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Oxy-fuel co-combustion characteristics and kinetics of various ultra-low volatile coal-based solid waste blends

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Abstract

The co-firing of various ultra-low volatile coal-based solid wastes (CSWs) under oxy-fuel condition is a promising approach to elevate the energy conversion efficiency in coal chemistry industry. However, the kinetics and thermal transformation mechanisms during oxy-fuel co-combustion of various CSWs blends are still vague, which need to be further elucidated. Here, the physical–chemical features of CSWs were firstly revealed. Moreover, the oxy-fuel co-combustion characteristics and kinetics of various CSWs were investigated. The results illustrate that four chemical forms of fuel nitrogen could be obtained in pyrolyzed semi-coke (PS), while only two occurrence forms of fuel nitrogen were observed in two residual carbons, including fluidized bed gasification residual carbon (FRC) and coal-water-slurry gasification residual carbon (CRC). The reactivities of various samples could be promoted by the increasing temperature during gasification process. The combustion of volatile matter and fixed carbon could be promoted by an increase in oxygen content in oxy-fuel atmosphere. The combustion characteristic index (S) of 50% PS/50% CRC is raised by 59.3% and that of 50% PS/50% FRC is increased by only 19.0% with the oxygen concentration elevated from 30 to 40%. The effects of rising residual carbon proportion on PS/CRC blend are more obvious than those on PS/FRC blend. The additive of PS in blend could promote the combustion behaviors of residual carbon, especially on CRC. The mass loss rate of 50% PS/50% CRC blend changes significantly with the heating rate, which is greater than that of 50% PS/50% FRC blend. The average apparent activation energy (Eam) of 50% PS/50% CRC blend is lower than that of linear calculation result. The Eam of CRC could be reduced by blending PS, and the poor combustion behaviors of CRC are improved by addition of PS.

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Acknowledgements

The authors acknowledge financial support from the National Natural Science Foundation of China (No. 52176129).

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Authors and Affiliations

  1. State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China

    Chaowei Wang, Chang’an Wang, Lin Zhao, Maoyun Luo, Qinqin Feng, Qisen Mao, Jinping Zhang & Defu Che

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  1. Chaowei Wang
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  2. Chang’an Wang
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  3. Lin Zhao
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  8. Defu Che
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Correspondence to Chang’an Wang.

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Wang, C., Wang, C., Zhao, L. et al. Oxy-fuel co-combustion characteristics and kinetics of various ultra-low volatile coal-based solid waste blends. J Therm Anal Calorim 147, 15017–15032 (2022). https://doi.org/10.1007/s10973-022-11692-y

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