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

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

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

Maric, Jelena, 1983 (author): Chalmers tekniska högskola,Chalmers University of Technology

Thunman, Henrik, 1970 (author): Chalmers tekniska högskola,Chalmers University of Technology

Seemann, Martin, 1975 (author): Chalmers tekniska högskola,Chalmers University of Technology

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2021-11-16
2021
English.
In: Catalysts. - : MDPI AG. - 2073-4344. ; 11:11

Related links:: https://research.cha... (primary) (free); show more...; https://www.mdpi.com...; https://doi.org/10.3...; https://research.cha...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

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

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)

Keyword

Catalyst
Olivine
Tar
Combustion emissions
Dual fluidized bed
Combustor
Sulfur
Potassium
Gasifier

Publication and Content Type

art (subject category)
ref (subject category)

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Chemical Enginee ...; and Chemical Process ...

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