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Effect of the Mixing Structure Parameters of a Self-reflux Burner on Combustion Characteristics and NOx Emission

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Abstract

To solve the problem of low efficiency of NOx emission reduction in self-reflux burners, this study is based on the concept of coordinated control of self-reflux burner structural and thermal parameters. After completing the structural design and optimization of thermal parameters, we continue to adjust the two key structural parameters: the nozzle axis distance and the length of the cylindrical section, to minimize NOx emissions. These are the two parameters that chiefly affect the mixing of flue gas and fuel gas. The results show that increasing nozzle axis distance can delay the mixing of gas and air and create a more uniform oxygen concentration field for the combustion process. The maximum combustion temperature is reduced from 1973.65 K to 1935.88 K and the volume fraction of NOx in the flue gas is reduced from 188.08×10−6 to 143.47×10−6. However, compared with the nozzle axis distance, the length of the cylindrical section of the burner has little effect on the mixing of the flow field. Under different cylindrical section lengths, the maximum combustion temperature does not change more than 3 K, and the volume fraction of NOx in the flue gas changes within 5×10−6.

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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 National Natural Science Foundation of China (No. 52006008, 62033014), Guangdong Basic and Applied Basic Research Foundation (2019A1515110743), Scientific and Technological Innovation Foundation of Shunde Graduate School of USTB (BK20BE010), Guangdong University Research Findings Commercialization Center (2020JNHB06), and the Central Universities of China (FRF-TP-18-074A1, FRF-BD-20-09A).

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Authors and Affiliations

  1. School of energy and environmental engineering, Shunde Graduate School, University of Science and Technology Beijing, Beijing, 100083, China

    Qian Xu, Meng Shen, Zhihui Liu & Junxiao Feng

  2. Beijing Key Laboratory of 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. Key Laboratory of HVAC, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China

    Yaxuan Xiong

  5. School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, China

    Lin Liu

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

    Jiulong Wang

Authors
  1. Qian Xu
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  2. Meng Shen
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  3. Kejian Shi
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  4. Zhihui Liu
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  5. Nevzat Akkurt
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  6. Yaxuan Xiong
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  7. Lin Liu
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  8. Junxiao Feng
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  9. Jiulong Wang
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Corresponding authors

Correspondence to Junxiao Feng or Jiulong Wang.

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Xu, Q., Shen, M., Shi, K. et al. Effect of the Mixing Structure Parameters of a Self-reflux Burner on Combustion Characteristics and NOx Emission. J. Therm. Sci. 30, 1224–1236 (2021). https://doi.org/10.1007/s11630-021-1414-7

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  • DOI: https://doi.org/10.1007/s11630-021-1414-7

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