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Online Measurements of Alkali and Heavy Tar Components in Biomass Gasification
University of Gothenburg, Sweden.
RISE - Research Institutes of Sweden, Safety and Transport, Safety.
RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
University of Gothenburg, Sweden.
2017 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 31, no 8, p. 8152-8161Article in journal (Refereed) Published
Abstract [en]

Tar and alkali metal compounds are released during biomass gasification and have a major impact on the operation and performance of gasification processes. Herein we describe a novel method for characterization of alkali and heavy tar compounds in the hot product gas formed during gasification. Gas is continuously extracted, cooled and diluted, which results in condensation of tar and alkali into aerosol particles. The thermal stability of these particles is subsequently evaluated using a volatility tandem differential mobility analyzer (VTDMA) method. The technique is adopted from aerosol science where it is frequently used to characterize the thermal properties of aerosol particles. Laboratory studies show that pure and mixed alkali salts and organic compounds evaporate in well-defined temperature ranges, which can be used to determine the chemical composition of particles. The performance of the VTDMA is demonstrated at a 4 MWth dual fluidized bed gasifier using two different types of online sampling systems. Alkali metal compounds and a wide distribution of heavy tar components with boiling points above 400°C are observed in the product gas. Implications and potential further improvements of the technique are discussed.

Place, publisher, year, edition, pages
2017. Vol. 31, no 8, p. 8152-8161
Keywords [en]
Aerosols, Alkali metals, Chemical compounds, Fluidized beds, Gasification, Heavy metal compounds, Online systems, Tar, Thermodynamic stability, Aerosol particles, Biomass Gasification, Chemical compositions, Dual fluidized beds, Gasification process, Laboratory studies, On-line measurement, Tandem differential mobility analyzers, Alkali metal compounds
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33152DOI: 10.1021/acs.energyfuels.7b00474Scopus ID: 2-s2.0-85027834530OAI: oai:DiVA.org:ri-33152DiVA, id: diva2:1178923
Available from: 2018-01-31 Created: 2018-01-31 Last updated: 2018-01-31Bibliographically approved

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CiteExportLink to record
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  • apa
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