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Time-Dependent Climate Impact and Energy Efficiency of Internationally Traded Non-torrefied and Torrefied Wood Pellets from Logging Residues

Porsö, Charlotta and Hammar, Torun and Nilsson, Daniel and Hansson, Per-Anders (2018). Time-Dependent Climate Impact and Energy Efficiency of Internationally Traded Non-torrefied and Torrefied Wood Pellets from Logging Residues. Bioenergy Research. 11:1, 139-151
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Official URL: http://dx.doi.org/10.1007/s12155-017-9884-x

Abstract

Demand for wood pellets as a renewable alternative to fossil fuels has increased in the past decade. However, production and use of wood pellets involves several operations (biomass extraction, chipping, transport, drying, milling, pelleting, combustion) with negative impacts on e.g. the climate. In this study, the energy efficiency and climate impact of production and use of non-torrefied and torrefied wood pellets were analysed and compared. The wood pellets, produced from logging residues extracted from a boreal coniferous forest stand (Norway spruce (Picea abies (L.) H. Karst)) in northern Sweden, were assumed to be exported and finally used in a power plant. Time-dependent life cycle assessment, expressing the climate impact as global temperature change over time, was used to include annual greenhouse gas fluxes of both fossil and biogenic origin. The results showed that carbon stock changes due to extraction of logging residues contributed most of the warming effect on global temperature. Due to greater
demand for raw material, a higher warming impact per gigajoule fuel was obtained for torrefied wood pellets than for nontorrefied wood pellets. However, torrefied wood pellets demonstrated a lower climate impact (per GJ electricity) when advantages such as higher electrical energy efficiency and higher co-firing rate were ncluded. A general conclusion from this study is that replacing coal with non-torrefied or torrefied wood pellets made from logging residues can mitigate climate change. The energy output of these systems was about sevenfold the primary energy input.

Authors/Creators:Porsö, Charlotta and Hammar, Torun and Nilsson, Daniel and Hansson, Per-Anders
Title:Time-Dependent Climate Impact and Energy Efficiency of Internationally Traded Non-torrefied and Torrefied Wood Pellets from Logging Residues
Series/Journal:Bioenergy Research (1939-1234)
Year of publishing :2018
Volume:11
Number:1
Page range:139-151
Number of Pages:13
Publisher:Springer Verlag
ISSN:1939-1234
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:K Forestry > K01 Forestry - General aspects
P Natural resources > P01 Nature conservation and land resources
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Climate Research
(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 207 Environmental Engineering > Energy Systems
Agrovoc terms:global warming, international trade, wood
Keywords:Life cycle assessment, LCA, Global warming, Time-dependent climate impact, Biogenic carbon, Torrefied wood pellets
URN:NBN:urn:nbn:se:slu:epsilon-e-4608
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4608
ID Code:14967
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: SLUpub Connector
Deposited On:11 Jan 2018 08:19
Metadata Last Modified:12 Mar 2018 09:33

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