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Jiangsu Shengman Technology Engineering Co., Ltd
What is the process principle of centrifugal spray drying tower?
Date: 2025-09-23Read: 30
Centrifugal spray drying tower is a kind of drying equipment widely used in food, chemical, pharmaceutical and other industries. Its process principle is mainly based on the two core processes of centrifugal atomization and hot air drying. The following is a detailed explanation of its process principle:
1. Centrifugal atomization process
The core component of the centrifugal spray drying tower is the high-speed rotating centrifugal atomizer, whose rotational speed can usually reach thousands to tens of thousands of revolutions per minute. After entering the atomizer through the conveying system, the liquid raw material is thrown towards the edge by the centrifugal force generated by high-speed rotation, forming extremely small droplets (usually with a diameter of 15-75 microns). This process is similar to a rapidly rotating rope throwing out small objects, and the size of the droplets directly affects the drying efficiency and product quality.
2. Hot air drying process
The heated hot air (usually at a temperature of 220-230 ℃) uniformly enters from the top or side of the drying tower and comes into contact with the atomized droplets in parallel or counter current. Hot air, as a heat transfer medium, rapidly transfers heat to droplets, causing their surface moisture to evaporate. As the water evaporates, the droplets gradually solidify into particles and are eventually collected at the bottom of the tower. The exhaust gas is discharged from the system through a fan.
3. Process flow steps
Liquid preparation: The liquid raw material is filtered and transported to the atomizer.
Atomization stage: The centrifugal atomizer disperses the liquid into tiny droplets.
Drying stage: Droplets come into contact with hot air, causing rapid evaporation of moisture.
Particle collection: The dried particles are separated by a cyclone separator or a bag collector.
Waste gas treatment: Wet waste gas is discharged after dust removal.
4. Technical features
Efficiency: Atomization and drying are carried out simultaneously, with fast processing speed.
Uniformity: Centrifugal atomization ensures uniform droplet size.
Adaptability: Can handle high viscosity or solid containing liquids.
Controllability: Control product characteristics by adjusting parameters such as speed and temperature.
This process achieves the conversion of liquid to solid through physical means, avoiding the damage of high temperature to thermosensitive materials, and is an ideal choice for industrial continuous production.
