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자료유형
학술대회자료
저자정보
정광국 (Arkansas State University) 이신구 (Doosan Fuelcell) 이응철 (Doosan Heavy Industry) 서형석 (Doosan Heavy Industry)
저널정보
한국연소학회 KOSCO SYMPOSIUM 논문집 2019년도 한국연소학회 제58회 춘계학술대회 KOSCO SYMPOSIUM 초록집
발행연도
2019.5
수록면
100 - 103 (4page)

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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.

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