These are used to reduce wood fuel material to small pieces for
easier handling, volume reduction, or as a feed for conversion
processes.
Shredders and grinders are designed for low grade hogfuel
production. Hogfuel is unlikely to be suitable for most small and
medium sized wood fuel systems, which generally use even-sized high
quality wood chip. However, use of a screen can help to remove
oversize pieces.
Shredders, grinders and hammermills can be high power, high
throughput units, suitable for handling low quality, mixed
material, particularly if it might be contaminated with stones or
soil.
Shredder
Has one or more rotating axles with teeth that tear apart wood
material through a screen.
Stump grinder
Consist of a fast rotating tool which can pivot around an axle
when too much resistance is met. Grinders are used to grind down
large tree stumps such as during land clearance operations.
Hammermill
Material is forced through holes in a screen using hammers.
Hammermills can be used to reduce woody biomass to small pieces
prior to forming pellets.
Tub grinder
A general purpose grinder for use on a wide range of waste,
including construction and demolition waste.