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Variation of the coal chemical structure and determination of the char molecular size at the early stage of rapid pyrolysis

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  • Cui, Tongmin
  • Fan, Wenke
  • Dai, Zhenghua
  • Guo, Qinghua
  • Yu, Guangsuo
  • Wang, Fuchen

Abstract

Rapid pyrolysis (∼104K/s) experiments investigating lignite, bituminous coal and anthracite were conducted to study the effect of the thermal process on the coal structure. The interest was focused on the chemical structure variation occurring at the early stage of pyrolysis (0–500ms) and high temperature (1173–1773K), which includes the mass loss ratio, volatile content, element content and organic groups. A series of parameters was used to characterize the chemical structure, CH2/CH3 ratio, fraction of aromatic hydrogen and aromaticity (fa). The char’s molecular size was determined based on both ring condensation degree (R/C)u and equivalent diameter of the aromatic monomer (DC). This result demonstrated that these five chemical structural parameters (CSPs) increase with the pyrolysis time and temperature. The comparison of three types of coals reveals that the CSPs of lignite are lower and increase faster than those of bituminous coal and anthracite.

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  • Cui, Tongmin & Fan, Wenke & Dai, Zhenghua & Guo, Qinghua & Yu, Guangsuo & Wang, Fuchen, 2016. "Variation of the coal chemical structure and determination of the char molecular size at the early stage of rapid pyrolysis," Applied Energy, Elsevier, vol. 179(C), pages 650-659.
    • Handle: RePEc:eee:appene:v:179:y:2016:i:c:p:650-659
    DOI: 10.1016/j.apenergy.2016.06.143
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    2. Chai, Meiyun & Xie, Li & Yu, Xi & Zhang, Xingguang & Yang, Yang & Rahman, Md. Maksudur & Blanco, Paula H. & Liu, Ronghou & Bridgwater, Anthony V. & Cai, Junmeng, 2021. "Poplar wood torrefaction: Kinetics, thermochemistry and implications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 143(C).
    3. Li, Hongjun & Chang, Qinghua & Gao, Rui & Dai, Zhenghua & Chen, Xueli & Yu, Guangsuo & Wang, Fuchen, 2018. "Fractal characteristics and reactivity evolution of lignite during the upgrading process by supercritical CO2 extraction," Applied Energy, Elsevier, vol. 225(C), pages 559-569.
    4. 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.
    5. Xu, Jun & Tang, Hao & Su, Sheng & Liu, Jiawei & Xu, Kai & Qian, Kun & Wang, Yi & Zhou, Yingbiao & Hu, Song & Zhang, Anchao & Xiang, Jun, 2018. "A study of the relationships between coal structures and combustion characteristics: The insights from micro-Raman spectroscopy based on 32 kinds of Chinese coals," Applied Energy, Elsevier, vol. 212(C), pages 46-56.
    6. Wang, Chang'an & Wu, Song & Lv, Qiang & Liu, Xuan & Chen, Wufeng & Che, Defu, 2017. "Study on correlations of coal chemical properties based on database of real-time data," Applied Energy, Elsevier, vol. 204(C), pages 1115-1123.

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