During manufacturing of any item there are activities like conveying,transferring,mixing etc. in which lot of dust generates which needs to be collected. When any dust collection system is designed three things to be taken care.
Dust Collection System
1. Capture the dust with proper capture velocity and correct hood design. With this we calculate capacity of the system. Any over design increases fixed cost as well as operation cost due to more power consumption. Undersize will not give desired result.
2. Convey the dust with proper duct velocity. If velocity is less then the required material will settle in the duct and the duct get choked which reduces the suction capacity, Duct size becomes bigger and cost will be more. If velocity is more, then duct size is small which increases pressure drop in turn power consumption is more.
Dust Collection :
Dust collection can be in the dry form or wet form. Hence selection of proper equipment is very important which is based on dust load, particle size analysis, properties of dust & temperature. Based on the above data system can be only with Bag Filter or Venturi Scrubber. If dust load is very high then Cyclone Separator can be used as preliminary separator.
With Cyclone Separator we can achieve 80% to 85% efficiency down to 20micron
With Pulse Jet Bag Filter efficiency can be more than 99% down to 2micron