What is difference between lean phase and Dense phase pneumatic conveying system?

Question

Accepted Answer

Lean phase and dense phase pneumatic conveying systems differ in terms of air-to-material ratio, conveying velocity, and material degradation.

Lean phase pneumatic conveying system uses a high air-to-material ratio, while dense phase system uses a low air-to-material ratio.
In lean phase system, the material is conveyed at high velocity, whereas in dense phase system, the material is conveyed at low velocity.
Lean phase system is suitable for conveying light and non-abrasive materials, while dense phase system is suitable for conveying heavy and abrasive materials.
Lean phase system may cause more material degradation due to higher velocity, while dense phase system minimizes material degradation.
Example: Lean phase system is commonly used for conveying plastic pellets, while dense phase system is used for conveying cement or coal.

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