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Combustion performance of nozzles with multiple gas orifices in large ladles for temperature uniformity

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Abstract

In order to improve the baking temperature uniformity of the large ladle in steelmaking plants, the flame combustion characteristics of nozzles with different inner structures were numerically simulated with the finite volume method code Fluent. The flow field and premixed combustion reaction inside and outside the nozzle with multiple gas orifices were exhibited. Meanwhile, the influences of the gas injecting angle and the number of gas orifices on temperature, velocity, and pressure fields were studied. The results show that the flame length and width at the rear of flame temperature field reach the maximum values in the nozzle with the gas injecting angle of 20° and 4 gas orifices for the control of premixed combustion inside the nozzle, which could provide better temperature uniformity in ladles. The length of the 1273 K isothermal surface is 4.89 m, and the cross-section area at 4 m away from the outlet of the nozzle is 0.13 m2. The pressure losses of different types of nozzles range from 112.2 to 169.4 Pa and decrease with the decrement in gas injecting angle and the number of gas orifices. The ladle bottom preheating temperature is increased by 320–360 K for the optimized nozzle. The inner surface temperature differences between wall and bottom of the ladle are less than 10%. There is good baking temperature uniformity after the application of optimum structurally designed nozzles.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2016YFB0601301) and National Natural Science Foundation of China (51674030, 51574032).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Fei Yuan & An-Jun Xu

  2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Fei Yuan & An-Jun Xu

  3. School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Hong-Bing Wang

  4. State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing, 100083, China

    Pei-Ling Zhou

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  1. Fei Yuan
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  2. Hong-Bing Wang
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Correspondence to Hong-Bing Wang.

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Yuan, F., Wang, HB., Zhou, PL. et al. Combustion performance of nozzles with multiple gas orifices in large ladles for temperature uniformity. J. Iron Steel Res. Int. 25, 387–397 (2018). https://doi.org/10.1007/s42243-018-0048-9

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  • DOI: https://doi.org/10.1007/s42243-018-0048-9

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