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Comparison Between Pellets and Briquettes

Comparison Between Pellets and Briquettes
Wood pellets
and briquettes are made by compressing dry sawdust or wood shreds under high pressure until the lignin softens and binds the material together. The use of compression technology increased bulk density resulting in lower transportation costs, reduced storage volume and easier handling. Meanwhile it improve energy density and more homogeneous composition provide better options for burning, and therefore a more efficient combustion process.
Properties of wood pellets
Wood pellets should be dry, clean, mechanically robust and have an ash content defined by the appropriate standard . The quality of the pellet is its mechanical durability and its density are mainly determined by the sieving of the milled material prior to pressing, the moisture content and by the pressure obtained in the press matrix.

pellets and briquettes

Briquettes types
Charcoal: Charcoal briquettes are made by compacting coal dust at high pressure to form a high density fuel block.
Peat (commonly used in Ireland)
Biomass: These are made from agricultural waste and so are a renewable energy source and help reduce deforestation in developing countries. Biomass briquettes serve to fuel biomass cook stoves a common cooking technology used to improve health effects; the dangers and risks associated with wood collection and deforestation problems in the developing world.
Pellets versus briquettes
Densified products can be found as briquettes or as pellets.The heating value, moisture content and chemical characteristics are about the same for both but the density and strength are somewhat higher for pellets. The main difference is in size. Pellets are 4-5 times longer than their diameter (ranging between about 6-12 mm), while briquettes have a diameter of 80-90 mm, or dimensions 150 x 70 x 60 mm .
As opposed to pellets, which are produced using a pressure about 700 bar in rotating presses , briquettes typically formed in recenter presses at pressures no higher than 200 bar. Hence, briquettes become much more brittle than pellets and can not withstand mechanical wear. The bulk density with briquettes scarcely exceeds 500 kg/m3but is still significantly higher that the bulk density for the saw dust and cutter shavings. So briquetting may significantly lower the cost to transport the residual fuel fractions from carpentry to an energy plant. Briquettes are primarily used instead of firewood for manually charged domestic stoves. Pellets can be used in automatically charged stoves and boilers due to their good flow ability, uniform water content, grain size and chemical composition.