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Online Measurements of Alkali Metals during Start-up and Operation of an Industrial-Scale Biomass Gasification Plant
University of Gothenburg, Sweden.
RISE - Research Institutes of Sweden, Safety and Transport, Safety.
Göteborg Energi AB, Sweden.
RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
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2018 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 32, no 1, p. 532-541Article in journal (Refereed) Published
Abstract [en]

Alkali metal compounds may have positive influences on biomass gasification by affecting char reactivity and tar reforming but may also disturb the process by formation of deposits and agglomerates. We herein present results from online measurements of alkali compounds and particle concentrations in a dual fluidized bed gasifier with an input of 32 MWth. A surface ionization detector was used to measure alkali concentrations in the product gas, and aerosol particle measurement techniques were employed to study concentrations and properties of condensable components in the gas. Measurements were performed during start-up and steady-state operation of the gasifier. The alkali concentration increased to approximately 200 mg m-3 when fuel was fed to the gasifier and continued to rise during activation of the olivine bed by addition of potassium carbonate, while the alkali concentration was in the range from 20 to 60 mg m-3 during steady-state operation. Addition of fresh bed material and recirculated ash had noticeable effects on the observed alkali concentrations, and K2CO3 additions to improve tar chemistry resulted in increased levels of alkali in the product gas. Addition of elemental sulfur led to reduced concentrations of CH4 and heavy tars, while no clear influence on the alkali concentration was observed. The study shows that alkali concentrations are high in the product gas, which has implications for the fluidized bed process, tar chemistry, and operation of downstream components including coolers, filters, and catalytically active materials used for product gas reforming.

Place, publisher, year, edition, pages
2018. Vol. 32, no 1, p. 532-541
Keyword [en]
Alkali metal compounds, Fluidized bed process, Fluidized beds, Gases, Ionization of gases, Potash, Silicate minerals, Tar, Aerosol particle measurement, Alkali concentrations, Biomass Gasification, Biomass gasification plant, Condensable components, Downstream components, Particle concentrations, Steady-state operation, Gasification
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33248DOI: 10.1021/acs.energyfuels.7b03135Scopus ID: 2-s2.0-85040766200OAI: oai:DiVA.org:ri-33248DiVA: diva2:1182220
Available from: 2018-02-12 Created: 2018-02-12 Last updated: 2018-02-12Bibliographically approved

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