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Lean, Medium, Dense-Phase Conveying

Lean Phase Conveying

When the product conveyed can greatly vary in particle size, shape or bulk density

In lean phase pneumatic conveying systems the solids are suspended in the conveying line air stream. The ratio of conveying product to conveying air is low: In most cases the operating pressure of the system is under one bar. Can be used well in both vacuum and pressure conveying.

Typical Products Conveyed

Ash, Sand, Silica, Limestone, Coal, Carbon, Cement, Kiln/Furnace Dust, Aggregates, Minerals, Metals and Gypsum, resins and compounds, specialty chemicals, ground feeds, and granular and pelletized products.
Lean phase conveying is well suited even if materials handled greatly vary in particle size, shape or bulk density. Flexible routing options and the ability to adjust flow requirements are key features of lean phase conveying.

Clyde Bergemann’s lean phase technology commonly utilize eXTreme , HD or Standard Duty Rotary Feeders that meter the amount of material being fed into the pipeline, while also isolating the environment above and below.

Options
  • High temperature valves up to 425°C continuous
  • Continuous or batch operation
  • Fully automated PLC system with SCADA compatibility
  • Variable speed/flow control
  • Non-sticky valve coating for sticky materials
  • Explosion proof options for combustibles
Features
  • Vacuum or pressure conveying options
  • Positive displacement pressure conveying less than 1.0 BarG
Benefits
  • Can be modified easily at a later stage to adapt to process / plant changes
  • Flexible pipe routing
  • Adjustable material flow control
  • Can handle materials of varying densities
Medium Phase Conveying

Suited to high capacity and long distance applications

The system uses medium pressure typically between 1.0 – 2.0 BarG and is capable of transporting materials at capacities above 240 tph down one pipeline over distances in excess of 1000 m.

Typical Products Conveyed

Bulk materials irrespective of how abrasive, fragile or difficult to handle they are, e. g. milled bottom ash, granular or crushed limestone and wood pellets.

Pressure Vessel Technology
Clyde Bergemann’s medium phase technology uses specialist pressure vessel technology that self regulates depending on the amount of material being fed into the pipeline, thereby avoiding uncontrolled discharge leading to pipe blockages. 
The system includes a variable position Dome Valve that is linked to a pressure transmitter installed in the conveying pipeline. PLC logic monitors the pipeline pressure against a predetermined set-point, ensuring that the loading is always optimized.

Options
  • High temperature valves up to 450°C
  • Continuous or semi-continuous operation
  • Valve open/closed monitoring back to PLC
  • Fully automated PLC system with SCADA compatibility
  • Non-stick valve coating for sticky materials
  • Pipeline blockage prevention system
Features
  • All pressure vessels incorporate the highly reliable Clyde Bergemann Dome Valve
  • Medium pressure system conveying at between 1.0 – 2.0 bar
  • Pressure vessels are factory assembled with all pneumatic piping pre-wired
  • Pipeline blockage prevention system
Benefits
  • Highly efficient mode of pneumatic conveying
  • Low overall energy consumption
  • Low operational expenditure
  • Low velocity material transport along pipeline
  • Can be modified easily at a later stage to adapt to process / plant changes
Dense Phase Conveying

For transporting fine or coarse materials

Dense-phase pneumatic conveying uses positive pressure to push material along a pipeline in a plug form at low velocities. 

Typical Products Conveyed

Application of dense-phase pneumatic conveying requires vast knowledge of the materials to be handled and their key characteristics such as particle size, shape, bulk density and chemical composition.  Typical materials conveyed are ash, limestone, granular coal, cement, sand, gypsum and many more.

Options
  • High temperature valves up to 450°C
  • Dense, medium and lean-phase combinations
  • Valve open/closed monitoring back to PLC
  • Fully automated PLC system with SCADA compatibility
  • Non-stick valve coating for sticky materials
Features
  • All pressure vessels incorporate the highly reliable Clyde Bergemann Dome Valve
  • High pressure system conveying at between 3.0 – 4.0 bar
  • Pressure vessels are factory assembled with all pneumatic piping pre-wired
  • Different vessels to match a variety of applications
Benefits
  • Significantly reduced pipe and component wear, promoting minimum operational expenditure (OPEX)
  • Extended life expectancy
  • Low energy consumption and high reliability
  • Longer, single stage conveying distances of up to 3000 m with transfer rates in excess of 100 tph