In order to meet the heat demand of Schweizer Zucker AG at its Aarberg site in Switzerland, a biomass power plant has been constructed at the same location. Martin GmbH was charged to build the wood-fired power plant.
In different zones of the steam boiler and the two cyclones, flue ash is generated, which is discharged by means of mechanical conveyors and fed, following its reduction in size, into an ash silo via pressure conveying vessel transport.
STAG installed the standardised combination of mechanical conveying by means of a trough chain conveyor, processing using an impact mill and subsequent pneumatic conveying via pressure conveying vessels.
Applied main components
• Rotary vane feeders
• Collector hopper
• Pressure conveying vessel
• Trough chain conveyor
• Impact mill
• Double pendulum flaps
• Screw trough conveyor
Particularities
• Bulk material handling in a wood-fired power plant
Client
• Martin GmbH für Umwelt- und Energietechnik
| Systems | Conveying rate | Conveying distance |
|---|---|---|
| Mechanical boiler discharge 2./3. pass | 0.9 – 2.5 t/h | - |
| Mechanical boiler discharge 4. pass | 1.9 – 2.8 t/h | 17 m |
| Mechanical cyclone discharge | 0.3 t/h | - |
| Pneumatic conveying pressure conveying vessel | 1.9 – 2.8 t/h | 65 m |
- Mechanical/pneumatic boiler and cyclone ash removal
| Bulk material | Grain size | Moisture content | Bulk density | Temperature | Property |
|---|---|---|---|---|---|
| Boiler ash 2./3. pass | 0-100x100x250mm | < 1 % | 0.35–1.0 t/m3 | 450 °C | abrasive |
| Boiler ash horizontal train | <10 mm | < 1 % | 0.4–0.6 t/m3 | 200 °C – 450°C | abrasive |
The impact mill has been specially designed for breaking up agglomerated material within the bulk product. This application is mainly used in the treatment of boiler ash originating from incineration plants.
The double-sided sealing turn slide valve has been especially designed for pneumatic conveying as part of the STAG pressure conveying vessel technology. No other system can satisfy the high demands of this application.
Each year, around 100 service assignments are carried out by STAG. From small inspections up to several-weeks of a total plant revision, our customers have Projektmanager, audit managers and audit teams at their disposal. The life-cycle-oriented service backup serves as the basis. This includes t