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Effect of steam concentration on demineralized coal char surface behaviors and structural characteristics during the oxy-steam combustion process

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  • Wang, Zhuozhi
  • Sun, Rui
  • Zhao, Yaying
  • Li, Yupeng
  • Ren, Xiaohan

Abstract

Oxy-steam combustion, fuel combusts in O2/H2O atmosphere, is treated to be a novel and promising technology for the next generation oxy-fuel combustion. The purpose of this study is to identify the effects of steam concentration on NO emission characteristics, functional group distribution and char NO reducibility during oxy-steam combustion process. A typical bituminous coal (SH) was employed for demineralization, devolatilization, combustion in O2/H2O environment, and investigated by Temperature Programmed Desorption/Reduction (TPD/TPR) methods and Raman spectrometer. The combustion results illustrated that char N/NO conversion during the oxy-steam combustion tests initially decreased with an increasing steam concentration in low range (1.2–8.5 vol.%), while increased apparently in high steam range (8.5–20 vol.%). Decomposition of H2O molecules promoted the formation of C(O) and small aromatic rings on particle surface at the low steam range; the high concentration of steam could promote the condensation of aromatic ring structures in char, leading to significant generation of large aromatic ring structures with a lower reactivity and the reduction of surface active sites (Cf). The TPD results illustrated that the chars oxidized at moderate steam concentration (8.5 vol.%), and the chars with moderate burnout degrees (such as S3, S6 and S11) had the largest amount of C(O). Due to the decomposition of the C(O) into new Cf and massive CO molecules, a rapid acceleration of NO reduction rate occurred in the temperature range of 1000–1400 K during the TPR process of each sample obtained from identical reaction conditions. Thus, variations in char surface behavior and microstructure might be the primary reasons affecting char-N emission.

Suggested Citation

  • Wang, Zhuozhi & Sun, Rui & Zhao, Yaying & Li, Yupeng & Ren, Xiaohan, 2019. "Effect of steam concentration on demineralized coal char surface behaviors and structural characteristics during the oxy-steam combustion process," Energy, Elsevier, vol. 174(C), pages 339-349.
  • Handle: RePEc:eee:energy:v:174:y:2019:i:c:p:339-349
    DOI: 10.1016/j.energy.2019.02.187
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    References listed on IDEAS

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    1. Lucia Álvarez & Juan Riaza & Maria V. Gil & Covadonga Pevida & José J. Pis & Fernando Rubiera, 2011. "NO emissions in oxy‐coal combustion with the addition of steam in an entrained flow reactor," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 1(2), pages 180-190, June.
    2. Xu, Jun & Su, Sheng & Sun, Zhijun & Qing, Mengxia & Xiong, Zhe & Wang, Yi & Jiang, Long & Hu, Song & Xiang, Jun, 2016. "Effects of steam and CO2 on the characteristics of chars during devolatilization in oxy-steam combustion process," Applied Energy, Elsevier, vol. 182(C), pages 20-28.
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    Cited by:

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    2. Zhang, Wenda & Sun, Shaozeng & Zhao, Yijun & Zhao, Zujie & Wang, Pengxiang & Feng, Dongdong & Li, Pengfei, 2020. "Effects of total pressure and CO2 partial pressure on the physicochemical properties and reactivity of pressurized coal char produced at rapid heating rate," Energy, Elsevier, vol. 208(C).
    3. Xu, Jun & Liu, Jiawei & Ling, Peng & Zhang, Xin & Xu, Kai & He, Limo & Wang, Yi & Su, Sheng & Hu, Song & Xiang, Jun, 2020. "Raman spectroscopy of biochar from the pyrolysis of three typical Chinese biomasses: A novel method for rapidly evaluating the biochar property," Energy, Elsevier, vol. 202(C).
    4. Deng, Lihua & Zhang, Wenda & Sun, Shaozeng & Bai, Chenxi & Zhao, Yijun & Feng, Dongdong & Zhang, Linyao & Wu, Jiangquan, 2022. "Effect of pressure on the structure and reactivity of demineralized coal during O2/H2O thermal conversion process," Energy, Elsevier, vol. 244(PA).
    5. Zhu, Wenkun & Li, Xiaohui & Sun, Rui & Yan, Yonghong & Liu, Jing & Wang, Zhuozhi & Yu, Xing, 2023. "Microstructural evolution of coal to char after pyrolysis using laser-induced breakdown spectroscopy and Raman spectroscopy," Energy, Elsevier, vol. 267(C).

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