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Ash formation during pilot-scale trials of pressurized entrained-flow gasification of woody biomass
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
Umeå universitet.
Umeå universitet.
Show others and affiliations
2012 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Deposits, ash samples and residues from pressurised entrained-flow gasification (PEFG) of stem wood, bark and rejected pulpwood have been characterised with SEM-EDS during trials in an O2-blown pilot-scale reactor. Global thermochemical equilibrium calculations based on the conditions inside the hot reactor were carried out to investigate the phase distribution of potassium as both a function of temperature and Si reactivity. Substantial deposit formations on the reactor probe were only evident in the trials with the woody fuels containing a higher ash content; i.e., experiments with pulpwood and bark. Of these, the deposits formed during gasification of the pulpwood fuel, likely to have been relatively highly contaminated, showed more hard and sintered material. The deposits/slag formed contained typical sand particles (e.g. quartz and feldspars) embedded in a silicate rich melt. The melt in the slag is dominated by silicon 40-55 mol%, aluminium ~15 mol% and calcium 10-20 mol%, with a further ~10 mol% consisting of alkali metals sodium and potassium. The preliminary results suggest that fuel contaminants (e.g., quartz and feldspars) may play a significant role in the slag formation process in entrained flow gasification of woody biomass fuels and that a significant share of the potassium is leaving the hot reactor as gaseous alkali species.

Place, publisher, year, edition, pages
2012.
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-28717Local ID: 29c86e4a-807e-4687-83ed-84c2bf145955OAI: oai:DiVA.org:ltu-28717DiVA: diva2:1001921
Conference
Impacts of Fuel Quality on Power Production and the Environment : 23/09/2012 - 27/09/2012
Note
Godkänd; 2012; 20121002 (ohmmar)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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CiteExportLink to record
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