Study on performance of $n-C_4H_10-driven$ solid oxide fuel cell = 부탄 가스 기반 고체산화물 연료전지의 성능 향상에 관한 연구

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The solid oxide fuel cell (SOFC), a type of high-temperature fuel cells, is an attractive energy conversion device due to its high electric efficiency and low pollution. A major advantage of SOFCs is their fuel flexibility, which comes from their high operating temperature. For the SOFC system, it is possible to design a compact reformer without a carbon monoxide removal process or internal reformation of various types of hydrocarbon fuels with steam on the anode. The operation type depends on the system size and the kind of fuel as well as on design of SOFC. Common problem for internal and external reforming is carbon deposition on anode. In this thesis, the practical problems in an SOFC coupled with an external reformer or fueled by internal reforming of $n-C_4H_10$ were individually analyzed by long-term operation of SOFC single cell and additional experiments, and then a newly designed SOFC single cell was developed as breakthrough for SOFC using $C_4$ level hydrocarbons for operation at maximum efficiency and carbon-free zone. First, as experiment for ER type SOFC, the performance deterioration of solid oxide fuel cells (SOFCs, Nickel-Yttria stabilized zirconia (Ni-YSZ) / YSZ / lanthanum doped strontium manganite-YSZ (LSM-YSZ)) coupled with $n-C_4H_10$ steam reformers (SR), autothermal reformers (ATR), or catalytic partial oxidation reformers (CPOX) was examined using an integrated system of a micro-reactor reformer and SOFC unit. When oxygen to carbon ratio of CPOX reformer was set to 0.5, the terminal voltage rapidly degraded in CPOX-driven SOFC. In contrast, it was fairly stable for SR-driven SOFC over 250h when steam to carbon ratio (SCR) was set to 2. For ATR-driven SOFC at near the thermoneutral point (OCR = 0.5 and SCR = 1.3), significant deterioration of the terminal voltage was observed in 100 h of operation. The main precursors of carbon deposition on the SOFC were identified by reformate gas analysis during the tests. In this part, it was identi...
Advisors
Bae, Joong-Myeonresearcher배중면researcher
Description
한국과학기술원 : 기계공학전공,
Publisher
한국과학기술원
Issue Date
2011
Identifier
466319/325007  / 020075082
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 기계공학전공, 2011.2, [ xi, 137 p. ]

Keywords

Solid oxide fuel cell; Steam to specific carbon ratio; Internal reforming; External reforming; Metal-foam supported SOFC; 금속폼지지체 SOFC; 탄소침적; SSCR; 내부개질; 외부개질

URI
http://hdl.handle.net/10203/42620
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=466319&flag=dissertation
Appears in Collection
ME-Theses_Ph.D.(박사논문)
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