save 68% coal and 40% -60% electricity.
2. Large processing capacity and uniform drying
As a large continuous equipment, its processing capacity is enormous, with some models capable of processing 5000 kilograms or more per hour. The design of the internal lifting plate ensures that the material is repeatedly scattered and fully exposed to hot air, effectively ensuring the uniformity of drying.
3. Small footprint and low investment cost
Due to the clever nesting of the three cylinders together, the overall length of the three pass dryer is significantly reduced (about 60% shorter than that of a single cylinder dryer), and the foundation footprint can be reduced by about 50%, correspondingly reducing civil engineering investment.
4. Strong adaptability and stable operation
The equipment has a wide adaptability to fuel and can use various heat sources such as coal, oil, and gas according to the situation. At the same time, it can handle materials that are block shaped, granular, powdery, and even have a certain degree of viscosity. Adopting idler transmission, the structure is sturdy, the failure rate is low, and it can ensure long-term continuous and stable operation.
5. High degree of automation
The parameters such as drum speed, feeding amount, and air volume can be adjusted according to process conditions, and some models can achieve fully automatic operation and monitoring with fewer operators.
Large drum dryers are widely used in various industries such as biomass fuel, chemical, mineral, food, environmental protection, etc. They are suitable for drying materials such as sawdust, slag, mineral powder, starch, etc.
