Evaluation of the chemical looping gasification characteristics of kitchen waste using CuFe2O4 and NiFe2O4 as oxygen carriers

Shiwen Fang, Xiongwei Zheng, Yan Lin, Luzhou Ding, Shuchang Yan, Jun Li, Zhen Huang and Hongyu Huang

Energy, 2024, vol. 312, issue C

Abstract: Chemical looping gasification (CLG) technology is promising for renewable energy, efficiently transforming biomass into high-quality syngas with minimal tar and pollutants. In this study, we examined the CLG characteristics of soy protein (SP), a model compound present in kitchen waste (KW), using two different oxygen carriers (OCs): Cu-Fe and Ni-Fe. The study revealed that enhancing the carbon conversion ratio (ηc) could be effectively achieved by increasing the oxygen equivalent coefficient (α) and the steam content. Consequently, the optimal gasification performance was attained when the Cu-Fe and Ni-Fe OCs were operated at the α values of 0.3 and 0.4, and steam contents of 30 % and 40 %, respectively. After ten cycles of chemical looping, both OCs retained their robust oxidation activity, ensuring that the ηc remained consistent throughout the ten cycles. Under optimized experimental conditions, the CLG characteristics of KW were successfully determined. Notably, the ηc of KW was substantially enhanced, doubling in comparison to previous levels. The Cu-Fe OC emerged as a more suitable candidate for the CLG of KW due to its lower cost and non-toxic nature. This study provides important theoretical support and practical insights for the harmless treatment and resource utilization of KW.

Keywords: Chemical looping gasification; Oxygen carrier; Kitchen waste; Soy protein (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:312:y:2024:i:c:s0360544224033954

DOI: 10.1016/j.energy.2024.133617

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