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500MWe 접선연소식 석탄 보일러의 NOx 저감을 위한 SOFA 최적화 연구
조현빈(Hyunbin Jo),강기섭(Kiseop Kang),박종근(JongKuen Park),류창국(Changkook Ryu),안현수(Hyunsoo Ahn),고영건(Younggun Go) 한국연소학회 2019 KOSCOSYMPOSIUM논문집 Vol.2019 No.5
This study investigated the optimization of separated overfire air (SOFA) on combustion and NOx emission in a retrofitted tangential-firing boiler at a 500 MWe capacity. Computational fluid dynamic (CFD) simulations incorporating advanced coal combustion models were performed for two operating parameters of the boiler. First, the flow rate of SOFA was varied between 15% and 35% of the total air while the flow rate of CCOFA (Close-coupled overfire air) was fixed at 5%. Second, the proportion of SOFA was varied from 0% to 25% while holding the flow rate of total OFA was fixed at 25%. When compared with the operation data, the CFD results showed reasonable agreement in terms of the heat distribution of the boiler and NOx emission for the reference case. The NOx emission at the furnace exit was reduced by up to 33% but unburned carbon in fly ash was increased by 3 times when the flow rate of SOFA increased to 35%. When the total OFA was fixed at 25%, increasing the SOFA reduced both the NOx emission and unburned carbon up to a ceratin proportion, and then increased them. This suggests that the combustion air distribution can be optimized between SOFA and CCOFA for reduction of both NOx and unburned carbon.
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