Centrifugal Fan and Its Application
A centrifugal fan is an air suction device that uses centrifugal force to extract or transfer air from an environment. Centrifugal fans are produced in various sizes and capacities, with the industrial type typically used for dust collector systems and dust removal processes.
In the air purification process, the goal is to:
Suction dust-polluted air from the workshop or factory
Transfer it to the dust collector
After passing through the filter bags and dust separation
Direct the clean air outside the factory
We see that in the dust collection or air purification process, the centrifugal fan plays an important and key role. Therefore, to select a suitable centrifugal fan for a dust collection process, we must extract parameters and options appropriate to the type of dust collection process.
Parameters for selecting a centrifugal fan device
• Air flow rate: Air flow rate, flow rate or volume of air suctioned by the fan per unit time, which is usually calculated in cubic meters per hour (m³/hr) or cubic feet per minute (CFM).
• Speed: This important parameter is the speed of the air carrying particles, which should be determined based on the type of pollutant, length of suction ducts, existing fittings and suction pressure. This parameter is usually specified in standard tables according to the type of pollutant, and the unit of speed is usually considered in meters per second (m/s) or feet per minute (fpm).
• Static pressure: Static pressure compensates for pressure drop caused by ducts and fittings to ensure proper dust suction and is measured in inches of water.
• Vacuum pressure: Vacuum pressure is the basis for proper operation of a dust collection system. This quantity indicates sufficient suction by the fan through ducts and dust collector and its unit is also (Inches of Water).
Types of centrifugal fans based on blade structure
Fans are classified based on the angle of the impeller blades and the direction of fan rotation:
• Backward fans (Backward): In this type of fan, the angle of the impeller blades is opposite to the direction of fan rotation. Backward fans are mainly used in dust collection processes where the duct length and system pressure drop are higher, and also where temperature and humidity are usually high.
• Forward fans (Forward): In this type of fan, the angle of the impeller blades is in the direction of fan rotation. In forward fans, the number of impeller blades is relatively large and their depth is small. After entering this type of fan, the air exits tangentially to the angle of the impeller blades according to the angle and structure of the impeller blades.
• Radial fans (Radial): This type of fan has blades perpendicular to the fan’s rotation axis. The structure of this type of fan blades enables them to be useful in high pressures and where there are large contaminant particles. This type of fan is used in industries where large metal particles or wood are among the contaminants.
This article briefly discussed the importance and application of centrifugal fans in filtration. However, designing and manufacturing this device is a specialized task and requires technical consultation and scientific calculations. For consultation, manufacturing and calculation of this device, please contact Zist Filter Company and complete the centrifugal fan purchase request form.
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