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상용 미분탄 보일러 연소해석에서 석탄 탈휘발 모델 및 난류반응속도의 영향 평가
양주향(JooHyang Yang),김정은(Jung-en A. Kim),류창국(Changkook Ryu) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
Predicting coal combustion by computational fluid dynamics (CFD) requires a combination of complicated flow and reaction models for turbulence, radiation, particle flows, heterogeneous combustion, and gaseous reactions. There are various levels of models available for each of the phenomena, but the use of advanced models are significantly restricted in a large-scale boiler due to the computational costs and the balance of accuracy between adopted models. In this study, the influence of coal devolatilization model and turbulent mixing rate was assessed in CFD for a commercial boiler at 500 MWe capacity. For coal devolatilization, two models were compared: i) a simple model assuming single volatile compound based on proximate analysis and ii) advanced model of FLASHCHAIN with multiple volatile species. It was found out that the influence of the model was observed near the flames but the overall gas temperature and heat transfer rate to the boiler were very similar. The devolatilization rate was found not significant since the difference in near-flame temperature became noticeable when it was multiplied by 10 or 0.1. In contrast, the influence of turbulent mixing rate (constant A in the Magnussen model) was found very large. Considering the heat transfer rate and flame temperature, a value of 1.0 was recommended for the rate constant.
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미분탄 바이오매스 혼소 시 연료 단계 연소를 통한 NOx 저감 특성 연구
강기섭(Kieseop Kang),오준호(Junho Oh),양주향(Joohyang Yang),양원(Won Yang),류창국(Changkook Ryu) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.5
This study investigates the co-combustion characteristics of biomass in a coal fired tangential firing boiler in a 560 MWe capacity power plant. The detailed flow, heat and reaction characteristics for different cofiring methods were evaluated using computational fluid dynamics adopting sub-models for combustion of solid fuels. The cofiring of biomass having a lower calorific value led to overall decrease in the gas temperatures of the burner zone and corresponding decrease in NOx emission. The use of dedicated burners for biomass had different temperature and NOx concentrations, compared to the cases for direct cofiring of coal/biomass blends. The results suggest that biomass cofiring method can be optimized for reduced NOx emission.
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