Experimental study and design of the sulfuric acid catalytic decomposer for the nuclear hydrogen production = 원자력 수소 생산을 위한 황산 촉매 분해 공정의 개발과 분석

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The Iodine-Sulfur (IS) cycle should overcome many engineering challenges to commercialize and prove its feasibilities to compete with other thermo-chemical cycles. We have to solve some critical issues such as structural material, harsh operating condition and high capital costs for its realization. In this study, the experimental studies and design of the sulfuric acid decomposition for IS cycle have been performed to develop a highly economic low pressure (HELP) IS cycle for practical applications in real process. Main research subjects are (a) design of an intermediate heat exchanging-depressurizing loop, (b) design of a catalytic SO3 decomposer using Fe2O3 catalyst, and (c) material-corrosion resistant tests for the sulfuric acid decomposer. In the first study, an intermediate heat exchanging-depressurizing loop was devised to eliminate high operating pressure in the hydrogen side as well as technical challenges due to a large pressure difference between the reactor side and the hydrogen side. Molten salts are adequate candidates as working fluids under the high-temperature condition with homogeneous phase during pressure changing process. Using molten salts, 0.38 - 0.77% of pumping work is required to change the pressure from 1bar to 7MPa when the heat consumption of the hydrogen side is 54MW from 600MWth nuclear reactor. Li2BeF2 was selected as a possible candidate based on preliminary economic and thermal hydraulic consideration In the second study, iron (III) oxide (Fe2O3) was selected for high temperature decomposition on the assumption of commercialization considering its proper kinetics, stability and price. Since the quantitative data of the selected material are rare in open sources, this study started with collecting the very basic empirical data as well as practical implications for actual design. Experimental results of stability tests with Fe2O3 powder showed that over 65% of SO3 conversion was secured during 110 hours operation. We experim...
Advisors
No, Hee-Cheonresearcher노희천
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2013
Identifier
513618/325007  / 020085244
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2013.2, [ xiii, 151 p. ]

Keywords

Hydrogen production; thermo chemical cycle; IS cycle; sulfuric acid decomposition; 수소생산; 열화학공정; IS 사이클; 황산분해; 산화철촉매; iron oxide catalyst

URI
http://hdl.handle.net/10203/182206
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=513618&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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