Effect of oxidation degree of iron-based oxygen carriers on their mechanical strength
Journal article, 2024

Iron-based oxygen carriers are currently one of the most popular choices for chemical looping processes. In order to minimize losses of oxygen carrier materials in the system, it is important to assess attrition characteristics. Furthermore, in chemical looping gasification where the oxygen transfer capacity needs to be limited, a higher reduction degree of oxygen carriers can be expected. As different oxidation degrees lead to different phase compositions, this study aimed to investigate the correlation between mechanical strength of iron-based oxygen carriers and the phase composition, which is the result of oxidation degree change. Our findings demonstrate that how the phase composition may affect the attrition rate of oxygen carriers depends largely on the type of the material itself. In this study, the presence of Fe-Ti and Fe-Si combinations contribute to a generally stable attrition rate, while Fe-Ca system exhibits a decreasing attrition rate. Furthermore, attrition rate shows a more conclusive trend compared to crushing strength. Among the investigated materials, both ilmenite ore and iron sand showed a robust, stable mechanical stability with an attrition rate of approximately 0.5–1 wt%/h, which is on par with that of sand (0.5 wt%/h). The attrition rates of LD slag and mill scale are lower, about 1–3 wt%/h.

Crushing strength

Oxygen carrier

Mechanical strength

Oxidation degree

Attrition resistance

Chemical looping

Author

Victor Purnomo

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Robin Faust

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Lidiya Abdisa Ejjeta

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Tobias Mattisson

Chalmers, Space, Earth and Environment, Energy Technology

Henrik Leion

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Powder Technology

0032-5910 (ISSN) 1873-328X (eISSN)

Vol. 438 119598

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Driving Forces

Sustainable development

Subject Categories

Materials Engineering

Physical Sciences

Chemical Engineering

Chemical Sciences

Areas of Advance

Energy

Materials Science

Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1016/j.powtec.2024.119598

More information

Latest update

4/5/2024 8