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석탄 보일러 전산유동해석 시 유동 및 반응모델의 영향에 대한 비교 연구
김정은(Jungeun A. Kim),홍재현(Jaehyeon Hong),박상현(Sanghyun Park),류창국(Changkook Ryu) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
Prediction of coal combustion in a commercial boiler by computational fluid dynamics (CFD) requires a combination of complicated flow and reaction models for turbulence, radiation, discrete particle flows, devolatilization and heterogeneous char reactions, and gaseous reactions. There are various levels of models available for each of these phenomena, but the use of advanced models are significantly restricted due to the computational costs and the balance of the accuracy between different models. The validation of the results is also very difficult because of the limitations in measured data. This study investigated the effects of adopting different models for key phenomena of coal combustion in a 500㎿e opposed firing boiler. The results were assessed by comparison with gas temperature measurement. The appropriate flow or reaction models were recommended on the viewpoint of the practicality of comparative simulations for operating conditions.
전산유동해석을 이용한 500㎿e급 대향류 석탄 보일러의 운전특성 분석
홍재현(Jaehyeon Hong),김정은(Jungeun A. Kim),류창국(Changkook Ryu),김영주(Yeongju Kim) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
This study investigates the different combustion and flow characteristics between two 500㎿e opposed-fired coal boilers by numerical simulation. To accurately address the operating conditions of the two boilers, the simulations were carried out in three consecutive stages of windboxes, swirl burners and the furnaces. The settings for control dampers inside windboxes and guidevane angles of swirl burners gave significantly influenced the flow rate distribution and swirl strength of combustion air. The results successfully identified the different behavior of gas temperatures observed during actual operations of the two boilers. Details of internal circulation zones of flames, particle to wall impingement and wall heat flux were acquired, which can be used to adjust the operational parameters.