Wood Pellet Mill
We provided such full services as process design, auto-control, layout, manufacture, installation and after-sales guarantee on biomass pelletizing plant. We also provide auxiliary equipments and spare parts for pellet mill.
Pelletizing is the process of making waste materials into solid fuel. The objects are used for burning purposes. Wood Pellet is one of the most commonly used pelletizing materials.
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Detailed Product Description:
1. Raw material:
Pellet fuel is mainly made of sawdust, shavings and fines leftover after processing trees for lumber and other products. The raw material also can be corn or other biomass material.
2. Introduction of Process:
At a pellet mill, the material is dried, compressed and formed into small eraser-sized bits. They are clean, pleasant to smell and smooth to touch.
Directly before pellet press, a product with a granular size of approx 4 mm and a residual moisture content of approx 15 % is required.
The technology can use PLC automatic control system. In the process of crushing and pelletizing, speed control system can be used for feeding material, which adjust the quantity of flow speed of material according to load of main motor. The moisture test points are designed for testing moisture of raw material and material after drying. The material with high or low moisture are separated and feed in back after processing.
3. Tech. Data
Capacity: 1 t/h ~ 6 t/h (based on a mixture of 50% pine and 50% spruce wood)
Raw Materials: Wood sawdust, logs from soft wood
Product Diameter: 6mm or 8mm (optional)
Product Density: 1.1~1.3 kg/m3
Final Moisture: <8%
Note: The above data concerning capacity, consumption may vary depending on the origin, nature of the raw material.
Current Data
Service Voltage: 380V, 50Hz
Control Voltage In Switch Cabinet: 220V, AC
Signal Voltage For Valves, Initiators 24V, DC
Painting Optional by users
4. Highlight of our equipments
> Reliable continuous operation
> Low energy consumption
> Low maintenance cost
5. Flowchart for wood pelletizing plant
Raw Material→Chippering→Crushing→Drying→Mixing→Conveying→Pelletizing→Cooling
1 Crushing Process:
When the thickness of raw wood material is >10mm, and >50 * 50mm(L * W), we need use the Wood Chipper to chip them into small pieces, then crush the small pieces into wood powder with diameter less 3mm by Hammer Mill (Crusher).
2 Drying Process:
The best moisture content to pelletizing is about 13-15%. Our Rotary Dryer is made up of Stove and Main Rotary Dryer, which can realize to reduce the moisture from 60% to 10%. Our stove is fueled by coal, which can save electricity consumption largely.
3 Pelletizing Process:
MZLH Wood Pellet Mill is the most important equipment, which have the following features:
1). The lubrication system for wood pellet mill adopts the tracing and inspecting system controlled by the microcomputer. When the temperature of the bearing is over the normal temperature, the microcomputer will start the Auto-Lubrication System to lubricate the bearings, which complete solved the trouble of lubricating roller depending on the operation experience. The Lubrication System is made up of the tracing and inspecting system controlled by the microcomputer, auto-lubricating system on time and compelled lubricating system by hand.
2). Driving Gear adopts the high precision gear transmission structure. The wear bearing is SKF from Sweden. The ring die adopts the hoop fastening method, which is increasing the speed of discharge comparing with the past bolt fastening method. As a result, the capacity is 10-15% higher than the belt transmission structure.
3). As per the ring die and roller of the wood pellet mill, we have the fine machining with the alloyed steel. And our heating treatment is also different from the other domestic manufacturer, our carburizing treatment make the depth of hard facing to 2mm, which improve the anti-abrasion of the ring die and roller more than 10 times, it can save the production cost heavily.
Additionally, we have developed one kind of new Air Current Rotary Dryer, which can save about 30% energy consumption comparing with the old Rotary Dryer.
4 Cooling Process:
After the pelletizing process, the temperature of the wood pellet is about 60-80 degree, and the moisture content of the wood pellet is about 15%, so we need use Cooler to reduce about 3-4% moisture, such this the wood pellet is easy to store.
But considering the feedback from some foreign clients, the local climate is very humidity; they hope to cool the wood pellet with moisture 7-8%. In order to satisfy the different need from different clients, we develop one kind of new Stabilizer Combined Cooler.
5 Packing Process:
After cooling, the wood pellet mill not directly enter into the fuel process, avoiding the wood pellet affected with damp. The packing process is necessary. In this process, we assemble our domestic best Semi-Auto Packing Machine to you.
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How many pellets can I make per hour?
Can I adjust the pressure to mill different materials?