Tar formation during eucalyptus gasification in a bubbling fluidized bed reactor: Effect of feedstock and reactor bed composition
authors Pio, DT; Ruivo, LCM; Tarelho, LAC; Frade, JR; Kantarelis, E; Engvall, K
nationality International
journal ENERGY CONVERSION AND MANAGEMENT
author keywords Gasification; Biomass; Tars; Ash; Bubbling fluidized bed; Eucalyptus
keywords TEMPERATURE STEAM GASIFICATION; BIOMASS GASIFICATION; OPERATING-CONDITIONS; GAS-PRODUCTION; PRODUCER GAS; PYROLYSIS; LIGNIN; SWITCHGRASS; EVOLUTION; CATALYSTS
abstract Tar compounds are inevitably present in the raw producer gas from biomass gasification and currently represent the main barrier for the commercial breakthrough of gasification technologies. In the present work, tar concentration in the producer gas from direct gasification of distinct types of residual forest biomass from eucalyptus in a 5 kWth bubbling fluidized bed reactor was investigated. The influence of the feedstock chemical composition and gasifier operation time was evaluated. Average tar concentration values in the raw producer gas were between 1.5 and 13.3 g/Nm(3), representing a tar production between 8.4 and 67.0 g tar/kg biomass db, which surpasses suggested tar concentration limits for various potential applications for the producer gas. Major average tar compounds present in the tar sampled from the raw producer gas were benzene (47.1 %wt), toluene (21.6 %wt), naphthalene (10 %wt) and indene (6.4 %wt). A significant decay of the tar concentration in the producer gas was observed with increasing gasifier operation time, namely up to 50% within 45 min of operation, indicating its dependency on inorganics (e.g., CaCO3, KCl, maximum 5.5 %wt) and solid carbon (maximum 22.7 %wt) accumulation in the reactor bed.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0196-8904
isbn 1879-2227
year published 2021
volume 229
digital object identifier (doi) 10.1016/j.enconman.2020.113749
web of science category 19
subject category Thermodynamics; Energy & Fuels; Mechanics
unique article identifier WOS:000614046800002
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