Pelletskvalitet
Test av olika råvarumixer i pelletstillverkningen vid Rindi Västerdala AB
Fuel pellets are a refined bio fuel mostly consisting of residues from sawmills and wood industry. At Rindi Västerdala AB's combined bio energy plant in Vansbro fuel pellets are produced, while the waste heat from the process is used for district heating. The pellets are produced from sawdust, wood shavings and dry wood chips that is dried, milled and pressed into small cylindrical rods. The advantage of refining the wood material in this manner is that the energy value is greater per unit volume and unit weight, thereby the cost of transportation per energy unit is reduced. Also, less storage space is needed.Pellet manufacturing is a complex process since many parameters affects the final results. Wood is a living material that varies in texture, moisture content and composition. That makes it difficult to accurately control the manufacturing process.The purpose of this study is to ensure a mix of available raw materials that provides an approved quality on the pellet while production capacity remains as high as possible. Three mixtures of raw material were selected and tested in the facility in the same time as the pellet quality was analyzed.The results showed that all the tested material mixtures gave an approved pellet quality with the exception of some individual abnormal samples.