Biomass Fuel Boiler fuel – direct firing with wood Co-fire with coal Wood pellets Gasification with pyrolysis Torrefaction – still in development Cellulosic ethanol – still in development Gasification with plasma – still in development
Forest Residues Small trees, limbs and tops are reduced with a drum chipper or grinder depending on the operation Grinders are needed if the material is too contaminated for a chipper Grinders can use carbide bits for contaminated material or sharp bits for clean material
Industrial Mill Residues Bark, chip rejects, sawdust, slabs and end-cuts, shavings, rejected lumber Clean sawdust often has a higher value as pellet fuel than boiler fuel Bark may also have a higher value as landscape cover More mills are selling these higher value products and using lower value forest residues for boiler fuel
Urban Wood Residues Wood pallets, wood crates, furniture, cabinets, yard and tree trimmings C&D materials are often taken to a recycling center for separation The wood separation is reduced for fuel with a grinder
Direct Combustion Used for combustion of solid fuel Pile systems Suspension Combustion Systems Fluidized bed combustion Systems
Wood Pellets Standard grades are used in large industrial boilers or coal plants and can contain ash Premium grades need to be low ash which means debarked wood Premium pellets are mostly bagged and sold through retailers Pellet feedstock typically comes from sawdust however with increased demand pulpwood logs are being used
Gasification Thermo chemical gasification uses heat to decompose the woody feedstock under oxygen-limiting conditions Gasification removes ash including most alkali metals The gaseous form has a wider range of energy applications vs. solid fuel
Your consent to our cookies if you continue to use this website.