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Changzhou Ruiting Drying Engineering Co., Ltd
Working principle and characteristics of rotary kiln dryer
Date: 2025-05-15Read: 6
Rotary kiln dryers are suitable for industries such as chemical, metallurgical, and building materials, such as gypsum drying, slag treatment, and drying of new energy materials (such as silicon mud). Its working principle and characteristics are as follows:
1、 Working principle
1. Material conveying and flipping
Wet materials enter the tilted cylinder from the feeding end. When the cylinder rotates at low speed, the internal plate repeatedly picks up and throws the materials, forming a uniform material curtain and enhancing the contact efficiency with the heat medium.
2. Heat exchange mechanism
Direct heating type: High temperature gas (400-800 ℃) flows in reverse or forward direction with the material, achieving water evaporation through conduction, convection, and radiation heat transfer.
Indirect heating type (such as steam/electromagnetic heating): The heat source (steam, thermal oil, or electromagnetic) transfers heat indirectly through the cylinder wall or built-in tube, avoiding direct contact between the material and the flue gas.
3. Waste gas treatment
Wet exhaust gas is discharged after dust removal by a cyclone separator, and some equipment uses negative pressure operation to prevent dust from overflowing.
2、 Core Features
1. Wide applicability
It can handle granular, powdery or viscous materials (such as photovoltaic silicon sludge), especially suitable for materials with low moisture content (≤ 30%).
The direct heating type is suitable for high humidity materials, while the indirect heating type is suitable for heat sensitive or easily oxidizable materials.
2. Diversified heat sources
Support multiple heat sources such as gas, steam, electromagnetic induction, and thermal oil to meet different process requirements.
3. Efficient and energy-saving
The cylinder design extends the residence time of materials and achieves high heat utilization efficiency; Multi layer laminated structure enhances heat exchange.
The electromagnetic heating system precisely controls temperature through eddy current effect, reducing energy loss.
4. Strong operational stability
Continuous production with a large processing capacity (up to 100 tons per day per machine) and adjustable parameters (inclination angle, speed, etc.).
The sealing structure combined with negative pressure operation reduces the risk of dust leakage.
5. Modular design
Equipped with vibrators, valves, and other devices at the inlet/outlet end to ensure smooth material transportation; The support frame and supporting wheel system ensure the smooth operation of the cylinder.
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