Stubbtransporter och bränslekvalitet hos stubbved
Stump wood is a hot alternative when the heating plants demands more and more forest fuel. The aim with the study has bean to calculate the costs in four different systems for transportations of stump wood, examine if there are any differences in fuel quality for the stump wood in the different systems, analyse if the fuel quality in stump wood is affected with the time it lays by the road side and how much space the stump wood demands on the road side. To calculate the costs for the different systems a system analysis was carried out, where some of the costs were collected through field studies on Holmen Skog stump experiment and other costs were collected from literature and contacts. Data for the fuel quality study was collected from Eons heat plant in Norrköping. Data for the study of how much space stump wood takes along a roadside was collected from field studies.
A system, where stump sections are transported with a lorry from the roadside to the power plant, is the cheapest system if the transport distance is short. A system where the stump wood is crushed at the landing site is the cheapest if the transport distance is a bit longer. A system where the stump wood is taken to a terminal, crushed there and then transported with a chip lorry to the heat plant has a cost just above the system where the stumps is crushed at the landing site. A system with terminal and train is the cheapest system if the transport distance is 250 kilometres.
The study of the stump wood fuel quality revealed that stump wood becomes dryer the longer it is stored at the landing site. No conclusion could be made about how the time at the landing site affected the amount of ash content in stump wood. The study of how much space stump wood takes by the landing place revealed that stump wood needs about 20 meter along the roadside per hectare of harvested stump wood.