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Publications (10 of 34) Show all publications
Ståhl, M., Frodeson, S., Berghel, J. & Olsson, S. (2019). Using Secondary Pea Starch in Full-Scale Wood Fuel Pellet Production Decreases the Use of Steam Conditioning. In: World Sustainable Energy Days 2019: European Pellet Conference. Paper presented at World Sustainable Energy Days 2019/European Pellet Conference. Wels
Open this publication in new window or tab >>Using Secondary Pea Starch in Full-Scale Wood Fuel Pellet Production Decreases the Use of Steam Conditioning
2019 (English)In: World Sustainable Energy Days 2019: European Pellet Conference, Wels, 2019Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Wels: , 2019
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kau:diva-71435 (URN)
Conference
World Sustainable Energy Days 2019/European Pellet Conference
Available from: 2019-03-05 Created: 2019-03-05 Last updated: 2019-03-05
Kjeang, A., Govindarajan, V., Ståhl, M. & Palm, J. (2017). Energy consulting services in the information age: literature review. Energy, Sustainability and Society, 7(30), 1-10
Open this publication in new window or tab >>Energy consulting services in the information age: literature review
2017 (English)In: Energy, Sustainability and Society, ISSN 2192-0567, Vol. 7, no 30, p. 1-10Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Springer, 2017
Keywords
Energy advice, Energy efficiency
National Category
Engineering and Technology Environmental Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-62989 (URN)10.1186/s13705-017-0132-1 (DOI):000414332500001 ()
Available from: 2017-09-10 Created: 2017-09-10 Last updated: 2018-08-20Bibliographically approved
Ståhl, M., Berghel, J. & Frodeson, S. (2017). Research Experience From The Use Of Different Additives In Wood-Fuel Pellet Production. International Journal of Energy Production and Management, 2(3), 288-293
Open this publication in new window or tab >>Research Experience From The Use Of Different Additives In Wood-Fuel Pellet Production
2017 (English)In: International Journal of Energy Production and Management, ISSN 2056-3272, E-ISSN 2056-3280, Vol. 2, no 3, p. 288-293Article in journal (Refereed) Published
Abstract [en]

The use of wood-fuel pellets has increased signi cantly worldwide in recent years, especially in the United Kingdom. If wood-fuel pellets should continue to be a successful biofuel at the energy market, the pellet production industry has to reduce the production cost, since it is a low-margin business. Further, improved pellets regarding storability and strength of the pellets are crucial to manage the overseas transportation that causes material losses. In addition, the industry tries to produce pellets from a broader raw material base and at the same time satisfy the customer requirements while produc- ing a sustainable product. The wood-fuel pellet industry has the possibility to meet all these criteria; however, it also has the potential for improvements. Using additives in pellet production is one way to meet the criteria. In conclusion, it is necessary to do the research that systematically investigates the consequences of using additives for wood-fuel pellets, and this work presents a compilation of results and experiences from more than 20 different additive studies and the test bed for pellet produc- tion research at Karlstad University– a pellet production unit adapted for additives studies. Additives, with an admixture of up to 2% (wt.), have been tested in the NewDeP (New Development for Pellet Technology) pilot plant for pellet production at Karlstad University. The research has focused on the electricity consumption, the physical and mechanical properties of the pellets, and the CO2 equivalents emitted during production. The results showed that the additives Wetland grass, Algae, Turpentine and Lignin decreased the electricity consumption in the pellet press but unfortunately also decreased the durability. The additives Resins, Molasses, White sugar, Native potato starch and Oxidized potato starch increased the durability of the pellet but showed almost no change in the electricity consumption. However, Oxidized corn starch, Spent sulphite liquor and Native wheat starch as additives increased the mechanical properties while it decreases both the electricity consumption and the climate impact, hence a Win-Win-Win situation. 

Place, publisher, year, edition, pages
WIT Press, 2017
Keywords
additives, CO2 equivalents, durability, electricity consumption, wood-fuel pellets
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-70043 (URN)10.2495/EQ-V2-N3-288-293 (DOI)
Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2018-11-07Bibliographically approved
Berghel, J., Ståhl, M. & Frodeson, S. (2017). The amount of dust and rejects as well as the electricity consumption during production decreases with the use of adequate additives. In: : . Paper presented at International Biomass and Conference & Expo, Minneapolis, Minnesota, USA. 10-12 April 2017.
Open this publication in new window or tab >>The amount of dust and rejects as well as the electricity consumption during production decreases with the use of adequate additives
2017 (English)Conference paper, Oral presentation only (Other academic)
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-63905 (URN)
Conference
International Biomass and Conference & Expo, Minneapolis, Minnesota, USA. 10-12 April 2017
Available from: 2017-09-22 Created: 2017-09-22 Last updated: 2018-06-26Bibliographically approved
Ståhl, M., Berghel, J. & Frodeson, S. (2016). Additives for wood fuel pellet production - A win, win, win situation. In: : . Paper presented at 6th International Symposium "Energy challenges & mechanics - towards a big picture", Inverness, Scotland. 14-18 august 2016.
Open this publication in new window or tab >>Additives for wood fuel pellet production - A win, win, win situation
2016 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

The production and use of wood-fuel pellets, preferably made from sawdust or shavings, have increased significantly worldwide in recent years. If wood-fuel pellets should continue to be a successful biofuel at the energy market there are several factors to take into consideration. The pellet production industry already tries to reduce the production cost, since it is a low margin business. Further, it tries to produce pellets from a broader raw material base and at the same time satisfy the customer requirements while producing a sustainable product. The wood fuel pellet industry has the possibility to meet all these criteria; however, it also has the potential for improvements.

This work focuses on energy efficiency, technical aspects and environmental factors, i.e., the electricity consumption, the physical and mechanical properties of the pellets, and the CO

2 equivalent emitted during production, respectively. 20 various additives, with an admixture of up to 2 % (wt.), have been tested during wood fuel pellet production at Karlstad University. This work presents the benefits of using different additives in pellet production and the cost associated with different additives. The results shows that additive from the sea and from farmlands (algae, rape seed cake and grass) decrease the energy use in the pellet press but unfortunately also decrease the durability. Additives from wood (resins, lignin) and molasses increases the durability of the pellet but shows almost no or little change in electricity consumption. However, using starch grades, white sugar or spent sulphite liquor as an additive increases the mechanical properties while it decreases both the electricity consumption and the climate impact, hence a win-win-win situation. To justify the use of additives from a climate impact perspective in regions with an OECD European electricity mix or the Swedish electricity mix, the usage of additives from the rest products where the CO2 equivalent emissions are allocated to the main product are crucial.

In conclusion, it is necessary to do research that systematically investigates the consequences of using additives for wood fuel pellets to continuously be a successful biofuel at the energy market

National Category
Energy Engineering Energy Systems Bioenergy
Identifiers
urn:nbn:se:kau:diva-63906 (URN)
Conference
6th International Symposium "Energy challenges & mechanics - towards a big picture", Inverness, Scotland. 14-18 august 2016
Available from: 2017-09-22 Created: 2017-09-22 Last updated: 2018-07-09Bibliographically approved
Stahl, M., Berghel, J. & Granstrom, K. (2016). Improvement of Wood Fuel Pellet Quality Using Sustainable Sugar Additives. BioResources, 11(2), 3373-3383
Open this publication in new window or tab >>Improvement of Wood Fuel Pellet Quality Using Sustainable Sugar Additives
2016 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 11, no 2, p. 3373-3383Article in journal (Refereed) Published
Abstract [en]

The global production and use of wood fuel pellets has increased significantly in recent years. The raw material and the energy required to dry it are the main production costs. Therefore, it is crucial to minimize energy consumption, production costs, and the environmental impact associated with wood pellets. However, these changes should not negatively affect the quality of the pellets. One way to achieve these goals is to use additives. This work investigates how different types of sugar additives affect both the energy needed by the pellet press and the durability and oxidation of the produced pellets. When sugar was used as an additive, the energy use was practically unaffected. When molasses and SSL were added, a small decrease in energy use was observed (6 to 8%) for admixtures up to 1 wt.%; however, when more molasses was added, the energy use increased. Using these additives increased the bulk density (7 to 15 %) and durability (10 to 20 %) of the pellets. The storage of the pellets also caused a small increase in durability (1 to 3 %). Volatile organic compounds were produced as oxidation peaks within the first two months of storage; thereafter, the peaks tapered off.

Keywords
Wood fuel pellet, Additives, Molasses, White sugar, Spent sulphite liquor, Energy efficiency, Durability, Storage
National Category
Paper, Pulp and Fiber Technology
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-44549 (URN)000375786700031 ()
Available from: 2016-08-04 Created: 2016-08-04 Last updated: 2017-12-06Bibliographically approved
Ståhl, M., Berghel, J. & Granström, K. (2015). Improvement of Wood Fuel Pellets Quality Using Sustainable Sugar Additives. In: Proceedings of ECOS 2015 – The 28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems: . Paper presented at The 28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, June 30 – July 3 2015, Pau, France (pp. 1-8). Pau, France
Open this publication in new window or tab >>Improvement of Wood Fuel Pellets Quality Using Sustainable Sugar Additives
2015 (English)In: Proceedings of ECOS 2015 – The 28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Pau, France, 2015, p. 1-8Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Pau, France: , 2015
Series
Proceedings of: The International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ISSN 2175-5418
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-39071 (URN)978-2-9555539-0-9 (ISBN)
Conference
The 28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, June 30 – July 3 2015, Pau, France
Available from: 2016-01-19 Created: 2016-01-19 Last updated: 2017-10-30Bibliographically approved
Ståhl, M., Berghel, J. & Williams, H. (2014). Sustainable improvements in the wood fuel pellet chain. In: The Sustainable Energy and Environmental Protection: . Paper presented at SEEP 2014 - The International conference on Sustainable Energy and Environmental Protection, November 23-25 2014, The British University in Dubai.
Open this publication in new window or tab >>Sustainable improvements in the wood fuel pellet chain
2014 (English)In: The Sustainable Energy and Environmental Protection, 2014Conference paper, Published paper (Refereed)
Abstract [en]

A path towards sustainability should include growth with sustainable means such as the concept of Bioeconomy. The use of renewable resources for bioenergy should be performed to support sustainable development; however, biomass is made of limited resources and must be used efficiently and with a low environmental impact. The wood fuel pellet industry has the possibility to meet these criteria, but also has the potential for improvements. Earlier work on wood fuel pellet production has concluded that using oxidised cornstarch as an additive during pellet production decreases the energy used and also produces pellets with high durability. This work presents how additives such as cornstarch and molasses, affect the electricity use of the pellet press and also affect the emission of CO2 eq. from wood fuel pellet production. The results are presented for two different locations of the pellet plant, since the results will depend on how the electricity used is produced, e.g. using more or less renewable or fossil fuels in the electricity mix. 

Keywords
Additive, Carbon Dioxide Equivalents, Energy use, Pellet production, Durability
National Category
Engineering and Technology
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-34805 (URN)
Conference
SEEP 2014 - The International conference on Sustainable Energy and Environmental Protection, November 23-25 2014, The British University in Dubai
Available from: 2014-12-16 Created: 2014-12-16 Last updated: 2016-04-27Bibliographically approved
Ståhl, M., Berghel, J., Frodeson, S. & Renström, R. (2013). Energy reduction in wood-fuel pellet production. Forest bioenergy review, 4(19), 6
Open this publication in new window or tab >>Energy reduction in wood-fuel pellet production
2013 (English)In: Forest bioenergy review, ISSN 2045-8614, Vol. 4, no 19, p. 6-Article in journal (Other academic) Published
Place, publisher, year, edition, pages
UK: K V J Enterprises, 2013
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-34916 (URN)
Available from: 2015-01-15 Created: 2015-01-15 Last updated: 2018-04-16Bibliographically approved
Ståhl, M. (2013). Minska energianvändningen i pelletspressen och öka pelletskvaliteten. Paper presented at Pellets 2013, 29-30 januari i Falun, Sverige.
Open this publication in new window or tab >>Minska energianvändningen i pelletspressen och öka pelletskvaliteten
2013 (Swedish)Conference paper, Oral presentation only (Other academic)
Abstract [en]

The wood fuel pellet industry demands energy efficient solutions for their production since these not only save energy but also money. One way of achieving this is to use additives. Choosing the right additive can save money but also increase the quality of the pellets, a win win situation. In this work, it is investigated how different kind of additives affect the energy use of the pelletizing equipment and also how it affects the durability of pellets. The best results were achieved using oxidized cornstarch as an additive during pellet production, it not only decreases the energy used the most but also produce the pellets with highest durability.

National Category
Engineering and Technology
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-26905 (URN)
Conference
Pellets 2013, 29-30 januari i Falun, Sverige
Available from: 2013-04-11 Created: 2013-04-11 Last updated: 2016-05-26Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2528-4399

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