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Effects of Optimized Operating Parameters on Combustion Characteristics and NOx Emissions of a Burner based on Orthogonal Analysis

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Abstract

To optimize the structure of the burner, improve the combustion performance, and reduce the emission of NOx, a self-circulating low NOx combustion technology was used to design a new type of flue gas self-circulating low NOx burner. Based on previous research on the numerical model of combustion and the composition of mixed gas on combustion and NOx emissions, the effect of various factors on the ejection coefficient of the flue gas self-circulating structure was analyzed using the orthogonal test method, and the burner operating parameters, such as preheating temperature and excess air coefficient, were deeply studied through the three-dimensional finite element numerical model in this paper. The results show that the diameter ratio of the nozzle and the length of the cylindrical section of the flue gas self-circulating structure have great influence on its ejection and mixing ability. The optimal ejection coefficient was 0.4829. Overall, the amount of NOx emissions greatly increased from 6.23×10−6 (volume fraction) at the preheating temperature 973 K to 3.5×10−3 at preheating temperature 1573 K. When the excess air coefficient decreased from 1.2 to 1, the maximum combustion temperature decreased from 2036.3 K to 1954.22 K, and the NOx emissions decreased from 352.29×10−6 to 159.73×10−6.

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Acknowledgments

The authors gratefully acknowledge the National Environmental and Energy Base for International Science & Technology Cooperation. And this work is supported by the Fundamental Research Funds for the Central Universities of China (FRF-TP-18-074A1, FRF-BD-20-09A), the China Postdoctoral Science Foundation (No. 2019M650491), and the National Natural Science Foundation of China (No. 11801029).

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Authors and Affiliations

  1. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Qian Xu, Gang Yang, Lidong Zhu, Kejian Shi, Kang Wang, Zhenwei Zou & Zhihui Liu

  2. Beijing Key Laboratory for Energy Conservation and Emission Reduction for Metallurgical Industry, Beijing, 100083, China

    Qian Xu

  3. Department of Mechanical Engineering, Munzur University, Tunceli, 62000, Turkey

    Nevzat Akkurt

  4. Department of Big Data Technology and Application Development, Computer Network Information Center, Chinese Academy of Sciences, Beijing, 100190, China

    Jiulong Wang

  5. AVIC Xinxiang Aviation Industry (group) CO., LTD, Henan, 453002, China

    Zhiwei Du

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  1. Qian Xu
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Correspondence to Zhihui Liu or Zhiwei Du.

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Xu, Q., Akkurt, N., Yang, G. et al. Effects of Optimized Operating Parameters on Combustion Characteristics and NOx Emissions of a Burner based on Orthogonal Analysis. J. Therm. Sci. 30, 1212–1223 (2021). https://doi.org/10.1007/s11630-020-1347-6

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  • DOI: https://doi.org/10.1007/s11630-020-1347-6

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