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산소극 가습도 변화에 따른 고분자 전해질 연료전지의 성능변화에 대한 3차원 수치해석적 연구
이필형(Pilhyong Lee),한상석(Sangseok Han),이재영(Jaeyoung Lee),박창수(Changsoo Park),황상순(Sangsoon Hwang) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Flow configuration and operating condition such as cell temperature, humidity at each cell, stoichiometric number is very crucial for improving its performance. Too many flow channels could enhance the performance resulting in high parasite loss. Therefore trade off between pressure drop and efficiency of fuel cell should be considered for optimum design. This work focus on numerical simulation the effects of operating condition, especially cathode humidity, with simple parallel now channel. It is known that humidity at cathode becomes very important for predicting performance of fuel cell because fully humidified condition was normally set at anode. Results show the maximum power density can be obtained under 20~30% humidified condition at cathode where oxygen concentration is moderate high maintaining high thermal conductivity at a membrane.
Baffle Plate 변화에 따른 다공 원통형 버너의 평면 예혼합 화염특성
이필형(PilHyong Lee),한상석(SangSeok Han),이재영(JaeYoung Lee),박창수(ChangSoo Park),황상순(SangSoon Hwang),이돈형(DonHyung Lee),허정선(JeongSeon Heo) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
다공철판을 활용한 다공 원통형 버너는 금속재질의 Baffle Plate와 화염 염공을 활용하여 원통형버너를 구성하기 때문에 높은 내구성, 강한 취성을 가지고 있어 많은 연구의 대상이 되고 있다. 봉 논문애서는 청동소결 Baffle Plate와 화염지지대를 적용하여 새로운 개념의 원통형버너를 개발하였다. 개발된 다공 원통형 버너의 실험을 통하여 청동소결 Baffle Plate가 연소화염의 안정성에 미치는 영향을 분석하였으며 화염지지대의 설치가 염공의 입구부분과 끝단부분에 발생하는 화염날림 현상에 미치는 영향을 분석하였다. 개발된 다공 원통형 버너의 배기가스 특성을 분석하였으며 분석결과 당량비(Ф)가 0.706-0.775부분에서 7ppm이하의 'Ox배출특성과 57ppm(O' 0% Base)이하의 'O배출특성을 확인하였다.
고분자 전해질 연료전지(PEMFC)에서 부하변화율과 당량비가 과도응답특성에 미치는 영향
한상석(Sangseok Han),이필형(Pilhyong Lee),이재영(Jaeyoung Lee),박창수(Changsoo Park),황상순(Sangsoon Hwang) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Fully three dimensional transient simulation was performed numerically in order to analyze the dynamic response of 20㎠ proton exchange fuel cell with triple serpenrtine. The effects of stoichiometric number and rate of change the load on the overshoot behavior by the variable voltage change from 0.7V to 0.5V. The overshoot in current is generally observed when voltage is suddenly changed. And the peak of overshoot in current is increased when the stoichiometric number at cathode channel is increased with a fixed anode stoichiometic number. This seems to be associated with the fact that oxygen concentration in cathode makes dominant effect on reducing the cathode overpotential.
Development of Combustion System for Solid Oxide Fuel Cell System
조순혜(Jo, Soonhye),이필형(Lee, Pilhyong),차천륜(Cha, Chunloon),홍성원(Hong, Seongweon),황상순(Hwang, Sangsoon) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Solid oxide fuel cells(SOFCs) can convert the chemical energy of fuel into electricity directly. With the rising fuel prices and stricter emission requirement, SOFCs have been widely recognized as a promising technology in the near future. In this study, lean premixed flame using the orifice swirl burner was analyzed numerically and experimentally. We used the program CHEMKIN and the GRI 3.0 chemical reaction mechanism for the calculation of burning velocity and adiabatic flame temperature to investigate the effects of equivalence ratio on the adiabatic flame temperature and burning velocity respectively. Burning velocity of hydrogen was calculated by CHEMKIN simulation was 325cm/s, which was faster than that of methane having 42 cm/s at the same equivalence ratio. Also Ansys Fluent was used so as to analysis the performance with alteration of swirl structure and orifice mixer structure. This experimental study focused on stability and emission characteristics and the influence of swirl and orifice mixer in Solid Oxide Fuel Cell Systme burner. The results show that the stable blue flame with different equivalence ratio. NOx was measured below 20 ppm from equivalence ratios 0.72 to 0.84 and CO which is a very important emission index in combustor was observed below 160 ppm under the same equivalence region.