0000000000552963
AUTHOR
Margareta Wihersaari
showing 14 related works from this author
Measurement methodology for greenhouse gas emissions from storage of forest chips–A review
2015
Abstract Research on greenhouse gas emission related to solid biofuels has focused mainly on the emissions from end use and the production chain. GHG emissions from the storage of forest chips have not received much attention in recent literature. In order for EU emission reduction targets to be fully understood, emissions from solid biofuel storage needs to be better described. Usually emissions from chip piles have been modelled using studies from organic waste composting but these two materials can differ appreciably; for example the C/N-ratio and moisture content. Herein, previous studies on greenhouse gas emissions from forest chips piles during storage are reviewed. The objective is t…
Torrefied versus conventional pellet production – A comparative study on energy and emission balance based on pilot-plant data and EU sustainability …
2015
Abstract Torrefaction is an emerging technology which enables greater co-firing rates of biomass with coal. To date however there has been a lack of real production data from pilot-scale torrefaction plants. Without such data any environmental benefits of torrefied pellet production are difficult to quantify. In this study data on consumable inputs from a semi-industrial torrefaction plant and the physical properties of produced pellets are used to analyse energy input and air emissions of torrefied pellet production and product transport. EU sustainability criteria are used to compare CO2-equivalent emissions from torrefied and conventional pellet production starting from harvesting of log…
Climate Change and Energy Issues in the North
2011
Highly industrialized societies are mostly responsible for the emerging anthropogenic climate change. There are different ways to measure this responsibility (e.g., whether based on causal contribution or strict responsibility, see Muller et al. 2007). However, regardless of the specific method applied to measure the impact, presently, the USA and the EU are the global leaders in green house gas emissions with countries such as China, India and Brazil following closely behind. Globally, GHG emissions are still increasing among the highly industrialized countries, particularly in the USA – a country that never ratified the Kyoto Protocol. However, the EU has managed to curb its emissions, co…
Bio-coal, torrefied lignocellulosic resources – Key properties for its use in co-firing with fossil coal – Their status
2012
Abstract Bio-coal has received generous amounts of media attention because it potentially allows greater biomass co-firing rates and net CO2 emission reductions in pulverised-coal power plants. However, little scientific research has been published on the feasibility of full-scale commercial production of bio-coal. Despite this, several companies and research organisations worldwide have been developing patented bio-coal technologies. Are the expectations of bio-coal realistic and are they based on accepted scientific data? This paper examines strictly peer-reviewed scientific publications in order to find an answer. The findings to date on three key properties of torrefied biomass are pres…
Torrefaction technology for solid fuel production
2011
From wood pellets to wood chips, risks of degradation and emissions from the storage of woody biomass – A short review
2016
Abstract The compounds in stored woody biomass degrade as a result of chemical and/or biological processes during storage. These processes produce gaseous emissions. Recent studies concerning gaseous emissions from wood pellet storages are reviewed herein. The applicability of the results from pellet research to wood chips is discussed. Thorough scientific understanding on the storage phenomena of wood chips is extremely important as the threat of climate change and the need to reduce greenhouse gas emissions have led to an increased need to large scale wood chip storage to ensure supply. Typically the gases produced from stored woody biomasses are carbon monoxide (CO), carbon dioxide (CO 2…
Kestävän bioenergiatulevaisuuden rakentaminen : työelämän ja jatko-opintojen yhteensovittaminen
2012
Kestävän bioenergiatulevaisuuden rakentaminen : bioenergia osaamisprofiili, Nuori tutkija -kysely
2012
Kestävän bioenergiatulevaisuuden rakentaminen : Osa 2, Bioenergiaopetus Keski-Suomessa bioenergiakoulutuksen resurssit
2011
International bioenergy education in Europe : an overview
2011
Kestävän bioenergiatulevaisuuden rakentaminen : Osa 1, Keski-Suomen bioenergiakoulutuksen historia ja tulevaisuus bioenergiakoulutuksen resurssit
2012
Kestävän bioenergiatulevaisuuden rakentaminen : verkko-opetuksen kehittäminen
2011
Saatesanat: Verkko-opetuksesta puhutaan paljon, mutta harva opettaja vielä tietää mihin kaikkeen verkkoopetusta kannattaa käyttää, millaisia toteuttamismahdollisuuksia on olemassa ja millaisia työvälineitä verkko-opetuksessa tarvitaan. Verkko-opetuksen mahdollisuus ja olemassaolo herättää paljon kysymyksiä: Kuinka paljon resursseja tarvitaan suunnitteluun? Tarvitseeko verkkoopetuksena toteutettava kurssi ”starttirahaa”? Kuluuko opettajan oman työajan lisäksi muita resursseja? Säästyykö oma työpanos tulevaisuudessa, kun ensimmäinen verkkokurssi on kerran pidetty? Mikä on opettajan rooli? Voiko verkkokurssit tehdä opettajat jopa tarpeettomiksi?