Today, wood pellet producers face two key challenges: high energy costs and growing demand for climate-friendly production methods. Efficient processes throughout the entire production line are now more important than ever. Fortunately, modern plant solutions prove that high performance and sustainability can go hand in hand. Companies can save energy, reduce costs, and increase production capacity by using the right technologies.
From by-product to energy source
Wood pellets are used to heat homes and large-scale plants, serve as a climate-friendly energy source in industry, and are even used as bedding in livestock farming. Compact pellets with high energy density are produced from sawdust, wood shavings, wood chips and other by-products of wood processing. This makes them easy to transport, store and dose. Furthermore, they offer consistent quality, whereas the quality of logs or wood chips often varies. Pelleting ensures that by-products are utilized effectively, creating a locally available, sustainable source of energy.
So, what is important when it comes to producing wood pellets in an energy- and cost-efficient way? The answer lies in efficiently coordinating all process steps, from grinding and drying to pelleting, cooling and subsequent storage.
In wood pelleting, the grinding process is the very first step and determines energy consumption. The pan grinder mill processes raw materials with moisture contents of up to 60% and prepares them optimally for further processing through its crushing and shearing action. Compared to a wet hammer mill, the pan grinder mill defibrates wood more uniformly because the fibers are broken transversely to their direction. While hammer mills produce needle-like, elongated structures, the pan grinder mill produces shorter fibers that are easier to process.
The advantage is clear: when producing domestic fuel pellets, the additional dry grinding process, which typically consumes up to 35 kWh per ton, can be eliminated.
Fabric belt drier: Making smart use of waste heat
There is also great potential in the drying process: through the use of waste heat. The fabric belt drier uses a heat recovery system with inlet air temperatures of less than 120 °C. Intelligent control technology monitors operating parameters in real time and adjusts them automatically. This ensures consistent drying quality, even when the input moisture content fluctuates. The result is wood shavings that are uniformly dried with a residual moisture content of 10 to 12 per cent, all with minimal energy consumption.
In addition, the close-meshed synthetic fabric belt filters the exhaust air and reduces the dust particles to less than half of the legal limits. This ensures compliance with strict environmental regulations and creates a clean working environment.
Pellet mill with Eco Roll: Lower energy consumption, higher performance
Another key factor in improving efficiency is pelletization. AMANDUS KAHL's patent-pending Eco Roll technology compacts the product in two steps instead of one. This distribution of the pressing force reduces energy consumption to around 40 to 45 kWh per ton. For an annual production of 50,000 tons, this equates to electricity savings of up to 1,250 MWh. At an electricity price of 20 cents per kWh, this translates to cost savings of approximately 250,000 euros. At the same time, production capacity increases by up to 25 per cent.
The Distamat system ensures consistently high quality. Integrated into the electronic pellet mill control system (EAPR), it maintains a constant gap between the pan grinder rollers and the die. Automatic measuring and control mechanisms continuously adjust the gap according to current process conditions, enabling stable, fully automatic control of the entire pelleting process.
This offers several advantages including reduced energy consumption, less wear, fewer periods of downtime, and consistent pellet quality.
Belt cooler: Gentle cooling ensures pellet quality
Pelleting is followed by cooling. The low-emission KAHL belt cooler gently reduces the temperature of the pellets to between 5 and 10°C above ambient temperature. This is made possible by a combination of low air speed, continuous conveying and a low layer height. These conditions protect the structure of the pellets, extending their shelf life while maintaining their quality.
Efficient wood pellet production line
Main machines of a wood pellet production line
Efficiency throughout the entire production line
h2] Efficiency throughout the entire production line
Every step of the wood pellet production process helps to reduce energy consumption: wet grinding in the pan grinder mill, using waste heat in the drier, two-stage compaction with the Eco Roll, and precise control via the EAPR and the Distamat. The gentle cooling provided by the belt cooler completes the cycle, resulting in a consistently efficient production line. With these machines, AMANDUS KAHL offers wood pellet producers an energy-efficient and cost-effective solution from a single source. This ensures coordinated processes, high availability, and quick access to servicing and spare parts. Users benefit from lower operating costs, stable and consistent product quality, and a clear contribution to resource conservation.
