Study of defluidization of iron- and manganese-based oxygen carriers under highly reducing conditions in a lab-scale fluidized-bed batch reactor
| Autor: | Duygu Vefikuluçay Yilmaz, Henrik Leion, Tobias Mattisson, Victor Purnomo |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
Materials science
020209 energy General Chemical Engineering Batch reactor Lab scale Energy Engineering and Power Technology chemistry.chemical_element Slag 02 engineering and technology Manganese Combustion Oxygen Fuel Technology 020401 chemical engineering chemistry Chemical engineering Fluidized bed visual_art 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium 0204 chemical engineering Chemical looping combustion |
| Zdroj: | Fuel Processing Technology. 219:106874 |
| ISSN: | 0378-3820 |
| DOI: | 10.1016/j.fuproc.2021.106874 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|