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Nitric Oxide Emission Reduction in Reheating Furnaces through Burner and Furnace Air-Staged Combustions

Author

Listed:
  • Yonmo Sung

    (Department of Energy and Mechanical Engineering, Gyeongsang National University, Tongyeonghaean-ro 2, Tongyeong-si 53064, Korea)

  • Seungtae Kim

    (Environment and Energy Engineering Team, Hyundai Steel Company, Dangjin-si 31719, Korea)

  • Byunghwa Jang

    (Environment and Energy Engineering Team, Hyundai Steel Company, Dangjin-si 31719, Korea)

  • Changyong Oh

    (Environment and Energy Planning Team, Hyundai Steel Company, Dangjin-si 31719, Korea)

  • Taeyun Jee

    (Large Section Mill Department, Hyundai Steel Company, Incheon 22525, Korea)

  • Soonil Park

    (Large Section Mill Department, Hyundai Steel Company, Incheon 22525, Korea)

  • Kwansic Park

    (Environment Management Team, Hyundai Steel Company, Incheon 22525, Korea)

  • Siyoul Chang

    (Environment Management Team, Hyundai Steel Company, Incheon 22525, Korea)

Abstract

In this study, a series of experiments were conducted on a testing facility and a real-scale furnace, for analyzing the nitric oxide (NO) emission reduction. The effects of the temperature, oxygen concentration, and amount of secondary combustion air were investigated in a single-burner combustion system. Additionally, the NO-reduction rate before and after combustion modifications in both the burner and furnace air-staged combustion were evaluated for a real-scale reheating furnace. The air-to-fuel equivalence ratio (λ) of individual combustion zones for the furnace was optimized for NO reduction without any incomplete combustion. The results indicated that the NO emission for controlling the λ of a single-zone decreased linearly with a decrease in the λ values in the individual firing tests (top-heat, bottom-heat, and bottom-soak zones). Moreover, the multi-zone control of the λ values for individual combustion zones was optimized at 1.13 (top-preheat), 1.0 (bottom-preheat), 1.0 (top-heat), 0.97 (bottom-heat), 1.0 (top-soak), and 0.97 (bottom-soak). In this firing condition, the modifications reduced the NO emissions by approximately 23%, as indicated by a comparison of the data obtained before and after the modifications. Thus, the combined application of burner and furnace air-staged combustions facilitated NO-emission reduction.

Suggested Citation

  • Yonmo Sung & Seungtae Kim & Byunghwa Jang & Changyong Oh & Taeyun Jee & Soonil Park & Kwansic Park & Siyoul Chang, 2021. "Nitric Oxide Emission Reduction in Reheating Furnaces through Burner and Furnace Air-Staged Combustions," Energies, MDPI, vol. 14(6), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:6:p:1599-:d:516395
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    References listed on IDEAS

    as
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    Cited by:

    1. Yonmo Sung, 2023. "Advances in Reduction Technologies of Gas Emissions (CO 2 , NO x , and SO 2 ) in Combustion-Related Applications," Energies, MDPI, vol. 16(8), pages 1-4, April.
    2. Silvia Maria Zanoli & Crescenzo Pepe & Lorenzo Orlietti, 2023. "Synergic Combination of Hardware and Software Innovations for Energy Efficiency and Process Control Improvement: A Steel Industry Application," Energies, MDPI, vol. 16(10), pages 1-20, May.

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