Pellet mill, also known as pellet press, pellet machine, or pelletizer, is utilized to make crushed biomass materials, such as waste wood, shavings, sawdust, straw, peanut shell, palm fiber, etc. into densified cylindrical pellets to be used as fuel for heating, cooking or other purposes. Based on different capacities and working principles, biomass pellet mills are divided into small pellet mill (flat die pellet mill, 80-800kg/h) and large pellet mill (ring die pellet mill, 1.2-2T/H).