지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 서정세
- 발행연도
- 2016
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이 논문의 연구 히스토리 (4)
2016
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Hydrogen energy is energy that has both high efficiency and cleanness as clean energy, and is resources that can solve environmental problems as well as energy resources exhaustion. The problem of current reformers is that most of their machines operating at a high temperature lack durability due to fatigue failure caused by the temperature, which shortens their life. It is said that operation at a high temperature results in additional energy loss. It is deemed that research on the low-temperature state under 230℃ in operating temperature is needed in order to increase the durability of reformers.
To solve the above problem, a reformer was designed so that it may be easily applied to proton exchange membrane fuel cells (PEMFC), and its numerical analysis was carried out. And flow characteristics in the above reformer and the mass transfer characteristics of a steam-methanol mixture were investigated, and analysis was carried out to improve the methanol conversion efficiency. As a result, it was found that the methanol conversion efficiency is influenced by the residence time of a methanol mixture, and also by channel length and the diameter of the reformer; and thus the suitable length and diameter of the reformer were found out. It was found that the lower the porosity of a reformer was, the abruptly higher, the pressure became, while the methanol conversion efficiency increased slightly; and that reaction appeared in the steam-methanol reformer only when the temperature of the reformer''s outer walls was above 180℃.
To solve the above problem, a reformer was designed so that it may be easily applied to proton exchange membrane fuel cells (PEMFC), and its numerical analysis was carried out. And flow characteristics in the above reformer and the mass transfer characteristics of a steam-methanol mixture were investigated, and analysis was carried out to improve the methanol conversion efficiency. As a result, it was found that the methanol conversion efficiency is influenced by the residence time of a methanol mixture, and also by channel length and the diameter of the reformer; and thus the suitable length and diameter of the reformer were found out. It was found that the lower the porosity of a reformer was, the abruptly higher, the pressure became, while the methanol conversion efficiency increased slightly; and that reaction appeared in the steam-methanol reformer only when the temperature of the reformer''s outer walls was above 180℃.
목차
Ⅰ. 서론 11.1 연구 배경 및 목적 11.2 연료전지(Fuel cell)의 개요 및 특징 61.3 국내외 연구동향 91.4 연구 방법 및 범위 12Ⅱ. 이론적 배경 142.1 수증기-메탄올 개질 142.2 유동장 지배방정식 162.3 화학반응률(Chemical reaction rate) 172.4 분자확산(Molecular diffusivity) : 분자운동이론 182.5 열전도(Thermal conductivity) 202.6 촉매반응기 압력강하(Pressure drop) 21Ⅲ. 곡유로 채널형 개질기 수치해석 223.1 곡유로 채널형 개질기 길이 변화에 대한 수치해석 모델 223.2 곡유로 채널형 개질기 길이 변화에 대한 수치해석 253.3 곡유로 채널형 개질기 길이 변화에 대한 수치해석 결과 263.4 곡유로 채널형 개질기 다공성 변화에 대한 수치해석 결과 323.5 곡유로 채널형 개질기 온도 변화에 대한 수치해석 결과 37Ⅴ. 결론 42참고 문헌 44
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