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Journal Articles

Introduction of loop operating system to improve the stability of continuous hydrogen production for the thermochemical water-splitting iodine-sulfur process

Tanaka, Nobuyuki; Takegami, Hiroaki; Noguchi, Hiroki; Kamiji, Yu; Myagmarjav, O.; Kubo, Shinji

International Journal of Hydrogen Energy, 46(55), p.27891 - 27904, 2021/08

The thermochemical water-splitting iodine-sulfur (IS) process enables producing hydrogen. In a previous operation procedure, after the components of the unit operations were individually started, they were connected at the same time. However, it was challenging to stably interconnect the components. This study introduces a new loop operation, subdividing the process configuration into four sections before transferring the continuous operation. The proposed loop operation was validated analyzing the material and heat balances of each section. The calculated results showed that the material balances of respective loop sections were closed. The loop operation mode would transfer to the continuous operation by connect all sections. Regarding the switching of operation modes, the material and heat balance showed no or little difference, indicating that two operation modes could only be changed by switching the pipelines. Consequently, the loop sections could be individually operated to stabilize the IS process system, and the loop operation could be smoothly transferred to the continuous operation.

Journal Articles

Fabrication, permeation, and corrosion stability measurements of silica membranes for HI decomposition in the thermochemical iodine-sulfur process

Myagmarjav, O.; Shibata, Ai*; Tanaka, Nobuyuki; Noguchi, Hiroki; Kubo, Shinji; Nomura, Mikihiro*; Takegami, Hiroaki

International Journal of Hydrogen Energy, 46(56), p.28435 - 28449, 2021/08

 Times Cited Count:0 Percentile:0.01(Chemistry, Physical)

Journal Articles

Development of a membrane reactor with a closed-end silica membrane for nuclear-heated hydrogen production

Myagmarjav, O.; Tanaka, Nobuyuki; Nomura, Mikihiro*; Noguchi, Hiroki; Imai, Yoshiyuki; Kamiji, Yu; Kubo, Shinji; Takegami, Hiroaki

Progress in Nuclear Energy, 137, p.103772_1 - 103772_7, 2021/07

 Times Cited Count:1 Percentile:81.22(Nuclear Science & Technology)

Journal Articles

Hydrogen production using thermochemical water-splitting iodine-sulfur process test facility made of industrial structural materials; Engineering solutions to prevent iodine precipitation

Noguchi, Hiroki; Kamiji, Yu; Tanaka, Nobuyuki; Takegami, Hiroaki; Iwatsuki, Jin; Kasahara, Seiji; Myagmarjav, O.; Imai, Yoshiyuki; Kubo, Shinji

International Journal of Hydrogen Energy, 46(43), p.22328 - 22343, 2021/06

An iodine-sulfur process offers the potential for mass producing hydrogen with high-efficiency, and it uses high-temperature heat sources, including HTGR, solar heat, and waste heat of industries. R&D tasks are essential to confirm the integrity of the components that are made of industrial materials and the stability of hydrogen production in harsh working conditions. A test facility for producing hydrogen was constructed from corrosion-resistant components made of industrial materials. For stable hydrogen production, technical issues for instrumental improvements (i.e., stable pumping of the HIx solution, improving the quality control of glass-lined steel, prevention of I$$_{2}$$ precipitation using a water removal technique in a Bunsen reactor) were solved. The entire process was successfully operated for 150 h at the rate of 30 L/h. The integrity of components and the operational stability of the hydrogen production facility in harsh working conditions were demonstrated.

Journal Articles

High temperature gas-cooled reactors

Takeda, Tetsuaki*; Inagaki, Yoshiyuki; Aihara, Jun; Aoki, Takeshi; Fujiwara, Yusuke; Fukaya, Yuji; Goto, Minoru; Ho, H. Q.; Iigaki, Kazuhiko; Imai, Yoshiyuki; et al.

High Temperature Gas-Cooled Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.5, 464 Pages, 2021/02

As a general overview of the research and development of a High Temperature Gas-cooled Reactor (HTGR) in JAEA, this book describes the achievements by the High Temperature Engineering Test Reactor (HTTR) on the designs, key component technologies such as fuel, reactor internals, high temperature components, etc., and operational experience such as rise-to-power tests, high temperature operation at 950$$^{circ}$$C, safety demonstration tests, etc. In addition, based on the knowledge of the HTTR, the development of designs and component technologies such as high performance fuel, helium gas turbine and hydrogen production by IS process for commercial HTGRs are described. These results are very useful for the future development of HTGRs. This book is published as one of a series of technical books on fossil fuel and nuclear energy systems by the Power Energy Systems Division of the Japan Society of Mechanical Engineers.

Journal Articles

Comparison of experimental and simulation results on catalytic HI decomposition in a silica-based ceramic membrane reactor

Myagmarjav, O.; Tanaka, Nobuyuki; Nomura, Mikihiro*; Kubo, Shinji

International Journal of Hydrogen Energy, 44(59), p.30832 - 30839, 2019/11

 Times Cited Count:7 Percentile:46.26(Chemistry, Physical)

Journal Articles

Research and development on membrane IS process for hydrogen production using solar heat

Myagmarjav, O.; Iwatsuki, Jin; Tanaka, Nobuyuki; Noguchi, Hiroki; Kamiji, Yu; Ioka, Ikuo; Kubo, Shinji; Nomura, Mikihiro*; Yamaki, Tetsuya*; Sawada, Shinichi*; et al.

International Journal of Hydrogen Energy, 44(35), p.19141 - 19152, 2019/07

 Times Cited Count:12 Percentile:67.04(Chemistry, Physical)

Journal Articles

Module design of silica membrane reactor for hydrogen production via thermochemical IS process

Myagmarjav, O.; Tanaka, Nobuyuki; Nomura, Mikihiro*; Kubo, Shinji

International Journal of Hydrogen Energy, 44(21), p.10207 - 10217, 2019/04

 Times Cited Count:11 Percentile:63.61(Chemistry, Physical)

Journal Articles

Hydrogen production tests by hydrogen iodide decomposition membrane reactor equipped with silica-based ceramics membrane

Myagmarjav, O.; Tanaka, Nobuyuki; Nomura, Mikihiro*; Kubo, Shinji

International Journal of Hydrogen Energy, 42(49), p.29091 - 29100, 2017/12

 Times Cited Count:16 Percentile:57.58(Chemistry, Physical)

The catalytic decomposition of hydrogen iodide in a membrane reactor using silica membranes derived from hexyltrimethoxysilane (HTMOS) was investigated for the production of hydrogen in the thermochemical water splitting iodine-sulfur process. The silica membranes were prepared by counter-diffusion chemical vapor deposition using porous alumina support tubes in both the absence and presence of a $$gamma$$-alumina layer. The silica membranes formed on $$gamma$$-alumina-coated $$alpha$$-alumina tubes displayed a higher H$$_{2}$$ permeance than that formed directly on an $$alpha$$-alumina tube. A silica membrane based on a 1.5 $$mu$$m-thick $$gamma$$-alumina layer fabricated under deposition conditions of 450$$^{circ}$$C, 1200 s, and a N$$_{2}$$ carrier gas velocity of 0.044 m s$$^{-1}$$ exhibited a high H$$_{2}$$ permeance of 9.4 $$times$$ 10$$^{-7}$$ mol Pa$$^{-1}$$ m$$^{-2}$$ s$$^{-1}$$ while maintaining an H$$_{2}$$/N$$_{2}$$ selectivity of over 80.0. The performance of a membrane reactor based on an HTMOS-derived silica membrane was evaluated at 400$$^{circ}$$C by measuring the HI conversion and H$$_{2}$$ flow rates. The conversion was approximately 0.48 when the HI flow rate was 9.7 mL min$$^{-1}$$.

Journal Articles

Preparation of an H$$_{2}$$-permselective silica membrane for the separation of H$$_{2}$$ from the hydrogen iodide decomposition reaction in the iodine-sulfur process

Myagmarjav, O.; Ikeda, Ayumi*; Tanaka, Nobuyuki; Kubo, Shinji; Nomura, Mikihiro*

International Journal of Hydrogen Energy, 42(9), p.6012 - 6023, 2017/03

 Times Cited Count:17 Percentile:59.75(Chemistry, Physical)

Oral presentation

Development of a silica membrane for H$$_{2}$$ production from HI decomposition in the IS process

Myagmarjav, O.; Ikeda, Ayumi*; Nomura, Mikihiro*; Kubo, Shinji

no journal, , 

In this study, we have developed a highly hydrogen permeable silica membrane derived from hexyltrimethoxysilane as a Si precursor using porous alumina support. Modification of alumina support tubes in the absence of and in the presence of $$gamma$$-alumina coating was carried out by a counter diffusion chemical vapor deposition (CVD). A membrane with intermediate $$gamma$$-alumina layer showed higher H$$_{2}$$ permeance (7.7 $$times$$ 10$$^{-7}$$ mol m$$^{-2}$$ s$$^{-1}$$ Pa$$^{-1}$$) than that formed directly on the $$alpha$$-alumina tube (3.8 $$times$$ 10$$^{-8}$$ mol m$$^{-2}$$ s$$^{-1}$$ Pa$$^{-1}$$). It was found that the thickness of $$gamma$$-alumina layer played an important role in the improvement of membrane permeation performance. Modified membrane based on $$gamma$$-alumina coating with a thickness of 1.5 $$mu$$m exhibited H$$_{2}$$/SF$$_{6}$$ selectivity over 3000 at 270$$^{circ}$$C, while maintaining H$$_{2}$$ permeance in the order of 10$$^{-7}$$ mol m$$^{-2}$$ s$$^{-1}$$ Pa$$^{-1}$$. The results led to the conclusion that the modified membrane is a promising candidate for further enhancement of HI decomposition in membrane reactor.

Oral presentation

A Highly hydrogen permeable silica membrane supported on a porous alumina for the hydrogen production

Myagmarjav, O.; Ikeda, Ayumi*; Nomura, Mikihiro*; Kubo, Shinji

no journal, , 

The thermal decomposition of hydrogen iodide (HI) to produce hydrogen in a membrane reactor was investigated using the separation characteristics of a silica membrane with the aim of improving the one-pass decomposition rate of HI decomposition reaction in the thermochemical IS process. The silica membranes were prepared by a counter diffusion chemical vapor deposition (CVD) of hexyltrimethoxysilane (HTMOS) using alumina porous support. The membrane reactor phenomenon was evaluated using determined H$$_{2}$$ production rate from HI decomposition at 400$$^{circ}$$C. It was found from experiments that produced H$$_{2}$$ rate was approximately 1.5 mL min$$^{-1}$$ in permeated site. Hydrogen was successfully produced and extracted from the HI decomposition membrane reactor with a utilization of the HTMOS silica membrane. The HTMOS silica membrane was effective for the HI decomposition at higher reaction temperature of 400$$^{circ}$$C in the membrane reactor.

Oral presentation

Development of membrane Bunsen reactor in IS process for high efficient hydrogen production

Myagmarjav, O.; Inagaki, Yoshiyuki; Kubo, Shinji; Ioka, Ikuo; Tanaka, Nobuyuki; Iwatsuki, Jin; Noguchi, Hiroki; Kamiji, Yu; Sakaba, Nariaki

no journal, , 

no abstracts in English

Oral presentation

Research and development program of membrane IS process for hydrogen production using solar heat

Sakaba, Nariaki; Inagaki, Yoshiyuki; Myagmarjav, O.; Noguchi, Hiroki; Iwatsuki, Jin; Tanaka, Nobuyuki; Kamiji, Yu; Ioka, Ikuo; Kubo, Shinji

no journal, , 

The research and development program of the IS process using the membrane technology and solar heat is now on progress aiming at improvement of the hydrogen production efficiency up to 40%. In the H$$_{2}$$SO$$_{4}$$ decomposition reaction process, oxygen production process, the decomposition rate of sulphur trioxide (SO$$_{3}$$) is expected more than 80% at the reaction temperature of 800 - 900$$^{circ}$$C. On the other hand, the decomposition rate of SO$$_{3}$$ decreases to around 30% in the reaction temperature of 600$$^{circ}$$C which temperature will be provided by solar heat, ceramic oxygen permselective membrane and catalyst have been developing to promote SO$$_{3}$$ decomposition in the reaction temperature of 600$$^{circ}$$C. In addition, the ceramic hydrogen permselective membrane and catalyst to promote HI decomposition for hydrogen production, the cation-exchange membrane and catalyst to reduce amount of iodine in the HI circulation process. Also, the corrosion-resistance material to use metal components in the H$$_{2}$$SO$$_{4}$$ decomposition process is underway. This work was supported by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), energy carrier (Funding agency: JST).

Oral presentation

R&D status of heat utilization technologies for high-temperature gas-cooled reactor and solar energy

Myagmarjav, O.; Iwatsuki, Jin; Tanaka, Nobuyuki; Noguchi, Hiroki; Kamiji, Yu; Ioka, Ikuo; Nomura, Mikihiro*; Yamaki, Tetsuya*; Tsuru, Toshinori*; Machida, Masato*; et al.

no journal, , 

Oral presentation

Development of a ceramic membrane reactor for hydrogen production from HI decomposition

Myagmarjav, O.; Tanaka, Nobuyuki; Nomura, Mikihiro*; Kubo, Shinji

no journal, , 

Oral presentation

Challenge for adapting a hydrogen permselective membrane reactor to improve thermochemical IS process

Myagmarjav, O.; Tanaka, Nobuyuki; Nomura, Mikihiro*; Kubo, Shinji

no journal, , 

Oral presentation

Massive and efficient H$$_{2}$$ production technology on thermochemical water-splitting iodine-sulfur process

Takegami, Hiroaki; Tanaka, Nobuyuki; Noguchi, Hiroki; Kamiji, Yu; Iwatsuki, Jin; Myagmarjav, O.; Inagaki, Yoshiyuki; Kubo, Shinji

no journal, , 

A thermochemical water-splitting iodine-sulfur process offers the potential for the mass production of hydrogen at high levels of efficiency. This chemical process uses high-temperature heat sources such as the high-temperature gas-cooled reactors, solar heat, and waste heat. Raw materials of H$$_{2}$$O splits into H$$_{2}$$ and O$$_{2}$$ with combining three chemical reactions using sulfur and iodine compounds. Currently important R&D tasks are to verify integrity of components made of practical-structural materials and stability of hydrogen production operation in the harsh working conditions, and to develop methods for high thermal efficiency. A test facility of hydrogen production was constructed applying corrosion-resistant components developed using industrial materials. The entire process connecting the three process chemical sections was operated in hydrogen production for 31 hours at rate of 20 L / h. Through the operations, technical issues were obtained that prevention of clogging and leakage are important for next longer operation. For improvement of thermal efficiency, membrane technologies have been devised for HI decomposition section, H$$_{2}$$SO$$_{4}$$ decomposition section, and Bunsen reaction section. Permselective membranes (H$$_{2}$$, O$$_{2}$$) and a cation exchange membrane were developed to adopt to membrane reactors which work to increase chemical equilibrium and to reduce processing energy of chemical reactions.

Oral presentation

Study on a membrane reactor equipped with the one-end-closed silica membrane for hydrogen iodide decomposition

Myagmarjav, O.; Tanaka, Nobuyuki; Nomura, Mikihiro*; Kubo, Shinji

no journal, , 

Oral presentation

Development of ceramic membranes for large-scale hydrogen production via thermochemical iodine-sulfur process

Myagmarjav, O.; Tanaka, Nobuyuki; Noguchi, Hiroki; Kubo, Shinji; Nomura, Mikihiro*; Takegami, Hiroaki

no journal, , 

24 (Records 1-20 displayed on this page)