When choosing a centrifuge, users should fully consider factors such as the usage scenario, temperature, and material characteristics of the centrifuge to achieve the expected usage effect. When selecting, the following aspects should be considered:
1. Corrosion resistance: The materials separated by the centrifuge generally have a certain degree of corrosiveness, and the materials in contact with the materials must meet the requirements of corrosion resistance to ensure the safe use of the centrifuge.
(1) The types of structural component materials include Q235. A, Q345. B, SUS304, SUS321, SUS316, SUS316L, titanium, Hastelloy, etc.
(2) Surface treatment methods include: lining with plastic, lining with glue, lining with PTFE, surface spraying with Halar, etc.
(3) Filter cloth (mesh) materials include canvas, polyester, polypropylene, imported composite polypropylene, sintered mesh, etc.
(4) Sealing materials include rubber, fluororubber, PTFE, etc. Users should inform us of the material properties (physical properties, chemical properties, separation temperature, etc.) when selecting, so that we can provide centrifuge selection suggestions based on the characteristics of the separated medium and clarify them in the order.
2. Explosion proof performance: If the materials (or environment) processed by the centrifuge contain flammable and explosive materials such as organic solvents, electrostatic sparks, etc., the centrifuge should have explosion-proof performance. The explosion-proof performance is determined by the explosion-proof requirements (level) of the process.
(1) Mechanical system: explosion-proof motor, explosion-proof lighting, anti-static transmission belt, anti-collision measures;
(2) Electronic control system: explosion-proof operation box, explosion-proof isolation barrier, non-contact energy consumption braking, electrostatic grounding;
(3) Attachment: Nitrogen protection device, oxygen content detector, etc. For occasions with explosion-proof requirements, users should specify the separated medium, explosion-proof requirements, and grade when ordering, so that we can configure corresponding devices and take appropriate measures to meet explosion-proof requirements.
3. Separation performance: It includes separation effect, washing effect, processing capacity, degree of automation, etc. When selecting orders, it is difficult to determine the final separation effect due to differences in material properties, mainly including viscosity, particle size and distribution, density, solid-liquid ratio, etc.
(1) The separation factor is an important factor affecting the separation efficiency of a centrifuge. It refers to the ratio of the centrifugal force to the gravitational force exerted on the separated material under the action of the centrifugal force field, and is related to the speed and diameter of the centrifuge drum.
Ft=ω 2r/g, where ω is the rotational angular velocity, measured in rad/s
R is the radius of the drum, measured in meters
G is the acceleration due to gravity, measured in m/s2
(2) For some materials, the filter cake still needs to be washed, and some even need to be washed multiple times to meet the requirements, which requires the installation of a washing tube. The washing effect is closely related to the washing time, washing speed, and washing tube structure.
(3) The processing capacity of a centrifuge is related to the physicochemical properties and separation requirements of the material, and is generally estimated based on the number of cycles per hour and the weight of the filter cake produced in a single operation.