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Thermodynamic Analysis of Biomass Char Chemical Looping Combustion with NiFe2O4 as Oxygen Carrier
Received date: 2016-02-24
Revised date: 2016-05-06
Online published: 2016-06-27
A model of biomass char chemical looping combustion was built using NiFe2O4 as oxygen carrier. Thermodynamic analysis and process simulation of the combustion were performed with software of HSC Chemistry 5.0 based on Gibbs free energy minimization principle. The simulation result for the reduction stage showed that the system performed best with the molar ratio of oxygen carrier to biomass char (O/BC) being 1.5 at the reactor temperature of 800°C. The thermodynamic analysis showed that the oxygen carrier was gradually reduced as a sequence of NiFe2O4→Ni-Fe2O3→ Ni-Fe3O4→Ni-FeO→Ni-Fe. The simulation result for the oxidation stage demonstrated that the lattice oxygen could recover to the original degree thermodynamically, while the XRD pattern of the oxidized NiFe2O4 particles confirmed that the reduced oxygen carrier could be re-oxidized to form NiFe2O4 spinel under the atmosphere of air from an experimental point of view.
LIU Shuai , HUANG Zhen , HE Fang , ZHENG An-qing , SHEN Yang , LI Hai-bin . Thermodynamic Analysis of Biomass Char Chemical Looping Combustion with NiFe2O4 as Oxygen Carrier[J]. Advances in New and Renewable Energy, 2016 , 4(3) : 172 -178 . DOI: 10.3969/j.issn.2095-560X.2016.03.002
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