What is a pellet mill?
- The definition
A pellet mill (also called pellet machine, pellet press) is a type of mill or machine which is used to make pellets from powdered materials. A pellet mill is usually consisted of pellet die and rollers. The rotating rollers or the rotating dies force the feedstock trough the die holes to form pellets. (See the picture of how the pellets are produced by a pellet mill).
- The function of a pellet mill
Without any process, biomass from plants can be used to produce alternative fuel for fossil fuels. However the natural biomass with low densities, i.e. 80-150 kg/m3 for herbaceous and 150-200 kg/m3 for woody biomass, limits their application in energy production. Then the densification of these materials are needed to increase the bulk densities. Pelletizing is one of the methods to realize densification.