What is low pressure drop cyclones and why is it called ?as you find mostly drafts (Negative Pr )in cyclones and not pressure(PositivePr) in cyclones.So they should be called as low draft cyclones.
technical cement forms
Low Pressure Drop Cyclones
Raj Sahu
Low pressure drop cyclone have pressure drop across cyclone is around 50 mmwg.High pressure drop cyclone have pressure drop around 75mmwg across cyclone.Generally low pressure drop cyclone have larger diameter then the high pressure
drop cyclone.In preheater all pressure should be in negative only.
Regards,
R.M.Sahu,
India
Michael Clark
Draft is negative pressure. There is a change in pressure across a cyclone and that change in pressure is referred to as the pressure drop, i.e. there is a more negative pressure at the outlet than the inlet. In a cement kiln negative pressure must be maintained on the rotary section of the kiln. This is achieved by the induced draft fan. The higher the pressure drop across the preheater (each of the cyclones) the bigger must that fan be to maintain negative pressure in the kiln. So low pressure drop cyclones allow a smaller fan to be used for drafting the kiln, or allow additional clinker production with an existing fan.
madhu
In pyroprocessing the pressure drop will always be negative, the pressure drop depends upon the model of the cyclones. The LPD cyclones have low pressure compared to conventional pre heater cyclones.Due to the low pressure drop margin will be created in pre heater fan/id fan for higher production. Moreover cyclone efficiency will be increase and dust collection will be improved.
Further can save electrical energy and save thermal energy min. of 4.0 Kcal/ kg of clinker.