I. Applications
A biomass pellet mill is a machine that produces pellet fuel from agricultural waste such as various branches, wood, sawdust, corn stalks, rice straw, sawdust, wood powder, and wood powder. The pellets produced can be used in fireplaces, boilers, and biomass power plants.
II. Classification
Based on the type of ring die used, it can be divided into flat die pellet mills and ring die pellet mills. Ring die pellet mills can be further divided into vertical ring die pellet mills and horizontal ring die pellet mills.
III. Features
The vertical ring die biomass pellet mill uses high-precision gear transmission for the main drive. The ring die uses a quick-release clamp type. High-quality bearings are used in the entire transmission system to ensure efficient, stable, and low-noise transmission. The quick-release clamp type ring die and frequency conversion speed control feeding ensure uniform feeding. The door cover is equipped with a high-strength feeder and an internationally advanced compensating serpentine spring coupling, featuring a novel, compact, safe, low-noise, and low-failure performance. IV. Working Principle of Biomass Pellet Mill
The biomass pellet mill utilizes the interaction of extrusion and friction between the pressure rollers and the die to shape the material. No additives or binders are required during processing. Straw and other materials contain cellulose and lignin. Lignin is a structural monomer in the material, a phenylpropane-type polymer compound. It strengthens cell walls and binds cellulose. Lignin is amorphous; at room temperature, most of it is insoluble in any solvent, has no melting point, but has a softening point. When the temperature reaches a certain value, the lignin softens, increasing its binding force. Under pressure, this causes the cellulose molecular clusters to displace, deform, and extend, resulting in the interlocking and recombination of adjacent biomass pellets, which are then pressed into shape.
V. Advantages
Advantage 1: Utilizing high-precision involute helical gears for direct transmission, the transmission efficiency reaches over 98%.
Advantage 2: The transmission gear blanks undergo water forging followed by normalizing heat treatment, improving the surface hardness. The tooth surfaces are carburized to a depth of 2.4mm, enhancing wear resistance and extending the service life of components. The hardened tooth surfaces are then treated with a silent precision grinding and edge-repairing process, resulting in quieter and smoother operation.
Advantage 3: The main shaft and integrated hollow shaft are made of imported German alloy structural steel, processed through water forging, rough turning, heat treatment, precision turning, and precision grinding. The rational structure and uniform hardness improve the fatigue resistance and wear resistance of the components, providing a more reliable guarantee for safe operation.
Advantage 4: The main unit housing is precision cast from high-quality steel, with uniform thickness and a compact structure. It is then meticulously machined by an imported Swiss CNC machining center, achieving zero machining accuracy. This provides stronger support for normal operation.
Advantage 5: The bearings and oil seals used in the transmission system all employ high-precision bearings imported from Japan and wear-resistant, high-temperature fluororubber oil seals imported from the USA. A special lubrication return system is added, with oil circuit circulation cooling and automatic timed oil lubrication. This ensures sufficient bearing lubrication and safer, more reliable operation.
Advantage 6: The bearings used in the pellet forming system are all high-quality silent bearings, and an added thin oil circulation cooling and lubrication system extends bearing life and enhances operational safety.
Advantage 7: The ring die is precision-manufactured using high-grade stainless high-nickel steel. Its unique and optimized compression ratio design improves product quality, extends die life, and minimizes production costs.
Advantage 8: The new generation biomass pellet mill was developed and designed by Tongchuang's senior designers, specifically for various biomass pelleting processes. The company has its own production base. This 560# ring die biomass pellet mill underwent hundreds of tests and demonstrations in the factory, ultimately determining it to be the most stable, reliable, efficient, safe, and economical model. The equipment can operate continuously for extended periods.
VI. Raw Materials
The raw materials for biomass pellets are very diverse:
Sawdust, shavings, bark, sanding powder, waste wood, and branches generated during wood processing and engineered wood product production;
Other types of combustible biomass can also be used as raw materials. No adhesives need to be added; these can all be processed into biomass pellet fuel.
VII. Finished Fuel Pellets
- Introduction to Biomass Fuel Pellets
Biomass fuel is made from solid waste materials such as corn stalks, wheat straw, rice straw, peanut shells, corn cobs, cotton stalks, soybean stalks, weeds, branches, leaves, sawdust, and bark. These materials are crushed, compressed, densified, and shaped into small rod-shaped solid fuel pellets. Pellets are produced by extruding sawdust, straw, and other raw materials using rollers and ring dies at room temperature.
- Characteristics of Biomass Pellet Fuel Products
By rationally controlling the moisture content of raw materials, the product boasts a high calorific value, low moisture content, complete combustion, and low ash content. It does not clump after combustion, preventing blockage of the burner and reducing damage to combustion equipment. The higher calorific value reaches approximately 4480 MJ/KG, and the lower calorific value reaches approximately 4038 MJ/KG, meeting quality standards. The product meets current low-carbon emission requirements, and all technical performance indicators meet national standards. It is extremely convenient to transport and store, has a high combustion utilization rate, and can replace coal, oil, and other fuels, reducing pollution. It is an environmentally friendly product that can replace non-renewable fuels such as coal and heavy oil, and is widely used in boiler combustion and other fields.
