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Reduction of tar and soot formation from entrained-flow gasification of woody biomass by alkali impregnation
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0001-6081-5736
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-8235-9839
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2017 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 31, no 5, 5104-5110 p.Article in journal (Refereed) Published
Abstract [en]

Tar and soot in product gas have been a major technical challenge toward the large-scale industrial installation of biomass gasification. This study aims at demonstrating that the formation of tar and soot can be reduced simultaneously using the catalytic activity of alkali metal species. Pine sawdust was impregnated with aqueous K2CO3 solution by wet impregnation methods prior to the gasification experiments. Raw and alkali-impregnated sawdust were gasified in a laminar drop-tube furnace at 900–1400 °C in a N2–CO2 mixture, because that creates conditions representative for an entrained-flow gasification process. At 900–1100 °C, char, soot and tar decreased with the temperature rise for both raw and alkali-impregnated sawdust. The change in tar and soot yields indicated that potassium inhibited the growth of polycyclic aromatic hydrocarbons and promoted the decomposition of light tar (with 1–2 aromatic rings). The results also indicated that the catalytic activity of potassium on tar decomposition exists in both solid and gas phases. Because alkali salts can be recovered from product gas as an aqueous solution, alkali-catalyzed gasification of woody biomass can be a promising process to produce clean product gas from the entrained-flow gasification process at a relatively low temperature.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 31, no 5, 5104-5110 p.
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-63149DOI: 10.1021/acs.energyfuels.6b03480ISI: 000402023600055Scopus ID: 2-s2.0-85020552211OAI: oai:DiVA.org:ltu-63149DiVA: diva2:1090831
Note

Validerad;2017;Nivå 2;2017-05-30 (rokbeg)

Available from: 2017-04-25 Created: 2017-04-25 Last updated: 2017-06-30Bibliographically approved

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Umeki, KentaroHäggström, GustavBach-Oller, AlbertKirtania, KawnishFurusjö, Erik
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CiteExportLink to record
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