Pelleting - Clenergen Corporation

Pelleting

Attention: open in a new window. PDFPrintE-mail

Europe in particular has a huge power industry emerging which requires vast quantities of biomass for its operations. Clenergen sees pelleting as one of the most efficient ways of creating a fuel from biomass in order to help satisfy this insatiable demand of the power producers.

In the pelleting process the 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. The high pressure of the press causes the temperature of the wood to increase greatly, and the lignin plastifies slightly forming a natural 'glue' that holds the pellet together as it cools.

The pellets contain a low humidity content that allows them to be burned with a very high combustion efficiency. Their regular geometry and size allows automatic feeding with fine calibration. In addition their high density permits compact storage and rational transport over long distance.

Pellets conforming to the norms commonly used in Europe (DIN 51731 or Ö-Norm M-7135) have less than 10% water content, are uniform in density, cannot contain any recycled wood or outside contaminants, have good structural strength, and low dust and ash content. Because the wood fibres are broken down by the hammer mill, there is virtually no difference in the finished pellets between different wood types.