Analysis of a two-stage fuel reactor system for the chemical-looping combustion of lignite and bituminous coal

Publikationstyp
Journal Article
Date Issued
2016-10-01
Sprache
English
Author(s)
Haus, Johannes  
Lyu, Kai  
Hartge, Ernst-Ulrich  
Heinrich, Stefan  
Werther, Joachim 
Institut
Feststoffverfahrenstechnik und Partikeltechnologie V-3  
TORE-URI
http://hdl.handle.net/11420/5560
Journal
Energy technology  
Volume
4
Issue
10
Start Page
1263
End Page
1273
Citation
Energy Technology 10 (4): 1263-1273 (2016-10-01)
Publisher DOI
10.1002/ente.201600102
Scopus ID
2-s2.0-84991329825
Publisher
Wiley-VCH
To 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.
Subjects
chemical looping
coal
copper oxide
solid fuel
two-stage reactor
DDC Class
600: Technik
More Funding Information
Financial support by the German Research Foundation (DFG) within the framework of the priority program SPP 1679 “Dynamic simulation of interconnected solids processes DYNSIM‐FP” is gratefully acknowledged; grant number HA 6935/2‐1.