Faculty Profiles - NARUSE Ichiro

Papers - NARUSE Ichiro

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1-01　Influence of char structure on gasification behavior of pulverized coal

NEGISHI Takamasa, UEKI Yasuaki, YOSHIIE Ryo, NARUSE Ichiro, NAKANO Kaoru

Proceedings of Conference on Coal Science Vol. 57 ( 0 ) page： 2 - 3 2020

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

Currently, pulverized coal is blown into blast furnaces to reduce the amount of coke used in the steelmaking process. On the other hand, in recent years, the grade of coal has been declining due to the increase in the use of coal, and the company has been forced to respond to the diversification of coal types. Therefore, in this study, we used a batch furnace to prepare three types of coal char, and then the cross-sectional observation of the char by SEM and specific surface area analysis by BET method using N2 were carried out. Coal with porous particles and high specific surface area values was found to have very high gasification reactivity for both CO2 and H2, while coal with balloon-type particles with large cavities inside the particles and low specific surface area values was found to have lower gasification reactivity.

DOI： 10.20550/jiesekitanronbun.57.0_2

4-11　Degradation behavior of solid oxide fuel cell（SOFC）with trace hydrocarbons

ZHANG Hui, YOSHIIE Ryo, NARUSE Ichiro, UEKI Yasuaki

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 29 ( 0 ) page： 130 - 131 2020

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

In this study, effects of tar-containing fuel gas on the SOFC with Ni-YSZ as anode electrode are evaluated. The simulated gas was hydrogen contaminated with toluene as model substance of tar. Electrochemical behaviors were investigated under several toluene concentrations in wet (2.3vol% H2O) H2 at 850°C during 30h using constant current measurement and impedance analysis in order to assess the SOFC's stability. Constant current measurements were conducted under 200mA/cm2 mainly and impedance analysis was conducted under OCV conditions. Experimental results show that the presence of tar dramatically reduces the electrochemical performance of SOFC even under a low concentration of 100ppm. It was also indicated this reduction tend to be serious when concentration of toluene increase.

DOI： 10.20550/jietaikaiyoushi.29.0_130

Direct analysis of saturated hydrocarbons using glow discharge plasma ionization source for mass spectrometry Reviewed

Nunome Yoko, Kodama Kenji, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro, Wagatsuma Kazuaki

TALANTA Vol. 204 page： 310 - 319 2019.11

Generation behavior of tar from ABS, PC, and PE during pyrolysis and steam gasification by mass spectrometry Reviewed

Nunome Yoko, Suzuki Toshiya, Nedjalkov Ivan, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro

JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT Vol. 21 ( 6 ) page： 1300 - 1310 2019.11

Characteristics of Biomass Devolatilization and in Situ Char Gasification Tested by the Non-Isothermal Method Reviewed

Zeng Xi, Kahara Kaito, Ueki Yasuaki, Yoshiie Ryo, Xu Guangwen, Naruse Ichiro

ENERGY & FUELS Vol. 33 ( 10 ) page： 9805 - 9817 2019.10

Removal of gaseous elemental mercury by hydrogen chloride non-thermal plasma modified biochar

Luo Jinjing, Jin Mingchang, Ye Lurong, Cao Yinan, Yan Yonggui, Du Rupeng, Yoshiie Ryo, Ueki Yasuaki, Naruse Ichiro, Lin ChinJung, Lee YiYuan

JOURNAL OF HAZARDOUS MATERIALS Vol. 377 page： 132 - 141 2019.9

Development of a Heating Process of a Slag-Tapping Hole by Syngas Burning in a 150 t/d Entrained-Bed Coal Gasifier Reviewed

Ishiga Takuya, Kumagai Takeshi, Utano Masakazu, Yamashita Hiroshi, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro

ENERGY & FUELS Vol. 33 ( 4 ) page： 3557 - 3564 2019.4

A novel CO2-water leaching method for AAEM removal from Zhundong coal Reviewed

Ding Lizhi, Gao Yaxin, Li Xian, Wang Wenhui, Xue Yi, Zhu Xianqing, Xu Kai, Hu Hongyun, Luo Guangqian, Naruse Ichiro, Yao Hong

FUEL Vol. 237 page： 786 - 792 2019.2

Effects of mechanical stresses around single tube on ash shedding in pulverized coal combustor Reviewed

Sato Naoki, Ueno Shun-ichiro, Ohno Emi, Tamura Masato, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro

PROCEEDINGS OF THE COMBUSTION INSTITUTE Vol. 37 ( 3 ) page： 2875 - 2882 2019

Oxygen chemisorption and low-temperature oxidation behaviors of sub-bituminous coal

Yoshiie Ryo, Onda Masaomi, Ueki Yasuaki, Naruse Ichiro

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY Vol. 14 ( 1 ) page： JTST0005 - JTST0005 2019

Language：English Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers and The Heat Transfer Society of Japan

The effective utilization of sub-bituminous coals should be extended as an energy source for power generation because of their low cost and long minable years. However, sub-bituminous coal may undergo spontaneous combustion owing to high reactivity with oxygen in low-temperature air compared with bituminous coal. Therefore, the objective of this study is to elucidate the low-temperature oxidation behaviors of sub-bituminous coal. In particular, transition from oxygen chemisorption to low-temperature oxidation of sub-bituminous coal has been experimentally examined in detail. Isothermal gravimetric analyses are conducted for several bituminous and sub-bituminous coal samples at temperatures varying between 356 K and 476 K in oxygen-enriched air. The chemical compositions of emission gas are continuously monitored under low-temperature oxidation conditions. The changes in the chemical structure of the coals are analyzed using Fourier transform infrared (FTIR) spectrometry. The experimental results show that the mass of all tested coals, including those of bituminous and sub-bituminous coals, increases at temperatures below 426 K as a result of oxygen chemisorption. At 476 K, the mass of sub-bituminous coal increases slightly with low H2 and CO2 emissions at the beginning and subsequently decreases with high CO and CO2 emissions. This mass change indicates that the transition from oxygen chemisorption to low-temperature oxidation occurs during this period. In addition, the FTIR spectra of sub-bituminous coals show the existence of carbonyl groups even in raw coal samples. These carbonyl groups are considered to contribute to the formation of CO2 and H2 from the beginning of reactions, triggering the transition from oxygen chemisorption to low-temperature oxidation.

DOI： 10.1299/jtst.2019jtst0005

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Scopus

CiNii Research

1-5　Adhesion characteristics of Si compounds on the De-NOx catalyst surface

NAKANISHI Kota, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichiro, OKA Takanori, YOSHIDA Takuya, TANAKA Takeharu, AKIYAMA Katsuya

Proceedings of Conference on Coal Science Vol. 56 ( 0 ) page： 10 - 11 2019

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

In coal-fired power generation, De NOx catalysts are known to deteriorate over time, but its mechanism has not been clarified yet. According to the previous research, it has been found that amorphous silica forms a thin layer on the catalyst surface, which composition are much different from those of coal ash. It implies that coal ash itself does not adhere on the surface of the catalyst, but Si compounds in the gas deposits to the catalyst. In order to confirm this consideration, deposition behaviors of vapor Si compounds to the catalyst surface were examined, and its effect on the catalyst performance was investig ated. High volatile siloxane was selected to simulate vapor Si compounds in exhaust gas. Two kinds of experiments are conducted, such as exposure and immersion tests. In the former, test pieces of the catalyst were exposed to siloxane vapor. In the latter, test pieces were immersed in liquid siloxane and calcined afterward. The amount of silica deposition on the surface of the catalyst was analyzed by SEM / EDX. In the catalyst performance evaluation test, dete rioration of the catalyst by silica adhesion wa s confirmed.

DOI： 10.20550/jiesekitanronbun.56.0_10

1-2-1 Control of Ash Deposition in Pulverized Coal fired Boiler

TSUKAHARA Kyohei, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichiro

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 28 ( 0 ) page： 8 - 9 2019

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

Coal combustion process discharges a large amount of ash, compared with petroleum and natural gas combustions. Coal ash particles melt and partially volatilizes at high temperature zones, causing many problems. In this study, ash deposition experiment was carried out, using simulated heat transfer tubes made of thermal spraying material. Coal ash was injected into the furnace via high penetrance at a high temperature. The molten slag formation ratio of their chemical composition in a single coal was estimated by the thermodynamic equilibrium calculation and the change of ash deposition characteristics was quantitatively discussed.

DOI： 10.20550/jietaikaiyoushi.28.0_8

1-14　Co-combustion Behaviors of Woody Biomass with P ulverized C oal

NAGATA Jun, UEKI Yasuaki, YOSIIE Ryo, NARUSE Ichiro, NARUKAWA Kimihito, MORII Kazuhiko

Proceedings of Conference on Coal Science Vol. 56 ( 0 ) page： 28 - 29 2019

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

Currently, the proportion of fossil fuel in the primary energy supply in Japan is very high. So, the use of renewable energy is collecting a lot of attention as an alternative to fossil fuel. Biomass, a type of renewable energy, has the advantage of carbon neutral. On the other hand, Biomass has the disadvantage of low power generation efficiency when using power generation because of the low energy density. From these backgrounds, biomass co-combustion for coal fired power generation has been focused on. In this study, co-combustion experiments of pulverized coal and biomass samples were carried out, in order to investigate the effect of mixture ratios and types of biomass samples on co-combustion behaviors.

DOI： 10.20550/jiesekitanronbun.56.0_28

Examination of the reduced combustion reaction mechanism for NOx concentration prediction in a waste incinerator

Denda T.

12th Asia-Pacific Conference on Combustion, ASPACC 2019 2019

Insight of arsenic transformation behavior during high-arsenic coal combustion

Yang Y.

Proceedings of the Combustion Institute Vol. 37 ( 4 ) page： 4443 - 4450 2019

A deep insight into carbon conversion during Zhundong coal molten salt gasification

Mian Xu, Hongyun Hu, Yuhan Yang, Yongda Huang, Kang Xie, Huan Liu, Xian Li, Hong Yao, Ichiro Naruse

Fuel Vol. 220 page： 890 - 897 2018.5

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

Molten salt gasification is a promising way for collaborative use of solar energy and Zhundong coal, with in situ capture of Cl/S-pollutants as well as alkali metals. The present study provides a deep insight into carbon conversion during molten salt gasification of a typical Zhundong coal in ternary carbonate eutectics (Li2CO3-Na2CO3-K2CO3). The results demonstrated that the molten salt gasification of Zhundong coal underwent a rapid devolatilization of raw coal and then the gasification of char. The interactions between CO2 and volatiles promoted the cracking of macromolecular compounds, increasing the carbon conversion efficiency during the devolatilization process. The gasification of char was mainly determined by the direct reaction with molten salt, which was slightly affected by the CO2 concentration in the carrier gas. The results of char characterization evidenced that the condensation/graphitization of char was stimulated in the molten eutectics. Meanwhile, a large amount of O-containing groups, especially carbonyl groups, were formed in the molten salt treated char with carbonates as oxygen supplier. Under the influence of molten salts, some carbonyl groups would be formed inside the char. However, the decomposition of those carbonyl groups was suppressed by the mass transfer resistance of the released CO and/or CO2. Applying proper feeding mode, such as feeding coal in pulverized form, could enhance the contact of coal, molten salt and CO2, which remarkably promoted the interactions between molten salts and char containing functional groups.

DOI： 10.1016/j.fuel.2017.12.051

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Scopus

Development of soft ionization using direct current pulse glow discharge plasma source in mass spectrometry for volatile organic compounds analysis

Yoko Nunome, Kenji Kodama, Yasuaki Ueki, Ryo Yoshiie, Ichiro Naruse, Kazuaki Wagatsuma

Spectrochimica Acta - Part B Atomic Spectroscopy Vol. 139 page： 44 - 49 2018.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier B.V.

This study describes an ionization source for mass analysis, consisting of glow discharge plasma driven by a pulsed direct-current voltage for soft plasma ionization, to detect toxic volatile organic compounds (VOCs) rapidly and easily. The novelty of this work is that a molecular adduct ion, in which the parent molecule attaches with an NO+ radical, [M + NO]+, can be dominantly detected as a base peak with little or no fragmentation of them in an ambient air plasma at a pressure of several kPa. Use of ambient air as the discharge plasma gas is suitable for practical applications. The higher pressure in an ambient air discharge provided a stable glow discharge plasma, contributing to the soft ionization of organic molecules. Typical mass spectra of VOCs toluene, benzene, o-xylene, chlorobenzene and n-hexane were observed as [M + NO]+ adduct ion whose peaks were detected at m/z 122, 108, 136, 142 and 116, respectively. The NO generation was also confirmed by emission bands of NO γ-system. The ionization reactions were suggested, such that NO+ radical formed in an ambient air discharge could attach with the analyte molecule.

DOI： 10.1016/j.sab.2017.11.002

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Scopus

Combustion behaviors of wasted plastics coated around electric cables in electrically heated drop tube furnaces

Yoko Nunome, Hiroshi Matsumoto, Ivan Nedjalkov, Yasuaki Ueki, Ryo Yoshiie, Ichiro Naruse

Journal of Material Cycles and Waste Management Vol. 20 ( 1 ) page： 543 - 551 2018.1

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

For thermal recycle by wasted plastics coated around electric cables, ignition and combustion experiments of the pulverized samples were carried out, using two types of electrically heated drop tube furnace, in which the particles are pulsatively fed and continuously fed, respectively. The ignition phenomenon was defined as occurrence of luminous emission from a cloud of the particles fed in the former furnace. The wasted plastics coated around the electric cables mainly make of polyethylene with a little amount of carbon particles. The ignition characteristics of the pulverized plastic samples as well as graphite particles as a reference sample were studied, changing the particle diameters and the furnace wall temperatures. In the electrically heated drop tube furnace with the continuous feeding system, the wall temperature and stoichiometric combustion air ratio were varied to elucidate the fundamental combustion characteristics. As a result, the ignition temperature depended on the particle diameter. The plastics with the particle diameter ranged from 150 to 300 µm could ignite at the lowest furnace temperature. From the continuous combustion tests, CO and lower molecule hydrocarbons like CH4, C2H2 and C2H4 were produced in the upper region of furnace. Finally, all of them gradually burned out.

DOI： 10.1007/s10163-017-0618-0

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Scopus

Case study on removal of heavy metals from waste incineration fly ash by acid leaching method

Yoshiie Ryo, Luo Jinjing, Cao Yinan, Sun Shiqiang, Ueki Yasuaki, Naruse Ichiro

廃棄物資源循環学会研究発表会講演集 Vol. 29 ( 0 ) 2018

Publishing type：Research paper (scientific journal) Publisher：一般社団法人廃棄物資源循環学会

Four kinds of fly ash from three municipal solid incinerators in southern China were examined in this study. The characteristics of fly ash were examined and acid leaching treatment was used to remove heavy metals from samples. The toxicity characteristic leaching procedure (TCLP) was executed to assess the effect of acid leaching method to fly ash samples. The experiment results showed that the contents of Cd and Pb in the original fly ash were higher, which classified them into the hazardous waste list. With the treatment of water washing and acid leaching, all fly ash samples removed heavy metals efficiently and the contents of heavy metals in treated fly ash met the admittance criterion of sanitary landfill.

DOI： 10.14912/jsmcwm.29.0_603

No.1-18 Effect of Temperatures on Ash Particles Characteristics during Reaction of Coke

TESHIMA Koki, UEKI Yasuaki, YOSHIIE Ryo, NARUSE Ichiro

Proceedings of Conference on Coal Science Vol. 55 ( 0 ) page： 36 - 37 2018

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

One of the important purposes of the coke in the blast furnace is the spacer to ensure the gas and liquid permeability. In other hands, ash particles in coke became slags inside the furnace and these are one of the causes that significantly worsen the permeability. In this study, combustion and gasification experiments of coke were conducted at each experimental temperature. Ash particles in the coke samples were analyzed by using SEM in order to clarify effect of temperatures on ash particles characteristics during combustion and gasification of coke.

DOI： 10.20550/jiesekitanronbun.55.0_36

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