Chemical Looping Gasification of Wood Waste Using NiO-Modified Hematite as an Oxygen Carrier

Jinlong Xie, Kang Zhu, Zhen Zhang, Xinfei Chen, Yan Lin, Jianjun Hu, Ya Xiong, Yongqi Zhang, Zhen Huang () and Hongyu Huang
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Jinlong Xie: School of Mechanical and Electrical Engineering, Guangzhou University, No. 230 Waihuan Xi Road, Guangzhou 510006, China
Kang Zhu: School of Mechanical and Electrical Engineering, Guangzhou University, No. 230 Waihuan Xi Road, Guangzhou 510006, China
Zhen Zhang: School of Mechanical and Electrical Engineering, Guangzhou University, No. 230 Waihuan Xi Road, Guangzhou 510006, China
Xinfei Chen: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), No. 2 Nengyuan Road, Wushan, Tianhe District, Guangzhou 510640, China
Yan Lin: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), No. 2 Nengyuan Road, Wushan, Tianhe District, Guangzhou 510640, China
Jianjun Hu: Key Laboratory of New Materials and Facilities for Rural Renewable Energy Ministry of Agriculture and Rural Affairs, College of Mechanical & Electrical Engineering, Henan Agricultural University, No. 63 Agricultural Road, Zhengzhou 450002, China
Ya Xiong: School of Environmental Science and Engineering, Sun Yat-sen University, No. 135 Xingang Xi Road, Guangzhou 510275, China
Yongqi Zhang: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry Chinese Academy of Sciences, Taiyuan 030001, China
Zhen Huang: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), No. 2 Nengyuan Road, Wushan, Tianhe District, Guangzhou 510640, China
Hongyu Huang: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), No. 2 Nengyuan Road, Wushan, Tianhe District, Guangzhou 510640, China

Energies, 2023, vol. 16, issue 4, 1-16

Abstract: Chemical looping gasification (CLG) technology is an effective approach to converting wood waste into high-quality syngas. In the present work, the reactivity of natural hematite is enhanced by doping with nickel oxide (NiO), and the effects of various operating parameters upon the CLG of wood waste are investigated using the NiO-modified hematite as an oxygen carrier. The NiO-modified hematite gives a significantly increased carbon conversion of 79.74%, and a valid gas yield of 0.69 m 3 /kg, compared to 68.13% and 0.59 m 3 /kg, respectively, for the pristine (natural) hematite, and 54.62% and 0.55 m 3 /kg, respectively, for the Al 2 O 3 , thereby indicating that the modification with NiO improves reactivity of natural hematite towards the CLG of wood waste. In addition, a suitable mass ratio of oxygen carrier to wood waste (O/W) is shown to be beneficial for the production of high-quality syngas, with a maximum valid gas yield of 0.69 m 3 /kg at an O/W ratio of 1. Further, an increase in reaction temperature is shown to promote the conversion of wood waste, giving a maximum conversion of 86.14% at reaction temperature of 900 °C. In addition, the introduction of an appropriate amount of steam improves both the conversion of wood waste and the quality of the syngas, although excessive steam leads to decreases in the reaction temperature and gas residence time. Therefore, the optimum S/B (mass ratio of steam to biomass) is determined to be 0.4, giving a carbon conversion and valid gas yield of 86.63% and 0.94 m 3 /kg, respectively. Moreover, the reactivity of the NiO-modified hematite is well-maintained during 20 cycles, with a carbon conversion and valid gas yield of around 79% and 0.69 m 3 /kg, respectively. Additionally, the XRD and SEM-EDS analyses indicate no measurable change in the crystal phase of the re-oxidized oxygen carrier.

Keywords: chemical looping gasification (CLG); oxygen carrier; wood waste; NiO modification; hematite (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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