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NH3-induced removal of NOx from a flue gas stream by silent discharge ozone generation in a double reactor system

  • Environmental Engineering
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Abstract

NOx, a generic term for the nitrogen oxides generated from combustion in the presence of nitrogen, is a serious threat to human health. This study examined the removal of NOx using ammonia (NH3) and ozone produced using a silent discharge method. The effects of temperature and residence time on NOx removal with NH3 injection in a double reactor system were investigated. An increase in temperature resulted in higher levels of O3 decomposition, whereas the maximum particle formation in the form of ammonium nitrate (NH4NO3) was achieved when both reactors were kept at 180 oC. NH3 and O3 injection in large quantities and NO in smaller amounts with a residence time of 10.2 s resulted in the maximum particulate formation. In contrast, when an excess of NH3 was supplied, it resulted in N2O formation due to the formation of NH2 radicals generated from a reaction of NO2 with NH3. In addition, 100% NO removal was achieved regardless of the residence time. Kinetic simulations indicated the possibility of moisture being the limiting reactant.

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Acknowledgements

This research was supported by the National Strategic Project-Fine particle of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (MSIT), the Ministry of Environment (ME), and the Ministry of Health and Welfare (MOHW) (2017M3D8A1092029).

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  1. Co-first authors

Authors and Affiliations

  1. School of Environmental Engineering, University of Seoul, Seoul, 02504, Korea

    Yujin Hwang, Abid Farooq, Ki Hoon Kim & Young-Kwon Park

  2. Department of Environmental Engineering, Sunchon National University, Suncheon, 57922, Korea

    Sung Hoon Park & Min Young Kim

  3. Department of Environmental Engineering, Kangwon National University, Chuncheon, 24341, Korea

    Myong-Hwa Lee

  4. Thermochemical Energy System R&D Group, Korea Institute of Industrial Technology, Cheonan, 31056, Korea

    Seuk Cheun Choi

  5. Department of Bioenvironmental & Chemical Engineering, Chosun College of Science & Technology, Gwangju, 501-744, Korea

    Rae-su Park

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  1. Yujin Hwang
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  2. Abid Farooq
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  3. Sung Hoon Park
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  7. Min Young Kim
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  8. Rae-su Park
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  9. Young-Kwon Park
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Correspondence to Young-Kwon Park.

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Hwang, Y., Farooq, A., Park, S.H. et al. NH3-induced removal of NOx from a flue gas stream by silent discharge ozone generation in a double reactor system. Korean J. Chem. Eng. 36, 1291–1297 (2019). https://doi.org/10.1007/s11814-019-0325-8

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  • DOI: https://doi.org/10.1007/s11814-019-0325-8

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