Faculty Profiles - KANDA Hideki

Papers - KANDA Hideki

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液化ＤＭＥを水分抽出剤として用いる高水分炭の脱水プロセスの概念設計と所要動力の試算

神田英輝、牧野尚夫

電力中央研究所報告 Vol. M06004 page： 1-11 2007.3

Sublimation Phenomena of Lennard-Jones Fluids in Slit Nanopores Reviewed

Hideki Kanda and Minoru Miyahara

The Journal of Chemical Physics Vol. 126 ( 5 ) page： 054703 2007.2

Language：English Publishing type：Research paper (scientific journal)

Using molecular dynamics simulations, The authors studied the solid-vapor coexistence states of Lennard-Jones methane confined in slit-shaped graphite nanopores. Both the intrapore solid and extrapore vapor were simulated using a unit cell which they previously developed. Frozen critical condensates in the pores were cooled stepwise, and the equilibrium vapor pressure was determined at each temperature. The obtained solid-vapor coexistence curves were remarkably lower than that of the bulk phase. Their thermodynamic model successfully predicts the simulation results without the need to introduce any adjustable parameter, and thus proves its reliability.

Solid-Phase Formation in Nanospace -Phase Diagram of Confined Lennard-Jones Fluids Reviewed

Minoru Miyahara*, Hideki kanda

Peer reviewed 3rd China/Japan Joint Chemical Engineering Symposium page： TQ021 2005.12

Sublimation Phenomena in Slit Nanopores - Lennard-Jones Phase Diagram - Reviewed

Hideki Kanda*, Minoru Miyahara, and Ko Higashitani

Adsorption Vol. 11 ( Suppl. 1 ) page： S295 2005.7

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Sublimation phenomena of Lennard-Jones fluids in slit-shaped nanopores were examined. Vapor-phase pressure at which a solid phase forms in a pore at a constant temperature is determined by the authors' molecular dynamics technique. The obtained phase-boundary pressure is remarkably lower than that of the bulk phase. A simple model of the sublimation is presented, which successfully predicts the molecular dynamics results with no adjustable parameter. Thus, a whole Lennard-Jones phase diagram in slit-shaped nanopores can now be predicted.

DOI： 10.1007/s10450-005-5940-5

Method of Preventing Coal Ash Hardening by Humidifying or Mixing with Additives Reviewed

Yoshiyuro Kishi, Hideki Kanda*, Hiromi Shirai, Yoshimichi Daijyou

Journal of Society of Powder Technology, Japan Vol. 42 ( 7 ) page： 460 2005.7

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

The aim of this study is to prevent the hardening of coal ash during transportation from power plants and storage. In order to prevent the coal ash from hardening, humidification and mixing with additives were applied. As a result, (1) humidification of coal ash at 40°C with air of 50-90%RH, the hardenability of coal ash greatly decreased because sulfur trioxide on the surface of the coal ash reacted with alkaline components such as calcium carbonate by humidification, (2) miximg coal ash with lime stone is the most effective method in reducing the hardenability because it reacts with the sulfur trioxide. The addition of 1-10% lime stone is necessary to prevent hardening.

DOI： 10.4164/sptj.42.460

Numerical Analysis of Coal Ash Bed Hardening by Water Condensation Reviewed

Masashi Wada, Hideki Kanda*, Mitsuhiko Hata, Hisao Makino, Chikao Kanaoka

Journal of Society of Powder Technology, Japan Vol. 42 ( 5 ) page： 317 2005.5

Language：English Publishing type：Research paper (scientific journal)

In this study, hardening phenomena of coal ash beds in high-humidity condition are examined. We employ a diffusion simulation in clarifying the distribution of condensed water in coal ash beds, in which water vapor is absorbed into sulfur trioxide adhered on the surface of coal ash particles. Aqueous sulfuric acids solution formed by the absorption is in equilibrium with the ambient water vapor. The diffusion rate of water vapor is proportional to the difference between the pressure and ambient water vapor pressure. The simulation successfully describes the results of previous experiment, at a constant temperature, with the variations in the equilibrium moisture and particle diameter of coal ash. Moreover, it is clarified that the relationship between water content and hardening phenomena is very similar for various coal ashes, with a correction of particle diameter of coal ash and the volume of condensate bridging between particles.

DOI： 10.4164/sptj.42.317

液化ＤＭＥ脱水法による石炭脱水機構－分子動力学による脱水挙動の把握と脱水平衡式の構築－

神田英輝、白井裕三、日恵井佳子

電力中央研究所報告 Vol. W04012 page： 1-8 2005.3

Study on Influential Factor in Hardening Phenomena of Coal Ash Bed Reviewed

Kouichi Higashiyama, Hideki Kanda*, Hiromi Shirai, Hisao Makino, Ryouichi Kurose

Journal of Society of Powder Technology, Japan Vol. 41 ( 7 ) page： 508 2004.7

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

In this study, we examined influences of temperature, humidity and coal ash characteristics on hardening phenomena of coal ash beds. Coal ash beds were moistened and hardened at a high relative humidity and we found that hardening is prevented by removing sulfur trioxide on the surface of coal ash, e. g., by washing it in water or by contacting it with ammonia gas. Therefore, sulfur trioxide on the surface of coal ash plays an important role on the hardening of coal ash bed. In addition, moistened coal ash bed was hardened more by drying. The mechanism of hardening is such that alkaline materials in coal ash react with sulfuric acid formed by the adsorbed moisture and sulfur trioxide to produce sulfates by the neutralization reaction. Crystalline of sulfate, which is formed by drying, interconnects coal ash particles.

DOI： 10.4164/sptj.41.508

Triple point of Lennard-Jones Fluid in Slit Nanopore: Solidification of Critical Condensate Reviewed

Hideki Kanda, Minoru Miyahara and Ko Higashitani

The Journal of Chemical Physics Vol. 120 ( 13 ) page： 6173-6179 2004.4

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

We report the results of a molecular dynamics simulation that looked for the triple point of Lennard-Jones fluid in slit-shaped nanopores. The simulation method employed for this purpose is able to maintain vapor?liquid coexistence in a nanopore at a specific equilibrium bulk-phase pressure. The triple point is the freezing point of the critical condensate. The triple-point temperature could be higher or lower than the bulk triple point, depending on the pore size. This is thought to be due to two opposing factors: the elevating effect of the pore-wall potential energy, and the depressing effect of the capillary condensate's tensile condition. Because of the cancellation, the deviation of the triple-point temperature from the bulk triple-point temperature was not considered significant. The pressure of the triple point, however, was significantly different from that of the bulk triple point. A simple model to describe the triple point is developed and shown to agree well with the results of the simulation. The importance of the two factors in nanoscale pores, which cannot be described by the classic Gibbs?Thomson equation, is emphasized.

DOI： 10.1063/1.1652431

石炭の簡易脱灰技術の基礎検討　－脱灰性能におよぼす粉砕方式の影響－

日恵井佳子、白井裕三、神田英輝

電力中央研究所報告 Vol. W03023 page： 1-12 2004.3

Detection of Freezing Point Elevation in Slit Nanospace by Atomic Force Microscopy Reviewed

Minoru Miyahara*, Masanobu Sakamoto, Hideki Kanda, and Ko Higashitani

Peer reviewed Proceedings of The 3rd Pacific Basin Conference on Adsorption Science and Technology page： 234 2003.5

簡易脱灰技術の基礎検討－石炭中灰分の分布状態と比重分離法による灰分除去特性の評価－

香川佳子、白井裕三、神田英輝

電力中央研究所報告 Vol. W01019 page： 1-11 2003.3

石炭の簡易脱灰技術の基礎検討－脱灰性能におよぼす石炭中灰分分布状態および粉砕粒径の影響－

日恵井佳子、白井裕三、神田英輝

電力中央研究所報告 Vol. W03002 page： 1-9 2003.3

Freezing Point Elevation in Nanospace detected directly by Atomic Force Microscopy Reviewed

Minoru Miyahara*, Masanobu Sakamoto, Hideki Kanda and Ko Higashitani

Studies in Surface Science and Catalysis Vol. 144 page： 411 2002.12

微粉炭火力用燃料の多様化 -環境性の向上と発電コストの低減-

牧野尚夫、池田道隆、日恵井佳子、神田英輝、小野哲夫

電中研レビュー Vol. 46 page： 87-100 2002.11

溶剤置換法による石炭脱水技術の検討－液化ＤＭＥによる脱水手法の基礎検討－

神田英輝、白井裕三、香川佳子

電力中央研究所報告 Vol. W01013 page： 1-18 2002.6

Triple Point in Slit Nanopore: Determination by Molecular Dynamics and its Modeling Reviewed

Minoru Miyahara*, Hideki Kanda and Ko Higashitani

Peer reviewed Proceedings of Fundamentals of Adsorption 7 page： 975 2002.5

簡易脱灰技術の基礎検討－顕微鏡画像を用いた石炭中灰分分布状態の定量化手法の検討－

香川佳子、白井裕三、神田英輝

電力中央研究所報告 Vol. W01016 page： 1-14 2002.3

ナノ細孔内相転移モデルの構築と検証およびナノ細孔特性評価法への応用

神田英輝

日本吸着学会誌 Vol. 15 ( 1 ) page： 12-17 2001.4

石炭の簡易脱灰技術の基礎検討－石炭中灰分の分布状態と比重分離法による灰分除去特性の評価－

香川佳子、白井裕三、神田英輝

電力中央研究所報告 Vol. W00019 page： 1-11 2001.3

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