Study on liquid organic hydrogen carrier for hydrogen energy storage = 수소 에너지 저장을 위한 액상유기화합물 기반 수소저장 기술에 관한 연구

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Recently, the instability of the power grid has been increased with the increase in the proportion of fluctuating renewable energy sources. In order to improve the grid stability, technologies to compensate the fluctuations of renewable energy through energy storage systems have been widely studied. Hydrogen energy storage system called regenerative hydrogen fuel cell (RHFC) system is attracting attention because of its ability to store large capacity of energy. Previously, hydrogen was stored by high pressure compression. However, this compressed hydrogen gas (CHG) method has limitations of safety issues and low hydrogen storage density. Liquid organic hydrogen carrier (LOHC) stores hydrogen in the form of liquid organic compounds, allowing safe hydrogen storage at atmospheric pressure, and a high hydrogen storage density. In this study, a comprehensive study was conducted to apply LOHC as a hydrogen storage technology for RHFC systems. First, a net energy analysis was conducted to consider the energy required for system manufacturing and operation. Basic characteristics evaluations were performed on the LOHC material of dibenzyltoluene (DBT), and $Pt/CeO_{2}$ catalysts were developed using glycine nitrate process (GNP), which was capable of synthesizing highly dispersed nano-catalysts to improve dehydrogenation rates. Then, a $20$ $Nm^{3}/h$ LOHC system design was proposed to verify the feasibility of LOHC technology at the system level, and the system was successfully developed and evaluated based on the design. Finally, an energy analysis was carried out on each element technology, and future research and development directions for LOHC technology were suggested. This study will make it possible to store hydrogen more safely with high hydrogen storage density, and the results is applicable to various energy systems utilizing hydrogen in the future.
Advisors
Bae, Joongmyeonresearcher배중면researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 기계공학과, 2020.8,[xi, 194 p. :]

Keywords

Liquid organic hydrogen carrier▼aHydrogen▼aEnergy analysis▼aCatalyst▼aSystem design; 액상유기화학물 기반 수소저장▼a수소▼a에너지 분석▼a촉매▼a시스템 설계

URI
http://hdl.handle.net/10203/284323
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=924311&flag=dissertation
Appears in Collection
ME-Theses_Ph.D.(박사논문)
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