Wood Pellet Mill

wood pellet mill

Wood pellets are commonly made of sawdust, shavings and fines—residuals of the wood-working industry—but can be made from a variety of biomass materials. At the pellet mill the material is dried and compressed into pellets, which are more durable and easily transported, and act as a substitute for fossil fuels.

Raw Material→Chipping→Crushing→Drying→Mixing→Conveying→Pelletizing→Cooling →Packing

1. Crushing Process:
When the thickness of raw wood material is >10mm, and >50* 50 mm (L * W), a wood chipper must be used to process the material into small pieces. Afterward, a hammer mill (crusher) is used to convert the small pieces of wood into pieces with a diameter of less than 3 mm.

2. Drying Process:
The best moisture content for pelletizing is about 13-15%. The GEMCO rotary dryer is made up of a stove and main rotary dryer, which can realize moisture reduction from 60% to 10%. Our stove is fueled by coal, which can save on the consumption of electricity. The rotary dryer is specially designed to save energy. The surface of the dryer is covered with a special sheet to prevent heat from leaking.

3. Pelletizing Process:
The MZLH Wood Pellet Mill is the most important piece of equipment in a complete wood pellet line and has the following features:

a. The lubrication system for the wood pellet mill utilizes a tracing and inspecting system controlled by a microcomputer. When the temperature of the bearings is above normal, the microcomputer begins an auto-lubrication system. This reduces the frequency of stopping production for maintenance reasons. There is also an option to apply lubrication manually.

b. Drive gear adopts a high-precision gear transmission structure. The bearings are produced by SKF of Sweden. The ring die utilizes hoop fastening which creates a faster rate of discharge in comparison to previously used bolt fastening. This and other features combine to raise the capacity 10-15% over drives using a belt transmission.

c. The ring die and rollers of our wood pellet mill precision machined and comprised of alloyed steel. Special heat treatment further differentiates these key components from other manufacturers in China. The carburizing treatment deepens the hard facing to 2mm to improve the anti-abrasion properties of the ring die and rollers by a factor of 10. This largely cuts down on replacement costs.

4. Cooling Process:
After the pelletizing process, the temperature of the wood pellet is about 60-80 degrees Celsius, with a moisture content of about 15%. A cooler must then be used to reduce the pellets’ moisture content to about 3-4%. Some foreign customers in humid clients have asked for systems which cool pellets at 7-8% moisture content. For customers with these preferences, we offer a new combined stabilizer-cooler.

5. Packing Process:
Packing protects the pellets from environmental conditions in preparation for storage. For this we supply the best domestic semi-auto packing machine. Generally, most customers need one small weight-range scale with an auto-sealing packing machine, and one large weight-range scale with a semi-auto packing machine. For the small scale, the weight range is 15-25 kg per bag. For the large scale, it is 1000 or 800 kg per bag. These can be modified to the different needs of customers.

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