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

Yonmo Sung, Seungtae Kim, Byunghwa Jang, Changyong Oh, Taeyun Jee, Soonil Park, Kwansic Park and Siyoul Chang
Additional contact information
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

Energies, 2021, vol. 14, issue 6, 1-15

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.

Keywords: reheating furnace; low-NO x burner; combustion modification; staged combustion; coke oven gas; NO x emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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