Project
Cement Plant Dotternhausen

At the premises of Holcim (Süddeutschland) GmbH, STAG has implemented several projects concerning pneumatic and mechanical conveying, silo and dosing systems for different bulk products such as cement, iron oxide, hydrated lime, iron(II) sulphate, furnace dust, granulated slag, paper ash and broken oil shale.

 

The use of roofing felt as alternative fuel resulted in a fascinating project. Trucks deliver the cut roofing felt as well as chips of tyres, wood and plastics, which are then automatically transferred and fed onto two dosing units and discharge conveyors by means of an overhead crane. A subsequent conveying belt serves for evacuating the roofing belt. 

Essential Information

Applied Main Components
•    Bicarbonate/hydrated lime silo including fluidisation system
•    Screw conveyors
•    Rotary vane feeders
•    Pneumatic dilute phase conveying with butterfly valve
•    Bicarbonate mill
•    Pressure conveying vessel
•    Conveying lines
•    Silo vehicle loading station
•    Mixing screw for moistening of residues
 

Particularities
•    Moistening of flue ash and residues
 

Client
•    Veolia Water System s.p.z.o.o.

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Technical Information
Performance Data
Systems Conveying rate Conveying distance
Hydrated lime dosing 20 - 200 kg/h 25 m
Bicarbonate dosing 5 - 100 kg/h -
Roofing felt dosing 0.5 - 7.0 t/h -
Iron-ll pressure conveying vessel transport to dosing unit 4.5 t/h bis 290 m
Iron(II) dosing (per dosing unit) 0.12 - 0.9 t/h -
Granulated slag pressure conveying vessel transport in intermediate silo 70 / 15 t/h 100 m
Oil shale transport to silo 120 t/h -
Oil shale dosing Charge into fluidised bed furnace 18 t/h -
Paper ash dosing 1.2 - 3.75 t/h 100 m
Systems
  • •    Hydrated lime and bicarbonate dosing
    •    Oil shale dosing incl. pneum. dilute phase conveying
    •    Alternative fuel dosing system (roofing felt/wood/plastic and tyre chips)
    •    Iron(II) sulphate pneum. pressure conveying vessel transport to silo
    •    Iron(II) sulphate dosing systems
    •    Pneumatic conveying system for flue ash transport (paper ash)
    •    Pneumatic conveying system for granulated slag transport
Bulk material
Bulk material Grain size Moisture content Bulk density Temperature Property
Granulated blast furnace slag 3700 Blain < 0.2 % 1.0 t/m³ 20 °C abrasive
Iron(II) sulphate 99.9 % < 1‘000 µm dry 0.8 t/m³ 20 °C not abrasive
Hydrated lime < 0.1 mm dry 0.42 t/m³ 20 °C not abrasive
Bicarbonate < 0.5 mm dry 0.8 - 1.3 t/m³ 20 °C not abrasive
Oil shale 0 - 12mm 4 - 7 % 1.25 t/m³ 20 °C not abrasive
Paper ash (flue ash) 100 % < 200 µm dry 0.4 t/m³ 20 °C abrasive
Roofing felt < 50 mm 5 – 10 % 0.4 - 0.8 t/m³ 20 °C Sticky under higher temperatures
Tyre chips 0 - 200 mm 5 – 10 % 0.45 t/m³ 20 °C abrasive
Wood chips 0 - 200 mm 5 – 10 % 0.3 t/m³ 20 °C abrasive
Plastic chips 0 - 200 mm 5 – 10 % 0.15 t/m³ 20 °C abrasive
Appropriate Topics
Gravimetric Dosing

STAG has gained an extensive experience with the gravimetric dosing system. The system contains the dosing, the pneumatic conveying with product-specific air blast injector nozzle as well as the necessary air treatment.

to the product
Injector and Air Blast Nozzle

Injector:

Injectors are used for the simple, self-regulating in-feed of powdered and granular bulk products into pneumatic conveying lines without moving parts.

 

to the product
Cement Plant Untervaz (HOL)

During their long-year partnership, Holcim (Schweiz) AG and STAG have already implemented most various conveying systems for bulk products all over Europe.

 

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