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Title

Biomass chemical looping gasification for syngas production using ilmenite as oxygen carrier in a 1.5 kWth unit

AuthorsCondori, Óscar; García Labiano, Francisco ; Diego Poza, Luis F. de ; Izquierdo Pantoja, María Teresa ; Abad Secades, Alberto ; Adánez Elorza, Juan
KeywordsBiomass
Syngas
Chemical-looping gasification
Ilmenite
Tars
Issue Date17-Aug-2020
PublisherElsevier BV
CitationChemical Engineering Journal 405: 126679 (2021)
AbstractBiomass Chemical Looping Gasification, BCLG, is a promising technology that uses lattice oxygen instead of expensive gaseous oxygen for high quality syngas production without CO2 emissions. In this work, 55 h of continuous operation in a 1.5 kWth BCLG unit using ilmenite as oxygen carrier and pine wood as fuel is reported. A new method for controlling the oxygen used in the syngas production through the control of the oxygen fed into the air reactor was used by first time in BCLG with satisfactory results. This method allows analysing the isolated effect of each one of the operating conditions: gasification temperature, TFR, steam-to-biomass ratio, S/B, and oxygen-to-biomass ratio, λ. This last parameter, λ, was the main factor affecting syngas production efficiency. Considering the high unconverted hydrocarbons usually obtained, a product gas composed by 37–40 % CO2; 27–30% H2; 17–21% CO; 10–12% CH4; and 2–3% C2-C3 with a syngas yield of 0.65 Nm3/kg dry biomass could be obtained for autothermal conditions. Tar generation was in the range 1.4–3.0 g/kg dry biomass (1–2.5 g/Nm3 d.b.), being lower than that reported by other gasification technologies. Despite its high reduction state in BCLG, ilmenite exhibited a good behaviour since remained with high reactivity during operation and no agglomeration problems were produced. However, outward migration of Fe observed in ilmenite decreased lifetime by a half during CLG operation in relation to chemical looping combustion conditions.
Description15 figures, 3 tables.-- © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher version (URL)http://dx.doi.org/10.1016/j.cej.2020.126679
URIhttp://hdl.handle.net/10261/219377
DOI10.1016/j.cej.2020.126679
ISSN1385-8947
Appears in Collections:(ICB) Artículos
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