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Yoko Akiyama,Suqin Li,Koshiro Akiyama,Tatsuya Mori,Hidehiko Okada,Noriyuki Hirota,Tsuyoshi Yamaji,Hideki Matsuura,Seitoku Namba,Tomokazu Sekine,Fumihito Mishima,Shigehiro Nishijima 한국초전도저온공학회 2021 초전도와 저온공학 Vol.23 No.3
The reduction of carbon dioxide emissions becomes a global issue, the main source of carbon dioxide emissions in the Asian region is the energy conversion sector, especially coal-fired power plants. We are working to develop technologies that will at least limit the increase in carbon dioxide emissions from the thermal power plants as one way to reduce carbon dioxide emissions. Our research aims to reduce carbon dioxide emissions by removing iron oxide scale from the feedwater system of thermal power plants using a superconducting high-gradient magnetic separation (HGMS) system, thereby reducing the loss of power generation efficiency. In this paper, the background of thermal power plants in Asia is outlined, followed by a case study of the introduction of a chemical cleaning line at an actual thermal power plant in Japan, and the possibility of introducing it into the thermal power plants in China based on the results.
Akiyama, Yoko,Li, Suqin,Akiyama, Koshiro,Mori, Tatsuya,Okada, Hidehiko,Hirota, Noriyuki,Yamaji, Tsuyoshi,Matsuura, Hideki,Namba, Seitoku,Sekine, Tomokazu,Mishima, Fumihito,Nishijima, Shigehiro The Korean Society of Superconductivity and Cryoge 2021 한국초전도저온공학회논문지 Vol.23 No.3
The reduction of carbon dioxide emissions becomes a global issue, the main source of carbon dioxide emissions in the Asian region is the energy conversion sector, especially coal-fired power plants. We are working to develop technologies that will at least limit the increase in carbon dioxide emissions from the thermal power plants as one way to reduce carbon dioxide emissions. Our research aims to reduce carbon dioxide emissions by removing iron oxide scale from the feedwater system of thermal power plants using a superconducting high-gradient magnetic separation (HGMS) system, thereby reducing the loss of power generation efficiency. In this paper, the background of thermal power plants in Asia is outlined, followed by a case study of the introduction of a chemical cleaning line at an actual thermal power plant in Japan, and the possibility of introducing it into the thermal power plants in China based on the results.
Nishimura, Ryosei,Akiyama, Yoko,Manabe, Yuichiro,Sato, Fuminobu The Korean Society of Superconductivity and Cryoge 2021 한국초전도저온공학회논문지 Vol.23 No.3
Advanced classification of Cs contaminated soil by using a magnetic force-assisted selection pipe was investigated. A selection pipe is a device that sort particles depending on their particle size, based on the relationship between buoyancy, drag, and gravity force acting on the particles. Radioactive cesium is concentrated in small-particle size soil components with a large specific surface area. Hence, the volume of the Cs contaminated soil can be reduced by recycling the large-particle size soil components with low radioactive concentration. One of the problems of the selection pipe was that the radioactive concentration of the stayed soil in the selection pipe exceeds 8000 Bq/kg, which is the standard value of recycling of Cs contaminated soil, due to low classification accuracy. In this study, magnetic fields were applied to the lab-scale selection pipe from upper side to improve the classification accuracy and to reduce the radioactive concentration of the stayed soil.
Fundamental study on cancer therapy by blocking newborn blood vessels by magnetic force control
Makoto KIRIMURA,Yoko AKIYAMA,Shigehiro NISHIJIMA 한국초전도.저온공학회 2018 한국초전도저온공학회논문지 Vol.20 No.2
In this study, a cancer treatment by accumulating and aggregating ferromagnetic particles in newborn blood vessels was examined. It is necessary for this treatment to control dispersion-aggregation property of ferromagnetic particles. Ferromagnetic particles required in this method disperse at low magnetic field, aggregate at high magnetic field and maintain the aggregation even after removal of the magnetic field. In order to control the dispersion-aggregation property, the surface of magnetite particles was modified with higher fatty acids having different lengths. As a result, we succeeded to prepare propionic acid-modified magnetite particles that form irreversible aggregation by magnetic field. The model experiments simulating newborn blood vessels showed that these particles can block the flow by the magnetic field, and the blockage was maintained after removal of the magnetic field.
Study on separation of nonferrous metal utilizing magneto-Archimedes method
Yusuke Ito,Yoko Akiyama 한국초전도.저온공학회 2019 한국초전도저온공학회논문지 Vol.21 No.2
In order to improve resource value, separation of nonferrous metals obtained from crushed materials of home appliances is required. In this study, we aimed to develop a continuous separation system by magneto-Archimedes method using magnetic fluid as a medium and the permanent magnet as a magnetic field source. Firstly, the separation conditions were examined in which only copper is settled and the difference in levitation positions between aluminum and other metals are over 1 cm. Based on the results, levitation experiment of each metal and separation experiment from the mixture of nonferrous metals were confirmed. The separation experiment showed that the continuous separation of copper and aluminum from a mixture of nonferrous metals is possible.
Fundamental study on sustainable treatment system of mine water using magnetized solid catalyst
Chisato Mukuta,Yoko Akiyama 한국초전도.저온공학회 2019 한국초전도저온공학회논문지 Vol.21 No.2
In the mine exploration sites, sustainable treatment system of mine water with energy saving and minimized chemical additives is required. Since most of the mine water contains highly-concentrated ferrous ion, it is necessary to study on the removal method of iron ions. We propose the system consisting of two processes; precipitation process by air oxidation using solid catalyst-modified magnetite and separation process combining gravitational sedimentation and magnetic separation using a permanent magnet. Firstly, in the precipitation process (a former process of the system), we succeeded to prepare solid catalyst-modified magnetite. Air oxidation using solid catalyst-modified magnetite using Fe2(SO4)3 as a starting material showed high iron removal capability. Secondly, in the separation process (latter process of the system), solid catalyst-modified magnetite using Fe2(SO4)3 as a starting material can be separated by a superconducting bulk magnet and a permanent magnet.
Fundamental study on sustainable treatment system of mine water using magnetized solid catalyst
Mukuta, Chisato,Akiyama, Yoko The Korea Institute of Applied Superconductivity a 2019 한국초전도저온공학회논문지 Vol.21 No.2
In the mine exploration sites, sustainable treatment system of mine water with energy saving and minimized chemical additives is required. Since most of the mine water contains highly-concentrated ferrous ion, it is necessary to study on the removal method of iron ions. We propose the system consisting of two processes; precipitation process by air oxidation using solid catalyst-modified magnetite and separation process combining gravitational sedimentation and magnetic separation using a permanent magnet. Firstly, in the precipitation process (a former process of the system), we succeeded to prepare solid catalyst-modified magnetite. Air oxidation using solid catalyst-modified magnetite using $Fe_2(SO_4)_3$ as a starting material showed high iron removal capability. Secondly, in the separation process (latter process of the system), solid catalyst-modified magnetite using $Fe_2(SO_4)_3$ as a starting material can be separated by a superconducting bulk magnet and a permanent magnet.
Study on separation of nonferrous metal utilizing magneto-Archimedes method
Ito, Yusuke,Akiyama, Yoko The Korea Institute of Applied Superconductivity a 2019 한국초전도저온공학회논문지 Vol.21 No.2
In order to improve resource value, separation of nonferrous metals obtained from crushed materials of home appliances is required. In this study, we aimed to develop a continuous separation system by magneto-Archimedes method using magnetic fluid as a medium and the permanent magnet as a magnetic field source. Firstly, the separation conditions were examined in which only copper is settled and the difference in levitation positions between aluminum and other metals are over 1 cm. Based on the results, levitation experiment of each metal and separation experiment from the mixture of nonferrous metals were confirmed. The separation experiment showed that the continuous separation of copper and aluminum from a mixture of nonferrous metals is possible.
Study on removal of microplastics using magnetic separation
Reo Ueda,Yoko Akiyama,Yuichiro Manabe,Fuminobu Sato 한국초전도저온학회 2022 한국초전도저온공학회논문지 Vol.24 No.3
In recent years, the impact of microplastics (MPs) on ecosystems is a serious problem. Since MPs are difficult to recover oncethey are dispersed into the environment, it is important to remove them at the source. We proposed a magnetic separation of primaryMPs (plastics manufactured in minute sizes) sized 10-100 μm that has not been removed in the sewage process, based on themagnetic seeding process. In this study, we used magnetite as a magnetic seeding agent, and conducted magnetic separationexperiments in the continuous process using a superconducting solenoidal magnet to investigate the feasibility of practical magneticseparation system of MPs. As a result, 85% separation rate was obtained by continuous separation using high gradient magneticseparation (HGMS) with hydrophobically treated magnetite as a magnetic seeding agent.