The use of solid biomass - in the form of wood chips, pellets, briquettes, firewood, sawmill residues, bark, or insect-killed trees - for fuel production is rapidly growing worldwide, with the global market for biomass pellets expected to nearly double from $4.5B in 2014 to $8.3B in 2020. Applications range from home heating, to greenhouses, schools, combined heat and power (CHP) plants, district heating stations and co-firing with coal in industrial power plants.