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Effect of metallurgical dust on NO emissions during coal combustion process

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Abstract

NO emissions from coal combustion are receiving significant attention in recent years. As a solid waste generated from metallurgical industry, metallurgical dust (MD) contains a large amount of metal oxides, such as Fe2O3, CaO, SiO2 and Al2O3, as well as other rare metal oxides. The influence of MD on the NO emissions and the mechanism of the coal combustion systems were analyzed. The results show that the peak values of NO emission decrease with the increase in MD mass percent, and the curve of NO emission can be divided into two stages including rapid generation (400−600 °C) and slow release (800−900 °C). The reduction of NO is significantly affected by temperature, volatile components, O2 and CO. CO has a significant catalytic action which can deoxidize NO to N2. The results obtained by X-ray diffraction and scanning electron microscopy indicate that multiple components in MD, such as Fe9TiO15, Fe2O3 and TiO2, can react with NO to produce TiN. Besides, the alkali metals in MD, such as Na, K and Ca, may catalyze NO precursor to inhibit NO emission. These results indicate that MD is cheap and highly efficient in controlling NO emissions during coal combustion processes.

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Acknowledgements

This work was financially supported by the Joint Fund of the National Natural Science Foundation of China and the Baosteel Group Corporation (No. U1660106).

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Authors and Affiliations

  1. School of Metallurgy Engineering, Anhui University of Technology, Ma’anshan, 243002, Anhui, China

    Zhi-fang Gao, Hong-ming Long, Tie-jun Chun & Zheng-wei Yu

  2. Key Laboratory of Metallurgical Emission Reduction and Resources Recycling, Ministry of Education, Anhui University of Technology, Ma’anshan, 243002, Anhui, China

    Zhi-fang Gao, Hong-ming Long & Zhao-jin Wu

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  1. Zhi-fang Gao
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  2. Hong-ming Long
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  3. Tie-jun Chun
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  5. Zheng-wei Yu
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Correspondence to Hong-ming Long.

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Gao, Zf., Long, Hm., Chun, Tj. et al. Effect of metallurgical dust on NO emissions during coal combustion process. J. Iron Steel Res. Int. 25, 19–27 (2018). https://doi.org/10.1007/s42243-017-0007-x

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  • DOI: https://doi.org/10.1007/s42243-017-0007-x

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