Study of defluidization of iron- and manganese-based oxygen carriers under highly reducing conditions in a lab-scale fluidized-bed batch reactor
Journal article, 2021

Oxygen carriers play an important role in chemical looping processes to transport oxygen for fuel conversion. In this study, the defluidization phenomena of oxygen carriers were examined under highly reducing conditions in a fluidized-bed batch reactor. This is highly relevant to chemical-looping gasification, where oxygen carriers could be reduced to a significant extent compared to that in chemical-looping combustion. Only a few studies have reported the physical phenomena in a fluidized bed system under highly reducing conditions. Three iron- and two manganese-based oxygen carriers were investigated at 900 ◦C at several degrees of reduction in this study. Some oxygen carriers that have been exposed to several hours of operation in a 300 W chemical-looping reactor unit were also included in this study to provide a comparison to the fresh-calcined materials. Defluidization of particle beds occurred with the iron-based oxygen carriers, except for LD slag, which has a low content of iron. The defluidization was caused by the formation of elemental iron on the oxygen carriers' surface at high degree of reduction. All defluidizations occurred at a mass-based conversion (Δω) between 3.2–5.0%. The manganese based materials were found to be less prone to defluidization.

Defluidization

Oxygen carrier

Chemical looping

Highly reducing environment

Author

Victor Purnomo

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry 2

Chalmers, Space, Earth and Environment, Energy Technology, Energy Technology 2

Duygu Yilmaz

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry 2

Henrik Leion

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry 2

Tobias Mattisson

Chalmers, Space, Earth and Environment, Energy Technology

Fuel Processing Technology

0378-3820 (ISSN)

Vol. 219 106874

Chemical Looping gAsification foR sustainAble production of biofuels (CLARA))

European Commission (EC) (817841CLARA), 2018-11-01 -- 2022-10-31.

Driving Forces

Sustainable development

Subject Categories

Energy Engineering

Chemical Process Engineering

Environmental Sciences

Areas of Advance

Energy

Materials Science

Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1016/j.fuproc.2021.106874

More information

Latest update

6/1/2021 1