Pneumatic Powder and Solids - Transport Systems

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Some common solids as flour, sugar, cement and many more, can be suspended and transported in air - referred as pneumatic conveying. A pneumatic conveying system may transport solids up to approximately 50 mm size. The powder or solid must be dry, with no more than 20% moisture and not sticking.

In a pneumatic conveying system, most of the energy is used for the transport of the air itself. The energy efficiency of a pneumatic conveying plant is therefore relatively low, but this is often outweighed by easy handling and, in well designed systems, dust free solutions.

In general the length of a pneumatic system should not extend 300 m for each pneumatic unit. The products can be conveyed over long distances by connecting the systems in series.

There are three basic designs of pneumatic transport systems:

• dilute phase conveying at a high gas speeds (20 - 30 m/s)
• strand conveying at a limited gas speeds (15 - 20 m/s)
• dense phase conveying at a low gas speeds (5 - 10 m/s)

Pneumatic systems can operate with both positive and negative pressures - vacuum. The working pressure should not extend 40 kN/m².

The maximum temperature rise during pneumatic compression is seldom above 5^oC, which makes pneumatic transport systems suitable to sensitive products as medicines, food or similar.

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Related Documents

• Pneumatic Transport Fundamentals - A fundamental introduction for pneumatic transport of powders
• Pneumatics - Solid Transport Carrying Velocities - Air carrying velocities for solid transport of products as cement, coal, flour and more
• Pneumatics - Solid Transports and Particle Sizes - Typical particle sizes for common products as coal, sand, ash and more
• Pneumatics - Solid Transports and Separator Types - Separator types used in pneumatic solids transport systems - and their minimum suitable particle size