In 2009, Liebherr-Werke Nenzing GmbH invited STAG to develop and produce a customised solution for pneu-matic disposal of a lime/cement mixture into the drill ground. Based of its extensive experience in the field of pneumatic conveying, STAG engineered, built and successfully commissioned the conveying plant. The ‘’mobile“ conveying plant, including the control system, has been mounted onto a ramming and drilling equipment.
Feeding of the two pressure vessels is ensured by applying the pneumatic method from the extern silo vehicle. The bulk material quantity is determined in each pressure vessel and then discharged via a subsequent rotary vane feeder into the conveying flow, which then feeds the bulk material pneumatically into the “drill head” and the drill ground via a conveying line.
Applied Main Components
• Pressure vessel with integrated weighing system
• Compressor with refrigeration dryer
• Membrane filter
• Exhaust air filter
• Blow-off locks
• Pressure silo container with conveying system mounted to the ramming and drilling unit for ground stabilisation purpose
• The plant is preinstalled on a base frame as mobile compact unit.
• Liebherr Nenzing, special machines
|Systems||Conveying rate||Conveying distance|
|Pneumatic cement conveying||2.4 – 7.2 t/h||20 - 25 m|
- Pressure vessel
- Integrated weighing system
- Dosing system
- Compressed air system
- Filter system
|Bulk Material||Grain size||Moisture content||Bulk density||Temperature||Property|
|Cement/lime mix||-||trocken||1.1 kg/dm³||<80 °C||not abrasive|
The pressure conveying vessel is used by STAG when it comes to challenging tasks, high conveying rates and long con-veying distances. This pneumatic conveying application using the dense flow method combines energy-optimised conveying processes with perfect operational safety.
Designed for crushing lumps as well as agglomerated material within the bulk material.
In lump breaker applications, the oversize grain is prepared for subsequent pneumatic or mechanical conveying or ensiling procedures.
Discharge chain conveyors are installed at bunker outlet points or directly in boiler hoppers. The dimensioning and construction of the large inlet opening require detailed knowledge.