Biomass
Wood chip and pellet screw conveyors for biomass
Biomass is our oldest field of application — and the one where the shaftless spiral shows its strengths most directly.
Hog fuel is not a uniform material. Depending on chipper quality, species of wood and drying, particle size, moisture and bulk density vary considerably — and with them the behaviour inside the conveyor. Oversized pieces, bark content and forked branches are the norm, not the exception.
That is exactly where screws with a centre shaft fail: whatever can wrap around an axle eventually does. The shaftless spiral offers no such axle. The cross-section stays clear and oversized pieces pass through.
For pellets a different argument counts: gentle handling. Every bit of abrasion is lost product and creates dust that later causes trouble in the boiler. The spiral pulls and pushes the material rather than cutting it.
Because the same spiral works horizontally, on an incline and vertically, intake and lift can be built as a single line — up to 28 metres of lift without a transfer station.
Typical materials — and what makes them difficult
- Hog fuel G30 to G50oversized pieces and forked branches in the flow
- Pelletsabrasion means lost product and dust in the boiler
- Bark and sawdustfibrous, tends to bridge
- Moist hog fuelbulk density and flow behaviour vary widely
Tasks we solve here
Bunker fillingMaterial taken from the intake hopper and conveyed vertically into the bunker — up to 28 metres with no transfer station.
Silo fillingFilling silos via horizontal intake and a vertical conveyor — in service in plants over 20 metres high.
Moving floor dischargeTaken from the hydraulic moving floor across the full width of the store and passed on to the downstream system.
Pellet screw and pellet conveyorMoving finished pellets from the store or big bag to the boiler — and, in a pellet mill, conveying within production itself.
Chipper dischargeTaken straight from the chipper and moved on evenly — replacing energy-hungry extraction.
Container fillingFilling and distributing into drying and storage containers, including with moving floor discharge.
Screening solutionsScreen out the fine fraction within the conveying line instead of buying pre-screened material at a premium.
Biomass system plantsComplete feeding from store to boiler, planned as one continuous system.
Häufige Fragen
How high can hog fuel be conveyed vertically?
We have built vertical conveyors with up to 28 metres of lift — with one continuous shaftless spiral and no transfer station between the horizontal and the vertical section.
Does a screw conveyor block on oversized pieces in hog fuel?
A screw with a centre shaft can block on oversized pieces and forked branches because the material wraps around the shaft. The shaftless spiral has no centre shaft, so the cross-section stays clear. Item lengths of up to roughly 400 mm can be conveyed depending on the size built.
Can the intake be driven over by a tractor?
Yes. On request we build recessed intake troughs with heavy-duty gratings that take vehicles with axle loads of up to 10 tonnes.
Your task in biomass?
Describe your material and your route — we normally reply within one working day.