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The Importance of Pressure in Wood Pelletizing Process

The Importance of Pressure in Wood Pelletizing Process
The utilization of biomass pellets for heat and power production is becoming increasingly popular due to the desire to reduce carbon dioxide emissions into the atmosphere; Therefore, biomass pelletizing process and result are very important. Pressure is the key to optimize wood pelletizing efficiency and pellet quality.
Pressure has been investigated as a factor influencing the pellet density and durability as well as the energy consumption, and it has become the subject of various studies. Also, it has been theorized that high pressure has a high enthalpy, which is beneficial in a thermodynamic sense. The pressure that used in the pellet mill is usually applied in the areas where the pellet mill dies locate. Pellet mill pressure is an integral part during pelletizing process, and the quality of the pellets will be affected if the pressure is absent. The pressure determines the density, size, moisture content of the resultant pellets. Besides, pellet mill pressure is helpful to produce heat, which is used to bind the raw materials into the end products. The wood pellet mill pressure is also needed when it comes to adding the additives, which are used to make sure that the pellets being produced are firm and won’t unravel when used to produce energy. Pellet mill pressure is adjustable so as to accommodate the various raw materials that used to produce pellets.

wood pelletizing pressure

Factors Affecting the Pressure in Pellet Mill
There are many factors affecting the pressure in pellet mill, such as the raw material type, pellet length, temperature, moisture content and particle size.
It has been studied that the pelletizing pressure increases exponentially with the elongation of the pellet length. The rate of increase is dependent on biomass species, temperature, moisture content and particle size. Studies have been shown that increasing the temperature results in a decrease of the pelletizing pressure.
The effect of moisture content on the pelletizing pressure is dependent on the raw material species. Besides, different particle size fractions, from below 0.5 mm up to 2.8 mm diameter, are tested, and it is shown that the pelletizing pressure increases with the decrease of particle size.
Overall, the pressure in the pellet mill is of great benefit to the operators of pellet mills and is regarded as integral part in the functions of the pellet mill.