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석탄화력 배연탈황설비 가스재열기용 열소자 성능 전산 평가
황현성(H.S. Hwang),강율호(Y.H. Kang),박원규(W.G. Park) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.2
Gas Gas Heater (GGH) is a facility that cools the hot gas generated after combustion to the temperature appropriate to react in the absorption tower and improves the corrosion and ventilation of the duct through heat exchange of the low-temperature gas discharged again through the desulfurization process with the hot gas. The hot-temperature gas passing through the GGH causes scale build-up, such as scattered gypsum inside the thermal element, including various air pollutants, which increases the differential pressure, causing losses of fan load and power plant shutdown. Computational fluid dynamics (CFD) was used to analyze how much the MU_Profile was developed to effectively reduce the differential pressure compared to the LS_Profile currently installed in the power plant. An optimized k-e model was found by performing comparative verification with actual power plant operation data, and this model was applied to MU_Profile for analysis. In addition, as the unit was expanded, the analysis grid and analysis time were reduced by using the porous medium method. As a result, MU_Profile decreased by -28.49% (based on Sector Unit 100% NR) in the differential pressure portion than LS_Profile. In the heat exchange performance, it was confirmed that MU_Profile was -15.61% (based on Sector Unit 100% NR) than LS_Profile. In terms of heat exchange LS is better, but heat exchange in GGH is performed to eliminate the white smoke effect of the gas escaping to the stack, and it was confirmed that there was no white smoke effect in both the LS_Profile and MU_Prfile. Therefore, the newly developed MU_Profile improves GGH performance than LS_Profile.
대형 풍력발전기 부품의 극한 환경 시험을 위한 극저온 챔버의 열유동 해석에 대한 연구
김민규(M.K. Kim),강율호(Y.H. Kang),박원규(W.G. Park) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.3
More and more, spaces are decreasing which satisfy multiple requirements for wind power plants. However, areas which have excellent wind resources and are free to civil complaints occupy a large space, although they are exposed to the cryogenic environment. This study conducted a thermal-fluid analysis of a cryogenic chamber for testing large wind turbine parts exposed to the cryogenic environment. The position of supply air is placed to the upper area to compare each cooling performance for each location of various outlets in mixing ventilated conditions. The study carried out CFD analysis for the chamber both with and without a test object. For the cases without the test object, the air temperature of the upper supply and down extract type chamber was cooled faster by 5-100% than the others. However, for the cases with the test object, the object temperature of upper supply and center extract on the opposite side type chamber was cooled faster by 33-132% than the others. The cooling performance by the air inside the chamber and the test object did not show the same pattern, which implicates the need to consider the cooling performance by not only the air but also the test object in the large cryogenic chamber design for testing large parts.
가스터빈 압축기용 허니컴 래버린스 실의 실제 운전조건에 따른 누설량 특성 분석
임샛별(S.B. Lim),김민규(M.K. Kim),강율호(Y.H. Kang),박원규(W.G. Park) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.4
Recently, There are many studies in progress in order to improve the efficiency of the gas turbine. Leakage in losses of the gas turbine account for the largest proportion. Seal is a sealing device to reduce the flow from leaking by the pressure difference inside the turbine. Compressor has another value according to the shape and pressure conditions in each stage. Thus, it is necessary to seal design for boundary conditions in order to minimize leakage. At the actual operating conditions of the compressor, numerical analysis of honeycomb labyrinth seal was performed in accordance with pressure, temperature, rotor speed for CFD. As a result, when the temperature increases, the leakage is decreased. Also, when the pressure increases linearly with increased leakage, and there was no effect of the rotation speed.