Faculty Profiles - NARUSE Ichiro

Papers - NARUSE Ichiro

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Reduction of ash deposition in pulverized coal fired boilers

Naruse I., Yoshiie R., Ueki Y., Matsuura M., Naganuma H.

Cleaner Combustion and Sustainable World - Proceedings of the 7th International Symposium on Coal Combustion page： 517 - 522 2012

Language：English Publishing type：Research paper (scientific journal) Publisher：Cleaner Combustion and Sustainable World - Proceedings of the 7th International Symposium on Coal Combustion

This study proposes reduction technology of ash deposition on the heat exchanger tube in pulverized coal fired (PCF) boilers. Thermal spraying technique is adopted to change the surface properties of tube to reduce the ash deposition. As a result, Ni alloy as a thermal spraying material played an effective role to reduce the deposition under both the ash deposition experiments and the actual coal combustion experiments. However, it is necessary to change ash types in order to evaluate that the thermal spraying technology is universally useful or not. If this technology will be applied to the commercialized PCF boilers, additionally, the effectiveness for the long-term will also be studied as well as the theoretical elucidation on the reduction of ash deposition must be discussed. In this study, therefore, four types of coal ash with different melting points were tested as samples for the ash deposition experiments. The long-term ash adhesion experiments were also carried out, using a precise tension tester at high temperature. As the theoretical approaches, the compositions of each ash particle depositing on the tube surface were analyzed by a computer-controlled scanning electron microscope (CCSEM) with electron dispersive spectroscopy (EDS) detector, thereby the interfacial reactions between the ash deposition layer and the heat exchanger tube were discussed. Those results obtained were also compared to the results obtained by the thermal equilibrium calculations. © Tsinghua University Press, Beijing and Springer-Verlag Berlin Heidelberg 2012.

Scopus

Refinement of Waste Lubricant Oil Using Rubber Membrane Extraction Method Open Access

YOSHIIE Ryo

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B Vol. 78 ( 789 ) page： 1048 - 1052 2012

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

A process to recover base oil from waste lubricating oil is proposed in this study, which is based on solvent extraction with membrane. In this process, organic solvent is circulated in a closed loop, leading to a resource saving. Residue consists of only impurities in waste lubricating oil, such as suspended particles, aqueous droplets, soot and tar, leading to a waste reducing. This process includes a fractional distillation, too, but it is for separating out organic solvent from oils. Then, temperature for fractional distillation is lower than 100 °C, leading to an energy saving. Rubber film is utilized as membrane, whose polymer network structure works as filter to separate impurities from oil dissolved in solvent. In order to verify the feasibility of this process, effect of extraction period, solvent volume and extraction temperature on both yield and quality of the extracted oil was experimentally estimated.

DOI： 10.1299/kikaib.78.1048

Scopus

CiNii Research

国際協力機構・インドネシア高等教育開発計画プロジェクトに携わって

成瀬一郎

日本エネルギー学会誌 = Journal of the Japan Institute of Energy Vol. 89 ( 10 ) page： 947 2010.10

Reaction characteristic of woody biomass with CO<inf>2</inf>and H <inf>2</inf>O

Naruse I., Ueki Y., Isayama T., Shinba T., Kihedu J., Yoshiie R.

Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan Vol. 96 ( 4 ) page： 151 - 154 2010.6

Language：English Publishing type：Research paper (scientific journal) Publisher：Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

Objective in this study is to elucidate the fundamental gasification characteristics for carbonaceous resources. Effects of temperature and gaseous agents on the gasification characteristics of carbonaceous materials were experimentally and theoretically studied by the gasification of woody sawdust, using an electrically heated drop tube furnace. Results of the co-gasification of CO2 with H2O were compared by the gasification by a single gaseous agent such as CO2 or H2O. As a result, H2 and CO concentrations increased with an increase of temperature. CO concentration under the co-gasification condition produced more than that under the single gasification condition. The H2 formation showed the opposite tendency to the CO formation during the co-gasification. This synergy effect was also elucidated theoretically by the simulation of reaction kinetics. The simulated temperature indicating the maximum synergy effect on CO formation agreed well with that obtained by the experiments.

Scopus

NOx Formation/Destruction Characteristics in Sewage Sludge Combustion

Naruse Ichiro, Hirabayashi Miwa, Yoshiie Ryo, Ueki Yasuaki

Journal of the Japan Society of Material Cycles and Waste Management Vol. 21 ( 6 ) page： 193 - 201 2010

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Material Cycles and Waste Management

Pyrolysis and combustion experiments of dried sewage sludge were conducted using an electrically heated drop furnace to elucidate NOx formation/destruction characteristics. When the dried sewage sludge was fed into the drop furnace, the particle temperature rose rapidly and the particles swelled. The char particle structure became balloon-like. Regarding NOx formation, both NO and N2O were formed during combustion. After N2O was generated in the flame, NO was produced because N2O was destroyed by H radicals formed by CO oxidation. Although conversion of fuel-N into N2O decreased with increased furnace temperature, conversion of fuel-N into NO increased. The N2O conversion ratio of the dried sewage sludge was higher than that of the sample coal because the dried sewage sludge emits more HCN, which more readily produces N2O.

DOI： 10.3985/jjsmcwm.21.193

CiNii Research

Theoretical Study on Desulfurization Characteristics in a Fluidized Bed Combustor

MURAKAMI Takahiro, KURITA Noriyuki, NARUSE Ichiro

Journal of High Temperature Society Vol. 36 ( 1 ) page： 41 - 46 2010

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：High Temperature Society of Japan

Sulfur oxides (SOx) are one of the main sources of acid rain. In a fluidized bed combustor, limestone is a directly supplied into the combustor, as a desulfurizer in order to decrease the emissions of SOx from fuel, such as sewage sludge and coal. In our previous studies, NaCl-doped limestone has a good performance on the desulfurization characteristics. In the present study, the effect of alkali metal compounds NaCl, KCl and LiCl-dopings on the formation of CaO crystal structure was simulated by the molecular dynamics method. The result indicates that KCl in KCl-doped CaO deforms more largely the CaO crystal structure than NaCl, because K atom tends to separate from Cl atom at high temperature due to larger ionic radius of K than that of Na. For LiCl-doped CaO, LiCl also deforms the CaO crystal structure, because Li, whose ionic radius is smaller than that of Na, can move freely inside the CaO crystal lattice at high temperature. Based on the results obtained by the molecular dynamics simulations, only the NaCl-doping into CaO has a positive effect on the CaO crystallization. Consequently, this NaCl-doping may enhance the desulfurization efficiency. From this viewpoint, the molecular dynamics simulation can well explain the relationship between the desulfurization efficiency of CaO and the effect of alkali metal compounds addition into CaO.

DOI： 10.7791/jhts.36.41

CiNii Research

Reaction Characteristic of Woody Biomass with CO2 and H2O

Naruse Ichiro, Ueki Yasuaki, Isayama Tsutomu, Shinba Takanori, Kihedu Joseph H., Yoshiie Ryo

Tetsu-to-Hagane Vol. 96 ( 4 ) page： 150 - 155 2010

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Iron and Steel Institute of Japan

Objective in this study is to elucidate the fundamental gasification characteristics for carbonaceous resources. Effects of temperature and gaseous agents on the gasification characteristics of carbonaceous materials were experimentally and theoretically studied by the gasification of woody sawdust, using an electrically heated drop tube furnace. Results of the co-gasification of CO2 with H2O were compared by the gasification by a single gaseous agent such as CO2 or H2O. As a result, H2 and CO concentrations increased with an increase of temperature. CO concentration under the co-gasification condition produced more than that under the single gasification condition. The H2 formation showed the opposite tendency to the CO formation during the co-gasification. This synergy effect was also elucidated theoretically by the simulation of reaction kinetics. The simulated temperature indicating the maximum synergy effect on CO formation agreed well with that obtained by the experiments.

DOI： 10.2355/tetsutohagane.96.150

Scopus

CiNii Research

Using sorbents to control heavy metals and particulate matter emission during solid fuel combustion

Yao Hong, Naruse Ichiro

PARTICUOLOGY Vol. 7 ( 6 ) page： 477 - 482 2009.12

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

Some of the heavy metals in coal and wastes vaporize during combustion, concentrate in fine particulates, and emit with the flue gas into the atmosphere, to produce adverse effect on environment and health. This study first investigates the fate of the heavy metal species, especially Pb, Cd and Cr, known as semi-volatile, in various flue gases, especially in the presence of HCl and SO2, by chemical equilibrium calculation, in which, Si and Ca were proposed as base sorbent materials to capture Pb, Cd and Cr. Then Si- and Ca-based compounds as well as waste materials used as sorbents were optimized to capture the heavy metals. Finally, the optimal sorbent was tested in actual burning of dried sewage sludge as solid fuel, to evaluate the effectiveness of the sorbent. Calculated results show that Cl increases the volatility of most heavy metals, while SO2 enhances formation of condensed phases. Among the sorbents tested, kaolin appears most efficient to capture Pb and Cd. For sludge combustion with kaolin addition, both Pb and Cd were shifted from sub-micron to macro-sized particles, and accompanied by considerable decrease of 0.1 μm particles. © 2009.

DOI： 10.1016/j.partic.2009.06.004

Web of Science

Scopus

Introduction of Research Group (Department of Mechanical Science & Engineering, Nagoya University)

Vol. 88 ( 1 ) page： 81 - 84 2009.1

Elucidation of Ash Deposition Mechanisms with Interfacial Reaction

NAGANUMA Hiroshi, IKEDA Nobuya, ITO Tadashi, SATO Fumio, URASHIMA Kazuaki, TAKUWA Tsuyoshi, YOSHIIE Ryo, NARUSE Ichiro

Journal of the Japan Institute of Energy Vol. 88 ( 9 ) page： 816 - 822 2009

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

In order to control ash deposition on heat exchanger tubes in coal or woody biomass combustion boilers, surface treatment of the tubes, using a thermal spraying technique, was proposed in this study. The ash deposition mechanisms were elucidated, based on physical and chemical aspects, under the condition of long exposure period. First, adhesive force (Sb) between ash and alloy surface at high temperature was measured. As the physical aspect, Sb increased with an increase of the exposure time and could be predicted by an improved logistic function. Moreover, Sb depended on the temperature, so that an interface reaction controlled the increasing rate of adhesive force. As the chemical aspect, the interface between the ash deposition and alloy was observed and analyzed by a SEM-EDS and a FE-EPMA to consider the mechanisms of an increase of the adhesive force. The result showed that S and Na contained in the ash composition diffused into the alloy and that Fe mainly composing of the alloy specimens also diffused into the ash deposition. The diffusion coefficient of Fe into the ash deposition was also calculated by the results of a point elemental analysis. These results suggested that the interfacial reactions of the ash particles with the alloy affected the increase of adhesive force.

DOI： 10.3775/jie.88.816

Scopus

CiNii Research

Reaction Behaviors in Packed-Bed Woody Biomass Gasifier(Thermal Engineering)

TAKUWA Tsuyoshi, TORIGOE Takashi, YOSHIIE Ryo, NARUSE Ichiro

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B Vol. 75 ( 752 ) page： 810 - 816 2009

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

Gasification technology is recognized as one of the candidates to utilize the biomass effectively. From this viewpoint, this study focused fundamentals on woody biomass gasification, using a labscale packed-bed. In this experiment, pellets of black pine are gasified, using air as the gasification agent. The gasification tests were carried out under both updraft and downdraft conditions. The temperature distribution inside the gasifier and the compositions of gasified gas were measured and analyzed during gasification by thermo-couples inserted from a furnace wall and a micro gas chromatograph, respectively. The produced gasses before cooling were also sampled to analyze amount of tar generation in the gasses. As a result, the lower heating value of the produced gas under the downdraft condition was higher than that under the updraft condition. It was easier to operate under the downdraft condition than under the updraft. Under the updraft condition, bridging phenomenon happened. Amount of tar generation under the downdraft condition was lower than that under the updraft. This is because tar passes through a partial combustion zone or higher temperature zone in the downdraft gasifier.

DOI： 10.1299/kikaib.75.752_810

Scopus

CiNii Research

燃焼プロセスにおける微量成分を含む微粒子の生成挙動と炉内吸収技術

成瀬一郎

工業加熱 46 page： 31 - 37 2009

界面反応を伴う石炭灰付着機構の解明 Reviewed

義家亮, 成瀬一郎

日本エネルギー学会誌 88,2 page： 816 - 822 2009

Dependence of deposit behavior of combustion ash on coal types

NAGANUMA Hiroshi, IKEDA Nobuya, NARUSE Ichiro, YOSHIIE Ryo, UEKI Yasuaki, MATSUURA Mikio, ITO Tadashi, SATAKE Hideshi

Proceedings of Conference on Coal Science Vol. 46 ( 0 ) page： 126 - 127 2009

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

In pulverized coal fired boilers, molten ash particles generated during combustion have possibility of adhesion on surface of heat exchanger tubes. This causes problems of heat transfer inhibition such as slagging and fouling as well as boiler trouble on operation. In order to solve this problem, surface treatment technology of the heat exchanger tubes is developed in this study. This paper describes dependence of the adhesive force between the deposition layer and the tube surface on the coal types.

DOI： 10.20550/jiesekitanronbun.46.0_126

CiNii Research

The Release Behavior of Boron in Coal Combustion

NODA Naoki, MATSUDA Hiromitsu, Ito Shigeo, UEKI Yasuaki, YOSHIIE Ryo, NARUSE Ichiro

Proceedings of Conference on Coal Science Vol. 46 ( 0 ) page： 144 - 145 2009

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

Boron contained in coal are partly released to the flue gas during combustion. Boron are captured in flue gas cleaning systems and the emissions of these elements are generally low. However, it is important to understand the behavior of boron to improve the reliability of the gas cleaning systems. Though a lot of researches examined the behavior of boron, the behavior of these elements in coal combustion has not been clarified in detail yet. In this research, the release behavior of boron from coal was investigated using a drop tube furnace (DTF). As a result, it is thought that a part of the boron would be absorbed in molten slag during combustion.

DOI： 10.20550/jiesekitanronbun.46.0_144

CiNii Research

Regeneration of waste lubricating oil by solvent extraction with membrane

Miwa Takahiro, Yoshiie Ryo, Ueki Yasuaki, Naruse Ichiro

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management Vol. 20 ( 0 ) page： 125 - 125 2009