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The equipment required for the processing of wood chips includes hammer mill crushers, dryer machines,wood granulators, etc. Its processing technology is as follows:
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 wood 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.
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.
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.
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.
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 ring 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.You need good quality ring die wood pellet mill in this section.
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.
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 20kg. 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.
The following biomass sawdust production lines can give you some reference:
Forestry Waste Pellet Line:https://www.cn-pellet.com/solution/wood-pellet-production-line/forestry-waste-pellet-line.html
Waste Organic Matter Pellet Line:https://www.cn-pellet.com/solution/wood-pellet-production-line/waste-organic-matter-pellet-line.html
Agricultural Waste Pellet Line:https://www.cn-pellet.com/solution/wood-pellet-production-line/agricultural-waste-pellet-line.html
Palm Shell Pellet Line:https://www.cn-pellet.com/solution/wood-pellet-production-line/palm-shell-pellet-line.html
High quality sawdust pellets are with low moisture content and high heating energy and efficiency. They are easy to be handed, burned, transported and stored. The sawdust pellets are usually used for heating by larger scale power plants, biomass boilers, and centralize steaming boilers and also popular with the household for heating and cooking.Richi Machiney provide factory directly wood sawdust pellet mill and complete biomass sawdust pellet plant,welcome to contact.
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