Lean (Dilute) Vacuum Conveying - Lean Phase

Lean or dilute phase vacuum conveying systems generally use positive displacement exhausters to provide a vacuum (up to 50%) to convey materials through a pipeline to receiving vessel where the air and product are filtered and separated. Lower capacity fan-based systems are also available.

Product enters the pipeline directly or via a feeding device (rotary valve or screw feeder) if metering is required, is suspended in the airflow and is conveyed at relatively high velocities depending on particle size and density. The conveyed product is discharged from the receiving vessel on a continuous basis by a rotary airlock or intermittently by valves.Lean or dilute phase vacuum conveying systems generally use positive displacement exhausters to provide a vacuum (up to 50%) to convey materials through a pipeline to receiving vessel where the air and product are filtered and separated. Lower capacity fan-based systems are also available.

Applications

Lean phase vacuum systems are particularly suitable for conveying low to moderate capacity materials over medium distances, from multiple points to a single destination. They are versatile and adaptable, and their low operating pressures allow less expensive pipelines and fittings to be used. This method is frequently used for central vacuum cleaning systems or to draw product from multiple silos and other applications that require a reticulated network of vacuum pipes to convey product to a single collection point.
 

Specifications

Convey Rates:            low to medium (<10 tonnes/h).
Convey Velocities:      15–30 m/s
Convey Distances:     <100 m
Air mover:                 Positive displacement (Roots Type) exhauster or fan.
Operating Pressure:    <50% vacuum.
Material Air Ratios:     low to medium (3–15 kg/kg).

NB: All values are approximate: please contact GEA for advice about how to convey your product.