The user selects a suitable centrifuge according to the use occasion, material properties and other factors to achieve the intended purpose. There are three issues that must be considered when selecting a model:
1 Anti-corrosion performance: The materials separated by the centrifuge are generally corrosive, and the material in contact with the material must meet the corrosion resistance requirements to ensure safe use.
Structural material type (304, 321, 316L, titanium plate), sealing ring, gasket material, surface treatment measures (lining plastic, rubber lining, surface coating), and the material of the filter cloth should be determined at the time of selection. . The manufacturer can be informed of the nature of the material (chemical properties, temperature at the time of separation, etc.) at the time of selection so that the manufacturer can suggest the choice of centrifuge material based on the characteristics of the medium to be separated and indicate in the order to ensure The anti-corrosion requirements of the centrifuge.
2 Explosion-proof performance: If the material (or environment) treated by the centrifuge contains flammable and explosive substances such as organic solvents, the centrifuge should have explosion-proof performance. The explosion-proof performance is determined according to the explosion-proof requirements (grade) of the process. In the explosion-proof occasions previously involved, only the explosion-proof motor was proposed. In the past two years, most of the cases where the treated materials contain organic solvents such as solvents have been proposed. In fact, the centrifuge should achieve real explosion protection, and take various measures in terms of mechanical, electrical control, and accessory configuration, such as: electronic control system: explosion-proof isolation barrier, non-contact energy-consuming braking system, static electricity Grounding, explosion-proof automatic control.
Mechanical system: explosion-proof motor, explosion-proof lighting, anti-collision measures, anti-static transmission belt.
Explosion-proof accessories: nitrogen protection device, nitrogen online detection, on-site explosion-proof control button.
Therefore, in the case of explosion-proof requirements, the user should specify the separated medium, explosion-proof requirements and grades when ordering, configure the corresponding equipment and take appropriate measures to meet the explosion-proof requirements.
3 separation performance
Separation performance is one of the most basic functions, including separation effects, washing effects, processing power, and automation. At the beginning of the order, it is difficult to accurately determine the final separation effect due to the difference in material properties, including the viscosity, particle size, density, solid-liquid ratio of the slurry, etc., generally measured by the separation factor of the centrifuge. The separation effect of the centrifuge.
The separation factor is related to the rotational speed of the drum and the diameter of the drum, and is squared with the angular velocity of the drum.
Ft=ωr2/g
Where: Ft is the separation factor ω is the drum angular velocity r/sr is the drum diameter mmg is the gravity acceleration
The washing mentioned here refers to the washing of the filter cake. For some materials, the filter cake needs to be washed by the washing liquid, and some even have to be washed several times to meet the requirements, which requires the configuration of the washing tube. The washing effect, washing time and washing tube diameter, arrangement position, and structural form have a great influence.
The processing capacity of the centrifuge is related to the physical and chemical properties of the material and the separation requirements. It is generally estimated by the number of cycles per hour and the weight of the filter cake in a single run.