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대향류 석탄화력 보일러의 NOx 저감을 위한 다단 OFA 및 CH₄ lancing 성능 평가
강우석(Woosuk Kang),조현빈(Hyunbin Jo),류창국(Changkook Ryu),이종국(Jongwook Lee) 한국연소학회 2021 KOSCOSYMPOSIUM논문집 Vol.2021 No.5
This study evaluate the performance of multi-level overfire air (OFA) and CH₄ lancing on combustion and NOx reduction in an opposed wall-firing boiler. Computational fluid dynamics (CFD) incorporating advanced coal combustion models was applied to evaluate two design parameters while fixing total stoichiometric ratio (SR) at 1.15 and that for the burner zone at 0.89. First, the OFA was modified into two levels (OFA1 and OFA2) and the flow rate distribution between them was evaluated. Second, the amount of CH₄ injected at the burners was varied between 0% and 20% of thermal input partially replacing that of coal. For the reference case, the CFD results showed reasonable agreement with the design data in terms of heat distribution and NOx emission. The NOx emission was reduced by 9% when OFA2 was used alone, the peak gas temperature entering the heat exchanger zone decreased by 25 ℃. When the thermal input of CH₄ was 10%, the NOx emission was reduced by 22% and the peak gas temperature was decreased by 5 ℃. All cases showed satisfactory carbon conversion, except for the case with a thermal input of CH₄ at 20%. The results suggest that the introduction of multi-level OFA and CH₄ lancing can be effective measures for NOx reduction without deteriorating the boiler performance.
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