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Effect of H2O on the combustion characteristics of pulverized coal in O2/CO2 atmosphere

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  • Yi, Baojun
  • Zhang, Liqi
  • Huang, Fang
  • Mao, Zhihui
  • Zheng, Chuguang

Abstract

The H2O concentration in real oxy-fuel combustion atmospheres is significantly higher than that in conventional air combustion, which strongly affects the combustion characteristics of pulverized coal. This study studies the effect of H2O on pulverized coal combustion behaviour in O2/CO2 atmosphere. The ignition temperature, burnout temperature and comprehensive reactivity of three types of Chinese coal at different H2O and O2 concentrations in O2/CO2/H2O atmosphere were investigated. The effect of particle size and heating rate on the pulverized coal combustion was also studied under high-H2O-concentration oxy-fuel atmosphere. The results showed that the presence of H2O strongly affects the combustion characteristics of coal and coal char in O2/CO2 atmosphere, leading to a greater ignition delay, faster burnout and higher comprehensive reactivity. These changes are more obvious for brown coal. Under O2/CO2/H2O atmosphere, H2O can improve the diffusivity and heat capacity of the combustion atmosphere and therefore has a positive effect on pulverized coal combustion. In addition, based on a comparison of the combustion reactivity between O2/CO2 atmosphere with and without H2O, the mechanism of coal combustion reactivity in H2O-containing atmosphere is significantly related to the heating rate.

Suggested Citation

  • Yi, Baojun & Zhang, Liqi & Huang, Fang & Mao, Zhihui & Zheng, Chuguang, 2014. "Effect of H2O on the combustion characteristics of pulverized coal in O2/CO2 atmosphere," Applied Energy, Elsevier, vol. 132(C), pages 349-357.
    • Handle: RePEc:eee:appene:v:132:y:2014:i:c:p:349-357
    DOI: 10.1016/j.apenergy.2014.07.031
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    3. Mao, Zhihui & Zhang, Liqi & Zhu, Xinyang & Pan, Cong & Yi, Baojun & Zheng, Chuguang, 2016. "Modeling of an oxy-coal flame under a steam-rich atmosphere," Applied Energy, Elsevier, vol. 161(C), pages 112-123.
    4. Yin, Chungen & Yan, Jinyue, 2016. "Oxy-fuel combustion of pulverized fuels: Combustion fundamentals and modeling," Applied Energy, Elsevier, vol. 162(C), pages 742-762.
    5. Mostafa, Mohamed E. & He, Limo & Xu, Jun & Hu, Song & Wang, Yi & Su, Sheng & Hu, Xun & Elsayed, Saad A. & Xiang, Jun, 2019. "Investigating the effect of integrated CO2 and H2O on the reactivity and kinetics of biomass pellets oxy-steam combustion using new double parallel volumetric model (DVM)," Energy, Elsevier, vol. 179(C), pages 343-357.
    6. Kai Lei & Buqing Ye & Jin Cao & Rui Zhang & Dong Liu, 2017. "Combustion Characteristics of Single Particles from Bituminous Coal and Pine Sawdust in O 2 /N 2 , O 2 /CO 2 , and O 2 /H 2 O Atmospheres," Energies, MDPI, vol. 10(11), pages 1-12, October.
    7. 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.
    8. Chen, Sheng & Liu, Hao & Zheng, Chuguang, 2017. "Methane combustion in MILD oxyfuel regime: Influences of dilution atmosphere in co-flow configuration," Energy, Elsevier, vol. 121(C), pages 159-175.
    9. Abdelhafez, Ahmed & Rashwan, Sherif S. & Nemitallah, Medhat A. & Habib, Mohamed A., 2018. "Stability map and shape of premixed CH4/O2/CO2 flames in a model gas-turbine combustor," Applied Energy, Elsevier, vol. 215(C), pages 63-74.
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