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Alkali enhanced biomass gasification with in situ S capture and novel syngas cleaning: Part 1: Gasifier performance
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. IVL Swedish Environmental Research Institute, Climate & Sustainable Cities.ORCID iD: 0000-0003-1806-4187
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-0453-0450
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-0200-9960
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
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2018 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 157, p. 96-105Article in journal (Refereed) Published
Abstract [en]

Previous research shows that alkali addition in entrained flow biomass gasification can increase char conversion and decrease tar and soot formation through catalysis. This paper investigates two other potential benefits of alkali addition: increased slag flowability and in situ sulfur capture.

Thermodynamic equilibrium calculations show that addition of 2–8% alkali catalyst to biomass completely changes the chemical domain of the gasifier slag phase to an alkali carbonate melt with low viscosity. This can increase feedstock flexibility and improve the operability of an entrained flow biomass gasification process. The alkali carbonate melt also leads to up to 90% sulfur capture through the formation of alkali sulfides. The resulting reduced syngas sulfur content can potentially simplify gas cleaning required for catalytic biofuel production.

Alkali catalyst recovery and recycling is a precondition for the economic feasibility of the proposed process and is effected through a wet quench. It is shown that the addition of Zn for sulfur precipitation in the alkali recovery loop enables the separation of S, Ca and Mg from the recycle. For high Si and Cl biomass feedstocks, an alternative separation technology for these elements may be required to avoid build-up.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 157, p. 96-105
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Energy Systems Energy Engineering
Research subject
Energy Engineering
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URN: urn:nbn:se:ltu:diva-68753DOI: 10.1016/j.energy.2018.05.097Scopus ID: 2-s2.0-85048465146OAI: oai:DiVA.org:ltu-68753DiVA, id: diva2:1206304
Note

Validerad;2018;Nivå 2;2018-06-25 (andbra)

Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-07-23Bibliographically approved

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Furusjö, ErikMa, ChunyanJi, XiaoyanCarvalho, LaraLundgren, JoakimWetterlund, Elisabeth

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