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Ash Formation in Pilot-Scale Pressurized Entrained-Flow Gasification of Bark and a Bark/Peat Mixture
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
Energy Technology and Thermal Process Chemistry, Department of Applied Physics and Electronics, Umeå University.
SP Energy Technology Center AB.
SP Energy Technology Center AB.
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Number of Authors: 8
2016 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 30, no 12, 10543-10554 p.Article in journal (Refereed) Published
Abstract [en]

Pressurized entrained-flow gasification (PEFG) of bark and a bark/peat mixture (BPM) was carried out in a pilot-scale reactor (600 kWth, 7 bar(a)) with the objective of studying ash transformations and behaviors. The bark fuel produced a sintered but nonflowing reactor slag, while the BPM fuel produced a flowing reactor slag. Si was enriched within these slags compared to their original fuel ash compositions, especially in the bark campaign, which indicated extensive ash matter fractionation. Thermodynamically, the Si contents largely accounted for the differences in the predicted solidus/liquidus temperatures and melt formations of the reactor slags. Suspension flow viscosity estimations were in qualitative agreement with observations and highlighted potential difficulties in controlling slag flow. Quench solids from the bark campaign were mainly composed of heterogeneous particles resembling reactor fly ash particles, while those from the BPM campaign were flowing slags with likely chemical interactions with the wall refractory. Quench effluents and raw syngas particles were dominated by elevated levels of K that, along with other chemical aspects, indicated KOH(g) and/or K(g) were likely formed during PEFG. Overall, the results provide information toward development of woody biomass PEFG and indicate that detailed understanding of the ash matter fractionation behavior is essential.

Place, publisher, year, edition, pages
2016. Vol. 30, no 12, 10543-10554 p.
National Category
Energy Systems Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-61329DOI: 10.1021/acs.energyfuels.6b02222ISI: 000390072900057OAI: oai:DiVA.org:ltu-61329DiVA: diva2:1062968
Funder
Swedish Energy AgencyBio4Energy
Note

Validerad; 2017; Nivå 2; 2017-01-12 (andbra)

Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2017-01-12Bibliographically approved

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