Investigations on the Effect of Pre-Treatment of Wheat Straw on Ash-Related Issues in Chemical Looping Gasification (CLG) in Comparison with Woody Biomass

Florian Lebendig, Ibai Funcia, Rául Pérez-Vega and Michael Müller
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Florian Lebendig: Forschungszentrum Jülich GmbH, Institute for Energy and Climate Research (IEK-2), Wilhelm-Johnen-Straße, 52428 Julich, Germany
Ibai Funcia: National Renewable Energy Centre, Av. Ciudad de la Innovación 7, 31621 Sarriguren, Spain
Rául Pérez-Vega: National Renewable Energy Centre, Av. Ciudad de la Innovación 7, 31621 Sarriguren, Spain
Michael Müller: Forschungszentrum Jülich GmbH, Institute for Energy and Climate Research (IEK-2), Wilhelm-Johnen-Straße, 52428 Julich, Germany

Energies, 2022, vol. 15, issue 9, 1-25

Abstract: Biomass chemical looping gasification (BCLG) is a promising autothermic route for producing sustainable, N 2 -free, and carbon neutral syngas for producing liquid biofuels or high value hydrocarbons. However, different ash-related issues, such as high-temperature corrosion, fouling and slagging, bed agglomeration, or poisoning of the oxygen carrier might cause significant ecologic and economic challenges for reliable implementation of BCLG. In this work, lab-scale investigations under gasification-like conditions at 950 °C and thermodynamic modelling were combined for assessing the influence of composition, pre-treatment methods, such as torrefaction and water-leaching, and Ca-based additives on the release and fate of volatile inorganics, as well as on ash melting behavior. A deep characterization of both (non-)condensable gas species and ash composition behavior, joint with thermodynamic modelling has shown that different pre-treatment methods and/or Ca-additives can significantly counteract the above-mentioned problems. It can be concluded that torrefaction alone is not suitable to obtain the desired effects in terms of ash melting behavior or release of problematic volatile species. However, very promising results were achieved when torrefied or water-leached wheat straw was blended with 2 wt% CaCO 3 , since ash melting behavior was improved up to a similar level than woody biomass. Generally, both torrefaction and water-leaching reduced the amount of chlorine significantly.

Keywords: biomass; chemical looping gasification; pre-treatment; release and fate of inorganic species; agglomeration; fouling and slagging; high temperature corrosion; poisoning of oxygen carrier (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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