Biomass moisture content is defined as the amount of water in the biomass expressed as a percentage of the material’s weight. Moisture content has a significant effect on the engineering of the conversion process; either a thermochemical (i.e. combustion) process is considered or a biochemical (i.e. fermentation).
The quantity and quality of ash in biomass depends on a large amount of factors including its derivation , its growing and harvest conditions, the fertilization type, the harvest techniques, its storage and transportation along with its pretreatment before it is introduced into a bioenergy conversion process.
Ιn 2008, according to the European Program Pellets Atlas, Greece produced a total of about 27,800 tons of pellets, while the installed capacity amounted to 87,000 tonnes.
The EN 303-5 standard not only describes constructional and operational requirements but also sets the acceptable emission limits at the flue gases
EN 303-5 standard has been set for solid fuel (biomass included) heating boilers in order to define design, constructional, safety and operational requirements
The use of woody-biomass pellets for heating buildings has significant advantages and therefore in several European countries the number of residential heating systems which consume biomass (including pellets) has grown significantly the field during the last decade.
Wood pellets are manufactured mainly from timber industry residues, forest industry by-products or special sustainable short coppice crops. Apart from wood pellets there is also the potential for manufacturing agripellets which derive from agricultural residues, like straw or tree pruning.