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500 MWe급 접선 연소 보일러 해석시 난류 혼합 속도 및 석탄 연소 모델의 영향 평가
양주향(Joo-Hyang Yang),강기섭(Kie-Seop Kang),류창국(Changkook Ryu) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12
Computational fluid dynamics (CFD) modeling of large-scale coal-fired boilers requires a complicated set of flow, heat transfer and combustion process models based on different degrees of simplification. This study investigates the influence of coal devolatilization, char conversion and turbulent gas reaction models in CFD for a tangential-firing boiler at 500MWe capacity. Devolatilization model is found out not significant on the overall results, when the kinetic rates and the composition of volatiles were varied. In contrast, the turbulence mixing rate influenced significantly on the gas reaction rates, temperature, and heat transfer rate on the wall. The influence of char conversion by the unreacted core shrinking model (UCSM) and the 1st-order global rate model was not significant, but the unburned carbon concentration was predicted in details by the UCSM. Overall, the effects of the selected models were found similar with previous study for a wall-firing boiler.
나익환(Ik Hwan Na),이재욱(Jae Wook Lee),강기섭(Kie Seop Kang),양원(Won Yang) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
This article presents experimental result of syngas reburning in alab-scale furnace with a gas burner. Syngas was used as reburn fuel that is targeted gas through gasification or pyrolysis of low-rank coal. Heating value of this syngas is about 890㎉/N㎥. local temperature data in furnace were obtained to check the temperature distribution in reburn zone. And flue-gas composition such as O₂, CO, NOx were obtained to investigate the reduction of characteristics of NOx. Temperature distribution of furnace was not varied significantly for various stioichiometric ratios in the reburning zone, but NOx reduction was observed for higher stiochiometric ratio in the reburning zone as highly reburning rate.