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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.
황정선(J.S.Hwang),이병호(B.H.Lee),이상준(S.J.Lee),최경호(G.H.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
Studies were performed with two commonly used additive metals. cerium and iron. with a conventional diesel fuel in order to investigate fuel additive effects on extaust emissions and combustion characteristics. Measurements were made on a single cylinder direct injection engine and included total particulate mass. NO_x. HC and cylinder gas pressure. The cerium and iron based additive reduced the particulate emissions and hydrocarbon by 23~35% and 14%. respectively. Both additives were found tohave the least effect on cylinder gas pressure.<br/>
The Bio-polymer Based Shape-memorizing Multi-pixel Photonic skins for Wearable Sensor Applications
G. Choi(최건준),S.-H. Lee(이상현),M. Seong(성민호),I. Hwang(황인솔),K. Sun(선가현),M. Kang(강민수),H. Jang(장혜진),J. Kim(김재일),S. J. Park(박성진),C. Park(박채빈),S. Kim(김소미),D. H. Lee(이동혁),H. E. Jeong(정훈의) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.5월