Parameters that affect the separation effect of the Decanter Centrifuge

To understand the separation effect of the Decanter Centrifuge, first understand its working principle, so that it can be effectively controlled during use.

Centrifuge speed
The adjustment of the drum speed is usually achieved through a variable frequency motor or a hydraulic motor. The increase in the drum speed will improve the separation effect. The higher the speed, the greater the centrifugal force, which helps to increase the solid content of the mud cake.

Increasing the speed difference between the spiral and the drum will increase the processing capacity, but too fast a speed will destroy the sludge flocs, which will reduce the dehydration effect. The higher the speed, the higher the solid dryness. In addition, a higher speed will cause the machine to vibrate, increase the wear of the machine, and increase power consumption, vibration and level accordingly, reducing the service life of the equipment. Therefore, it is necessary to choose a reasonable speed that can meet the separation requirements.

Centrifuge processing capacity
The feed flow rate will affect the retention time of the material in the equipment, and thus affect the separation effect. A smaller processing capacity will reduce the axial flow rate of the feed liquid, and the residence time of the treated liquid in the drum will become longer, so the separation effect is relatively good; conversely, too large a feed flow rate will reduce the separation effect.

In addition, the feed flow rate is also related to the solid content of the feed liquid and the slag removal capacity of the centrifuge screw. Excessive feed flow may cause drum blockage and affect the separation effect. Therefore, the feed flow rate should be reasonably selected to match the solid content of the feed liquid and the separation requirements.

Overflow plate diameter
The large end of the drum is equipped with an overflow plate, and the liquid depth of the liquid ring layer can be controlled by adjusting the diameter of the overflow plate. The overflow plate with a small diameter can increase the depth of the liquid ring layer, making the separation liquid clear; conversely, if the overflow plate diameter is increased, the clarity of the obtained separation liquid will be low and the separation effect will be poor.

Differential speed between the drum and the screw
The differential speed directly affects the slag removal capacity, mud cake degree and filtrate quality, and is one of the important parameters that need to be adjusted according to the operating conditions during the operation of the Decanter Centrifuge.

Smaller differential speed has better separation effect, but it is easy to cause blockage due to the longer residence time of solid phase particles in the drum; larger differential speed has poor separation effect due to the large disturbance of the spiral on the liquid layer, but has better slag removal capacity.

Therefore, the differential speed can be determined according to the material properties, processing volume, processing requirements and centrifuge structural parameters. Small solid content matches small differential speed, and large solid content matches large differential speed.

Aspect ratio
The larger the aspect ratio of the horizontal spiral centrifuge, the stronger its processing capacity and the better the separation effect.

Characteristics of suspension
The solid phase particles in the material are of different sizes, and the centrifugal force they are subjected to is different, so the separation effect is also different. The larger the particles, the easier it is to separate; too small particles are easy to mix in the separation liquid and overflow with the separation liquid.

In addition, the specific gravity difference between the solid and liquid phases and the viscosity of the suspension also affect the separation effect. The larger the specific gravity difference between the solid and liquid phases, the easier it is to separate, and the smaller the viscosity of the suspension, the easier it is to separate.

Of course, in addition to the above factors, there are many factors that affect the separation effect of the horizontal spiral centrifuge, such as the thickness of the liquid ring layer and the process. HL Petroleum is a professional centrifuge manufacturer. We have 20 years of equipment research and development and production experience, and provide various types of centrifuge and solid control equipment. If you are interested in our equipment, please feel free to consult us!