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BrochureDense Phase Vacuum Conveying Systems
Theory
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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 (also known as a Vacuum Hopper) where the air and product are separated by a filter. When this vessel is full, the vacuum is isolated and the conveyed product discharged into the destination silo. The product conveys through the pipeline at a controlled low velocity, usually in a fluidised state to reduce friction and pressure drop.
Systems generally operate on a batch basis as follows: (simplified)
- The vacuum pump sucks powder to the Vacuum Hopper until full.
- The vacuum isolation valve closes and the discharge valve opens.
- Conveyed powder is emptied from the Vacuum Hopper.
- The discharge valve is closed and the cycle repeats.
Valves and sensors are used throughout the system to control the applied vacuum and product fluidisation settings and velocities at all parts of the system to ensure smooth reliable conveying of the product.
Applications
Dense Phase Vacuum Conveying Systems are particularly suitable for systems, which convey materials at high capacities over short to medium distances, from multiple sources to a single or multiple destinations.
The low convey velocities and vacuum method make it particularly suitable for Food, Dairy and Pharmaceutical applications with friable or fragile agglomerated powders.
Specifications
| Convey Rates: | Medium, up to 20 tonnes/hr (higher with multiple vessels) |
| Convey Velocities: | Low, 0.5-8 m/s |
| Convey Distances: | Medium, up to 100m (longer with push-pull systems) |
| Air Mover: | Vacuum Pump (Dry Vane, Oil or Water Sealed) |
| Operating Pressure: | Up to 99% Vacuum |
| Material/Air Ratios: | Medium, up to 50 kg/kg |
| Note All values approximate, refer Nu-Con for advice about how to convey your product. | |
Options
To optimise the system various techniques are used to enhance operation, and additional options for specialised applications are available:
- Feedback Velocity control systems to minimise product degradation
- Pulsed air injection to break up the product flow into discrete slugs
- In-Line sifting, sampling, delumping, metal detection and magnetic separation systems
- Line Boosters to assist conveying along convey route
- Automatic unblocking systems using compressed air injection
- Vibration to loosen cohesive powders prior to conveying
- Twin vessels to provide continuous conveying
- Stainless Steel construction for sanitation or corrosion resistance
- Demountable and polished designs to USDA 3A standards for ease of cleaning
- Multiple inlet / multiple outlet convey networks for maximum flexibility
- And more ...