Fuel pellets from biomass: The importance of the pelletizing pressure and its dependency on the processing conditions

► The pelletizing pressure is an important parameter in biomass pelletization processes. ► The pressure has to be kept in a range where high quality pellets are produced, at a minimal energy input. ► Major parameters affecting this pressure were pellet length, temperature, moisture content and particle size distribution. ► Pelletizing pressure and pellet length are exponentially correlated. ► At elevated temperatures extractives migrate to the pellet surface, reducing friction in the pellet mill press channels.