Dense Phase Powder Conveying

Dense phase powder conveying systems are categorised into three (3) groups:
 - Fluidised conveying
 - Fluidised conveying with internal by-pass
 - Slug conveying with external by-pass (secondary air supply)

Fluidised conveying with or without inner by-pass is suitable for fine powders with medium to high fluidising properties. The following characteristics are distinct for fluidised conveying:
 - Continuous to surging homogeneous phase
 - Low to medium terminal velocity (8~20 m/s)
 - High solid to air ratio
 - Low to high pressure drop

Slug conveying with external by-pass line is required if a powder is to be conveyed slowly and gently, but its properties do not allow fluidised conveying.

Slug conveying with external by-pass lines also provide wear protection when conveying  very abrasive bulk solids.