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Investigation on water vapor effect on direct sulfation during wet-recycle oxy-coal combustion

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  • Duan, Lunbo
  • Jiang, Zhongxiao
  • Chen, Xiaoping
  • Zhao, Changsui

Abstract

During oxy-coal combustion process, limestone desulfurization may change from indirect into direct sulfation due to the high partial pressure of CO2. When the wet flue gas is recycled, the water vapor will also be enriched in the furnace and affect the desulfurization reactions. In the paper, two limestone sorbents were used to study the effect of water vapor on direct sulfation. Parameters including water vapor concentration, temperature and SO2 concentration were analyzed. Results show that the presence of water vapor has a negligible effect on the direct sulfation during the kinetically-controlled regime, while enhances the calcium conversion during the diffusion-controlled stage. The presence of water vapor promotes the solid-state diffusion of the sulfated product, and sintering of the product layer is intensified. The vacancies in the particles migrate along crystal grain boundaries and through the crystal lattice, resulting in a reverse flow of mass into the pores. The pore structure character of the products sulfated in the presence of water vapor is improved.

Suggested Citation

  • Duan, Lunbo & Jiang, Zhongxiao & Chen, Xiaoping & Zhao, Changsui, 2013. "Investigation on water vapor effect on direct sulfation during wet-recycle oxy-coal combustion," Applied Energy, Elsevier, vol. 108(C), pages 121-127.
    • Handle: RePEc:eee:appene:v:108:y:2013:i:c:p:121-127
    DOI: 10.1016/j.apenergy.2013.03.022
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    Cited by:

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    5. Li, Shiyuan & Li, Haoyu & Li, Wei & Xu, Mingxin & Eddings, Eric G. & Ren, Qiangqiang & Lu, Qinggang, 2017. "Coal combustion emission and ash formation characteristics at high oxygen concentration in a 1MWth pilot-scale oxy-fuel circulating fluidized bed," Applied Energy, Elsevier, vol. 197(C), pages 203-211.
    6. Huang, Xiaohong & Hu, Fan & Liu, Xuhui & Liu, Zhaohui, 2022. "Structure and reactivity of chars prepared from low-volatile coal under O2/N2 and O2/CO2 conditions in a flat-flame assisted entrained flow reactor," Energy, Elsevier, vol. 261(PB).
    7. Ma, Xiaotong & Li, Yingjie & Shi, Lei & He, Zirui & Wang, Zeyan, 2016. "Fabrication and CO2 capture performance of magnesia-stabilized carbide slag by by-product of biodiesel during calcium looping process," Applied Energy, Elsevier, vol. 168(C), pages 85-95.
    8. 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.

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