Faculty Profiles - NARUSE Ichiro

Papers - NARUSE Ichiro

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Na & Ca removal from Zhundong coal by a novel CO2-water leaching method and the ashing behavior of the leached coal

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

FUEL Vol. 210 page： 8 - 14 2017.12

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD

Zhundong coalfield in China is the largest intact coalfield in the world. However, serious fouling and slagging issues occurred when the Zhundong coal combustion, because of its high Na and Ca contents. In this study, a novel CO2-water leaching method was proposed to remove Na and Ca in Zhundong coal. The removal efficiencies of Na and Ca and the ash characteristics of the leached coal were investigated in detail. The results show that the CO2-water leaching can be easily achieved at room temperature under atmospheric pressure. The removal efficiencies of Na and Ca by the CO2-water leaching were significantly higher than those of water leaching. It is attributed to the effective removal of the organic Na and Ca in the coal. In addition, the CaCO3 in the coal was also effectively removed by CO2-water leaching. The volatility of Na from CO2-water leached coal is only 25% of that of raw coal during the combustion at 900 degrees C. The alkali-acid ratio (B/A) of the CO2-water leached coal ash was significantly lower than those of the raw coal and the water leached coal ashes. The fusion temperature of the CO2-water leached coal ash significantly increased, compared with those of the raw coal and the water leached coal ashes. The deformation temperature of the CO2-water leached coal ash was as high as 1202 degrees C, much higher than those of the raw coal and water leached coal ashes, which were 1098 degrees C and 1142 degrees C, respectively. Besides, the agglomeration and sintering phenomena of coal ash was also inhibited significantly by the CO2-water leaching. Therefore, the CO2-water leaching method was found to be an effective and promising method for AAEM removal from Zhundong coal, and can markedly mitigate the fouling and slagging during Zhundong coal combustion.

DOI： 10.1016/j.fuel.2017.08.046

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Interactions between molten salts and ash components during Zhundong coal gasification in eutectic carbonates

Junhao Shen, Hongyun Hu, Mian Xu, Huan Liu, Kai Xu, Xiuju Zhang, Hong Yao, Ichiro Naruse

FUEL Vol. 207 page： 365 - 372 2017.11

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD

Molten salt gasification provides a promising way for the combined usage of solar energy and coal, during which molten salts act as a heat storage and transfer medium. However, the interactions between coal ash components and molten salts might have undesired effects on the molten salt gasification. The present study investigated the distribution of mineral matters in typical Zhundong coals and the fate of coal ashes in the high-temperature Li2CO3-Na2CO3-K2CO3 eutectic system. The results showed that alkali and alkaline earth metals (AAEMs) were widely distributed in Zhundong coals in the forms of NaCl, CaCO3, CaSO4 and organic matter, which were predominantly dissolved in the molten salts. After the dissolution of these AAEMs, the melting temperature and enthalpy of the molten salts were changed, while the viscosity of the mixtures was hardly affected in melting phase. On the other hand, Si/Al-compounds were also of high content in some Zhundong coals, existing as quartz, kaolin and amorphous species. Some of these compounds tended to react with molten salts, by forming Li-silicate or Li/K-aluminosilicates, which were precipitated out of the system. Meanwhile, the suspension of the unreacted Si/Al-compounds increased the viscosity of molten salts. Additionally, interactions between coal ashes and molten salts brought about the decrease in thermal diffusivity and thermal conductivity of the eutectic system as well as the increase in specific heat capacity. (C) 2017 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.fuel.2017.06.079

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Effect of hydrogen gas addition on combustion characteristics of pulverized coal

Yasuaki Ueki, Ryo Yoshiie, Ichiro Naruse, Shinroku Matsuzaki

FUEL PROCESSING TECHNOLOGY Vol. 161 page： 289 - 294 2017.6

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

A promising approach to decrease CO2 emissions from blast furnaces during ironmaking is to blow a reducing gas containing hydrogen into blast furnaces from their tuyeres. However, the combustion behavior of pulverized coal in the presence of a hydrogen-containing gas has not been elucidated. In this work, the combustion experiments of pulverized coal using a drop tube fumace were carried out to investigate the effect of H-2 gas addition on the combustibility of pulverized coal. The combustion ratio of char particles in the presence of H-2 gas (when introduced at a flow rate of 0.10 L/min) was larger than that in the absence of H-2 gas. This is because of the enhanced release of volatile matter from coal and the combustion of char due to an increase in the temperature of the coal particles, which was caused by the drastic combustion of H-2 gas. The combustion ratio of char particles when H-2 gas was added at flow rates higher than 0.21 L/min was considerably smaller than that obtained when H-2 gas was not added. It was found that the combustibility of coal was enhanced when an optimum H-2 gas flow rate was used. (C) 2017 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.fuproc.2017.02.034

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Investigation of fragmentation and coalescence behavior of ash particles in simulated coal combustion

Ryo Yoshiie, Hitoshi Nishimura, Yasuaki Ueki, Ichiro Naruse, Naoki Sato, Takamasa Ito, Wonyoung Choi, Shunichiro Ueno

FUEL PROCESSING TECHNOLOGY Vol. 161 page： 101 - 106 2017.6

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

In order to predict ash deposition in a pulverized coal combustion process, the fragmentation, detachment, and coalescence behavior of ash particles in coal were quantitatively evaluated to distinguish between excluded and included minerals. The experiments for simulated EM heating and simulated coal combustion were carried out in a drop tube furnace. Change in the numbers of EM and IM particles were measured at different residence times by scanning a sampling probe along the flow direction in the reactor tube. The rate constants of EM fragmentation were estimated from the simulated EM heating experiment. The solution to a system of differential equations that includes the effects of fragmentation, detachment, and coalescence as functions for the numbers of EM and IM was obtained as a kinetic model. These functions were fitted to the experimental results for simulated coal combustion experiment to obtain the rate constants for detachment and coalescence. This method was also applied to previous experimental results using three actual coal samples. The rate constants of detachment and coalescence were mainly affected by char structure during coal combustion. (C) 2017 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.fuproc.2017.02.033

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Fundamental Combustion Behaviors of Solid Industrial Wastes

Asai Toshihiko, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro, Terasaki Junichi, Ueno Naoki

JOURNAL OF THE JAPAN INSTITUTE OF ENERGY Vol. 96 ( 6 ) page： 167-175 2017.6

Fundamental Combustion Behaviors of Solid Industrial Wastes

Asai Toshihiko, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro, Terasaki Junichi, Ueno Naoki

JOURNAL OF THE JAPAN INSTITUTE OF ENERGY Vol. 96 ( 6 ) page： 167-175 2017.6

Energy system simulation of regenerable Molten Alkali Carbonates for gasification of carbonaceous resources

Raharjo S.

ARPN Journal of Engineering and Applied Sciences Vol. 12 ( 7 ) page： 2306 - 2312 2017.4

Tar and soot generation behaviors from ABS, PC and PE pyrolysis

Ivan Nedjalkov, Ryo Yoshiie, Yasuaki Ueki, Ichiro Naruse

JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT Vol. 19 ( 2 ) page： 682 - 693 2017.4

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

In this study we performed a non-isothermal thermogravimetric analysis on three thermoplastics-ABS, PC and PE. The Coats and Redfern method (Nature 201: 68-69, 1964) was then used to approximate the kinetic parameters of each material. In addition, we performed a series of pyrolysis experiments in a batch reactor, for each plastic. The experiments were performed over the temperature range of 600-1000 degrees C at a constant residence time. The liquid and solid products of the pyrolysis, were collected, separated and weighted. Those products were categorized as soot, tar and char (PC only), and their relative weight to initial sample weight (DAF) was plotted against the temperature. The tar measured was exclusively medium to high molecular weight (>80 g/mol). Results revealed that relative tar and soot production, for all three materials, first increases and then decreases with temperature increase. The maximum achieved tar yields for ABS, PC and PE were at 700, 650 and 800 degrees C, respectively; and the maximum soot yields were at 1000, 1000, 950 degrees C, respectively.

DOI： 10.1007/s10163-016-0470-7

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1-4-1 Effect of coal types on low-temperature oxidation behaviors of coal

YOSHIIE Ryo, ONDA Masaomi, UEKI Yasuaki, NARUSE Ichoro

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 26 ( 0 ) page： 24 - 25 2017

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

Consumption of subbituminous coal will be expanded due to its low cost and long minable years around the world. However, a control of spontaneous firing at the stock yard is one of outstanding issues for the utilization of subbituminous coal. Therefore, an objective of this study is the elucidation of low-temperature oxidation behaviors of subbituminous coals. Several subbituminous and bituminous coals were selected as experimental samples for low-temperature oxidation. Mass changes of coal samples were measured by thermos-balance at the temperature between 356K and 476K in 50%N2-50%O2 atmosphere. Differences of molecular structures of coals between before and after low-temperature oxidation were analyzed by FTIR As a result, the aliphatic carbon in the coal was confirmed to react with oxygen, forming carbonyl group.

DOI： 10.20550/jietaikaiyoushi.26.0_24

5-2-1 Combustion Behaviors of Solid Combustible Wastes under Isothermal Conditions

UEKI Yasuaki, ASAI Toshihiko, YOSHIIE Ryo, NARUSE Ichiro, TERASAKI Junichi, UENO Naoki

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 26 ( 0 ) page： 186 - 187 2017

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

To elucidate fundamental combustion behaviors of some solid combustible wastes under isothermal conditions, the isothermal combustion experiments are carried out, using an electrically heated vertical batch furnace. The effects of the furnace temperature and the oxygen partial pressure in the reaction atmosphere on the combustion behaviors are studied experimentally and kinetically. As a result, the completion period of the overall combustion decreases with increases of both the furnace temperature and the oxygen partial pressure.

DOI： 10.20550/jietaikaiyoushi.26.0_186

No.1-1 Elucidation of distribution behaviors of trace elements during coal gasification process

ATSUMI Shota, UEKI Yasuaki, YOSHIIE Ryo, NARUSE Ichiro

Proceedings of Conference on Coal Science Vol. 54 ( 0 ) page： 2 - 3 2017

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

In this study, we conducted coal gasification experiments by electrical drop tube furnace. In the experiments, we used Low Pressure Impactor (LPI) for the particle sampling in different particle size. Captured particles are dissolved in the acid on each particle size and the trace element concentrations of the solutions in the particles are analyzed by ICP-AES. For the consideration of the result of the experiments, we conducted thermodynamic equilibrium calculations. Calculation results support to investigate the chemical compounds of trace elements in the gasification atmosphere.

DOI： 10.20550/jiesekitanronbun.54.0_2

CO2 Regeneration of Used Alkali Carbonates for High-Temperature Desulfurization in Gasification

Raharjo Slamet, Nedjalkov Ivan, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro

ENERGY & FUELS Vol. 30 ( 10 ) page： 8556 - 8560 2016.10

Effects of Coal Type on Growth and Shedding of Ash Deposit in Pulverized Coal Combustors

Sato Naoki, Ueno Shunichiro, Priyanto Dedy E., Ohno Emi, Matsuzawa Yoshiaki, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro

ENERGY & FUELS Vol. 30 ( 7 ) page： 6059 - 6069 2016.7

Capture of Gaseous Mercury by Waste-Derived Particles as Sorbents

Yoshiie Ryo, Ueki Yasuaki, Naruse Ichiro

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN Vol. 49 ( 3 ) page： 312 - 316 2016.3

Publishing type：Research paper (scientific journal) Publisher：公益社団法人化学工学会

Flue gases contain elemental mercury formed by combustion/incineration processes, and it is difficult to remove them by conventional gas cleaning devices. Researchers have developed a few sorbent materials to capture gaseous elemental mercury. Our study also found two candidate sorbent materials using low-cost waste derived particles, a paper sludge incineration ash and a carbonized municipal solid waste char. The main objective of this study is to elucidate the capturing mechanisms of gaseous elemental mercury in these two sorbents. In order to analyze the chemical states of the mercury adsorbed on the sorbents, X-ray absorption near edge structure (XANES) analyses of the mercury captured by sorbents are conducted. The XANES spectra of the two sorbents were found to be similar to those of Hg2Cl2 and HgS standard chemicals, while the XANES spectrum of the commercialized activated carbon for mercury capture was similar to that of elemental mercury. These results suggest that the gaseous mercury is captured and fixed on the sorbents via oxidation by chlorine and sulfur present in the sorbents.

DOI： 10.1252/jcej.14we339

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Gasification Characteristics of Woody Biomass with Mixture Gas of CO2 with H2O

Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN Vol. 49 ( 3 ) page： 287 - 293 2016.3

Publishing type：Research paper (scientific journal) Publisher：公益社団法人化学工学会

The objectives in the present study are to elucidate the fundamental gasification characteristics of woody biomass with a mixture gas of CO2 and H2O. The effects of temperature and gasification agents on the gasification characteristics of woody biomass were experimentally studied using an electrically heated drop tube furnace. The co-gasification performance of CO2 with H2O was compared with the CO2 or H2O gasification performance alone. As a result, H2 and CO concentrations increased with an increase of temperature under both the co- and single-gasification conditions. CO under the co-gasification condition was produced more than under the single-gasification condition. The H2 formation showed the opposite tendency to the CO formation during the co-gasification. This synergistic effect is caused by the difference of the surface structure of the woody biomass particles by CO2 from H2O.

DOI： 10.1252/jcej.14we338

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Preface to the Special Issue for Energy Engineering

Naruse Ichiro, Ohtomo Junichiro, Qian Eika W., Yoshiie Ryo

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN Vol. 49 ( 3 ) page： 235 - 235 2016.3

Development of thermal spraying materials through several corrosion tests for heat exchanger tube of incinerators Reviewed

Juan Chen, Yoshihiko Ninomiya, Hiroshi Naganuma, Yoriaki Sasaki, Manabu Noguchi, Hiromitsu Cho, Yasuaki Ueki, Ryo Yoshiie, Ichiro Naruse

Fuel Processing Technology Vol. 141 ( 2 ) page： 216-224 2016.1

Development of thermal spraying materials through several corrosion tests for heat exchanger tube of incinerators Reviewed

Juan Chen, Yoshihiko Ninomiya, Hiroshi Naganuma, Yoriaki Sasaki, Manabu Noguchi, Hiromitsu Cho, Yasuaki Ueki, Ryo Yoshiie, Ichiro Naruse

Fuel Processing Technology Vol. 141 ( 2 ) page： 216-224 2016.1

Development of thermal spraying materials through several corrosion tests for heat exchanger tube of incinerators

Chen Juan, Ninomiya Yoshihiko, Naganuma Hiroshi, Sasaki Yoriaki, Noguchi Manabu, Cho Hiromitsu, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro

FUEL PROCESSING TECHNOLOGY Vol. 141 page： 216 - 224 2016.1

Performance indicators for air and air-steam auto-thermal updraft gasification of biomass in packed bed reactor Reviewed

Joseph H. Kihedu, Ryo Yoshiie, Ichiro Naruse

FUEL PROCESSING TECHNOLOGY Vol. 141 page： 93 - 98 2016.1

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Auto-thermal updraft gasification of biomass pellets in a packed bed reactor was conducted by using air and air-steam mixture. Air-steam gasification produced syngas with slightly improved lower heating value of 4.5 MJ/m(N)(3), in comparison to 4.4 MJ/M-N(3) produced during air gasification. The corresponding tar generation for air gasification and air-steam gasification was 212 g/m(N)(3) and 26.2 g/m(N)(3), respectively. Cold gas efficiency for air gasification and air-steam gasification was realized to be 91% and 91.4%, respectively. Carbon conversion during air-steam gasification reached about 91.5% while carbon conversion during air gasification was limited to 84.3%. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.fuproc.2015.07.015

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Papers - NARUSE Ichiro