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Online Measurements of Alkali and Heavy Tar Components in Biomass Gasification

Journal article
Authors Dan Gall
M. Pushp
K. O. Davidsson
Jan B. C. Pettersson
Published in Energy & Fuels
Volume 31
Issue 8
Pages 8152-8161
ISSN 0887-0624
Publication year 2017
Published at Department of Chemistry and Molecular Biology
Pages 8152-8161
Language English U kh , 1979 , journal of the electrochemical society , v126 , p490
Links doi.org/10.1021/acs.energyfuels.7b0...
Keywords differential mobility analyzer, fluidized-bed gasification, product gas, volatility, particles, evaporation, potassium, gasifier, aerosols, reactor, Energy & Fuels, Engineering
Subject categories Chemical Sciences

Abstract

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 degrees C are observed in the product gas. Implications and potential further improvements of the technique are discussed.

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