Virgin Wood Biomass
Virgin wood chips are produced from forestry and sawmill activities. Softwood material usually comprises of wood from fast-growing plantation coniferous trees and normally has a relatively high moisture content of over 50%. Softwood chips are supplied in a series of sizes; G30, G50 and G100; to suit the facility they will be used in.
Virgin hardwood chips are produced from forestry and sawmill activities. Hardwood material is made of wood from oak, beech, sycamore etc. and generally has a slightly lower moisture content than softwood chips. Hardwood chips are supplied in a series of sizes; G30, G50 and G100; to suit the facility they will be used in.
Pelletised Wood Fibre
Pelletised fibre is wood that is processed to produce a fuel that has a higher calorific value, lower moisture content and greater density than raw chipped wood; enhancing heat and production. Whilst pellets cost more to produce, the end product is easier to handle and can be bagged for retail consumers.
G30, G50, G100
Hardwood and softwood chips are supplied in a series of sizes; G30, G50 and G100. Various different biomass boilers will best suit specific fuel chip types and sizes; typically small domestic boilers use the G30 chip which has a maximum surface area of 3cm2, whereas G50 are 5cm2 and G100 10cm2 – with a maximum particle length of 8.5cm, 12cm and 25cm respectively. The largest size of woodchips will normally be burned in commercial boilers and utility power plants.
Arboricultural Chip is produced from countryside and urban management, scrub clearance, pruning and tree surgery. Arb chip is mixed grade material that will contain twigs and branch wood as well as dense, high calorific value trunk wood.
Forestry Brash is the residual material generated during the management and harvesting of forests. These off-cuts, ‘lop’ and ‘top’ were traditionally left to decompose, but make a ready source of biomass ideal for larger industrial furnaces.
The production of modern peat-free compost and mulches uses bark, twigs, roots and kerbside green waste as a raw material. Co-products generated during the composting process form a cost-effective biomass fuel.
Pin chips are the mid-fraction of hardwood and softwood residues that have been screened to produce a smaller chip suitable for small-scale installations.