Working Principle of a Disc Centrifuge
A disc centrifuge is a highly efficient device that uses the principle of centrifugal sedimentation for liquid separation.
Its internal structure consists of a rotating drum, disc assembly, feeding system, discharging system, and slag removal mechanism.
Basic Principle:
When a mixed emulsion enters the high-speed rotating drum, the centrifugal force field causes components of different densities to separate into layers:
Higher density impurities and solids are thrown to the outer edges;
Lower density fat globules concentrate in the central area;
The middle layer of skim milk flows out from the outlet.
The discs play a crucial role here, significantly shortening the separation distance and increasing the sedimentation area, thereby increasing the separation efficiency by tens of times.
Typical Applications of Disc Centrifuges in the Dairy Industry
(I) Raw Milk Clarification
During collection and transportation, raw milk may become contaminated with fine impurities, cell debris, dust, and other suspended particles.
If these impurities are not removed promptly, they not only affect the color and flavor of the milk but may also cause equipment blockage and microbial growth.
Disc centrifuges can complete efficient solid-liquid separation in seconds:
Removing fine suspended solids and contaminants;
Reducing total bacterial count and improving hygiene standards;
Protecting the subsequent pasteurization system.
Typical Model: CL Series Dairy Clarifier
Processing Capacity: 3,000–15,000 L/h
(II) Milk Skimming
Skimming is one of the most important steps in dairy processing.
Through the high-precision control of disc centrifuges, stable production of products with different fat contents, such as whole milk, semi-skimmed milk, and skimmed milk, can be achieved.
The working process is as follows:
Raw milk separates into layers under centrifugal force;
Fat globules gather at the center, forming a cream layer;
Skimmed milk is thrown to the outside and discharged;
The dual-channel design allows for the simultaneous output of both types of emulsion.
This method is not only fast (completed within seconds) but also allows for precise control of fat content, achieving levels below 0.03%.
(III) Whey and Protein Recovery
A large amount of whey is generated during cheese or casein production.
Whey is rich in whey protein and lactose; direct discharge not only wastes resources but also burdens the environment.
Disc centrifuges can separate trace amounts of fat globules and solid impurities from whey, thereby:
Increasing whey protein recovery rate;
Improving whey purity;
Reducing the load on subsequent membrane filtration.
This precision separation technology enables dairy companies to create higher economic value from byproducts.
Core Technological Advantages of Disc Centrifuges
1. High-Speed Separation and High-Precision Control
The disc array forms hundreds of separation surfaces, effectively accelerating the sedimentation process over a very short distance.
The relative motion between the drum and the liquid is optimized, ensuring stable separation accuracy at the micron level.
2. Hygienic Design
Materials in contact with materials are made of 316L stainless steel;
All welds are mirror-polished;
Equipped with a CIP online cleaning system.
3. Automatic Slag Removal System
Equipped with a hydraulic or pneumatic automatic slag removal mechanism;
Timed and quantitative slag removal is possible without downtime;
Fast solid discharge reduces material loss.
Disc centrifuges, with their high efficiency, hygiene, and intelligent features, are becoming core equipment in the modern dairy industry. They ensure every drop of milk is purer, production is more efficient, and businesses stand out in a fiercely competitive market.
Whether it’s the upgrading of traditional dairy production or the emerging market of plant-based beverages, disc centrifuges will continue to drive the high-quality development of the dairy industry with their high-speed rotation.
