Biomass heating systems can be described by the type of feedstock it needs:
•Feedstock:
oLogs require very little processing other than being sawn to the correct dimensions and being kept dry, or ?seasoned?. Seasoning reduces the moisture content of the wood to about 20% by mass and can take up to three years. These are used in log stoves and boilers
oWood chips are typically derived from waste wood products, and due to the nature of delivering the feedstock to the fire chamber of the boiler, they are better suited to larger applications
oWood pellets undergo the greatest amount of processing of all the biomass products. Because of this pellets boast the advantage of having a very high and consistent energy content whilst having a low moisture content, as well as being more convenient to store, transport and burn
Types of heating system available include:
•Log stoves/boilers which burn logs directly
•Wood chip boilers which burn wood chips
•Pellet stoves/boilers burn wood pellets
•Multifuel stoves can burn a range of solid fuel types
•Ceramic stoves burn wood products and store heat in thermally massive ceramic tiles for release throughout the day
Other biomass technologies include gasification and pyrolysis, but these will not be presented here.
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