Article · High-temperature corrosion and ash · Bed materials and oxygen carriers
Thermodynamic Modeling and Experimental Investigation of the System Fe–Ti–O-K for Ilmenite Used as Fluidized Bed Oxygen Carrier
R. Faust, I. Staničić, J. Gastaldi, E. Ansari, J. Brorsson, T. Mattisson, M. Rydén, P. Knutsson
Energy & Fuels 38, 14569–14576 (2024) · 7 citations
Abstract
High Resolution Image Download MS PowerPoint Slide The capability of ilmenite for potassium uptake in a simulated oxygen carrier-aided combustion environment has been investigated. The maximum uptake of potassium and the effect of potassium inclusion on the Fe–Ti–O system was analyzed. Through laboratory experiments and thermodynamic calculations, it was found that a molar ratio of 1:1 can be formed spontaneously for both the K–Ti-system (where the formation of K 2 Ti 2 O 5 was found) and the K–Fe-system (where KFeO 2 was found). K 2 Ti 2 O 5 was identified as an unstable phase, undergoing decomposition into K 2 Ti 4 O 9 . The study demonstrates that the maximum K uptake, through forming K 2 Ti 4 O 9 and KFeO 2, reaches 25 wt %─a notably higher value than ilmenite exposed to biomass in a fluidized bed. The research concludes that the lifetime of ilmenite is therefore rather dependent on its mechanical integrity than its maximum potassium uptake.
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BibTeX
@article{faust-2024-thermodynamic-modeling-experimental,
author = {Faust, R. and Staničić, I. and Gastaldi, J. and Ansari, E. and Brorsson, J. and Mattisson, T. and Rydén, M. and Knutsson, P.},
title = {Thermodynamic Modeling and Experimental Investigation of the System Fe–Ti–O-K for Ilmenite Used as Fluidized Bed Oxygen Carrier},
journal = {Energy \& Fuels},
year = {2024},
volume = {38},
number = {15},
pages = {14569--14576},
doi = {10.1021/acs.energyfuels.4c02016}
}