Wood pellets (normally 6 mm diameter, sometimes 8 mm or larger) are generally made from wood wastes such as saw dusts, shavings or ground wood chips. It is important that the raw material is dry (moisture 8-10%) and homogenous.
This wood material is fed to a press, where it is squeezed through a die having holes of the size required.The high pressure of the press causes the temperature of the wood to increase greatly and the lignin plasifies slightly forming a natural ‘glue’ that holds the pellet together as it cools.
Sweden, Canada and USA are global leaders in wood pellet production. Wood pellets are widely used in Europe, especially in large scale co-firing (mainly in Netherlands, Belgium, Sweden, Denmark and Finland) and small scale heating applications. For residential usage there is a good demand for pellets in Sweden, Denmark, Italy, Germany, Austria, France and Finland.
Several countries such as Baltic States, Finland, Russia, Poland and Canada are exporting large quantities of wood pellets. The price of wood pellets fluctuates between 150 to 250 Euro/ton. Compared to Europe, at present there is not much usage of wood pellets in Asia and Africa. But the markets are growing now. Some countries produce wood pellets mainly for export.
Biomass briquetting is the process of densifying loose agro-waste into a solidified biomass of high density. The moisture contents of the briquettes are usually less than 12%. The preprocessed agro waste is subjected to a high temperature and pressure. Then the lignin melts out to the surface, allowing the loose particles to adhere to each other, thereby forming a cohesive mass which is then air dried.
Biomass briquettes have a higher LHV and much lower ash content. They have high specific density (1,200 kg/m³) compared to 60 to 180 kg/m³ of loose biomass. Briquetting plants mainly utilize saw dust, bagasse, cotton stalk and rice husk.
Briquetting plants with both small and large scale production capacities are already in operation in several parts of the world. Biomass briquettes are widely used in Asian countries for various uses. Several suppliers are available in the market, for the large scale production of briquettes.
For services/queries/comments related to Biomass pellets and briquettes, contact us.
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