Slag Formation During Combustion of Biomass Fuels with Low Phosphorous Content

Slag and ash deposition problems have more than occasionally been observed in biomass fueled plants in general and especially in pellet fired plants. These problems can lead to reduced accessibility as well as performance of the combustion appliances. Slag formation including ash transformation mech...

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Main Authors: Öhman, M., Gilbe, C., Nyström, I., Hedman, H., Boström, D., Boman, C., Backman, R.
Format: Conference Object
Language:English
Published: ETA-Florence Renewable Energies 2011
Subjects:
Online Access:https://dx.doi.org/10.5071/19theubce2011-vp2.1.19
http://www.etaflorence.it/proceedings?detail=6721
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spelling ftdatacite:10.5071/19theubce2011-vp2.1.19 2023-05-15T17:09:17+02:00 Slag Formation During Combustion of Biomass Fuels with Low Phosphorous Content Öhman, M. Gilbe, C. Nyström, I. Hedman, H. Boström, D. Boman, C. Backman, R. 2011 application/pdf https://dx.doi.org/10.5071/19theubce2011-vp2.1.19 http://www.etaflorence.it/proceedings?detail=6721 en eng ETA-Florence Renewable Energies Biomass Text Conference paper article-journal ScholarlyArticle 2011 ftdatacite https://doi.org/10.5071/19theubce2011-vp2.1.19 2021-11-05T12:55:41Z Slag and ash deposition problems have more than occasionally been observed in biomass fueled plants in general and especially in pellet fired plants. These problems can lead to reduced accessibility as well as performance of the combustion appliances. Slag formation including ash transformation mechanisms, measures for prevention and prediction during combustion of biomass fuels has been studied by the research groups at Luleå University of Technology, Umeå University and Energy Technology Center for over one decade now. Several (about 40) different biomass fuels/fuel mixtures have been studied and many different fuel additives/co-combustion fuels have been used to combat slag formation. About 20 scientific papers and 10 technical reports have been published by the research groups within the topic of slag formation during combustion of biomass fuels with low phosphorus content. The objective of the present work was to summarize the general experiences and conclusions of our research within the area of slag formation during combustion of fuels with low phosphorus and varying silicon content. Silicon rich fuels, i.e. fuel ash dominated by silicate-alkali chemistry (e.g. straw fuels), generally shows relatively high slagging tendencies. Exceptions to these general trends exists i.e. fuels with very high Si/K-ratios. Wood derived fuels with a relatively low inherent silicon content shows low or relatively moderate slagging tendencies. However, severe contamination of sand material to woody biomass fuels may greatly enhance the slagging tendencies. Fuel additive addition to problematic woody biomass and straw significantly reduces the slagging tendencies. When adding limestone and kaolin to the problematic wood and straw fuels the composition of the formed slag is changed from relatively low temperature melting silicates to high temperature melting silicates and oxides. The standard ash fusion tests and chemical equilibrium calculations gives useful qualitatively information of the slagging tendencies. However, both methods must be further improved before quantitatively results can be used. The use of different fuel indexes to predict the slagging tendencies could be an interesting option. More research within this field is, however, needed. : Proceedings of the 19th European Biomass Conference and Exhibition, 6-10 June 2011, Berlin, Germany, pp. 1267-1270 Conference Object Luleå Luleå Luleå DataCite Metadata Store (German National Library of Science and Technology)
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language English
topic Biomass
spellingShingle Biomass
Öhman, M.
Gilbe, C.
Nyström, I.
Hedman, H.
Boström, D.
Boman, C.
Backman, R.
Slag Formation During Combustion of Biomass Fuels with Low Phosphorous Content
topic_facet Biomass
description Slag and ash deposition problems have more than occasionally been observed in biomass fueled plants in general and especially in pellet fired plants. These problems can lead to reduced accessibility as well as performance of the combustion appliances. Slag formation including ash transformation mechanisms, measures for prevention and prediction during combustion of biomass fuels has been studied by the research groups at Luleå University of Technology, Umeå University and Energy Technology Center for over one decade now. Several (about 40) different biomass fuels/fuel mixtures have been studied and many different fuel additives/co-combustion fuels have been used to combat slag formation. About 20 scientific papers and 10 technical reports have been published by the research groups within the topic of slag formation during combustion of biomass fuels with low phosphorus content. The objective of the present work was to summarize the general experiences and conclusions of our research within the area of slag formation during combustion of fuels with low phosphorus and varying silicon content. Silicon rich fuels, i.e. fuel ash dominated by silicate-alkali chemistry (e.g. straw fuels), generally shows relatively high slagging tendencies. Exceptions to these general trends exists i.e. fuels with very high Si/K-ratios. Wood derived fuels with a relatively low inherent silicon content shows low or relatively moderate slagging tendencies. However, severe contamination of sand material to woody biomass fuels may greatly enhance the slagging tendencies. Fuel additive addition to problematic woody biomass and straw significantly reduces the slagging tendencies. When adding limestone and kaolin to the problematic wood and straw fuels the composition of the formed slag is changed from relatively low temperature melting silicates to high temperature melting silicates and oxides. The standard ash fusion tests and chemical equilibrium calculations gives useful qualitatively information of the slagging tendencies. However, both methods must be further improved before quantitatively results can be used. The use of different fuel indexes to predict the slagging tendencies could be an interesting option. More research within this field is, however, needed. : Proceedings of the 19th European Biomass Conference and Exhibition, 6-10 June 2011, Berlin, Germany, pp. 1267-1270
format Conference Object
author Öhman, M.
Gilbe, C.
Nyström, I.
Hedman, H.
Boström, D.
Boman, C.
Backman, R.
author_facet Öhman, M.
Gilbe, C.
Nyström, I.
Hedman, H.
Boström, D.
Boman, C.
Backman, R.
author_sort Öhman, M.
title Slag Formation During Combustion of Biomass Fuels with Low Phosphorous Content
title_short Slag Formation During Combustion of Biomass Fuels with Low Phosphorous Content
title_full Slag Formation During Combustion of Biomass Fuels with Low Phosphorous Content
title_fullStr Slag Formation During Combustion of Biomass Fuels with Low Phosphorous Content
title_full_unstemmed Slag Formation During Combustion of Biomass Fuels with Low Phosphorous Content
title_sort slag formation during combustion of biomass fuels with low phosphorous content
publisher ETA-Florence Renewable Energies
publishDate 2011
url https://dx.doi.org/10.5071/19theubce2011-vp2.1.19
http://www.etaflorence.it/proceedings?detail=6721
genre Luleå
Luleå
Luleå
genre_facet Luleå
Luleå
Luleå
op_doi https://doi.org/10.5071/19theubce2011-vp2.1.19
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