Dense Phase
Vacuum Conveying - Dense Phase
Dense phase vacuum conveying systems use high capacity vacuum pumps (up to 99% vacuum) to convey materials from a feed hopper or silo to a receiving vessel or vacuum hopper where the air and product are separated by a filter.
Dense phase vacuum conveying systems use high capacity vacuum pumps (up to 99% vacuum) to convey materials from a feed hopper or silo to a receiving vessel or vacuum hopper where the air and product are separated by a filter.
When the vessel is full, the vacuum is isolated and the conveyed product is discharged into the destination silo. The product conveyed through the pipeline at a controlled low velocity, usually in a fluidized state to reduce friction and pressure drop.
Systems generally operate on a batch basis, as follows:
Valves and sensors are used throughout the process to control the applied vacuum, product fluidization settings and system velocities to ensure trouble-free product conveyance.
Dense phase vacuum conveying is particularly suitable for conveying high capacity materials over short to medium distances, from multiple sources to a single or multiple destinations. The low velocities and vacuum make it ideal for food, dairy and pharmaceutical applications involving friable or fragile agglomerates.
NB: All values are approximate: please contact GEA for advice about how to convey your product.
To optimize the system, various techniques can be used and additional options for specialized applications are available:
Dense phase pressure conveying systems use compressed air at above 1 Barg to push materials from a pressure vessel, sender unit or pressure pot through a pipeline to a destination where the air and product are separated.
Lean or dilute phase pressure conveying systems use positive displacement blowers —providing air at up to 1 Barg — to convey materials through a pipeline to a destination where the air and product are separated by a filter.
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.
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