Cyclonic separators have been used worldwide for more than 100 years and are also one of the most widely used industrial gas treatment plants. The main reason for the dramatic use of low cost cyclones is the lack of moving parts and high resistance to hard working conditions.
Gas containing particles is tangentially introduced from the upper part of the cyclone. Because of the geometric shape of the cyclone, the flow of gas will inevitably move downward with rotational motion.
Another type of cyclone (axial blade cyclone) is the axial input, with rotating blades embedded in it to create a rotating current. The particles are thrown outward by centrifugal force and inertia, and collapse down the device after collision with the walls of the cyclone.
The gas in the lower part of the cyclone moves in the direction of the image from the inner tube to the top. The refined gas is removed from the top of the cyclone and the particles are discharged from the bottom through a one-way valve or a spin valve.
Although the cyclones alone can not solve air pollution problems, these equipment play a very important role in controlling air pollution. Due to low initial cost and easy maintenance of these devices, they are often used as a precursor to more expensive devices such as fabric filters or electric filters.
In the past, cyclones were referred to as low-efficiency separation systems, although the separation efficiency was strongly dependent on the size of the particles and the type of cyclone design. During the last decade, the development of cyclones has greatly improved their performance.
Nowadays, cyclones are being marketed for a magnifying glass of 5 microns, with efficiency of more than 98%, or other types whose yields are about 90% to particles larger than 15 to 20 microns.