Separation centrifuges working principle and common types

- May 17, 2019-

The separation centrifuge is a centrifuge for realizing the separation process. Its working principle is the same as that of the decanter centrifuge, and the separation effect is better. The solid solution of the emulsion and the ultrafine particles of the separation liquid-liquid system is separated. At this time, a great centripetal acceleration is required to generate sufficient inertial centrifugal force to separate it, which requires the centrifuge to have a high rotational speed. The centrifugal pressure of the drum wall is proportional to the square of the drum radius, and is also proportional to the square of the rotational speed. In order to generate a very high rotational speed, and the drum wall does not cause excessive stress, a small diameter drum is required.


Separating centrifuges commonly used are disc separators, tube separators, and chamber separators. The disc separators place a plurality of conical discs that are spaced apart from each other in the drum for less solid phase loading. The suspension is subjected to liquid phase clarification or solid phase concentration and separation of the emulsion.


The tubular separator has a small diameter, a large height, and a good separation effect, and is suitable for treating difficult-to-separate emulsions and suspensions. It is commonly used for the separation of oil, water, microorganisms and proteins, as well as the clarification of essential oils and nitrocellulose. The chamber separator inserts a plurality of concentric cylindrical partitions in the drum, and divides the drum into a plurality of chambers. The separated suspension enters from the center, flows through the chambers in turn, and finally separates from the outer layer. The liquid, solid phase particles settle in each chamber and are suitable for the treatment of difficult to separate, low concentration suspensions and emulsions.


Disc separators have important applications in the food industry. For example, tubular separators are commonly used for the dehydration of animal oils, vegetable meal and fish oil for the clarification of juices, apple syrups and syrups. Disc separators are widely used in the dairy industry for cream separation and milk purification, for dehydration and clarification in animal fats and vegetable oils, fish oil refining, and also for juice clarification.