Haus, JohannesJohannesHausLyu, KaiKaiLyuHartge, Ernst-UlrichErnst-UlrichHartgeHeinrich, StefanStefanHeinrichWerther, JoachimJoachimWerther2020-03-312020-03-312016-10-01Energy Technology 10 (4): 1263-1273 (2016-10-01)http://hdl.handle.net/11420/5560To investigate the influence of the fuel characteristics on the conversion behavior in a chemical-looping combustion facility, lignite coal dust (d90,3=233 μm) and two fractions of bituminous coal with different particle sizes (fine fraction d90,3=163 μm, coarse fraction d50,3=707 μm) were used as solid fuel. To improve the conversion performance, a pilot plant with a rated power of 25 kW was constructed with a two-stage fuel reactor. The influence of the fuel composition, particle size, and the presence/absence of elemental oxygen on the conversion in the fuel reactor are presented. The used oxygen carrier was produced by the impregnation of γ-alumina oxide with copper oxide, which is able to release gaseous oxygen, but loses this ability because of deactivation. The lignite dust shows a very good conversion performance and carbon capture efficiencies over 95 % as well as oxygen demands below 2 %. Both bituminous coal fractions have a good performance with regard to fuel conversion and oxygen demand but they suffer from a high carbon slip. Hence the carbon capture efficiency is around 60 % for the fine fraction and 40 % for the coarse one. The performance improvement as a result of the second stage was investigated separately, and we proved that it enhances the overall conversion. In addition, the oxygen carrier generated a favorable reaction environment by releasing elemental oxygen in the second stage of the fuel reactor.en2194-429620161012631273Wiley-VCHchemical loopingcoalcopper oxidesolid fueltwo-stage reactorTechnikJournal Article10.1002/ente.201600102Other