Faculty Profiles - NARUSE Ichiro

Papers - NARUSE Ichiro

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Effect of Liquid Phase on Deposition Behaviors of Coal Ash

NAGANUMA Hiroshi, NARUSE Ichiro, MIYAUCHI Yoshiki, KAWAI Takayuki, ITOH Tadashi, MIKI Yoshiharu, AIZAWA Iichiro, KARINO Katsuhiro

Journal of the Japan Institute of Energy Vol. 86 ( 2 ) page： 102 - 108 2007.2

Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

In order to prevent adhesion of molten ash particles on the surface of heat exchanger tubes in coal combustion boilers, surface treatment of the tubes, using a thermal spray coating techniaue, is conducted in this study. As one of the important mechanisms of ash adhesion relates to liquid-bridge force between the tube surface and the molten ash particles, contact angle of the liquid-phase on the surface for the simulated molten ash particles was measured, varying types of coating metal species. The ash deposition experiments on the coated tubes were also conducted, using a ertical furnace under the high-temperature condition. The result showed that the two values of the wettability and the slagging factor of the ash particles deposited could evaluate the ash adhesion characteristics. The wettablity could be controlled by changing types of the coating metal species. The amount of ash deposition increased with an increase of the slagging factor. Especially, sodium and potassium compounds were concentrated in the position apart from 60 egrees from the stagnation point. These results suggest that the surface treatment of the tubes, using a thermal spray coating technique, can control the ash deposition behaviors.

Emission control of sodium compounds and their formation mechanisms during coal combustion Reviewed

T. Takuwa and I. Naruse

Proceedings of the Combustion Institute Vol. 31 page： 2863-2870 2007

Role of Methanol on Supercritical Water Oxidation of Ammonia, Reviewed

Suzugaki H.,Naruse I.Quitain,A.T.,Daimon,H.,Fujie,K.

Ind.Eng.Chem.Res. Vol. 46 page： 3566-3573 2007

Detailed kinetic and control of alkali metal compounds during coal combustion Reviewed

Tsuyoshi Takuwa and Ichiro Naruse

Fuel Processing Technology Vol. 88 ( 11-12 ) page： 1029-1034 2007

Detailed kinetic and control of alkali metal compounds during coal combustion Reviewed

Tsuyoshi Takuwa, Ichiro Naruse

Fuel Processing Technology Vol. 88 ( 11-12 ) page： 1029-1034 2007

Effect of Liquid Phase on Deposition Behaviors of Coal Ash

NAGANUMA Hiroshi, NARUSE Ichiro, MIYAUCHI Yoshiki, KAWAI Takayuki, ITOH Tadashi, MIKI Yoshiharu, AIZAWA Iichiro, KARINO Katsuhiro

Journal of the Japan Institute of Energy Vol. 86 ( 2 ) page： 102 - 108 2007

Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

In order to prevent adhesion of molten ash particles on the surface of heat exchanger tubes in coal combustion boilers, surface treatment of the tubes, using a thermal spray coating technique, is conducted in this study. As one of the important mechanisms of ash adhesion relates to liquid-bridge force between the tube surface and the molten ash particles, contact angle of the liquid-phase on the surface for the simulated molten ash particles was measured, varying types of coating metal species. The ash deposition experiments on the coated tubes were also conducted, using a vertical furnace under the high-temperature condition. The result showed that the two values of the wettability and the slagging factor of the ash particles deposited could evaluate the ash adhesion characteristics. The wettablity could be controlled by changing types of the coating metal species. The amount of ash deposition increased with an increase of the slagging factor. Especially, sodium and potassium compounds were concentrated in the position apart from 60 degrees from the stagnation point. These results suggest that the surface treatment of the tubes, using a thermal spray coating technique, can control the ash deposition behaviors.

DOI： 10.3775/jie.86.102

Scopus

Emission control of sodium compounds and their formation mechanisms during coal combustion

Takuwa T.

Proceedings of the Combustion Institute Vol. 31 II page： 2863 - 2870 2007

Emission control of sodium compounds and their formation mechanisms during coal combustion Reviewed

T. Takuwa, I. Naruse

Proceedings of the Combustion Institute Vol. 31 page： 2863-2870 2007

Role of coal utilization technologies for suatainable society

Naruse Ichiro

PROCEEDINGS OF THE 6TH INTERNATIONAL SYMPOSIUM ON COAL COMBUSTION page： 23 - 29 2007

Role of Methanol on Supercritical Water Oxidation of Ammonia, Reviewed

Suzugaki H, Naruse I.Quitain,A.T, Daimon,H, Fujie,K

Ind.Eng.Chem.Res. Vol. 46 page： 3566-3573 2007

1-18 Temperature dependency of adhesive bond of coal ash on metal surface

NAGANUMA Hiroshi, IKEDA Nobuya, NARUSE Ichiro, KAWAI Takayuki, ITO Tadashi, IGARASHI Yoshiaki

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 16 ( 0 ) page： 36 - 37 2007

37 Prediction of Ash Deposition Characteristics during Pulverized Coal Combustion

NARUSE Ichiro, KAWAI Takayuki

Proceedings of Conference on Coal Science Vol. 44 ( 0 ) page： 74 - 75 2007

Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

In pulverized coal combustors, molten ash particles generated during combustion have possibility of adhesion on surface of heat exchanger tubes. This ash deposition layer formed plays a role for insulation surrounding the tubes. In order to prevent this problem, it is, first, necessary to predict ash deposition characteristics. In this paper, not only amount of the ash deposition was measured experimentally, but also that amount was compared with amount of the slag-liquid phase calculated by the thermal equilibrium theory. As a result, the amount of slag-liquid phase calculated could be correlated with the amount of ash deposition obtained experimentally.

DOI： 10.20550/jiesekitanronbun.44.0_74

Genetic susceptibility in the neural tube defects induced by ochratoxin A in the genetic arhinencephaly mouse, Pdn/Pdn.

Ohta K, Maekawa M, Katagiri R, Ueta E, Naruse I

Congenital anomalies Vol. 46 ( 3 ) page： 144 - 8 2006.9

Mercury emissions and species during combustion of coal and waste

Yao H.

Energy and Fuels Vol. 20 ( 5 ) page： 1946 - 1950 2006.9

Mass Balance and Formation Mechanism of Trace Metals in High Temperature Processes

NINOMIYA Yoshihiko, NARUSE Ichiro

Chemical engineering of Japan Vol. 70 ( 7 ) page： 329 - 334 2006.7

Mechanisms of fine particulates formation with alkali metal compounds during coal combustion

Takuwa T.

Fuel Vol. 85 ( 5-6 ) page： 671 - 678 2006.3

Ash Behaviors and Deposition Phenomena in Coal Gasification

NARUSE Ichiro, YAMASHITA Toru, AKIMOTO Akemitsu

Journal of the Japan Institute of Energy Vol. 85 ( 1 ) page： 20 - 27 2006.1

Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

This report deals with comprehensive studies on ash formation, ash deposition and growth of the deposition layer during gasification. For the ash formation, both the coagulation model for the included mineral particles and the splitting model for the excluded mineral particles are developed, based on the experimental and analytical results obtained. For the ash deposition process, the ash deposition characteristics depend on properties of ash in raw coals, especially for the melting temperature. The fine ash particles selectively adhere at the initial stage of deposition. The ash compositions of the depositing particles differ from those of the ash particles in the char particles before deposition. For growth of the ash deposition layer, both the melting tests for several types of coal ash and the chemical equilibrium calculations on the molten phases of some ash compositions contribute to modeling the growth behaviors of ash deposition layer during gasification. Finally, the actual coal gasification tests are conducted at atmospheric pressure, using a bench-scale coal gasifier, to confirm the validity of some models developed in these studies.

Ash behaviors and deposition phenomena in coal gasification

Naruse I.

Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy Vol. 85 ( 1 ) page： 20 - 27 2006.1

Mechanisms of Fine Particulates Formation with Alkali Metal Compounds during Coal Combustion Reviewed

T. Takuwa, I. S. N. Mkilaha and I. Naruse

Fuel Vol. 85 page： 671-678 2006

Mercury Emissions and Species during Combustion of Coal and Waste Reviewed

Hong Yao, Guangqian Luo, Minghou Xu, Tamotsu Kameshima and Ichiro Naruse

Energy & Fuels Vol. 20 page： 1946-1950 2006

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