Wood Pellet Porcess

The process involves several key stages: preparing the raw material, drying it, grinding it into a fine powder, and then compressing this powder under high pressure to form pellets.

Key Technical Factors

• Moisture Content: Too much or too little moisture can negatively affect the process. Optimum levels are typically between 8-15%.
• Temperature: The high temperatures generated during pelletizing are essential for melting the lignin, which acts as the natural binder.
• Pressure: High pressure is needed to overcome the material's resistance and achieve the required density.
• Raw Material: Different wood species behave differently. For example, beech requires more energy to pelletize than pine but produces stronger pellets.
• Quality Standards: The industry has strict quality standards. The ENplus certification is a leading global standard for wood pellets. For example, the highest grade, ENplus A1, permits a maximum ash content of only 0.7% and requires a mechanical durability of ≥ 98.0%.

Advanced Technologies

• Torrefaction: A thermal pretreatment process where biomass is heated to 200-300°C in a low-oxygen environment. This "roasts" the wood, producing a more energy-dense, hydrophobic (water-repellent) fuel that behaves more like coal.
• High Moisture Pelleting (HMP): This technology allows for the pelletizing of biomass with higher moisture content, reducing or eliminating the need for energy-intensive drying.
• AI and Automation: Artificial intelligence is being integrated with near-infrared (NIR) technology to sort biomass more efficiently. Advanced control systems are also being used to optimize the pelleting process and reduce energy consumption.