Wood Pellet Mill

Introduction & Principle

Biomass ring-die pellet mill  is a nationally pioneering product designed by the technical team from Dingli. The design of molds is unique. The press rollers are made of wear-resistant alloy material, The working life of wearing parts is several times of similar products. Transmission structure can realize the automatic filtering process of grease. This product with unique design, proper structure, low energy cost and strong wear resistance, which fills the domestic technical blank of vertical ring-die pellet feeding equipment. This palletization equipment is applicable to materials which is difficult to mold and bond, such as rice husk, sunflower seed husk and peanut shell, branch, trunk, wood chips, sawdust, bagasse, agro waste, etc. The pelletized product can be used in the biomass fuel plant, power plants, timber processing plants, fertilizer plant, and chemical plants. This product is a satisfying compression molding equipment with low capital cost, quick profits and free risk. 

When powder materials with different granularity are imported into the compression zone between rotating die and driven rotating roller through the internal feeding device, the materials get a certain loose degree and pores of different sizes. Driven by rotational molding and extrusion, sliding and rolling happened between powder particles. The pore between powder particles decreases with the die and roller rolling gradually. Meanwhile the internal stress and material density increases, and the contact transferred from point to surface between the powder materials. When the stress reaches a certain value, the density of the material approach the expected value. High- density materials from pre-compression zone enter into the extrusion area. Shift from elastic deformation to plastic deformation result in the present of the flow characteristics on materials, which begin to enter the die hole. Because the press between powder particles belongs to the mechanical interlocking, the contact area between powder particles increases. The property of material itself and generated bondability leads to that the materials in the die hole at certain pressure get expected density and intensity and pushed out of die hole, powder palletization process is complete when the extruded materials are cut to the required length of particles.

• Raw materials
• Crushing
• Drying
• Pelletizing
• Cooling
• Packaging