Purpose and usage
Wood pellet is one of pellet fuel. It is energy supply for power plant, industrial boiler, family and central heating furnace system.
The most common type of pellet fuel and are generally made from compacted sawdust and related industrial wastes from the milling of lumber, manufacture of wood products and furniture, and construction and also virgin lumber.
Pellets are produced by compressing the wood material which has first passed through a hammer mill to provide a uniform dough-like mass. This mass is fed to a press, where it is squeezed through a die having holes of the size required (normally 6 mm diameter, sometimes 8 mm or larger and length is about 2~3cm). The high pressure of the press causes the temperature of the wood to increase greatly, and the lignin plasticizes slightly, forming a natural “glue" that holds the pellet together as it cools
Most of wood pellet in the market at present are made from sawdust. The combustion efficiency decides the quality. Therefore, the production process needs to be control strictly. There is DIN 51731 from Germany or Ö-Norm M-7135 from Austria for wood pellet conforming to make sure quality. Since 2011, AEBIOM coordinates EN PLUS to apply whole pellet supply chain – from production to delivery to the final customer, therefore to ensuring high quality as well as transparency. EN PLUS is commonly recognized internationally.
Weng Feng Ying(2008), New Star of energy of wood pellet, Energy report March, page23-26.
Weng Feng Ying(2009), Development of wood pellet in America and Europe, Energy report August, page 28-31.
En Plus website