Pellets for fuel are commonly manufactured from wood residues created by timber harvesting and saw milling operations but they can also be made from industrial waste, food waste, agricultural residues and energy crops.
Pellets are made by passing organic material through a hammer mill to create a dough-like mass. The mass is then pressed and squeezed through a die with holes usually 6 millimetres in diameter. The mass’s temperature increases greatly under pressure causing the lignin from the residues to plasticise and create a natural glue to hold the pellet together.
Pellets are extremely dense and have very high combustion efficiency when produced with low moisture content.
Wood pellets are an ideal fuel source for domestic and industrial heating.