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Performance of a Cu–Fe‐based oxygen carrier combined with a Ni‐based oxygen carrier in a chemical‐looping combustion process based on fixed‐bed reactors
Author(s) -
Tian Qiang,
Che Lixin,
Ding Bin,
Wang Qianwei,
Su Qingquan
Publication year - 2018
Publication title -
greenhouse gases: science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 32
ISSN - 2152-3878
DOI - 10.1002/ghg.1763
Subject(s) - chemical looping combustion , oxygen , combustion , carbon fibers , chemical engineering , mixing (physics) , materials science , chemistry , analytical chemistry (journal) , composite number , chromatography , organic chemistry , composite material , engineering , physics , quantum mechanics
The application of chemical‐looping combustion (CLC) based on fixed‐bed reactors for distributed medium‐ and small‐scale hot‐water and steam gas‐fuelled boilers is promising due to its low NO x emission, high energy efficiency and nearly zero energy consumption in carbon capture. For fixed‐bed reactors, a wide operating temperature window ( T w ) for the oxygen carrier (OC) is crucial to ensure the performance and cycle life of the OC. The performance of Cu30–Fe50/Al20‐M combined with different Ni‐based OCs was investigated to extend the T w ( L ) of 600°C for Cu30–Fe50/Al20‐M to a lower temperature, which was developed previously. The different Ni‐based OCs would work as CH 4 steam reforming catalysts if their required reduction temperatures were significantly lower than the T w ( L ) of Cu30–Fe50/Al20‐M. Results showed that a Ni‐based OC of Ni60/Al40‐M could be reduced with CH 4 /H 2 O with an S/C of 1.0 at a temperature of 450°C. The combination of Cu30–Fe50/Al20 and Ni25/Al75‐I, which was packed in the bed by a mixing method, exhibited a low‐temperature reactivity and T w ( L ) was lowered from 600°C to 490°C. Moreover, carbon deposition and an intermediate compound, NiFe 2 O 4 , which was found in a composite OC of Ni–Cu–Fe–/Al, were not detected during the reduction step. Based on the results, a new CLC process, which was characterised by an integrated methane steam reforming in the reduction step, was proposed. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.