Mapping the effects of potassium on fuel conversion in industrial-scale fluidized bed gasifiers and combustors

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Berdugo Vilches, Teresa,1985Chalmers tekniska högskola,Chalmers University of Technology (author)

Mapping the effects of potassium on fuel conversion in industrial-scale fluidized bed gasifiers and combustors

Article/chapterEnglish2021

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2021-11-16
MDPI AG,2021
electronicrdacarrier

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LIBRIS-ID:oai:research.chalmers.se:ec2fb744-c3ed-4e2f-96e8-caa60e6a50ca
https://doi.org/10.3390/catal11111380DOI
https://research.chalmers.se/publication/527144URI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype

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Potassium (K) is a notorious villain among the ash components found in the biomass, being the cause of bed agglomeration and contributing to fouling and corrosion. At the same time, K is known to have catalytic properties towards fuel conversion in combustion and gasification environments. Olivine (MgFe silicate) used as gasifier bed material has a higher propensity to form catalytically active K species than traditional silica sand beds, which tend to react with K to form stable and inactive silicates. In a dual fluidized bed (DFB) gasifier, many of those catalytic effects are expected to be relevant, given that the bed material becomes naturally enriched with ash elements from the fuel. However, a comprehensive overview of how enrichment of the bed with alkali affects fuel conversion in both parts of the DFB system is lacking. In this work, the effects of ash-enriched olivine on fuel conversion in the gasification and combustion parts of the process are mapped. The work is based on a dedicated experimental campaign in a Chalmers DFB gasifier, wherein enrichment of the bed material with K is promoted by the addition of a reaction partner, i.e., sulfur, which ensures K retention in the bed in forms other than inactive silicates. The choice of sulfur is based on its affinity for K under combustion conditions. The addition of sulfur proved to be an efficient strategy for capturing catalytic K in olivine particles. In the gasification part, K-loaded olivine enhanced the char gasification rate, decreased the tar concentration, and promoted the WGS equilibrium. In the combustion part, K prevented full oxidation of CO, which could be mitigated by the addition of sulfur to the cyclone outlet.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Kemiteknik Kemiska processer hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering Chemical Process Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Kemiteknik Annan kemiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering Other Chemical Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Industriell bioteknik Bioenergi hsv//swe
ENGINEERING AND TECHNOLOGY Industrial Biotechnology Bioenergy hsv//eng
Catalyst
Olivine
Tar
Combustion emissions
Dual fluidized bed
Combustor
Sulfur
Potassium
Gasifier

Added entries (persons, corporate bodies, meetings, titles ...)

Maric, Jelena,1983Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jelenam (author)
Thunman, Henrik,1970Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)heth (author)
Seemann, Martin,1975Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)seemann (author)
Chalmers tekniska högskola (creator_code:org_t)

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In:Catalysts: MDPI AG11:112073-4344

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