The user should select a suitable centrifuge according to the use occasion, the nature of the material and other factors to achieve the intended purpose.
There are three issues that need attention in the selection:
1. Anti-corrosion performance: The materials separated by the centrifuge are generally corrosive, and the materials in contact with the materials need to be able to meet the requirements of corrosion resistance to ensure safe use.
The types of structural materials (304, 321, 316L, titanium plate), seal ring, gasket material, surface treatment measures (plastic lining, rubber lining, surface spray halar), and the material of the filter cloth, etc. should be selected during selection. determine. The manufacturer can be informed of the nature of the material (chemical properties, temperature during separation, etc.) during selection, so that the manufacturer can make recommendations for the selection of the centrifuge material according to the characteristics of the separated medium, and indicate it in the order to ensure Anti-corrosion requirements for centrifuges.
2. Explosion-proof performance: If the material (or environment) processed 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 by the explosion-proof requirements (grades) of the process. In the past, the explosion-proof occasions involved only proposed the configuration of explosion-proof motors. In the past two years, most of the places where the processed materials contain organic solvents such as solvents, nitrogen protection requirements have been proposed. In fact, to achieve true explosion protection for centrifuges, various measures must be taken in terms of machinery, electrical control, and accessories configuration, such as:
Electric control system: explosion-proof isolation barrier, non-contact energy-consuming braking system, electrostatic 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, for the occasions with explosion-proof requirements, the user should state the separated medium, explosion-proof requirements and grades when ordering, configure corresponding devices and take appropriate measures to meet the explosion-proof requirements.
3, separation performance
Separation performance is the basic function of the centrifuge, including separation effect, washing effect, processing capacity, degree of automation, etc. When ordering and selecting, it is difficult to accurately determine the effect of separation because of the differences in material properties, including the viscosity, particle size and distribution, density, and the solid-liquid ratio of the slurry. Important factors affecting the separation effect of the centrifuge. The separation factor is the ratio of the centrifugal force to the gravity of the material to be separated in the centrifugal force field, and it is related to the rotating speed of the drum and the diameter of the drum.
For some materials, the filter cake needs to be washed with a washing solution, and some even need to be washed multiple times to meet the requirements, which requires the configuration of a washing tube. The washing effect has a great influence on the washing time, washing speed, washing tube structure and the like.
The processing capacity of the centrifuge is related to the physical and chemical properties and separation requirements of the material, and is generally estimated by the number of cycles of one hour and the weight of the cake in a single run.