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Stump as a fuel

the influence of harvesting technique and storage method on fuel quality of Norway spruce

Anerud, Erik (2010). Stump as a fuel. Uppsala : Sveriges lantbruksuniv. , Rapport / Institutionen för energi och teknik, SLU, 1654-9406 ; 024
ISBN 978-91-86197-89-6
[Licentiate thesis]

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Uncertain long-term availability of fossil fuels and the negative environmental impact of using it have created an urgent need for reliable renewable energy sources. Wood fuel, particularly forest residues is one of these sources which are in high demand in Sweden today. Stumps can be used as a complement to these, since they contain high concentrations of energy-rich lignin and extractives. However, stump removal can have negative environmental effects such as reduction of biodiversity and disturbance of nutrient balance in the soil. As to the fuel quality of stump biomass, there are some concerns connected with the utilisation of stumps since presence of excessive contaminants leads to high ash contents which reduce its value as fuel and causes operating problems. To ensure the supply of fuel of acceptable quality, an optimal system for harvesting, handling, and storage must be devised for stump procurement. The main aim of this work was to evaluate various stump harvesting techniques, storage methods (windrow or heaps), and different storage durations at two geographical locations and examine their effect on the fuel quality of Norway spruce stump biomass. Fuel quality parameters moisture content, ash content and calorific value were evaluated on five occasions during May 2008 - September 2009. Stump harvesting techniques that split the stumps allowed better drying during 13 months of storage. Storage method had no clear effect on these stumps. The ash content decreased considerably, particularly when transport and crushing took place at temperatures exceeding 0°C. In general, fuel quality was improved in all treatments after storage. However, as the storage time progressed, the net energy increment became continuously smaller due to the increased substance losses.

Authors/Creators:Anerud, Erik
Title:Stump as a fuel
Subtitle:the influence of harvesting technique and storage method on fuel quality of Norway spruce
Series Name/Journal:Rapport / Institutionen för energi och teknik, SLU
Year of publishing :2010
Number of Pages:49
I.Stumps as a fuel - a review of the supply chain from harvesting to end-user. Anerud, E. Jirjis, R. Nordfjell, T. (2010). To be submitted to Renewable & Sustainable Energy Reviews.
II.Anerud, E. & Jirjis, R.(2010) Fuel quality of Norway spruce stumps - Influence of harvesting technique and storage method. Submitted to Scandinavian Journal of Forest Research.
Place of Publication: Uppsala
Publisher:Institutionen för energi och teknik, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-86197-89-6
Publication Type:Licentiate thesis
Full Text Status:Public
Agrovoc terms:picea abies, stumps, fuelwood, handling, storage, quality, ash content, evaluation
Keywords:ash content, calorific value, moisture content, stump wood, wood fuel quality
Permanent URL:
ID Code:2324
Faculty:NL - Faculty of Natural Resources and Agricultural Sciences (until 2013)
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: Erik Anerud
Deposited On:11 Aug 2010 00:00
Metadata Last Modified:08 Sep 2017 10:55

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