Pneumatic filling of silos

Most bulk solids are supplied by silo truck or railcar and have to be unloaded at the customer’s site into a storage silo. In most cases the conveying into the silo is made pneumatically. The following systems are available: 

 
solids truck discharger

Features:

• The compressed air for conveying is generated by the compressor unit on board of the truck.
• The vessel of the silo truck or railcar constitutes the pressure vessel.

 
Used for standard applications, i.e.:

• No special requirements to the conveying quality
• Pipe length (horizontal + vertical)  < 50 meters

 
Typical unloading capacities up to:

• 16 m³/h at a conveying pipe of DN 80
• 28m³/h at a conveying pipe of DN 100

Larger pipe diameters are not reasonable as usually the capacity of the on-board compressors is not sufficient. 

System components:

• local opeartion cabinet
• truck coupling with limit switch
• shut-off valve in the conveying pipe
• conveying pipe system
• level probes  for high and low level
• safety devices for vacuum and overpressure
• dedusting filter

solids Puls-Pneu-Truckdischarger

Features:

• The compressed air supplied by the truck’s on-board system is supported by compressed air from the plant net (high conveying capacity) or completely substituted (for gentle unloading without segregation).
• The vessel of the silo truck or the railcar constitutes the pressure vessel

Application:

• conveying without segregation is required (e.g. for premixes or final products)
• particle degradation has to be minimized (e.g. for sodium percarbonate, structured sand)
• for very high unloading capacities up to 115 m³/h
• for very long conveying distances up to 300 m
• if no on-board compressor is available (e.g. at railcars)

 
The PULSE-PNEU truck discharger consists of the basic components of the solids truck discharger extended by:

• the air supply for silo truck or railcar for a controlled feed of the air,
• the impulse valve to generate material plugs and intermediate air cushions
• the relay stations with bypass system to avoid clogging and to ensure a gentle conveying without segregation
• increase of pipe diameter along the conveying run for an extremely gentle conveying without segregation