Low-cost catalysts for in-situ improvement of producer gas quality during direct gasification of biomass
authors Pio, DT; Tarelho, LAC; Pinto, RG; Matos, MAA; Frade, JR; Yaremchenko, A; Mishra, GS; Pinto, PCR
nationality International
journal ENERGY
author keywords Biomass; Bubbling fluidized bed; Gasification; Catalyst
keywords BUBBLING FLUIDIZED-BED; MISCANTHUS X GIGANTEUS; TAR ELIMINATION; ENERGY; AIR; TECHNOLOGY; GENERATION; REDUCTION; PYROLYSIS; HYDROGEN
abstract In this work, the concept of biomass direct (air) gasification was demonstrated in a pilot-scale bubbling fluidized bed and the influence of in-situ application of low-cost catalytic materials on the produced gas characteristics and gasifier performance was analyzed. Three different low-cost catalysts were tested: bottom bed ashes resulting from combustion of residual forest biomass derived from eucalyptus, char particles resulting from wood pellets direct (air) gasification, and synthetic fayalite (Fe2SiO4). Without using catalysts, the produced gas composition was 7.7-16.9%v CO, 3.2-8.3%v H-2, 0.5-3.4%v CH4 and 9.5 -14.6%v CO2, with 2.4-4.3 MJ/Nm(3) lower heating value, specific dry gas production between 1.0 and 1.8 Nm(3) dry gas/kg biomass (dry basis), cold gas efficiency between 13.7 and 30.5% and carbon conversion efficiency between 30.7 and 50.9%. With the use of catalysts, the produced gas composition was 14.2 -37.6%v CO, 9.5-14.7%v H-2, 2.6-3.5%v CH4 and 3.6-14.8%v CO2, with 3.9-6.3 MJ/Nm(3) lower heating value, specific dry gas production between 1.4 and 2.0 Nm3 dry gas/kg biomass (dry basis), cold gas efficiency between 38.1 and 66.3% and carbon conversion efficiency between 56.8 and 86.6%. The highest increase in H-2 concentration (352% increase) was observed on experiments using wood pellets char as catalyst while the highest increase in CO (305% increase), lower heating value (123% increase), specific dry gas production (62% increase), cold gas efficiency (262% increase) and carbon conversion efficiency (174% increase), was observed on experiments using synthetic Fe2SiO4 as catalyst. (C) 2018 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-5442
year published 2018
volume 165
beginning page 442
ending page 454
digital object identifier (doi) 10.1016/j.energy.2018.09.119
web of science category Thermodynamics; Energy & Fuels
subject category Thermodynamics; Energy & Fuels
unique article identifier WOS:000455171600037
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journal analysis (jcr 2017):
journal impact factor 4.968
5 year journal impact factor 5.582
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