研究者詳細 - 三島　史人

論文 - 三島　史人

分割表示 33 件中 1 - 20 件目／全件表示 >>

Investigation on high gradient magnetic separation for CRUD material in nuclear reactor, 査読

S.Nishijima, N.Nomura, F.Mishima and T.Sekine,

Progress in Superconductivity and Cryogenics 26 ( 3 ) 5 - 8 2024年9月

Research and development of new magnetic filter for high gradient magnetic separation 招待査読国際誌

Shigehiro Nishijima* , Naoki Nomura, and Fumihito Mishima

Progress in Superconductivity and Cryogenics 25 ( 3 ) 1 - 6 2023年9月

We have been developing a new magnetic filter so that small sized paramagnetic substances can be separated even in a low magnetic field (lower than 2T). The developed filter is a packed ferromagnetic filament with a triangular cross section. The filament has a diameter of 120 μm and a length of 3 mm, and is mechanically packed with a volume ratio of 17.6%. Using this filter, a magnetic separation experiment of hematite was carried out using a superconducting magnet at the field of 2T. Similarly, magnetic
separation was performed using a conventional magnetic filter. It became clear that the separation efficiency of newly developed filter is high as that of conventional mesh filter. The smaller sized hematite (<3μm) could be separated though conventional mesh filter could not separate.

Study on multi-stage magnetic separation device for paramagnetic materials operated in low magnetic fields 査読

Fumihito Mishima,Naoki Nomura, Shigehiro Nishijima

Progress in Superconductivity and Cryogenics 25 ( 3 ) 13 - 17 2023年9月

Magnetic separation technology for small paramagnetic particles has been desired for the volume reduction of contaminated soil from the Fukushima nuclear power plant accident and for the separation of scale and crud from nuclear power plants. However, the magnetic separation for paramagnetic particles requires a superconducting high gradient magnetic separation system applied, hence expanding the bore diameter of the magnets is necessary for mass processing and the initial and running costs would be enormous. The use of high magnetic fields makes safe onsite operation difficult, and there is an industrial need to increase the magnetic separation efficiency for paramagnetic particles in as low a magnetic field as possible. Therefore, we have been developing a magnetic separation system combined with a selection tube, which can separate small paramagnetic particles in a low magnetic field. In the previous technique we developed, a certain range of particle size was classified, and the classified particles were captured by magnetic separation. In this new approach, the fluid control method has been improved in order to the selectively classify particles of various diameters by using a multi-stage selection tube. The soil classification using a multi-stage selection tube was studied by calculation and experiment, and good results were obtained. In this paper, we report the effectiveness of the multi-stage selection tube was examined.

Separation of micro-plastics from sea water using electromagnetic archimedes force 査読

Naoki Nomura, Fumihito Mishima, Shigehiro Nishijima

Progress in Superconductivity and Cryogenics 25 ( 3 ) 18 - 21 2023年9月

Pollution of the environment by micro-plastics is now a worldwide problem. Plastics are difficult to decompose and put a great
load on the marine environment. Especially a plastic with a size of 5 mm or less is defined as micro-plastic and are carried by ocean currents over long distances, causing global pollution. These are not easily decomposed in the natural environment. In this paper,
we aimed to experimentally demonstrate that micro-plastics in seawater can be continuously separated by electromagnetic Archimedes force. Using polyethylene particles of 3 mm in diameter as the separation target, a flow channel was fabricated and
separation conditions were investigated by particle trajectory calculations for separation experiments. Based on the calculation
results, a solenoid-type superconducting magnet was used as a source of magnetic field to conduct separation experiments of micro-plastics in seawater. Although a high separation rate was assumed in the simulation results, the experimental results did not show any significant improvement in the separation rate due to the electromagnetic Archimedes force. It was found that the gas generated by the electrolytic reaction may have inhibited the migration of the particles.

Magnetic separation device for paramagnetic materials operated in a low magnetic field 査読

Progress in Superconductivity and Cryogenics 24 ( 3 ) 19 - 23 2022年10月

We have been developing a magnetic separation device that can be used in low magnetic
fields for paramagnetic materials. Magnetic separation of paramagnetic particles with a small
particle size is desired for volume reduction of contaminated soil in Fukushima or separation
of iron scale from water supply system in power plants. However, the implementation of the
system has been difficult due to the needed magnetic fields is high for paramagnetic
materials. This is because there was a problem in installing such a magnet in the site.
Therefore, we have developed a magnetic separation system that combines a selection tube
and magnetic separation that can separate small sized paramagnetic particles in a low
magnetic field. The selection tube is a technique for classifying the suspended particles by
utilizing the phenomenon that the suspended particles come to rest when the gravity acting
on the particles and the drag force are balanced when the suspension is flowed upward. In
the balanced condition, they can be captured with even small magnetic forces. In this study,
we calculated the particle size of paramagnetic particles trapped in a selection tube in a high
gradient magnetic field. As a result, the combination of the selection tube and HGMS (High
Gradient Magnetic Separation-system) can separate small sized paramagnetic particles
under low magnetic field with high efficiency, and this paper shows its potential application.

Study of microp-plastics separation from sea water with electro-magnetic force 査読

N.Nomura, F.Mishima, S.Nishijima

IEEE Transactions on Applied Superconductivity 32 ( 6 ) 3700405 2022年9月

The method of removing micro-plastics from sea water has been developed using electro-
magnetic force. Plastics are difficult to decompose and put a great load on the marine
environment. Especially a plastic with a size of 5mm or less is defined as micro-plastics and
are carried by ocean currents over long distances, causing global pollution. These are not
easily decomposed in the natural environment. The Lorentz force was generated in
simulated sea water and its reaction force was applied to the micro-plastic to control their
motion. The basic principle of this separation method has already been confirmed by basic
experiments. In this study, the magnetic field and current density required to treat seawater
containing micro-plastics using a superconducting magnet with a bore diameter of 5cm were
investigated by simulation. Plastic particles with a diameter of more than 200 μm were
targeted for separation, and various conditions for separation were investigated by
simulation. As a result, it was shown that good separation efficiency was obtained under the
following conditions: flow velocity of 0.2m/s, electrode size of 150mm, current density of
0.93A/cm2,and applied magnetic field of 3T.

Development of novel magnetic separation for paramagnetic particles using the selection tube 査読

: IEEE Transactions on Applied Superconductivity 32 ( 6 ) 3700204 2022年9月

Generally, in order to control and separation of paramagnetic substances by magnetic
force, a superconducting high gradient magnetic separation system applied magnetic field of
about 5T over is required. In this study, we aim to apply a low magnetic field for magnetic
separation of paramagnetic substances. We propose the novel separation method, which is
applying a magnetic field to the selection tube, aiming for more precise and easier
separation than the conventional High Gradient Magnetic Separation System (HGMS).
Selection tube can separate particle mixture into each kinds of particles by the balance of
drag force, buoyancy and gravity depending on flow velocity, particle size, shape and
specific weight. Since the particles are apparent weightless stage, they can be captured with
a relatively small magnetic force. Firstly, we showed the effectiveness of open-gradient
magnetic separation (OGMS: applied magnetic flux density 1.3T) under the selection tube
with using colored glass imitated target substance. The experimental results were found to
show good separation efficiency. Eventually, we tested the HGMS obtained by improving the
novel magnetic separation method, where a low magnetic field applied (maximum magnetic
flux density 0.5T) is applied to magnetic filter (wire diameter 0.8mm, 1.5 mesh, SUS 430)
installed in the selection tube. The effective separation of paramagnetic glass (volume
magnetic susceptibility: +3.17x10-4) was performed successfully with the combination of the
selection tube and HGMS applied low magnetic field.

超電導磁気分離による火力発電所給水系スケール除去査読

西嶋茂宏,三島史人, 岡田秀彦, 廣田憲之, 秋山庸子, 松浦英樹, 山地豪, 難波正徳, 関根智一

電気学会論文誌 B（電力・エネルギー部門誌） 142 1 - 4 2022年1月

study of micro-plastics separation from sea water with electro-magnetic force 査読

Naoki NOMURA ,Fumihito MISHIMA, Shigehiro Nishijima

progress in superconductivity and cryogenics 23 ( 3 ) 10 - 13 2021年9月

Removal of Iron Oxide Scale From Feed-Water in Thermal Power Plant by High-Gradient Magnetic Separation: field experiment 査読

Y.Akiyama,S. Li, T. Mori, H.Okada, N.Hirota, H.Matsuura, T.Yamaji, S.Namba, T.Sekine, F.Mishia,S.Nishijima

progress in superconductivity and cryogenics 23 ( 3 ) 14 - 19 2021年8月

Removal of Iron Oxide Scale From Boiler Feed-Water in Thermal Power Plant by Magnetic Separation-Separation Conditions of Oxygenated Treatment Scale 査読

K. Akiyama, Y.Akiyama, T. Mori, T.Terai, H.Okada, N.Hirota, H.Matsuura, T.Yamaji, S.Namba, T.Sekine, F.Mishia,S.Nishijima

: IEEE Transactions on Applied Superconductivity 31 ( 5 ) 3700204 2021年8月

Removal of Iron Oxide Scale From Feed-Water in Thermal Power Plant by High-Gradient Magnetic Separation: Scale-Up Effect 査読

Tatsuya Mori, Junya Yamamoto, Yoko Akiyama, Hidehiko Okada, Noriyuki Hirota, Hideki Matsuura, Seitoku Namba, Tomokazu Sekine, Fumihito Mishima, Shigehiro Nishijima

IEEE Transactions on Magnetics 56 ( 12 ) 1 - 8 2020年12月

常磁性体の磁気分離に関する流体制御を用いた高度化査読

三島　史人，中岡　俊一，野村　直希

福井工業大学研究紀要 ( 50 ) 103 - 109 2020年10月

Development of magnetic separation system for thermal power plants 査読

Hidehiko Okada, Noriyuki Hirota, Yoko Akiyama, Fumihito Mishima, Shigehiro Nishijima, Hideki Matsuura, Seitoku Namba, Tomokazu Sekine

IEEJ Transactions on electrical and electronics engineering 15 ( 11 ) 1655 - 1662 2020年9月

磁気力制御法による希土類元素含有蛍光体の濃縮回収技術の開発招待査読

西嶋茂宏, 秋山庸子, 三島史人

低温工学 55 ( 3 ) 189 - 194 2020年5月

火力発電所用超電導磁気分離装置の開発

岡田秀彦, 廣田憲之, 秋山庸子, 三島史人, 西嶋茂宏, 松浦英樹, 山地豪, 難波正徳, 関根智一

低温工学 55 ( 3 ) 179 - 184 2020年5月

超電導高勾配磁気分離のセシウム汚染土壌減容への適用可能性招待査読

秋山庸子, 野村直希, 三島史人, 西嶋茂宏

低温工学 55 ( 3 ) 172 - 178 2020年5月

粒子径制御と磁気力を利用した常磁性体の分離法査読

三島史人，島先優弥，柳澤敦也

福井工業大学研究紀要 ( 49 ) 2019年12月

Removal of Scale from Feed-water in Thermal Power Plant by Magnetic Separation -Analysis of Oxygenated Treatment Scale- 査読

M.Hiramatsu, J.Yamamoto, Y.Akiyama, F.Mishima, S.Nishijima, H.Okada, N.Hirota, T.Yamaji, H.Matsuura, S.Namba

Journal of Physics: Conference Series 2019年10月

Removal of Iron Scale from Boiler Feed-water in Thermal Power Plant by Magnetic Separation - Large-scale Experiment - 査読

・ J.Yamamoto, T.Mori, Y.Akiyama, H.Okada, N.Hirota, H.Matsuura, S.Namba, T.Sekine, F.Mishima, S.Nishijima,

IEEE Transactions on Applied Superconductivity 2019年

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