Dedusting Systems: Why They are Important for Pneumatic Conveying Systems
Dedusting is a process of removing fine impurities that can affect product quality, when materials such as pellets, powders, and granules are used. Fine impurities also minimise the efficiency of handling and processing systems used for such bulk solids and increase equipment wear and tear. A dedusting system plays an important role in cleaning these materials from such impurities.
Keep reading to get an overview of this system:
Kinds of Impurities
Dust is the most common kind of fine impurity. It can be generated from pneumatic conveying during processing. It becomes attached to granules or pellets and comes in the form of fines, streamers, and angle skins.
Other kinds of fine impurities are contaminants that come mixed with bulk granular materials before processing. They include paper, powders, fibres, and particles. These impurities are typical when recycling waste and extending the process to separate materials within the waste.
Pneumatic Conveying Dust and Causes
Because pneumatic systems are enclosed, very little dust is released into the air. But, the dust can get attached to the material itself. Fine impurities are created in pellet pneumatic conveying systems because of factors such as temperature, particle shape, and others. The major cause of impurities like streamers, angel hair, snake skins, and dust is friction from the pneumatic conveying of granules or pellets. These impurities can be made in bigger levels with dilute phase pneumatic conveying systems that have high air speeds and pipe elbows.
It is important to note that dust extraction and dedusting are not the same. Although dust extraction is used in some industries, it is often on a much smaller scale. Meanwhile, dedusting is more comprehensive and can be customised for different manufacturing and production needs. The system can effectively improve the performance of lean and dense phase pneumatic conveying systems that handle pellet and granular materials. It can be included as part of a new material handling and processing system installation or retrofitted to existing production environments.
Common System Composition
Dedusting systems usually have aspirators, piping, and cyclones. Airflow lets lightweight impurities to evacuate to dust cyclones and filter socks. The re-processed material goes to the aspirator’s bottom outlet. The system is connected with material handling and processing systems. Having the right system in place will reduce rejection rates, improve efficiency and product quality, as well as increase market and production value. When fine impurities are dedusted, residual dust won’t be able to make its way into other equipment.