What is the production process of biomass pellet fuel?
Raw Material Pretreatment
First, sawdust, as a biomass raw material, requires screening. This is because sawdust can come from a variety of sources and may contain large sawdust, wood chunks, or other impurities. Screening removes these impurities, ensuring a uniform particle size and facilitating subsequent processing.
Screened sawdust typically requires drying. Excessive moisture content can affect pellet quality; an appropriate moisture content is typically around 10%-20%. Drying can be done naturally in the sun or using specialized drying equipment, such as a rotary dryer. Dried sawdust is easier to compress and mold.
Feeding Process
Pretreated sawdust is conveyed to the feed port of the biomass pellet machine. The pellet machine typically has a feed mechanism that controls the sawdust feed rate. This feed rate is adjusted based on the pellet machine's production capacity and process requirements to ensure stable and uniform feed. For example, some advanced pellet machines use a screw feeder, which precisely controls the sawdust feed rate, ensuring a continuous and steady flow of sawdust into the pressing chamber.
| Model |
Power |
Mold Hole |
Capacity for industrial solid |
Capacity for biomass |
Pellet size(mm) |
| MKYK-36 |
45kw |
36 |
0.5-1.0 |
1.0-1.5 |
32*32*50-100 |
| MKYK-48 |
75kw |
48 |
1.0-1.5 |
1.5-2.5 |
32*32*50-100 |
| MKYK-72 |
110kw |
72 |
2.0-2.5 |
2.5-3.5 |
32*32*50-100 |
| MKYK-90 |
132kw |
90 |
2.0-2.5 |
3.5-5.0 |
32*32*50-100 |
| MKYK-120 |
200kw |
120 |
3.0-4.0 |
4.0-6.0 |
32*32*50-100 |
| MKYK-150 |
250kw |
150 |
4.0-6.0 |
6.0-10.0 |
32*32*50-100 |
3. Pressing Process
Pressure Application: The pressing chamber of a biomass pellet machine consists of two key components: the press roller and the ring die. Once the sawdust enters the pressing chamber, the press roller rotates under the power of a power unit, squeezing the sawdust into the ring die's holes. The ring die has numerous evenly distributed small holes, and the size and shape of these holes determine the size and shape of the final biomass pellets. For example, common pellet diameters range from 6 to 10 mm. Specific sizes can be achieved by replacing ring dies of different specifications.
Frictional Heating and Bonding: As the press rollers apply pressure to the sawdust and force it through the ring die, intense friction is generated between the sawdust particles. This friction raises the temperature of the sawdust, typically reaching around 80-100°C. Under the high temperature and high pressure, the lignin in the sawdust softens and acts as a binder, bonding the particles together, thus forming biomass pellets with a defined shape and strength.
4. Forming and Discharging
When the sawdust is pressed through the ring die's holes by the press rollers, biomass pellets are formed. These pellets are cut off by the cutting device on the outside of the ring die to form pellets of equal length and then discharged through the pellet machine's outlet.
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FAQ
Q: Are you a factory?
A: Yes, we are, so we can offer you lower prices.
Q: What is the quality of your equipment?
A: We conduct multiple quality inspections before shipment to ensure quality, and we provide comprehensive after-sales service, so you don't have to worry.
Q: Do you provide a product manual?
A: We do provide a product manual and videos, and if necessary, we will visit your factory to assist you with any issues.
For more information on process design, equipment layout, plant construction plan, single machine equipment quotation, turnkey quotation, etc., please feel free to contact us.
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