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백세현,Baek, Sehyun 한국전력공사 2021 KEPCO Journal on electric power and energy Vol.7 No.1
해외 발전사업의 기술 경쟁력 우위 선점을 위해서는 발전시스템에 대한 최적설계기술 및 발전소 운영 기간 중 최소 비용으로 높은 신뢰도의 설비 관리, 최적 성능 유지를 할 수 있는 O&M 관리 기술이 필요하다. 전력연구원은 해외발전사업 전주기 기술지원을 위한 연구개발을 수행하고 있다.
화력발전시스템 Heat and Mass Balance 최적설계 자동화기법
백세현,장지훈,김영주,Baek, SeHyun,Jang, jihoon,Kim, YoungJoo 한국전력공사 2019 KEPCO Journal on electric power and energy Vol.5 No.3
In this study, the Heat & Mass balance design optimization tool has developed by linking the design input/output variables with the Heat & Mass balance calculation solver and optimization algorithm and also automating the iterative calculation process. As a result of testing this optimization tool for 10 kinds of power plant, it was expected to improve the NPV and IRR compared with general design methods. 본 연구에서는 발전시스템의 설계 입출력변수들을 Heat & Mass balance 계산 solver 및 최적화 알고리즘과 연계하고 반복계산 과정을 자동화함으로써 기술 및 경제적 측면을 고려한 최적의 발전시스템 Heat & Mass balance 설계를 도출하는 최적설계 자동화 기법을 개발하였다. 그리고 이에 대한 효과를 분석하기 위하여 발전소 형식별 10종에 대하여 최적설계 기법을 적용한 결과, NPV 및 IRR에 대한 개선 효과를 기대할 수 있었다.
국내 4개 중유발전소 실증실험을 통한 발전연료 대체용 바이오중유의 연소특성 연구
백세현(Sehyun Baek),김현희(Hyunhee Kim),박호영(Hoyoung Park),김영주(Young Joo Kim),김태형(Tae Hyung Kim),고성호(Sung Ho Ko) 한국연소학회 2015 한국연소학회지 Vol.20 No.1
This paper presents the results of field demonstration for fuel switching to bio-fuel oil in 4 commercial heavy oil fired power plants. The 100% fuel switching field demonstration was successfully carried out in two tangential-firing boilers at a capacity of 75 and 100 MWe respectively without major equipment retrofit, and also 25% bio-fuel oil blending for two opposite firing boilers at a capacity of 350 and 400 MWe respectively. Despite the low density and heating value, the bio fuel was successfully replaced heavy fuel oil at the full load by only adjusting operational parameters. Incase of bio fuel oil combustion, heat absorption of radiative heat transfer section was reduced while convection section has opposite trend. In pollutants emission, a major reductionin SOx as well as 10-20% reduction in NOx were achieved by the fuels witching. On the other hand, boiler efficiency was slightly underestimated.
미분탄 화력발전소 보일러내부 국부유동 진단 및 마모예측기법 시험적용연구
백세현(Sehyun Baek),김영주(Young Joo Kim),한가람(Karam Han),박상빈(Sangbin Park),김현희(Hyunhee Kim) 한국연소학회 2018 한국연소학회지 Vol.23 No.2
Boiler tube erosion by fly ash in coal-fired power plants is the most troublesome problem, resulting in unplanned shutdowns or significant maintenance costs. In order to reduce the such erosion phenomenon, it is necessary to measure the local flow of boiler inside accurately and to relieve the high velocity at local region. In this study, the off-line cold air flow diagnostics and real-time combustion analysis methods were applied to the plant site test, in order to evaluate the local gas flow velocity quantitatively and to estimate the erosion tendency in the boiler so that derive the optimal maintenance method. As a result, the area most susceptible to wear was predicted as the economizer tube which is located near the wall of the boiler back pass and the estimated maximum erosion rate was over the 300 μm/year.
최근 3년간 수입 유연탄 분석 및 연소열성능 해석을 활용한 석탄화력 발전소 탄종 경제성 평가 연구
백세현(Sehyun Baek),박호영(Hoyoung Park),고성호(SungHo Ko) 한국연소학회 2013 한국연소학회지 Vol.18 No.3
In this study, the economic evaluation for imported coals was conducted for power plant based on thermodynamical performance analysis. The number of coal types considered was 1,755 imported by five power generation companies in Korea during the 2010-2012. The higher heating value (HHV) of the coals ranged 4,000-6,500 kcal/kg, mostly sub-bituminous. The 1D thermo-dynamical performance modeling was performed for a 500 MWe standard power plant using PROATES code. It was founded that the low rank coals had negative effects on the plant efficiency mainly due to the increased heat loss by moisture, hydrogen and flue gas. Based on the performance analysis, the economic performance of the coals was evaluated. The apparent price of low-rank coals tended to be significantly lower than design coal; for example, the unit price of coal with a HHV of 4,000 kcal/kg was 57% of the reference coal having 6,080 kcal/kg. Considering the negative effects leading to a decrease in the thermal performance, heating value compensation, and increased parasite load, the corrected unit cost for the coal with 4,000 kcal/kg was 90.7% of the reference coal. Overall, the cost saving by imported coals was not high as expected.
국내 500MW 표준석탄화력 발전소의 친환경 성능개선을 위한 리파워링 방안 연구
백세현(Sehyun Baek),장지훈(Jihoon Jang),김영주(Youngjoo Kim) 한국연소학회 2019 한국연소학회지 Vol.24 No.4
Recently, the abolition policy for coal-fired power plant has been established in KOREA, because they are regarded as the main culprits for the emission of greenhouse gases, fine dusts and nitrogen oxides. But it is expected to cause a huge loss in terms of economical and stable electric energy supply. Therefore the feasibility of the hot wind box repowering method to improve the environmentally friendly as well as high efficiency performance of the aged coal fired power plant was studied in this paper. This method combines the existing boiler with an additional gas turbine in the range of about 30 to 55% of the power output of the existing power plant, and the gas turbine exhaust gas is used as combustion air of existing boiler, and then flue gas of boiler is recovered by heating the feed water. The effect of applying this method is expected to be approximately 7%p increase in electric efficiency, 35% increase in power output, 50% reduction in coal use, 30% reduction in CO₂, and 41% reduction in dust and sulfur dioxide emission.