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혼탄연소가 보일러 및 보일러 후단 열교환기 성능에 미치는 영향에 관한 수치해석적 연구
정광국(Kwangkook Jeong),이신구(Shinku Lee),이응철(Eungchul Lee),서형석(Hyungsuk Seo) 한국연소학회 2019 KOSCOSYMPOSIUM논문집 Vol.2019 No.5
A numerical modeling has been developed to predict the fly ash deposition rates in full-scale post-boiler heat exchangers by using the finite differential method. The equipment at upstream that has major effects on the flue gas and fly ash flowing into the heat exchangers at downstream were modeled by using the mass and energy balance method. The objective of this paper is to delineate the impact of blended coal combustion on the performance of boiler and post-boiler heat exchangers for supercritical pulverized coal-fired power plant applications. The boiler model considered the nonlinear effect of blended coal combustion, and the deposition model predicted the transient performance in the post-boiler heat exchangers in conjunction with the fuel quality. The modeling results were compared with the transient measurement and design data provided from the baseline power plant in terms of temperature profiles and efficiencies in the equipment. As the results of the modeling, the normalized boiler efficiencies of the practical blending cases were underperformed within 5% compared to the performance coal. The transient case studies on the GGC with variations of coal blending showed that the calculated fouling factors due to the fly ash deposition onto the tube walls were reached to the saturated values within 33 months, at which the correlations with the coal rank were nonlinear.