Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 77) Show all publications
Henriksson, L., Frodeson, S., Berghel, J., Andersson, S. & Ohlson, M. (2019). Bioresources for Sustainable Pellet Production in Zambia: Twelve Biomasses Pelletized at Different Moisture Content. BioResources, 14(2), 2550-2575
Open this publication in new window or tab >>Bioresources for Sustainable Pellet Production in Zambia: Twelve Biomasses Pelletized at Different Moisture Content
Show others...
2019 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 14, no 2, p. 2550-2575Article in journal (Refereed) Published
Abstract [en]

The use of charcoal and firewood for cooking is common in Zambia,and its utilization is suchthat the deforestation rate is high, energy utilization is low, and unfavorable cooking methods lead to high death rates due to indoor air pollution mainly from particulate matter and carbon monoxide.Byusing an alternative cooking method, such as pellet stoves, it is possible to offer a sustainable solution, provided that sustainable pelletproduction can be achieved. In this study, 12different available biomaterials were pelletizedina single pellet unitto investigate their availability as raw materials for pellet production in Zambia. The study showedthat sicklebush and pigeon pea generatedthe same pelleting properties correlated withcompression and frictionand that both materials showedlow moisture uptake. The study also identifiedtwo groups of materials that broadenedthe raw material base and helpedto achieve sustainable pellet production.Group 1consisted of materials with equal pelletingabilities (miombo, peanut shell, pigeon pea,and sicklebush) andGroup 2 consistedof materialsthat showed low impact of varying moisture content(eucalyptus, miombo, peanut shell, pigeon pea, and sicklebush). The hardest pellet was made from Tephrosia, which wasfollowed by Gliricidia.

Place, publisher, year, edition, pages
North Carolina: North Carolina State University, 2019
Keywords
Biomass pellets, Single pellet press, Densification, Backpressure, Chemical composition
National Category
Paper, Pulp and Fiber Technology Energy Systems Other Environmental Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-71412 (URN)
Available from: 2019-03-02 Created: 2019-03-02 Last updated: 2019-03-29Bibliographically approved
Frodeson, S., Henriksson, G. & Berghel, J. (2019). Effects of moisture content during densification of biomass pellets, focusing on polysaccharide substances. Biomass and Bioenergy, 122, 322-330
Open this publication in new window or tab >>Effects of moisture content during densification of biomass pellets, focusing on polysaccharide substances
2019 (English)In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 122, p. 322-330Article in journal (Refereed) Published
Abstract [en]

In this study, we pelletized four different pure polysaccharides represented cellulose - Avicel, hemicelluloses - locus bean gum mannan and beech xylan and other polysaccharides - apple pectin, and three woods - pine, spruce and beech. All were pelletized at 100° in a single pellet press unit with different level of moisture content from 0 to 15%. The maximal friction force and work required for compression and friction was analyzed together with the pellet density and hardness. The results showed that xylan pellets completely changed in color at 10% moisture content, and this also occurred to some extent with pectin pellets. The color of both Avicel and locus bean gum pellets were not affected at all. During compression, the results showed that water does not affect compression up to 5 kN, while above 5 kN water decreases the energy need for densification of Avicel, locus bean gum and woods. Above 5 kN the energy needs for compressing xylan and pectin increases with increased moisture content. The hardest pellets were produced from Avicel, while locus bean gum produced the weakest pellets. The study concludes that there is a significant difference in how water affects the two hemicelluloses, glucomannan and xylan, during densification.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Wood pellets, densification, cellulose, hemicellulose, xylan, glucomannan
National Category
Paper, Pulp and Fiber Technology Bioenergy Energy Systems
Research subject
Environmental and Energy Systems; Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-71411 (URN)10.1016/j.biombioe.2019.01.048 (DOI)000459461800034 ()
Note

APC betald 2019.

Available from: 2019-03-02 Created: 2019-03-02 Last updated: 2019-03-22Bibliographically approved
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
Anukam, A., Okoh, O., Mamphweli, S. & Berghel, J. (2018). A comparative analysis of the gasification performances of torrefied and untorrefied bagasse: Influence of feed size, gasifier design and operating variables on gasification efficiency. International Journal of Engineering & Technology, 7(2), 859-867
Open this publication in new window or tab >>A comparative analysis of the gasification performances of torrefied and untorrefied bagasse: Influence of feed size, gasifier design and operating variables on gasification efficiency
2018 (English)In: International Journal of Engineering & Technology, E-ISSN 2227-524X, Vol. 7, no 2, p. 859-867Article in journal (Refereed) Published
Abstract [en]

This study conducted a comparative assessment of the gasification performances of torrefied and untorrefied bagasse with emphasis on feed size, gasifier design and operating conditions that would influence gasification efficiency. Torrefaction greatly improved the characteristics of bagasse and had significant impact on its gasification performance. The gasifier design parameters studied were throat angle and throat diameter. Temperature of input air and feed input were the gasifier operating conditions examined in the course of the gasification processes of both torrefied and untorrefied bagasse. These parameters were considered the most critical operating parameters that affect gasifier performance and, correlation between the parameters was established in the course of gasification. The results obtained showed higher gasification efficiency for torrefied bagasse in comparison to untorrefied bagasse under varied conditions of gasification, which was attributed mainly to changes in the characteristics of the torrefied material.  

Place, publisher, year, edition, pages
Science Publishing Corporation, 2018
Keywords
Biomass, Sugarcane Bagasse, Torrefaction, Gasification, Efficiency, Computer Simulation.
National Category
Mechanical Engineering Civil Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-70365 (URN)10.14419/ijet.v7i2.8489 (DOI)
Available from: 2018-11-29 Created: 2018-11-29 Last updated: 2018-12-13Bibliographically approved
Frodeson, S., Henriksson, G. & Berghel, J. (2018). Pelletizing pure biomass substances to investigate the mechanical properties and bonding mechanisms. BioResources, 13(1), 1202-1222
Open this publication in new window or tab >>Pelletizing pure biomass substances to investigate the mechanical properties and bonding mechanisms
2018 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 13, no 1, p. 1202-1222Article in journal (Refereed) Published
Abstract [en]

Solid fuel for heating is an important product, and for sustainability reasons, it is important to replace nonrenewable fuels with renewable resources. This entails that the raw material base for pellet production has to increase. A broader spectrum of materials for pelleting involves variation in biomass substances. This variation, due to lack of knowledge, limits the possibilities to increase the pellet production using new raw materials. In this study, pellets were produced with a single pellet press from 16 different pure biomass substances representing cellulose, hemicellulose, other polysaccharides, protein, lignin, and extractives, and five different wood species, representing softwoods and hardwoods. All pellets were analyzed for the work required for compression and friction, maximum force needed to overcome the backpressure, pellet hardness, solid density, and moisture uptake. The results showed that the hardest pellets were produced from the group of celluloses, followed by rice xylan and larch arbinogalactan. The weakest pellets were from the group of mannans. Conclusions are that the flexible polysaccharides have a greater impact on the pelletizing process than previously known, and that the differences between xylan and glucomannan may explain the difference in the behavior of pelletizing softwoods and hardwoods.

Place, publisher, year, edition, pages
North Carolina State University, 2018
Keywords
Biomass pellets, Renewable energy, Single pellet press, Wood pellets, Biomass, Cellulose, Fuels, Hardwoods, Polysaccharides, Presses (machine tools), Softwoods, Wood, Bonding mechanism, Non-renewable fuels, Pellet hardness, Pellet production, Renewable energies, Renewable resource, Wood pellet, Pelletizing
National Category
Energy Systems Paper, Pulp and Fiber Technology
Research subject
Environmental and Energy Systems; Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-66400 (URN)10.15376/biores.13.1.1202-1222 (DOI)2-s2.0-85041345528 (Scopus ID)
Note

Export Date: 16 February 2018; Article; Correspondence Address: Frodeson, S.; Environmental and Energy Systems, Department of Engineering and Chemical Science, Karlstad University, KarlstadSweden; email: Stefan.Frodeson@kau.se; References: Ahn, B.J., Chang, H.-S., Lee, S.M., Choi, D.H., Cho, S.T., Han, G.-S., Yang, I., 'Effect of binders on the durability of wood pellets fabricated from Larix kaemferi C. and Liriodendron tulipifera L. sawdust, ' (2014) Renew. Energ, 62, pp. 18-23; Barsett, H., Ebringerová, A., Harding, S., Heinze, T., Hromádková, Z., Muzzarelli, C., Muzzraelli, R., El Seoud, O., (2005) Polysaccharides I: Structure, , Characterisation and Use, Springer Science & Business Media, Berlin, Germany; Berghel, J., Frodeson, S., Granström, K., Renström, R., Ståhl, M., Nordgren, D., Tomani, P., 'The effects of kraft lignin additives on wood fuel pellet quality, energy use and shelf life, ' (2013) Fuel Process. Technol, 112, pp. 64-69; Berglund, J., Angles d'Ortoli, T., Vilaplana, F., Widmalm, G., Bergenstråhle-Wohlert, M., Lawoko, M., Henriksson, G., Wohlert, J., 'A molecular dynamics study of the effect of glycosidic linkage type in the hemicellulose backbone on the molecular chain flexibility, ' (2016) The Plant Journal, 88 (1), pp. 56-70; Braccini, I., Pérez, S., 'Molecular basis of Ca2+-induced gelation in alginates and pectins: The egg-box model revisited, ' (2001) Biomacromolecules, 2 (4), pp. 1089-1096; Christiansen, A.W., 'How overdrying wood reduces its bonding to phenol-formaldehyde adhesives: A critical review of the literature. Part II, Chemical reactions, ' (1991) Wood Fiber Sci, 23 (1), pp. 69-84; Deshpande, R., (2016) The Initial Phase of Sodium Sulfite Pulping of Softwood: A Comparison of Different Pulping Options, , Doctoral Thesis, Karlstad University, Karlstad, Sweden; (2012) Innovating for Sustainable Growth: A Bioeconomy for Europe, , European Union, Brussels, Belgium; Fengel, D., Wegener, G., (1989) Wood: Chemistry, , Ultrastructure, Reactions, 2nd Ed., Walter de Gruyter, Berlin; Grover, P., Mishra, S., (1996) Biomass Briquetting: Technology and Practices, , (Field Document No. 46) Food and Agriculture Organization of the United Nations, Rome, Italy; Holm, J.K., Henriksen, U.B., Hustad, J.E., Sørensen, L.H., 'Toward an understanding of controlling parameters in softwood and hardwood pellets production, ' (2006) Energ. Fuel, 20 (6), pp. 2686-2694; Hse, C.-Y., Kuo, M.-L., 'Influence of extractives on wood gluing and finishing-A review, ' (1988) Forest Prod. J, 38 (1), pp. 52-56; Irvine, G., 'The glass transitions of lignin and hemicellulose and their measurement by differential thermal analysis, ' (1984) Tappi J, 67 (5), pp. 118-121; Kaliyan, N., Morey, R.V., 'Natural binders and solid bridge type binding mechanisms in briquettes and pellets made from corn stover and switchgrass, ' (2010) Bioresource Technol, 101 (3), pp. 1082-1090; Kaliyan, N., Morey, R.V., 'Factors affecting strength and durability of densified biomass products, ' (2009) Biomass Bioenerg, 33 (3), pp. 337-359; Kuokkanen, M.J., Vilppo, T., Kuokkanen, T., Stoor, T., Niinimäki, J., 'Additives in wood pellet production-A pilot-scale study of binding agent usage, ' (2011) BioResources, 6 (4), pp. 4331-4355; Lawoko, M., Berggren, R., Berthold, F., Henriksson, G., Gellerstedt, G., 'Changes in the lignin-carbohydrate complex in softwood kraft pulp during kraft and oxygen delignification, ' (2004) Holzforschung, 58 (6), pp. 603-610; Mani, S., Tabil, L.G., Sokhansanj, S., 'Compaction of biomass grinds-An overview of compaction of biomass grinds, ' (2003) Powder Handling and Processing, 15 (3), pp. 160-168; Mani, S., Tabil, L.G., Sokhansanj, S., 'Effects of compressive force, particle size and moisture content on mechanical properties of biomass pellets from grasses, ' (2006) Biomass Bioenerg, 30 (7), pp. 648-654; Mišljenovic, N., Colovic, R., Vukmirovic, D., Brlek, T., Bringas, C.S., 'The effects of sugar beet molasses on wheat straw pelleting and pellet quality. A comparative study of pelleting by using a single pellet press and a pilot-scale pellet press, ' (2016) Fuel Process. Technol, 144, pp. 220-229; Nguyen, Q.N., Cloutier, A., Achim, A., Stevanovic, T., 'Effect of process parameters and raw material characteristics on physical and mechanical properties of wood pellets made from sugar maple particles, ' (2015) Biomass Bioenerg, 80, pp. 338-349; Nielsen, N.P.K., (2009) Importance of Raw Material Properties in Wood Pellet Production: Effects of Differences in Wood Properties for the Energy Requirements of Pelletizing and the Pellet Quality, , Ph.D. Dissertation, University of Copenhagen, Copenhagen, Denmark; Nielsen, N.P.K., Gardner, D.J., Felby, C., 'Effect of extractives and storage on the pelletizing process of sawdust, ' (2010) Fuel, 89 (1), pp. 94-98; Nielsen, N.P.K., Gardner, D.J., Poulsen, T., Felby, C., 'Importance of temperature, moisture content, and species for the conversion process of wood residues into fuel pellets, ' (2009) Wood Fiber Sci, 41 (4), p. 414; Nielsen, N.P.K., Holm, J.K., Felby, C., 'Effect of fiber orientation on compression and frictional properties of sawdust particles in fuel pellet production, ' (2009) Energ. Fuel, 23 (6), pp. 3211-3216; Pauly, M., Keegstra, K., 'Cell-wall carbohydrates and their modification as a resource for biofuels, ' (2008) The Plant Journal, 54 (4), pp. 559-568; Pettersen, R.C., 'The chemical composition of wood, ' (1984) The Chemistry of Solid Wood, Advances in Chemistry Series, 207, pp. 57-126. , in: R. M. Rowell (ed.) Washington DC, American Chemical Society; Puig-Arnavat, M., Shang, L., Sárossy, Z., Ahrenfeldt, J., Henriksen, U.B., 'From a single pellet press to a bench scale pellet mill-Pelletizing six different biomass feedstocks, ' (2016) Fuel Process. Technol, 142, pp. 27-33; Ramírez-Gómez, A., 'Research needs on biomass characterization to prevent handling problems and hazards in industry, ' (2016) Particul. Sci. Technol, 34 (4), pp. 432-441; Roffael, E., 'Significance of wood extractives for wood bonding, ' (2016) Applied Microbiology and Biotechnology, 100 (4), pp. 1589-1596; Rumpf, H., 'The strength of granules and agglomerate, ' (1962) Agglomeration, pp. 379-418. , W. A. Knepper (ed.), Interscience Publishers, New York, NY; Rydholm, S.A., (1985) Pulping Processes, , Robert Krieger Publishing Co., Inc., Malabar, FL 32950; Samuelsson, R., Larsson, S.H., Thyrel, M., Lestander, T.A., 'Moisture content and storage time influence the binding mechanisms in biofuel wood pellets, ' (2012) Appl. Energ, 99, pp. 109-115; Samuelsson, R., Thyrel, M., Sjöström, M., Lestander, T.A., 'Effect of biomaterial characteristics on pelletizing properties and biofuel pellet quality, ' (2009) Fuel Process. Technol, 90 (9), pp. 1129-1134; (2009) 'Solid biofuels-Determination of moisture content-Oven dry method-Part 1: Total moisture-Reference method, ', , Swedish Standards Institute, Stockholm, Sweden; Stelte, W., Holm, J.K., Sanadi, A.R., Barsberg, S., Ahrenfeldt, J., Henriksen, U.B., 'Fuel pellets from biomass: The importance of the pelletizing pressure and its dependency on the processing conditions, ' (2011) Fuel, 90 (11), pp. 3285-3290; Stelte, W., Holm, J.K., Sanadi, A.R., Barsberg, S., Ahrenfeldt, J., Henriksen, U.B., 'A study of bonding and failure mechanisms in fuel pellets from different biomass resources, ' (2011) Biomass Bioenerg, 35 (2), pp. 910-918; Stelte, W., Sanadi, A.R., Shang, L., Holm, J.K., Ahrenfeldt, J., Henriksen, U.B., 'Recent developments in biomass pelletization-A review, ' (2012) BioResources, 7 (3), pp. 4451-4490; Ståhl, M., Berghel, J., Frodeson, S., Granström, K., Renström, R., 'Effects on pellet properties and energy use when starch is added in the wood-fuel pelletizing process, ' (2012) Energ. Fuel, 26 (3), pp. 1937-1945; Ståhl, M., Berghel, J., Granström, K., 'Improvement of wood fuel pellet quality using sustainable sugar additives, ' (2016) BioResources, 11 (2), pp. 3373-3383; Tarasov, D., Shahi, C., Leitch, M., 'Effect of additives on wood pellet physical and thermal characteristics: A review, ' (2013) ISRN Forestry, 2013, pp. 1-6; Vassilev, S.V., Baxter, D., Andersen, L.K., Vassileva, C.G., 'An overview of the chemical composition of biomass, ' (2010) Fuel, 89 (5), pp. 913-933; Whittaker, C., Shield, I., 'Factors affecting wood, energy grass and straw pellet durability-A review, ' (2017) Renew. Sust. Energ. Rev, 71, pp. 1-11

Available from: 2018-02-16 Created: 2018-02-16 Last updated: 2018-04-16
Mattsson, L., Williams, H. & Berghel, J. (2018). Waste of fresh fruit and vegetables at retailers in Sweden: Measuring and calculation of mass, economic cost and climate impact. Resources, Conservation and Recycling, 130, 118-126
Open this publication in new window or tab >>Waste of fresh fruit and vegetables at retailers in Sweden: Measuring and calculation of mass, economic cost and climate impact
2018 (English)In: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 130, p. 118-126Article in journal (Refereed) Published
Abstract [en]

Food waste is a significant problem for environmental, economic and food security reasons. The retailer, food service and consumers have been recognised as the parts of the food supply chain where the possibility of reducing food waste is greatest in industrialised countries. In this study, primary data on fresh fruit and vegetables (FFV) waste collected through direct measurements in three large retail stores in Sweden were analysed from the perspectives of wasted mass, economic cost and climate impact. A method of measuring and calculating the economic cost of FFV waste was developed and includes the cost of wasted produce, the cost of personnel time for waste management and the cost of waste collection and disposal. The results show that seven FFV categories, which have been termed "hotspot categories", contributed to the majority of the waste, both in terms of wasted mass, economic cost and climate impact. The "hotspot categories" are apple, banana, grape, lettuce, pear, sweet pepper, and tomato. The cost benefit analysis conducted showed that it is economically wise to invest in more working time for employees in waste management to accomplish a reduction of wasted mass and climate impact without an economic loss for the store. These results are relevant for supporting the implementation of policies and initiatives aimed at food waste reduction at retail level.

National Category
Environmental Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-66185 (URN)10.1016/j.resconrec.2017.10.037 (DOI)000423005400016 ()
Available from: 2018-02-09 Created: 2018-02-09 Last updated: 2018-04-05Bibliographically approved
Ottosson, A., Nilsson, L. & Berghel, J. (2017). A mathematical model of heat and mass transfer in Yankee drying of tissue. Drying Technology, 35(3), 323-334
Open this publication in new window or tab >>A mathematical model of heat and mass transfer in Yankee drying of tissue
2017 (English)In: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 35, no 3, p. 323-334Article in journal (Refereed) Published
Abstract [en]

Final dewatering in the production of dry creped tissue is performed by Yankee drying, which includes hot pressing followed by simultaneous contact and impingement drying. The present study models Yankee drying and compares simulation results to the data obtained from trials on a pilot tissue machine. It advances models published previously by the representations developed for the transport of heat in the pressing stage and for the heat transfer involved in the dehydration of the cylinder coating spray. The model predicts an average specific drying rate within 4% in the range of the experimental data used.

Place, publisher, year, edition, pages
Taylor & Francis, 2017
Keywords
Heat and mass transfer, mathematical model, tissue drying
National Category
Energy Engineering
Identifiers
urn:nbn:se:kau:diva-63896 (URN)10.1080/07373937.2016.1170697 (DOI)000395033700006 ()
Available from: 2017-09-22 Created: 2017-09-22 Last updated: 2018-06-25Bibliographically 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
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-9707-8896

Search in DiVA

Show all publications