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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.
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 1520-5029Article in journal (Refereed) Epub ahead of print
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 by utilizing 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 was gasified in a laminar drop tube furnace at 900–1400 °C in an N2-CO2 mixture, since that creates conditions representative for an entrained flow gasification process. At 900–1100 °C, char and tar decreased with temperature rise for both raw and alkali-impregnated sawdust while soot yield increased for raw sawdust and decreased for alkali impregnated sawdust. The change in tar and soot yields indicated that potassium inhibited the growth of polycyclic aromatic hydrocarbons (PAH) 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 both in solid and gas phases. Since 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 entrained flow gasification process at relatively low temperature.

Place, publisher, year, edition, pages
2017.
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-63149DOI: 10.1021/acs.energyfuels.6b03480OAI: oai:DiVA.org:ltu-63149DiVA: diva2:1090831
Available from: 2017-04-25 Created: 2017-04-25 Last updated: 2017-04-25

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Umeki, KentaroHäggström, GustavBach Oller, AlbertKirtania, KawnishFurusjö, Erik
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CiteExportLink to record
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Citation style
  • apa
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