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Effect of CaO on NO x Reduction by Selective Non-Catalytic Reduction under Variable Gas Compositions in a Simulated Cement Precalciner Atmosphere

Author

Listed:
  • Ye Sun

    (School of Space and Environment, Beihang University, Beijing 100191, China)

  • Weiyi Fan

    (School of Space and Environment, Beihang University, Beijing 100191, China)

  • Tianle Zhu

    (School of Space and Environment, Beihang University, Beijing 100191, China)

  • Xiaowei Hong

    (School of Space and Environment, Beihang University, Beijing 100191, China)

Abstract

High-concentration CaO particles and gas compositions have a significant influence on NO x reduction by selective non-catalytic reduction (SNCR) in cement precalciners. The effect of gas composition on NO x reduction by SNCR with NH 3 was studied in a cement precalciner atmosphere with and without CaO at 700–1100 °C. It was found that CaO significantly lowers NO x reduction efficiency between 750 °C and 1000 °C, which is attributed to the catalytic oxidation of NH 3 to NO. Although increasing NH 3 concentration was advantageous to NO x reduction, the existence of CaO led to the opposite result at 750–900 °C. Adding H 2 O can suppress the negative effect of CaO on NO x reduction. Decreasing O 2 content from 10% to 1% shifts the temperature range in which CaO has a significant effect from 750–1000 °C to 800–1050 °C. CO has a variety of influences on the CaO effect under different experimental conditions. The influences of NH 3 , H 2 O, O 2 , and CO on the effect of CaO can be attributed to the impacts of the gas compositions on gas-phase NH 3 conversion, gas-solid catalytic NH 3 oxidation, or both processes. A proposed pathway for the effect of gas compositions on NO x reduction in CaO-containing SNCR process was developed that well predicted the CaO-containing SNCR process.

Suggested Citation

  • Ye Sun & Weiyi Fan & Tianle Zhu & Xiaowei Hong, 2017. "Effect of CaO on NO x Reduction by Selective Non-Catalytic Reduction under Variable Gas Compositions in a Simulated Cement Precalciner Atmosphere," IJERPH, MDPI, vol. 14(12), pages 1-12, November.
    • Handle: RePEc:gam:jijerp:v:14:y:2017:i:12:p:1474-:d:120798
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    References listed on IDEAS

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    1. Bo Li & Jinyang Zhao & Junfu Lu, 2015. "Numerical Study of the Simultaneous Oxidation of NO and SO 2 by Ozone," IJERPH, MDPI, vol. 12(2), pages 1-17, January.
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    Cited by:

    1. Jia, Meng-Chuan & Su, Sheng & He, Li-Mo & Chen, Yi-Feng & Xu, Kai & Jiang, Long & Xu, Jun & Wang, Yi & Hu, Song & Xiang, Jun, 2023. "Experimental and density functional theory study on role of calcium in NO reduction by NH3 on char surface during ammonia co-firing with pulverized coal," Energy, Elsevier, vol. 285(C).

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