Cyclone

Cyclone dust collector is usually used before the bag dust collector when the dust load of the air entering the bag filters exceeds their capacity. The cyclone is used to reduce the dust load and is used to absorb particles whose dimensions are at least 20 microns, and smaller particles are usually removed with the air exiting the cyclone.
Under normal conditions, the efficiency of cyclones is about 85%, which depends on various conditions, including the amount and dimensions of suspended particles, air velocity, and the dimensions and design of the cyclone.
In cases where the volume of air to be cleaned is high, several cyclones are used in parallel to increase the flow rate of air passing through the dust collector without causing a large pressure drop.
The pressure drop in these devices is about 80 to 150 mm of water, which depends on the type of cyclone and the speed of cleaning in the cyclone cross-section.
The cross-sectional velocity of the filter (the vertical component of the air flow) is usually selected between 2 and 4.5 meters per second. Increasing this component is associated with increased efficiency and greater pressure drop. The air flow velocity inside the cyclone, which is assumed to be equal to its inlet velocity, is usually selected between 20 and 25 meters per second. Increasing this velocity to more than 30 meters per second or decreasing it to less than 15 meters per second causes a significant drop in efficiency.