Sawdust Pellet Plant Production Line

Why Make Sawdust Pellets?

Sufficient and cheap sawdust material source: Sawdust is the residue of wood processing factory. The amount of sawdust material is large and the price is cheap. Sawdust pellet mill can also be used to deal with life wastes such as leaves, straw and crops waste. It is a way to make waste profitable. And by making these biomass materials into fuel pellets, we no longer have worry how to dispose of these wastes.

Great demands for sawdust pellets: As the price of coal rise, finding coal fuel replacement is urgent. More and more people turn to biomass pellets. The market demand is large. Sawdust pellets not only be used at home in our daily life, but also can be applied to industrial production such as power plant.

Richi Machinery easy to maintain sawdust pellet plant production line is biomass fuel equipment which can process eucalyptus, birch, poplar, fruit and crop straw, bamboo chips into pellet. Which can effectively solve the coarse fiber difficult to pelletize. The wood must have been debarked prior to passing through the saw mill. Sawdust of hardwoods can be missed in with that of softwood, but successful production of hardwood pellets without binders is more difficult.

How to Make Sawdust Pellets?

Sawdust Pellet Plant Production Line Flowchart

Sawdust preparation

As the sawdust arrived in the sawdust pellet machine plant, the moisture content should be tested. The moisture content gives the proportion of evaporable water in the total weight of material. The sawdust with high moisture content should be stored separately from the low moisture content sawdust. The production of 1 ton pellets needs the about 7 bulk m³ sawdust with the moisture content around 50-55%. The optimum moisture content of the sawdust is 10-15%. The sawdust with higher moisture content should be dried before entering the sawdust pellet machine while the lower one can skip the procedure.

Drying

The wet sawdust should be dried before size reduction because the wet sawdust consume more power to be hammered than the dried one does. And also the wet sawdust may risk the screening by clogging or smearing the screen. Drying can be done by the dryers.

Screening

The screening of the sawdust is to remove the stones, plastics, metals, or other hard materials that may damage the equipment. The stones and stone like hard materials are removed by a stone trap when the sawdust passes over the screen while the metals are picked up by a magnet .

Hammering

The hammering is meant to homogenize the sawdust to an even-size. In the piles and piles of sawdust there are might be wood lumps, dead knots, etc. which needed to be hammered so that they can pass the die holes of the sawdust pellet machines.

Pelletizing

When the sawdust goes into the pelletizing chamber of the sawdust pellet machine, the lignin of the sawdust will be heated up to 120-130 ℃ by the heat produced by the running sawdust pellet machine and by which the lignin will be plasticized and binds the particles together to help to mold the pellets. The pellets are molded by being pressed through the pellet dies of the sawdust pellet machines and then are cut off by the cutter with the desired length. During the pelletizing, the binder may be needed to improve the pellet strength and durability.

Cooling

The moment when the pellets leave the sawdust pellet machines, they are hot and plastic. Then they need to be cooled down to become hard and rigid and to dry up so that the final moisture content after the cooler can be as low as 6% which may be increased up to 8 to 10 % by absorbing moisture from the surround air.

Packaging

Before packaging, the pellets will be screened again for recycling the fines. And then the pellets will be packaged. For domestic users, the pellets are preferred to be packed into bags with the sizes of 12, 15, or 20 kg. while for exporting, the pellets are usually shipped in one tone bags or in bulk which are usually wrapped in plastic to keep the moisture out. Compare with the large bulks or bags, the small bags are better for the pellets because the pellet are subject to less abrasion during delivery.

Advantages of Sawdust Pellets

• Efficient. Sawdust pellets are one efficient biomass fuel for its low moisture and ash content.
• Convenient. After pelleting, sawdust pellets are in uniform size and can be packed in bags, which makes pellets easy to be store and transport.
• Cost-effective. Compared with other home fossil fuels, sawdust pellets are economically competitive, moreover the prices are less volatile.
• Renewable. Sawdust pellet is made of residues of woods or other forest by-products, so it is an unlimited fuel sources. Besides, it can be locally made and providing jobs.
• Environmental friendly. Being one sustainable fuel source, sawdust pellets is carbon neutral.

Application of Sawdust Pellets

1.Home cooking and heating. Sawdust has high combustion with low ash content, so it is suitable for home cooking and heating.

2.Biomass boiler. Being one common biomass material to be used in biomass boiler, sawdust pellet is similar to EFB pellet, the difference between them is the feedstock.

3.Household BBQ rack. Regarding of renewable and environmental protection, catering industry and domestic BBQ like to take sawdust pellets as fuel replacement. Besides compared with charcoal, sawdust pellets makes BBQ much cheaper.

4.Power plant. Along with the international demand to reduce CO2 carbon dioxide emissions, biomass pellets is becoming a more and more popular fuel to generate power.

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