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Extension and evaluation of a macroscopic model for syngas-fueled chemical looping combustion

AuthorsMei, Daofeng; Abad Secades, Alberto ; Zhao, Haibo; Yan, Shuiping; Wang, Baowen; Yuan, Qiaoxia
KeywordsCO2 capture
Chemical Looping Combustion
Macroscopic fluidized bed model
Cu-based oxygen carrier
Shrinking core model
Issue Date6-Oct-2018
CitationChemical Engineering and Processing 133: 106-116 (2018)
AbstractSyngas-fueled Chemical Looping Combustion (syngas-CLC) which can be integrated with ex-situ gasification of coal has advantages over the direct use of coal in CLC: (i) no requirement of carbon stripper, (ii) no interaction of oxygen carrier with coal ash, (iii) no loss of oxygen carrier with the draining stream of ash. Few works on simulation of syngas-CLC were performed, although experimental investigations were extensively carried out. In this work, a macroscopic fuel reactor model is extended to a lab-scale 500 Wth reactor. The model based on fluid dynamics, mass balance and reduction kinetics is solved with MATLAB® codes and validated against experiments. Influences of various operation parameters are evaluated to study the flexibility of this model. It is shown that the model can give satisfactory predictions for fuel reactor of a syngas-CLC system, independent on the operation conditions. Variations of syngas composition, temperature, solids circulation and oxygen carrier inventory show different effects on flue gas composition and combustion efficiency. After thorough simulation, a region for a combustion efficiency of ηC = 99.9% is proposed, with which the optimized conditions for the 500 Wth reactor are established. An oxygen carrier inventory as low as 50 kg/MWth can assure the complete syngas combustion.
A macroscopic model was extended to the simulation of the bubbling fluidized fuel reactor of a 500 Wth continuous syngas-CLC facility. Behaviors of emulsion phase, bubble phase and freeboard were focused for the formulation of the reactor model. Good agreements of experiments and modeling results were achieved. After thorough simulation under various operation conditions, the macroscopic model exhibits satisfactory flexibility to different reaction environments. Based on the modeling, optimized operation regions for almost full syngas combustion with the lowest oxygen carrier inventory was developed.
Description12 Figures, 4 Tables.-- © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher version (URL)http://dx.doi.org/10.1016/j.cep.2018.10.003
Appears in Collections:(ICB) Artículos
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