Wood chips

Stem Wood Chips (p63/p45)

Main fraction: P63
Ash Content, % ≤2%
Bark Content, % ≤10%
Moisture, % 30-45%
Species: All species
  • FSC 100% or FSC controlled wood for all trades
  • MDF P45

    Main fraction: P45
    Ash Content, % ≤1%
    Bark Content, % ≤5%
    Moisture, % 35-55%
    Species: All species
  • FSC 100% or FSC controlled wood for all trades
  • Logging residues wood chips

    Main fraction: P63
    Ash Content, % ≤6%
    Bark Content, % ≤20%
    Moisture, % 35-55%
    Species: All species
  • FSC 100% or FSC controlled wood for all trades
  • Pressed Wood Chips

    Main fraction: P63/P45
    Ash Content, % ≤2%
    Bark Content, % ≤10%
    Moisture, % 30-45%
    Species: All species
  • FSC 100% or FSC controlled wood for all trades
  • Wood chips are climate-friendly, domestic and cost-efficient fuel for heat and power production. They are especially well-suited for objects with a high heat requirement and sufficient space for storage.

    „Forest wood chips“ are generated as by-product of timber harvesting of small-diameter timber and inferior wood like branches or treetop material. When wood is processed in a sawmill the chopped pieces are called „industrial wood chips“. Another origin is short rotation coppice on fallow agricultural land where the wood chips are made of fast-growing tree species.

    Standardization – Playing by Rules
    Standardization can be a reliable foundation for business negotiations and contracts. Abidance by said rules, however, is optional. The EN ISO 17225 Standard defines quality-related fuel categories and specifications for solid biomass fuel worldwide. With C 4005 a particular series of regulations was published in Austria for energy recovery of wood chips and hog fuel in biomass plants over 500 kW. Instead of 28 subcategories, it distinguishes only between the four resource groups C1 (logs), C2 (whole trees), C3 (forest residue) and C4 (bark, stumps, roots).

    Size and Qualities Depending on size, wood chips are distinguished between fine, medium sized and coarse wood chips. With the EN ISO 17255 series the designations G30, G50 and G100 were replaced by the particle sizes P 16, P31/P45 and P 63. They indicate that the length of the main fraction is ≤16 mm, ≤31 mm/≤45 mm or ≤63 mm. Furthermore, there are four classes referring to quality: A1, A2, B1 and B2. Fine wood chips are most suitable for smaller plants, although oversized pieces and a high percentage of fines (dust) may affect the plant. Industrial wood chips usually correlate with the medium size P31/P45. Coarse wood chips are mostly used in large-scale plants.

    Combined Heat and Power (CHP) Wood chips are suitable for cogeneration.
    In contrast to hydro, wind or solar energy, biomass CHP plants do not depend on the season or weather. Different technologies are applied: In a Stirling engine, for example in micro-CHP systems for households, thermal energy can be directly converted into motion and electricity. For an average or higher performance, steam is produced by wood combustion and then converted into electricity by a turbine or an engine. In the ORC, water is replaced by an organic medium, which allows for power generation at relatively low temperatures. During the wood gasification, wood is converted into a producer gas that is then used in a gas engine. High efficiency rates of about 30 % are possible; including waste heat, an efficiency of up to 80 % can be reached. The quality requirements for the wood chips are high.