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TECHNICAL DETAILS OF THE PELLETS AS PRODUCT
Diameter (D): 6-10 mm
Length (L): 15-30 mm
Humidity: 8-10 %
Raw material: sawdust, clippings and shredding made from coniferous and deciduous wood ( approx. 70+30%) or exclusively coniferous wood.
Energy value: approx. 18,5 MJ / kg = 5,14 kWh /kg
Packaging: – small bags of 15 kg
– Big-Bags of 1000-1200 kg
THE PRODUCTION OF PELLETS
Wood pellets are produced by recycling wood residues 100%.
In the first phase of the production process, the wet raw material is dried in a drying system until a 8-10 % humidity. Following this process, the wood material passes through a hammer mill to provide a uniform mass, which reaches the press through a ventilation system where it is squeezed through a die having holes of the size required, usually of 6-10 mm. In this press the shredded, dry material is turned into high density and compact wood pellets. After conditioning, the product is packed in 15 kg small bags or 1000-1200 kg Big-Bags.
QUALIFICATION OF PELLETS
The most important surface criteria are the following:
The surface of the good quality pellets is smooth, shiny, without cracks.
Solidity is the most important criteria of good quality wood pellet. It determines the density of the pellets, as well as the proportion of shredded wood material and dust. For an efficient combustion a high density is required ( > 1,12 kg/dm3).
Solidity of the pellets is determined by the shredding degree, which determines the amount of shredding that is produced at a certain loading. The degree of loading can not exceed 2-3 %.
The most common types of pellets are the 6-8 mm pellets, but occasionally one can find 4-5 mm and 10 mm pellets. The thickness of the pellets determines the combustion time , as well the oxygen needed for combustion. Stoves are designed according to these characteristics.
During production, due to the high temperature, the melting lignin gives out a particular smell which gives the sweetish, glue-like smell of the fresh pellets.
OTHER RELEVANT QUALIFYING CRITERIA
The amount of additional material used in the pressing process (%): approx. 2%