2021/09/20 更新

写真a

チヨ ヒユン ソ
CHO HYUN SEOK
CHO HYUN SEOK
所属
教育研究院 自然科学系 特任助教
工学部 特任助教
職名
特任助教
外部リンク

学位

  • Ph.D ( 2015年3月 )

  • Master ( 2011年8月   INHA University Graduate School )

  • Bachelor ( 2008年8月   INHA University )

研究キーワード

  • 太陽光エネルギー, 水素, 太陽燃料, 熱化学 2 段階水分解サイクル, 金属酸化物

  • CO2 分解

研究分野

  • エネルギー / 地球資源工学、エネルギー学  / 太陽熱 エネルギー

  • ものづくり技術(機械・電気電子・化学工学) / 触媒プロセス、資源化学プロセス  / 水素生産、CO2分解、グリーン水素

経歴(researchmap)

  • 新潟大学   超域研究機構   特任助教   ソーラーコレクター熱燃料化技術の開発に関する国際拠点形成プロジェクト

    2015年4月 - 2017年3月

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    国名:日本国

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  • 新潟大学   自然科学系   特任助教   次世代太陽水素エネルギーシステム人材育成プログラム 特任助教

    2013年2月 - 2015年3月

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    国名:日本国

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  • 韓国エネルギー技術研究院   ソーラー研究グループ   研究員   研究者

    2010年9月 - 2013年1月

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    国名:大韓民国

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経歴

  • 新潟大学   工学部   特任助教

    2017年5月 - 現在

  • 新潟大学   研究推進機構 超域学術院   助教

    2015年4月 - 2017年3月

  • 新潟大学   自然科学研究科   特任助教

    2013年2月 - 2015年3月

 

論文

  • Thermochemical H<inf>2</inf>O splitting using LaSrMnCrO<inf>3</inf> of perovskite oxides for solar hydrogen production

    Nobuyuki Gokon, Kazuki Hara, Naoki Ito, Hiroki Sawaguri, Selvan Bellan, Tatsuya Kodama, Hyun Seok Cho

    AIP Conference Proceedings   2303   2020年12月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    A thermochemical two-step water-splitting cycle using perovskite oxide of La0.7Sr0.3Mn0.9Cr0.1O3 was examined for hydrogen production from water using concentrated solar radiation. The impact of the thermal reduction temperatures of 1000–1350 °C on oxygen/hydrogen productivity and repeatability was examined for hydrogen production at a water decomposition temperature of 1200 °C. The sample displayed relatively high evolution rates of oxygen at TR temperatures of 1350-1300°C, and showed similar rate at TR temperatures of 1000-1200 °C. After the sample was subjected to the TR step at temperatures of 1350-1300 °C, the obtained samples were superior hydrogen production rate to the others. On the other hand, the sample provided relatively good reactivities and repeatabilities for oxygen release and hydrogen production with a small production level without coagulation or sintering during the TR temperatures of 1000-1200 °C.

    DOI: 10.1063/5.0028720

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  • Chemical compatibility of Cu-Ge alloy with container materials for latent heat storage system

    Nobuyuki Gokon, Chew Shun Jie, Selvan Bellan, Tatsuya Kodama, Tsuyoshi Hatamachi, Hyunseok Cho

    AIP Conference Proceedings   2303   2020年12月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    Latent heat storage technology in CSP plant has been studied to enhance the dispatchability of solar energy in order to meet fluctuating electricity needs. A novel concept using metal alloys as latent heat storage material gives way to achieve this technology. In this paper, we analyzed the structural and thermal properties of Cu-Ge alloy to evaluate the potential of metallic PCM for high temperature TES application. Containment options for metallic PCM were explored and the materials are selected for long term operation. Compatibility tests of stainless steel, alumina and SiC ceramics under inert atmosphere were performed at high temperatures (800°C) for a duration of 1 month (720 h) in order to develop a suitable container material for thermal energy storage system.

    DOI: 10.1063/5.0028722

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  • Thermochemical two-step CO<inf>2</inf> splitting using La<inf>0.7</inf>Sr<inf>0.3</inf>Mn<inf>0.9</inf>Cr<inf>0.1</inf>O<inf>3</inf> of perovskite oxide for solar fuel production

    Hiroki Sawaguri, Nobuyuki Gokon, Naoki Ito, Selvan Bellan, Tatsuya Kodama, Hyun Seok Cho

    AIP Conference Proceedings   2303   2020年12月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    A thermochemical two-step water-splitting cycle using perovskite oxide of La0.7Sr0.3Mn0.9Cr0.1O3 was examined for carbon monoxide production from CO2 using concentrated solar radiation. Previously, the authors proved the perovskite oxide can thermochmically split H2O via two-step process into oxygen and hydrogen in an individual step. In this study, a thermochemical two-step CO2 splitting cycle using the perovskite oxide was examined for the reactivity and repeatability of redox reaction at CO2 spitting temperatures of 1000-1200 °C. The reactivity and repeatability for two-step CO2 splitting was compared to those for H2O splitting operating at the same temperature level.

    DOI: 10.1063/5.0028681

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  • Experimental Study of Mn-CeO<inf>2</inf> Coated Ceramic Foam Device for Two-step Water Splitting Cycle Hydrogen Production with 3kW Sun-simulator

    Hyun Seok Cho, Tatsuya Kodama, Nobuyuki Gokon, Selvan Bellan, Naoyoshi Nishigata

    AIP Conference Proceedings   2303   2020年12月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    In this paper, the effect of doping of Manganese on to Cerium oxide for thermochemical two-step water splitting cycle for produce the hydrogen was experimentally studied. In order to compare the oxygen/hydrogen productivity, pure CeO2, coprecipitation method applied Mn-CeO2, and direct doping calcination method adopted Mn-CeO2 were used to thermo-chemical two-step water splitting cycle tests. The synthesized sample powders were coated on the reticulated porous foam device and tested in the fixed bed type reactor for the temperature of 1400 C for thermal reduction step, and 1200 C for water decomposition step through 5 cyclic tests. The redox reactive foam devices were irradiated by 3kW sun-simulator, and all samples recorded successful oxygen/hydrogen production. Among the 3 sample devices, the 15 mol% Mn-CeO2 foam device which synthesized by direct doping calcination method shows highest hydrogen production amount and H2/O2 conversion ratio. o o

    DOI: 10.1063/5.0029890

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  • Numerical analysis on solidification process of PCM in triplex-tube thermal energy storage system

    Koya Hirai, Selvan Bellan, Koji Matsubara, Tatsuya Kodama, Nobuyuki Gokon, Hyun Seok Cho

    AIP Conference Proceedings   2303   2020年12月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    Considerable attention is being paid in recent years to develop and improve alternative technologies to replace fossil fuels due to pollution problems and limited conventional energy sources. Solar thermal energy has been considering as one of the most attractive renewable sources to provide solution to the aforementioned problems. In recent years, latent thermal energy storage systems using phase change materials (PCMs) have been developed to aid energy supply and demand of solar thermal power plants. As one of the obstacles of these systems is the low thermal conductivity of PCMs, ceramic fin has been used in this study to enhance heat transfer rate between the PCM and heat transfer fluid. To assess the heat transfer characteristics of the triplex-tube thermal energy storage system with ceramic fin, a numerical model has been developed and the effect of fin for various Stefan numbers has been studied numerically. The heat transfer and solidification rates are significantly enhanced when connecting the fins between the inner and outer tubes.

    DOI: 10.1063/5.0028873

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  • Thermal charge/discharge performance of iron–germanium alloys as phase change materials for solar latent heat storage at high temperatures

    Nobuyuki Gokon, Chew Shun Jie, Yuya Nakano, Tatsuya Kodama, Selvan Bellan, Hyunseok Cho

    Journal of Energy Storage   30   2020年8月

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    掲載種別:研究論文(学術雑誌)  

    In this study, an iron–germanium alloy (Fe–Ge alloy) was examined as a phase change material at temperatures exceeding 800°C for thermal energy storage in solar thermal applications. The cyclic properties of the thermal charge/discharge of the Fe–Ge alloy were examined at various thermal cycles. A thermal reliability test was performed in the form of a multi-cyclic performance assessment to evaluate the short- and long-term thermal stability of this alloy. Eutectic and hypereutectic chemical compositions of the Fe–Ge alloy were placed in a graphite container under vacuum and an inert atmosphere. The Fe–Ge alloy was experimentally examined for its compatibility with the container material of graphite-carbon. The element distribution of each Fe–Ge alloy was examined via a cyclic performance test. The heat storage capacities were evaluated and compared with those of chloride molten salts. The Fe–Ge alloy exhibits significant potential as a latent heat storage material in next-generation solar thermal applications as it demonstrates various advantages, namely: a higher storage capacity than that of chloride molten salts, temperature followability to the phase diagram, a quick thermal response, satisfactory cyclic behavior of charge/discharge modes, a thermodynamically stable metallographic structure, and non-reactivity with capsulation materials of graphite carbon.

    DOI: 10.1016/j.est.2020.101420

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  • Thermochemical two-step water splitting cycle using perovskite oxides based on LaSrMnO<inf>3</inf> redox system for solar H<inf>2</inf> production

    Nobuyuki Gokon, Kazuki Hara, Yuta Sugiyama, Selvan Bellan, Tatsuya Kodama, Cho Hyun-seok

    Thermochimica Acta   680   2019年10月

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    掲載種別:研究論文(学術雑誌)  

    A thermochemical two-step water-splitting cycle using perovskite oxides based on LaSrMnAlO was examined for hydrogen production from water using concentrated solar radiation. Concurrent Sr and Mn substitutions in La Sr Mn Al O , Sr and Al substitutions in La Sr Mn Al O , and substitution of Al by Cr in La Sr Mn Cr O were examined, and their kinetics, oxygen/hydrogen productivity, and repeatability were compared against LaSrMnAlO . The impact of the chemical compositions of the perovskite oxides was systematically examined at a thermal reduction temperature of 1350 °C and water decomposition temperatures of 1000–1200 °C. From the viewpoints of average amounts of oxygen and hydrogen produced and the H /O ratios, La Sr Mn Cr O and La Sr Mn Cr O provided the most reproducible productions of oxygen and hydrogen in the thermochemical two-step water-splitting cycle. 3 1-x x x 1-x 3 1-y y 1-y y 3 0.7 0.3 1-z z 3 3 2 2 0.7 0.3 0.9 0.1 3 0.7 0.3 0.8 0.2 3

    DOI: 10.1016/j.tca.2019.178374

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  • Heat transfer and particulate flow analysis of a 30 kW directly irradiated solar fluidized bed reactor for thermochemical cycling

    Selvan Bellan, Tatsuya Kodama, Koji Matsubara, Nobuyuki Gokon, Hyun Seok Cho, Kousuke Inoue

    Chemical Engineering Science   511 - 525   2019年8月

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    掲載種別:研究論文(学術雑誌)  

    To perform thermochemical cycles using non-volatile metal oxides to split water and produce hydrogen, a directly irradiated fluidized bed reactor is designed and fabricated for beam-down configuration. As the main aim of this investigation is to analyze the heat transfer and particulate flow of the reactor, chemically inert particles are used. A transient 3D heat and mass transfer model is formulated by the combined approach of discrete element method and computational fluid dynamics. The radiative transfer is solved using the discrete ordinate radiation model. Experimental validation is accomplished by the measured temperatures, obtained with the fluidized bed reactor prototype tested under 30 kW high-flux solar simulator. The model is applied to analyze the granular flow characteristics and efficiency of the reactor for various superficial gas velocities and bed masses. The results indicate that higher gas flow rate increases the velocity and convection loss of the bed and decreases the bed temperature and efficiency of the reactor. th

    DOI: 10.1016/j.ces.2018.09.012

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  • Particles fluidized bed receiver/reactor with a beam-down solar concentrating optics: First performance test on two-step water splitting with ceria using a Miyazaki solar concentrating system

    Tatsuya Kodama, Hyun Seok Cho, Kouske Inoue, Tatsuya Saito, Shouta Watanabe, Nobuyuki Gokon, Selvan Bellan

    AIP Conference Proceedings   2126   2019年7月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    A novel concept of a windowed, particle fluidized bed solar reactor was proposed by Niigata University for performing a two-step thermochemical water splitting cycle with redox metal-oxide particles. The solar reactor concept needs to be combined with a beam-down type solar concentrator. A new type of 100kW beam-down solar concentrating system with a secondly elliptical reflector was built at the campus of University of Miyazaki, Japan. The solar reactor and the CPC were fabricated for demonstrating the concept of the windowed, particle fluidized bed solar reactor. The first performance tests of the solar reactor with pulverized ceria particles with 100 - 300 μm in diameter were carried out using the Miyazaki beam-down solar concentrating system. th

    DOI: 10.1063/1.5117691

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  • Heat transfer and fluid flow analysis of a fluidized bed reactor for beam-down optics

    Selvan Bellan, Tatsuya Kodama, Koji Matsubara, Nobuyuki Gokon, Hyun Seok Cho

    AIP Conference Proceedings   2126   2019年7月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    A transient three dimensional numerical model of the heat transfer and fluid flow of a windowed fluidized bed reactor for solar thermochemical conversions is formulated and solved using discrete element method coupled to computational fluid dynamics. Radiation transfer equation is solved by discrete ordinate radiation model and the particle collision dynamics is solved by spring-dashpot model based on soft-sphere method. The instantaneous granular flow behavior of the irradiated bed is presented along with the incident radiation and particle size distribution. The results indicate that as time progresses the average velocity of the particle increases due to high temperature and bed expansion effect.

    DOI: 10.1063/1.5117684

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  • Fe-doped manganese oxide redox material for thermochemical energy storage at high-temperatures

    Nobuyuki Gokon, Aoi Nishizawa, Takehiro Yawata, Selvan Bellan, Tatsuya Kodama, Hyun Seok Cho

    AIP Conference Proceedings   2126   2019年7月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    Fe-doped manganese oxides for solar thermochemical storage are studied using thermogravimetric reactor in a laboratory scale. The operation process of Fe-doped Mn O /Mn O redox pair for two-step thermochemical cycle are optimized from the viewpoint of redox temperatures and thermochemical storage capacity, and the impact of operation temperatures on redox performances were experimentally evaluated. In addition, the thermochemical storage potentials of some Fe-X-doped manganese oxides are examined with regards to reaction rate, short-term cycling stability, storage capacity and redox temperatures. 2 3 3 4

    DOI: 10.1063/1.5117752

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  • Thermal performance of a 30 kW fluidized bed reactor for solar gasification: A CFD-DEM study

    Selvan Bellan, Tatsuya Kodama, Koji Matsubara, Nobuyuki Gokon, Hyun Seok Cho, Kousuke Inoue

    Chemical Engineering Journal   1287 - 1300   2019年3月

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    掲載種別:研究論文(学術雑誌)  

    Gasification of carbonaceous materials using concentrated solar thermal radiation has been considered as one of the promising renewable pathways to produce syngas. In this study, thermal performance of a recently developed solar thermochemical reactor is presented. To analyze the gas–solid flow and heat transfer characteristics of the reactor, a transient three dimensional numerical model has been developed using discrete element method and computational fluid dynamics. Particle collision dynamics has been solved by the spring-dashpot model based on the soft-sphere method. To perform model verification, experiments have been performed using 30kW fluidized bed reactor prototype under high flux solar simulator. The particulate and thermal characteristics of spout, annulus and fountain of the fluidized bed are analyzed for different irradiation power, loaded powder and gas flow rates. The results indicate that large and small size particles govern the bottom and fountain part of the bed respectively due to gravitational force, and the peak temperature is moved from fountain core to the fountain periphery of the bed when increasing the gas flow rate. th

    DOI: 10.1016/j.cej.2018.10.111

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  • Thermochemical behavior of perovskite oxides based on La<inf>x</inf>Sr<inf>1-x</inf>(Mn, Fe, Co)O<inf>3-Δ</inf> and Ba<inf>y</inf>Sr<inf>1-y</inf>CoO<inf>3-Δ</inf> redox system for thermochemical energy storage at high temperatures

    Nobuyuki Gokon, Takehiro Yawata, Selvan Bellan, Tatsuya Kodama, Hyun Seok Cho

    Energy   171   971 - 980   2019年3月

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    掲載種別:研究論文(学術雑誌)  

    La Sr (Mn, Fe, Co)O , and Ba Sr CoO perovskite oxide powders were investigated as potential thermochemical energy storage (TES) materials operated at high temperatures above 600 °C. The purpose of the research is to provide complete characterization of the impact of partial A- and B-site substitution on the reactivity, kinetics, redox reaction repeatability and charging/discharging storage capacity. The perovskite oxides were investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) at temperatures of 500–1100 °C. Thermal energy storage was evaluated in terms of the enthalpy of the reversible reactions of oxygen release (reduction) and uptake (oxidation) upon heating the oxide materials in air stream. Among the perovskites tested, Ba Sr CoO and Ba Sr CoO powders were suitable thermochemical storage materials operating at above 600 °C in terms of chemical reactivity, charging/discharging temperatures and storage capacities, kinetics of oxygen uptake/release, and repeatability of thermochemical cycling. Further, charging/discharging capacity for both perovskites was comparable to that for Fe-doped manganese oxide. x 1-x 3-δ y 1-y 3-δ 0.3 0.7 3-δ 0.7 0.3 3-δ

    DOI: 10.1016/j.energy.2019.01.081

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  • Development of a 5kW<inf>th</inf> internally circulating fluidized bed reactor containing quartz sand for continuously-fed coal-coke gasification and a beam-down solar concentrating system

    Nobuyuki Gokon, Satoshi Kumaki, Yosuke Miyaguchi, Selvan Bellan, Tatsuya Kodama, Hyunseok Cho

    Energy   166   1 - 16   2019年1月

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    掲載種別:研究論文(学術雑誌)  

    The operational mode of a batch-type fluidized bed reactor containing quartz sand and coal-coke particles was tested under xenon arc lamp (Xe-light) illumination to develop processes for the continuous feeding and gasification of coke particles in the quartz sand fluidized bed. This paper focuses on the fluidizing, heating, and steam gasification performances of a windowed internally circulating fluidized bed reactor. The operational modes explored in this study were: (1) elevated temperature processes associated with the use of Xe-light radiation to reach gasification temperatures, and, (2) the gasification process driving steam gasification at high-temperatures, working with stream gasification of continuously-fed coal-coke. The gasification performances were used to evaluate the performance of quartz sand as a thermal-transfer/sensible heat-storage medium. The peak rate of gas production was greatly enhanced for the high volume fraction of coal-coke. In addition, the light-to-energy conversion rate of 11.0–13.2% and carbon conversion rate up to 80% were reached in the simplified distributor structure of gasification reactor.

    DOI: 10.1016/j.energy.2018.10.036

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  • Particle fluidized bed receiver/reactor with a beam-down solar concentrating optics: Performance test of two-step water splitting with ceria particles using 30-kW<inf>th</inf> sun-simulator

    Tatsuya Kodama, Nobuyuki Gokon, Hyun Seok Cho, Selvan Bellan, Koji Matsubara, Kousuke Inoue

    AIP Conference Proceedings   2033   2018年11月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    The first performance test of a novel windowed solar fluidized bed reactor was carried out for a two-step water splitting cycle with ceria particles by using a 30-kW sun-simulator. O and H were successfully produced by the reactor system. During the thermal reduction step of the two-step water splitting, a fluidized bed of ceria particles was created by passing N gas through the perforated bottom plate of the reactor, and about 30 kW of high flux visible light from 19 xenon-arc lamps of the sun-simulator was directed inside the reactor through a quartz window to directly irradiate the top of the fluidized bed. The central bed temperature reached the temperature of 1400 to 1500°C in the thermal reduction step. The subsequent water decomposition or hydrolysis step was performed at the central bed temperature of 800 - 900°C. About 6 - 12 Ndm of hydrogen was produced by one cycle. th 2 2 2 th 3

    DOI: 10.1063/1.5067143

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  • Preliminary tests of batch type fluidized bed reactor for development of continuously-feeding fluidized bed reactor - An elevated temperature and gasification processes

    Nobuyuki Gokon, Shinpei Takagi, Selvan Bellan, Hyun Seok Cho, Tatsuya Kodama

    AIP Conference Proceedings   2033   2018年11月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    A laboratory-scale prototype windowed internally circulating fluidized-bed reactor made of quartz sand and coal coke particles was investigated for steam gasification using concentrated Xe-light radiation as the energy source. The quartz sand was used as a chemically inert bed material for the fluidized bed, while the coal coke particles functioned as the reacting particles for the endothermic gasification reaction. The purpose of this study is a preliminary tests of batch type fluidized bed reactor that assuming a continuous feeding process of carbonous materials (cokes, coal, and biomass et al.) into the fluidized bed reactor with a thermal transfer/storage medium (quartz sand). The gasification performances such as the production rates of CO, H , and CO were evaluated for the fluidized bed reactor. 2 2

    DOI: 10.1063/1.5067140

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  • CFD-DEM investigation on flow and temperature distribution of ceria particles in a beam-down fluidized bed reactor

    Selvan Bellan, Koji Matsubara, Hyun Seok Cho, Nobuyuki Gokon, Tatsuya Kodama

    AIP Conference Proceedings   2033   2018年11月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    In this research, heat transfer and hydrodynamics of a solar thermochemical fluidized bed reactor filled with ceria particles have been studied numerically and experimentally for beam-down solar concentrating system. A CFD-DEM model has been developed, in which the contact forces between the particles have been calculated by the spring-dashpot model, based on the soft-sphere method. An experimental visualization of particles circulation pattern and mixing of two-tower fluidized bed system has been presented. Simulation results have been compared with experimental data to validate the CFD-DEM model. Results indicate that the model can predict the particle-fluid flow of the two-tower fluidized bed reactor. Using this model, the key operating parameters can be optimized.

    DOI: 10.1063/1.5067137

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  • Heat transfer analysis of 5kW<inf>th</inf> circulating fluidized bed reactor for solar gasification using concentrated Xe light radiation

    Selvan Bellan, Nobuyuki Gokon, Koji Matsubara, Hyun Seok Cho, Tatsuya Kodama

    Energy   160   245 - 256   2018年10月

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    掲載種別:研究論文(学術雑誌)  

    A combined numerical and experimental investigation of hydrodynamics and heat transfer of internally circulating fluidized bed reactor for solar gasification of coal coke to produce syngas is reported. As the main objective of this study is to study the thermal performance of the reactor, chemically inert quartz particles have been used. A numerical model has been developed by the combined approach of computational fluid dynamics and discrete element method (CFD-DEM). The radiation transfer equation has been solved by the discrete ordinate (DO) model. The experimental data have been used for model validation. The thermal performance of the reactor and the spout-annulus flow have been predicted by the model and other hydrodynamic parameters such as internal solid volume fraction, velocity and temperature of the particles are analyzed as a function of superficial gas velocity (gas flow rate) at different initial conditions.

    DOI: 10.1016/j.energy.2018.06.212

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  • Numerical and experimental study on granular flow and heat transfer characteristics of directly-irradiated fluidized bed reactor for solar gasification

    Selvan Bellan, Nobuyuki Gokon, Koji Matsubara, Hyun Seok Cho, Tatsuya Kodama

    International Journal of Hydrogen Energy   43 ( 34 )   16443 - 16457   2018年8月

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    掲載種別:研究論文(学術雑誌)  

    Solar gasification is one of the promising techniques to convert the carbonaceous materials to clean chemical fuels, which offers the advantages of being transportable as well as storable for extended period of time. In this study, thermal performance of a recently developed 5 kW fluidized bed reactor for solar gasification has been investigated and reported. Discrete element method (DEM) has been used for modeling the granular flow, and computational fluid dynamics (CFD) method has been used for modeling the multiphase flow. To validate the developed model, experiments were preformed and compared with modeling results. Discrete ordinate radiation model has been used to solve the radiative transfer equation. The thermal performance of the reactor and particulate flow behavior have been predicted and the effect of particle size, particle size distribution and gas flow rate are analyzed. The results indicate that the performance of the bed increases when fluidizing the annulus region particles as the high porosity increases the diffusion rate of radiation throughout the bed. th

    DOI: 10.1016/j.ijhydene.2018.06.033

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  • A CFD-DEM study of hydrodynamics with heat transfer in a gas-solid fluidized bed reactor for solar thermal applications

    Selvan Bellan, Koji Matsubara, Hyun Seok Cho, Nobuyuki Gokon, Tatsuya Kodama

    International Journal of Heat and Mass Transfer   116   377 - 392   2018年

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    掲載種別:研究論文(学術雑誌)  

    The particles flow and heat transfer characteristics of a high temperature solar thermochemical fluidized bed reactor have been studied for solar beam-down concentrating systems. A numerical model has been developed by the combined approach of computational fluid dynamics (CFD) and discrete element method (DEM) collisional model since it is an effective approach for studying the gas-solid flow. The discrete ordinate model has been used to solve the radiation heat transfer. An experimental visualization of particles circulation pattern and mixing of two-tower fluidized bed system has been presented. A good agreement has been found between the experimental measurements and numerical predictions. The effect of gas superficial velocity, bed mass and inlet gas temperature on the flow pattern and temperature characteristics of the bed have been investigated. The results showed that the maximum and average temperature of the bed, depends on the top layer position and focal point of the concentrated radiation, decreased when increasing the total mass of the bed.

    DOI: 10.1016/j.ijheatmasstransfer.2017.09.015

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▶ 全件表示

共同研究・競争的資金等の研究

  • ソーラー試験による太陽集熱水分解水素製造システムの開発

    研究課題/領域番号:26249151  2014年4月 - 2017年3月

    日本学術振興会  科学研究費助成事業 基盤研究(A)  基盤研究(A)

    児玉 竜也, 金子 宏, 松原 幸治, 清水 忠明, 郷右近 展之, 松葉 正, 横田 昌久, 吉田 一雄

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    配分額:40560000円 ( 直接経費:31200000円 、 間接経費:9360000円 )

    世界のサンベルト地域で太陽集熱によって水を分解して水素を製造する反応システムのプロトタイプの開発を目指し,金属酸化物(反応性セラミック)を媒体とする2段階水熱分解サイクルを用いた2つのタイプのソーラー反応器(円錐型発泡体デバイス式および粒子流動層式)の開発を行った.これらソーラー水熱分解反応器の原理で水素製造が可能であることを,30~40kWth反応器のソーラー試験で立証した.両反応器の実用化の設計概念を検討した結果,流動層式反応器は1サイクル当たりの水素製造能が大きいことかMWth級システムでの実用化に,発泡体式反応器は500kWth程度の小型システムでの実用化に適していることが見出された。

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