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Working principle and characteristics of centrifugal spray granulation dryer
Date: 2025-06-13Read: 8
The centrifugal spray granulation dryer combines centrifugal atomization and spray drying technologies, and is suitable for transforming liquid materials (especially high viscosity and high concentration liquid materials) into spherical particles with specific particle size. Its working principle and core characteristics are as follows:
1、 Working principle
1. Centrifugal atomization
The liquid is pumped to the centrifugal atomizer at the top of the drying tower, where it is subjected to centrifugal force on a high-speed rotating atomizing disc (with a speed of thousands to tens of thousands of revolutions per minute), forming a liquid film that spreads towards the edge and ultimately splits into extremely fine droplets (with adjustable particle size).
The atomization effect depends on the rotational speed, liquid viscosity, surface tension, and feed rate. High speed rotation can ensure uniform and fine droplets.
2. Hot air drying and granulation
The hot air enters the drying tower in a spiral shape through the distributor, and comes into contact with the mist droplets in parallel. The moisture evaporates rapidly within 10-30 seconds, forming dry particles.
Granulation process: A binder is added to the liquid, and the droplets shrink into spherical particles due to surface tension during the drying process. The target particle size distribution is achieved by adjusting process parameters such as temperature and atomization particle size.
3. Particle separation
The dried particles settle to the bottom of the tower due to gravity and are collected. The fine powder carried by the exhaust gas is recovered through a cyclone separator or bag filter, achieving efficient separation.
2、 Core Features
1. Processing capability and material adaptability
It can handle high viscosity, high concentration suspensions and paste like liquids, suitable for industries such as ceramics, chemicals, pharmaceuticals, and food.
Support non-standard customization to meet the drying needs of large-scale and special materials.
2. Product quality advantage
Spherical particles: The particles have high sphericity, excellent fluidity, dispersibility, and solubility, reducing the content of fine powder.
Controllable particle size: By adjusting parameters such as atomizer speed and liquid properties, the particle size and distribution curve can be accurately controlled.
3. Process efficiency characteristics
Fast drying speed: The surface area of the droplets is large, and the moisture evaporates instantly (about 10-30 seconds), making it suitable for heat sensitive materials.
High energy consumption but outstanding efficiency: Although the energy consumption is higher than some drying methods, continuous production and automation control (PLC system) significantly improve efficiency.
4. Operation and design optimization
Fully automatic control: Real time monitoring of temperature, pressure, speed and other parameters to ensure process stability.
Anti sticking wall design: Optimize the distribution of hot air and tower structure to reduce material sticking to the wall.
3、 Typical application scenarios
1. Precision materials field: industries that require specific particle sizes, such as electronic ceramics, magnetic materials, and new energy materials.
2. Biopharmaceuticals and Food: Preparation of spherical particles of thermosensitive materials such as milk powder and drug extracts.
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