Magnetic separation + crushing + dust removal

Wood waste—such as wood chips, shavings, and sawdust—is loaded into a 10 m³ feed hopper and transported via conveyor belt to the wood hammer mill. An iron remover is installed on the conveyor belt to capture metallic impurities.

The hammer mill reduces the material to a uniform particle size (3–5 mm). The pulverizing process is equipped with a cyclone separator and a pulse-jet bag filter to collect generated dust, thereby improving the workshop environment and meeting environmental protection standards.

Drying (moisture content reduced from 45% to 8%）

The moisture content of the customer’s raw materials is about 45%. The moisture content is high, so it cannot be directly pelleted and is not conducive to storage. Therefore, we equipped our customers with a wood drying machine that can accurately control the moisture content of raw materials.

The crushed wet materials enter the dryer and exchange heat with the hot air in countercurrent flow, and the moisture content is quickly reduced to 8%. The discharge is equipped with a cyclone dust collector to collect fine dust in the drying exhaust gas, and the exhaust gas meets the emission standards.

The client selected a biomass furnace as the heat source; this allows for the use of self-produced biomass fuel—such as scraps and pellets—thereby reducing operating costs. A flame arrester is included to ensure fire and explosion safety in the drying section.

Dried Sawdust Storage

After the drying stage, a large-capacity (40 m³) dry powder storage silo is installed to store the dried sawdust that meets quality standards. The drying system can operate continuously to build up a stock of dry sawdust. Storing the sawdust in the silo helps stabilize its moisture content, preventing fluctuations that could otherwise compromise the quality of the formed pellets.

Pelletizing

The pelletizing section utilizes two wood pellet machines operating in parallel. This configuration reduces the load on individual units and facilitates maintenance; if one machine undergoes servicing, the other can continue to operate, thereby avoiding production downtime. Additionally, wood pellet output can be flexibly adjusted to meet market demand.

Cooling & Screening

Freshly pressed wood pellets are hot and brittle; they cannot be packaged immediately but must be fed into a counterflow cooler to rapidly cool to room temperature, thereby removing excess moisture and increasing pellet hardness.

The cooled pellets are then passed through a screening machine to remove fines and broken fragments, while the qualified finished pellets are conveyed to the packaging stage. The screened-out fines are returned to the pellet mill for reprocessing, thereby improving raw material utilization and reducing waste.

automatic Packing

Qualified finished products are transferred to the finished product warehouse, where an automatic packaging unit handles automatic weighing, bagging, and bag stitching. The bagged products are then put into storage.