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Chemical looping combustion of solid fuels using manganese-based oxygen carriers - investigations in 10 and 100 kW pilots
| Content Provider | Semantic Scholar |
|---|---|
| Author | Schmitz, Matthias |
| Copyright Year | 2018 |
| Abstract | According to climate simulations, the predicted carbon budget to keep global warming below 1.5°C with high certainty will be used up in 2021, assuming 2017 emissions. As an emissions overshoot seems inevitable, bioenergy with carbon capture and storage (BECCS) has been proposed as a means of removing CO2 from the atmosphere in the future. This is done by utilizing biomass in combustion processes and storing the resulting CO2 in underground geological formations such as aquifers or depleted oiland gas fields, thus rendering the total net emissions of CO2 negative. While first generation CCS technologies rely on energy-intensive active gas separation, chemical looping combustion (CLC) can omit that step by utilizing solid metal oxide particles to transfer oxygen from combustion air to fuel, making CO2 capture inherent to the process and avoiding thermodynamic energy penalties. A key research issue is to find oxygen carriers which perform satisfactorily with respect to fuel conversion and lifetime. Manganese materials are promising candidates from a thermodynamic point of view, potentially cheap and environmentally benign, but have previously been challenged with lifetime issues. The aim of this work is therefore to find and test manganese-based oxygen carrier materials with good conversion properties and high durability and to identify the process parameters influencing gas conversion and particle lifetime. To do so, the performance of six different oxygen carrier materials was investigated in continuous 10 kW and 100 kW pilots using both fossil and biomass fuels. Performance – with respect to fuel conversion – of all oxygen carriers was higher than that of the state-of-the-art material, i.e. ilmenite. Manufactured materials generally performed better and had a higher lifetime than that of natural materials, an advantage which in utility scale would have to be weighed against their higher cost. The results suggest that manganese materials, both manufactured and of natural origin, can be a feasible, efficient and cost-effective alternative as oxygen carrier in chemical looping combustion. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://research.chalmers.se/publication/500252/file/500252_Fulltext.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
