Vacuum Conveying:
The Principle
Examples of Conveyed
Materials
Vacuum Conveying:
Cost Example

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Energy Costs for Vacuum Conveying - Example

Conveying task: Conveying of Lactose powder
Total conveying length: 5 m
Conveying height: 2.5 m
density: 0.73 kg/l
particle size: 5 – 500 µm
material property: dry, good flowability
suction out of loading hopper

Vacuum Conveyor: PPC170 with Multijector Vacuumpump M 540 GLA KV
operating pressure: 5.5 bar compressed air
suction: 4 seconds (=44.44% of cycle)
unloading : 5 seconds (=55.56% of cycle)

Conveying capacity at trial: 1.600 kg/h

Energy consumption:
1. Multijector Vacuum pump M 540 (consumption only during suction cycle)
516 Nl/min and 44 % of the cycle = 229 Nl/min = 13.76 Nm³/h
2. GLA – filer cleaning (0,75 Liter*5,5bar) every 9 seconds = 1.65 Nm³/h
3. KV – pneumatic piston vibratgor (during discharge cycle ) 40 Nl/min and 55.56 % of the cycle
= 1.33 Nm³/h
Complete Compressed-Air Consumption: 16.74 Nm³/h
Cost of Compressed-air: ca. 0.02 EUR/Nm³ * 16.74 Nm³/h = 0.335 EUR/h

For this application with a conveying capacity of 1600 kg/h the energy costs are 0.335 EUR/h, or 0.209 EUR per ton material transported.

Note: A comparable electrical pump for the vacuum Conveyor would be 2 kW size and would operate both during suction and discharge cycle. However, compressed air would still be needed for the filter air-shock and the piston vibrator.