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JAEA Reports

Development of dissolved hydrogen concentration control apparatus by solid polymer electrolyte water electrolysis method

Nakano, Hiroko; Fuyushima, Takumi; Tsuguchi, Akira*; Nakamura, Mutsumi*; Takeuchi, Tomoaki; Takemoto, Noriyuki; Ide, Hiroshi

JAEA-Technology 2022-007, 34 Pages, 2022/06

JAEA-Technology-2022-007.pdf:3.35MB

In order to investigate the phenomenon of stress corrosion cracking (SCC) for structural materials at the light water reactor (LWR), it is important to manage a water quality for simulating high-temperature and high-pressure water. Generally, dissolved hydrogen (DH) concentration in water loop has been controlled by the bubbling method of pure hydrogen gas or standard gas with high hydrogen concentration. However, it is necessary to equip the preventing hydrogen explosion in the area installed experimental apparatus. In general, in order to prevent accident by hydrogen, it is required to take measures such as limiting the amount of leakage, eliminating hydrogen, shutting off the power supply, and suppressing combustion before an explosion occurs. Thus, the dissolved hydrogen concentration control apparatus by electrolysis method has been developed which has two electrolysis cells to control DH concentration by electrolyzing water loop. In this study, small basic experimental devices were set up. The preliminary data were acquired regarding the simple performance of two electrolysis cells and the change of DH concentration in circulation. Based on the preliminary data, the dissolved hydrogen concentration control apparatus was designed to be connected to the high-temperature and high-pressure water loop test equipment. This report describes the test results with the small basic experimental devices for the design of the dissolved hydrogen concentration control apparatus.

Journal Articles

Microscopic dynamics of lithium diffusion in single crystal of the solid-state electrolyte La $_{2/3-x}$ Li $_{3x}$ TiO $_{3}$ (x = 0.13) studied by quasielastic neutron scattering

Matsuura, Masato*; Fujiwara, Yasuyuki*; Moriwake, Hiroki*; Ohara, Koji*; Kawakita, Yukinobu

Physical Review B, 104(9), p.094305_1 - 094305_7, 2021/09

https://doi.org/10.1103/PhysRevB.104.094305

Times Cited Count：5 Percentile：44.86(Materials Science, Multidisciplinary)

Journal Articles

Correlated Li-ion migration in the superionic conductor Li $_{10}$ GeP $_{2}$ S $_{12}$

Yajima, Takeshi*; Hinuma, Yoyo*; Hori, Satoshi*; Iwasaki, Rui*; Kanno, Ryoji*; Ohara, Takashi; Nakao, Akiko*; Munakata, Koji*; Hiroi, Zenji*

Journal of Materials Chemistry A, 9(18), p.11278 - 11284, 2021/05

https://doi.org/10.1039/D1TA00552A

Times Cited Count：19 Percentile：80.41(Chemistry, Physical)

Journal Articles

Quantitative evaluation of CO $_{2}$ emission reduction of active carbon recycling energy system for ironmaking by modeling with Aspen Plus

Suzuki, Katsuki*; Hayashi, Kentaro*; Kurihara, Kohei*; Nakagaki, Takao*; Kasahara, Seiji

ISIJ International, 55(2), p.340 - 347, 2015/02

https://doi.org/10.2355/isijinternational.55.340

Times Cited Count：19 Percentile：64.17(Metallurgy & Metallurgical Engineering)

Use of the Active Carbon Recycling Energy System in ironmaking (iACRES) has been proposed for reducing CO $_{2}$ emissions. To evaluate the performance of iACRES quantitatively, a process flow diagram of a blast furnace model with iACRES was developed using Aspen Plus, a chemical process simulator. CO $_{2}$ emission reduction and exergy analysis were performed by using mass and energy balance obtained from simulation results. The following CO $_{2}$ reduction methods were evaluated as iACRES: solid oxide electrolysis cells (SOEC) with CO $_{2}$ capture and separation (CCS), SOEC without CCS, and a reverse water-gas shift reactor powered by a high-temperature gas-cooled reactor. iACRES enabled CO $_{2}$ emission reduction by 3-11% by recycling CO and H $_{2}$ , whereas effective exergy ratio decreased by 1-7%.

Journal Articles

Process modeling of iACRES by ASPEN Plus and evaluation of the whole system

Hayashi, Kentaro*; Suzuki, Katsuki*; Kurihara, Kohei*; Nakagaki, Takao*; Kasahara, Seiji

Tanso Junkan Seitetsu Kenkyukai Saika Hokokusho; Tanso Junkan Seitetsu No Tenkai, p.27 - 41, 2015/02

Applying Active Carbon Recycling Energy System to ironmaking (iACRES) process is a promising technology to reduce coal usage and CO $_{2}$ emissions. To evaluate performance of iACRES quantitatively, a process flow diagram of the blast furnace model with iACRES was developed using Aspen Plus. CO $_{2}$ emission reduction and exergy analysis was predicted by using mass and energy balance obtained from the simulation results. The followings were investigated as iACRES: solid oxide electrolysis cells (SOEC) with CO $_{2}$ capture and separation (CCS), SOEC without CCS, and a reverse water-gas shift reactor as the a CO $_{2}$ reduction reactor powered by a high-temperature gas-cooled reactor. iACRES could provide CO $_{2}$ emission reductions of 3-11% by recycling CO and H $_{2}$ , whereas the effective exergy ratio decreased by 1-7%.

Journal Articles

Hierarchical structure-property relationships in graft-type fluorinated polymer electrolyte membranes using small- and ultrasmall-angle X-ray scattering analysis

Tran Duy, T.*; Sawada, Shinichi; Hasegawa, Shin; Yoshimura, Kimio; Oba, Yojiro*; Onuma, Masato*; Katsumura, Yosuke*; Maekawa, Yasunari

Macromolecules, 47(7), p.2373 - 2383, 2014/04

https://doi.org/10.1021/ma500111x

Times Cited Count：30 Percentile：70.08(Polymer Science)

The hierarchical structures of graft-type ETFE-based polymer electrolyte membranes (ETFE-PEMs) were investigated using small- and ultrasmall-angle X-ray cattering experiments. The ETFE-PEMs with IECs 2.4 mmol/g possessed conducting graft domains around lamellar crystals, with a d-spacing of 21.8-29.1 nm, and oriented crystallites with short and long correlation distances of 218-320 and 903-1124 nm, respectively. The membranes with IECs 2.7 mmol/g showed a new phase of crystallite network domains with a d-range of 225-256 nm, indicating a phase transition from oriented crystallite to crystallite network structures in the IEC range of 2.4-2.7 mmol/g. Noted that for the ETFE-PEMs with high IECs higher conductivity at 30% RH and compatible tensile strengths at 100% RH and 80 $^{circ}$ C, compared with Nafion, originated from the well-interconnected ion channels around the crystallites and the remaining lamellar crystals and crystallites, respectively.

Journal Articles

Performance improvement of fluoropolymer electrolyte membranes by radiation processing

Yamaki, Tetsuya; Asano, Masaharu; Yoshida, Masaru

Gekkan Eko Indasutori, 10(6), p.5 - 11, 2005/06

https://ci.nii.ac.jp/naid/40006791220

no abstracts in English

Journal Articles

Fluoropolymer-based electrolyte membranes for stable fuel-cell operation even in low humidity environment; Development by radiation chemical methods for PEFC applications

Yamaki, Tetsuya; Asano, Masaharu; Yoshida, Masaru

Kogyo Zairyo, 53(1), p.63 - 67, 2005/01

https://ci.nii.ac.jp/naid/40006547339

no abstracts in English

Journal Articles

Development of highly proton-conductive membranes based on crosslinked fluoropolymers by radiation chemical methods

Yamaki, Tetsuya; Yoshida, Masaru

Nenryo Denchi, 4(3), p.73 - 78, 2005/01

no abstracts in English

Journal Articles

Polyelectrolyte membranes based on crosslinked polytetrafluoroethylene

Yamaki, Tetsuya; Asano, Masaharu; Yoshida, Masaru

Kogyo Zairyo, 51(4), p.39 - 42, 2003/04

https://ci.nii.ac.jp/naid/80015805714

no abstracts in English

Journal Articles

Extraction of europium(III) into W/O microemulsion containing aerosol OT and a bulky diamide, 1; Cooperative effect

Suzuki, Hideya*; Naganawa, Hirochika; Tachimori, Shoichi

Solvent Extraction and Ion Exchange, 21(4), p.527 - 546, 2003/03

https://doi.org/10.1081/SEI-120022519

Times Cited Count：12 Percentile：45.03(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Electricity and hydrogen multi production process with new solid electrolyte for HTGR, 1; Tri-generation process into thermal-electricity-chemical energy

Ishiyama, Shintaro

Nihon Genshiryoku Gakkai Wabun Rombunshi, 2(1), p.14 - 23, 2003/01

https://doi.org/10.3327/taesj2002.2.14

no abstracts in English

Journal Articles

Styrene grafted and sulfonated proton conducting membranes based on radiation-crosslinked polytetrafluoroethylene and their fuel cell applications

Yamaki, Tetsuya; Asano, Masaharu; Morita, Yosuke*; Suwa, Takeshi*; Yoshida, Masaru

Proceedings of 9th International Conference on Radiation Curing (RadTech Asia '03) (CD-ROM), 4 Pages, 2003/00

Proton exchange membranes were prepared by the radiation-induced grafting of styrene into crosslinked polytetrafluoroethylene (PTFE) films and subsequent sulfonation. The degree of grafting was controlled in the range of 7-75% by the crosslinking density of the PTFE matrix as well as the grafting conditions. The films at the grafting yield of 30% were found to give the ion exchange membranes with a homogeneous distribution of sulfonic acid groups. The resulting membranes showed a large ion exchange capacity reaching 2.9 meq g $^{-1}$ , which exceeded the performance of commercially-available perfluorosulfonic acid films such as Nafion. This will encourage the use of our ion exchange membranes in polymer electrolyte fuel cells.