Papers - NARUSE Ichiro

Pyrolysis and steam gasification properties of mangroves

Sakurai Y., Kobayashi J., Sakai Y., Naruse I.

Chemosphere   Vol. 345   page： 140388   2023.12

　More details

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

The rising atmospheric CO2 emissions from the burning of fossil fuels remains a global concern. Mangrove forests, which are important for global biodiversity, are known for their high carbon fixation capacity. However, the characteristics of the pyrolysis and gasification of mangroves remain unclear. Thus, this study focused on mangroves' basic pyrolysis and steam gasification properties for use as a gasification fuel. Three mangrove species: Rhizophora mucronata, Bruguiera cylindrica, and Avicennia marina, were used as experimental samples. In addition, three species of land wood were used for comparison: Eucalyptus, Japanese cedar, and Japanese cypress. In addition to the raw sample, a demineralized sample was used for each sample to account for the influence of the alkali and alkaline earth metals (AAEMs) on pyrolysis and steam gasification. Thermogravimetric analysis was performed to obtain thermogravimetric curves of mangroves and land wood. A laboratory-scale instrument for pyrolysis and gasification using a batch-type horizontal electric furnace was also used at 800 °C in an inert and steam atmosphere. The char yield of raw mangroves was high and independent of the Klason lignin content, suggesting that AAEMs influence char formation during the initial pyrolysis of the mangroves. The results of pyrolysis and gasification under steam atmosphere showed that the H2 production ratio (Steam/Inert) from mangroves was 2.52–5.33, compared to 1.76–2.35 for land woods, the addition of steam significantly enhanced the steam gasification of mangroves. Mangroves contain relatively large amounts of AAEMs, which indicates their potential as a gasification feedstock.

DOI： 10.1016/j.chemosphere.2023.140388

Scopus

PubMed

O-11　Effect of char particle size on gasification behavior of biomass char

SHIGEYOSHI Seinosuke, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichiro, NAKAJIMA Mitsuyuki, ENDO Yoshihiro, YANAGAWA Tetsu

Proceedings of the Conference on Biomass Science   Vol. 19 ( 0 ) page： 25 - 26   2023.11

　More details

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

<p>Currently, carbon-neutral biomass fuels are attracting attention as an alternative fuel to fossil fuels from the perspective of combating global warming and realizing a sustainable society. However, biomass fuels have the problems of low energy density and high transportation costs. Therefore, we focused on biomass gasification technology. In this study, H₂O gasification experiments were conducted with four different grain size samples using an electrically heated vertical batch furnace to investigate the effect of char grain size on the H₂O gasification behavior of woody biomass char. As a result, there was almost no effect of char particle size on the reaction rate because the reaction proceeds by diffusion of the gasifier into the porous structure of the wood.</p>

DOI： 10.20550/jiebiomassronbun.19.0_25

CiNii Research

O-16　CO₂ concentration dependence of CO₂ gasification behavior of woody biomass

ITO Norihiro, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichiro

Proceedings of the Conference on Biomass Science   Vol. 19 ( 0 ) page： 35 - 36   2023.11

　More details

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

<p>In recent years, the primary energy consumption has been incresing globally. Demands for biomass fuels, which are carbon neutral, have been becoming larger. However, biomass fuels have problems such as low energy density and low transportation efficiency. To solve them, biomass gasification has gained broad attention. In this study, we investigated the effect of CO₂ as an oxidant in the gasification reaction of woody biomass. CO₂ gasification experiments were conducted under three conditions with different CO₂ concentrations using an electrically heated drop tube furnace, and the produced gas was analyzed for chemical compositions. As a result, it was found that CO production increased with increase in CO₂ concentration under the experimental conditions while H₂ production decreased.</p>

DOI： 10.20550/jiebiomassronbun.19.0_35

CiNii Research

1-01　Effect of temperature on degradation behavior during gasification reaction of coke

ZHENG Zhenjie, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichiro

Proceedings of Conference on Coal Science   Vol. 60 ( 0 ) page： 2 - 3   2023.10

　More details

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

<p>As the hydrogen enrichment operation is being considered in the blast furnace to reduce the CO₂ emissions. Since the ash behavior of coke is one of the factors that deteriorate the permeability and stability in the blast furnace, it is important to understand the degradation behavior of coke during the H₂O gasification process. In this study, in order to find the effect of temperature on degradation behavior between CO₂ gasification and H₂O gasification, gasification experiments were conducted in CO₂ and H₂O atmospheres at different temperatures in 20% reaction ratio. Moreover, to investigate the pore behavior, we used the SEM to observe the cross-section of cokes.</p>

DOI： 10.20550/jiesekitanronbun.60.0_2

CiNii Research

2-17　Kinetic evaluation of high temperature corrosion in Waste-to-Energy conditions

NAGANUMA Hiroshi, GOTO Taeko, SAWADA Akihiro, MORI Takehito, WATANABE Sho, NARUSE Ichiro, YOSHIIE Ryo, UEKI Yasuaki

Proceedings of Conference on Coal Science   Vol. 60 ( 0 ) page： 58 - 59   2023.10

　More details

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

<p>Some ash particles in municipal and industrial waste adhere to heat exchanger tube surfaces, which causes problems such as heat-transfer inhibition, high temperature corrosion and low utilization in Waste-to-Energy (WtE) plants. The objective of this study is to develop new surface treatment materials and techniques which can decrease the ash deposition and the corrosion. In this paper, mechanisms of NaCl-induced accelerated oxidation were evaluated through TG-DTA, hightemperature corrosion test, and understanding of reaction kinetics.</p>

DOI： 10.20550/jiesekitanronbun.60.0_58

CiNii Research

2-16　Kinetic analysis of high temperature accelerated oxidation in NaCl

SAWADA Akihiro, NAGANUMA Hiroshi, GOTO Taeko, MORI Takehito, WATANABE Sho, NARUSE Ichiro, YOSHIIE Ryo, UEKI Yasuaki

Proceedings of Conference on Coal Science   Vol. 60 ( 0 ) page： 56 - 57   2023.10

　More details

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

<p>In woody biomass or waste to energy plants, high temperature corrosion of boiler tubes, such as active oxidation which is caused by alkali chlorides has become a serious problem. In this study, the active oxidation of metal specimens in the presence of NaCl was evaluated with Thermogravimetry - Differential Thermal Analysis (TG-DTA) to elucidate the mechanisms and establish the highly practical solutions for the corrosion. As a result, the active oxidation had a dependency of the metal composition, and there was a correlation between increments of metal specimens with TG isothermal tests and decrements with immersion corrosion tests.</p>

DOI： 10.20550/jiesekitanronbun.60.0_56

CiNii Research

1-04　Formation behavior of silica particles from biomass in the combustion field

SUEZAWA Ryo, YOSHIIE Ryo, NARUSE Ichiro, UEKI Yasuaki, Takanori OKA

Proceedings of Conference on Coal Science   Vol. 60 ( 0 ) page： 8 - 9   2023.10

　More details

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

<p>In recent large-scale pulverized coal-fired power plants, the co-firing of biomass fuels is being promoted to reduce carbon dioxide emissions per unit of power generation. One of the issues related to the biomass co-firing is the deposition and agglomeration of trace components in the boiler. In this study, we focused on silicon compounds as trace components that affect the combustion process. Silicon compounds are simultaneously combusted with biomass fuels, leading to the formation of silica particles, which can adhere to combustion boilers and cause performance deterioration, as well as contribute to atmospheric pollution as particles smaller than PM2.5. Therefore, countermeasures are necessary. The aim of this study is to investigate the combustion characteristics of organic silicon compounds and the behavior of silica particle formation within a pulverized coal combustion boiler. Siloxane, which is might be considered as one of the trace components in biomass, is used as a substitute for silicon compounds, and combustion experiments are conducted using a Drop Tube Furnace (DTF). The analysis of the generated particles provides insights into the formation behavior of silica particles under combustion conditions. When siloxane was combusted using the DTF (Drop Tube Furnace) apparatus, it resulted in the formation of primary particles consisting of white silica particles with amorphous structures at the nanoscale or below.</p>

DOI： 10.20550/jiesekitanronbun.60.0_8

CiNii Research

3-2-1　Formation behaviors of tar and soot in CO₂ gasification of woody biomass

OKADA Takumi, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichiro

Proceedings of the Annual Conference of The Japan Institute of Energy   Vol. 32 ( 0 ) page： 40 - 41   2023.8

　More details

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

<p>Recently, the gasification process of woody biomass has been attracting attention to produce renewable gas fuels. However, the gasification process emits tar and soot, which can cause equipment troubles. Therefore, it is necessary to control the formation of tar and soot, and then it is important to elucidate their formation behaviors. This study compared pyrolysis and CO₂ gasification experiments at 950°C and 1100°C, simulating CO₂ gasification by exhaust gas recirculation. Experimental results showed that the addition of CO₂ increased soot formation at 1100°C. It was also observed that H₂ decreases under the same conditions due to the reverse water-gas shift reaction. One of the reasons for the increase in soot formation is that the decrease in H₂ promotes the condensation polymerization of hydrocarbons.</p>

DOI： 10.20550/jietaikaiyoushi.32.0_40

CiNii Research

5-2-3　Control of ash adhesion in municipal waste treatment furnaces

AWATA Yosuke, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichiro

Proceedings of the Annual Conference of The Japan Institute of Energy   Vol. 32 ( 0 ) page： 114 - 115   2023.8

　More details

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

<p>Ash adhesion to the surface of heat-transfer tubes such as slugging and fouling that occurs in waste incinerators and boilers causes problems such as corrosion of heat-transfer tubes, reduction of power generation efficiency, and impediment to safe operation of incinerators. In this study, we investigated a heat-transfer tube material with excellent corrosion resistance and ash adhesion resistance to solve these problems. Specifically, we compared the molten salt formation ratio due to the difference in heat-transfer tube materials by using thermodynamic equilibrium calculation and conducted ash adhesion experiments by using drop tube furnace.</p>

DOI： 10.20550/jietaikaiyoushi.32.0_114

CiNii Research

Defossilization and decarbonization of hydrogen production using plastic waste: Temperature and feedstock effects during thermolysis stage Reviewed

Andrei Veksha, Yuxin Wang, Jun Wei Foo, Ichiro Naruse Grzegorz Lisak

Journal of Hazardous Materials   Vol. 452 ( 131270 )   2023.6

Effect of temperature on behavior and mechanism of biochar gasification in the mixed CO2 and H2O atmosphere Reviewed

Yuxin Wang, Ryo Yoshiie, Yasuaki Ueki, Ichiro Naruse

Journal of the Energy Institute   Vol. 108 ( 101238 )   2023.6

Characteristics of biomass gasification by oxygen-enriched air in small-scale auto-thermal packed-bed gasifier for regional distribution Reviewed

Yuxin Wang, Ryo Yoshiie, Yasuaki Ueki, Ichiro Naruse

Fuel   Vol. 342 ( 127852 )   2023.2

　More details

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

<p>This study focuses on the operation of Ni-YSZ-based SOFC fueled with artificial fuel gas simulating syngas from biomass gasification. H₂, CO, CO₂ and H₂O were mixed to make up artificial fuel gas with various compositions. Electrochemical behaviors were investigated under constant current conditions at 1073K during 8h using Galvano-stat. Cyclic voltammetry was also conducted to assess the stability of SOFC. Measurement results showed that CO₂ and H₂O have significant impacts on power generation performance. In particular, the performance degradation was significant in the absence of CO₂.</p>

Energy recovery with non-fossil fuels in metal recycling furnace

Watanabe Hiromitsu, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro, Oshima Yusuke, Nakagawara Satoshi

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management   Vol. 34 ( 0 ) page： 295   2023

　More details

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

<p>The non-ferrous smelting industry is accelerating its efforts to expand the processing of recycled materials in order to achieve carbon neutrality, but Top Submerged Lance (TSL) furnace, which play an important role as metal recycling furnace, consume large amounts of coal, which has high CO₂ emissions per unit of heat. The study examined waste circuit boards, waste plastics, waste tyres and biomass fuels as candidates for alternative fuels, and confirmed whether torrefaction of biomass fuels with low calorific value could produce the same calorific value as the fuel used, fuel coal. Sample properties and calorific value after torrefaction of six biomass fuels were compared with fuel coals, showed that all samples had a higher volatile content and a lower fixed carbon content than fuel coal, but the ash content differed from sample to sample. In addition, the torrefaction of both samples significantly increased the calorific value.</p>

DOI： 10.14912/jsmcwm.34.0_295

CiNii Research

Degradation Behaviors of Coke in CO₂ and H₂O Gasification Reactions at Low Temperatures Open Access

Zheng Zhenjie, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro

ISIJ International   Vol. 63 ( 11 ) page： 1810 - 1816   2023

　More details

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

<p>This study aims to investigate the degradation behavior of coke during CO₂ and H₂O gasification reactions. Gasification experiments were conducted in CO₂ and H₂O atmospheres at 1000°C using cokes with different coke reaction indices (CRIs) at 20% reaction ratio. After gasification, the shrinkage ratio in CO₂ gasification was higher than that in H₂O gasification. Moreover, the shrinkage ratio increased with increasing CRI, indicating that the ratio of the surface reaction became larger than that of the internal reaction with increasing CRI at same reaction ratio. The increase value in porosity by gasification reaction decreased with increasing CRI. Owing to the faster diffusion rate of water vapor at 1000°C, water vapor diffuses into the inner part of coke faster, whereas CO₂ gasification reacted from the outer to the inner slowly. Therefore, the increase in porosity of the inner part of coke by H₂O gasification is larger than that by CO₂ gasification. In addition, the degradation behavior in same coke by CO₂ or H₂O gasification did not have obviously difference at same reaction ratio in 1000°C.</p>

DOI： 10.2355/isijinternational.ISIJINT-2023-207

Open Access

Web of Science

Scopus

CiNii Research

Ash adhesion control technology for energy recovery of industrial waste

Mukomoto Shun, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro, Nagatsu Nobuharu

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management   Vol. 34 ( 0 ) page： 435   2023

　More details

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

<p>Ash adhesion on the surface of heat transfer tubes in incinerators and boilers that use waste-derived fuels causes problems such as reduced power generation performance due to heat transfer inhibition, incinerator operation inhibition, and inhibition of high temperature and high pressure boiler steam generation. In this study, we investigated thermal spraying materials for heat transfer tube surfaces that can reduce ash adhesion. The molten salt formation rate, which is related to the ash adhesion phenomenon, was compared and evaluated for each material using thermodynamic equilibrium calculations, and contact angle measurement experiments were conducted using each material to investigate the ash adhesion resistance of the thermal spraying materials from both computational and experimental aspects. The developed material Ni-2 was found to have significantly lower molten salt formation than the other two materials, and is expected to be an excellent material against high-temperature corrosion. The contact angle of Ni-2 was higher than that of the other substrate, indicating that Ni-2 can inhibit and reduce ash adhesion.</p>

DOI： 10.14912/jsmcwm.34.0_435

CiNii Research

Reduction of Nitrogen Oxides by Calcium Ferrites in an Iron Ore Sintering Plant Open Access

Katayama Kazuaki, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro, Nagata Junji, Higuchi Kenichi

ISIJ International   Vol. 63 ( 10 ) page： 1647 - 1657   2023

　More details

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

<p>In iron ore sintering plants, the emissions of nitrogen oxides (NO_x) must be reduced. Previous studies have shown that calcium ferrites could significantly reduce NO_x emissions. However, the reaction paths between calcium ferrites and NOx have not been clarified yet. In this study, NO_x reduction tests were conducted at 1073 K–1373 K with a CO/CO₂ ratio of 0.03–0.10. Accordingly, the phase compositions of calcium ferrites before and after NO_x reduction were investigated. CaO·FeO·Fe₂O₃ (CWF), which had a significant effect on NO_x reduction, was formed with a CO/CO₂ ratio of 0.03–0.10. Based on the phase compositions of the calcium ferrites before and after NO_x reduction, we determined that the CWF reduced the amounts of NO_x, and CaO·Fe₂O₃ (CF), 2CaO·Fe₂O₃ (C2F), and Fe₃O₄ are produced from the CWF. The NO_x reduction behavior during coke combustion tests was also investigated. By coating a mixture of iron ore and quicklime around the coke, NOx formation was decreased during coke combustion. This phenomenon may have been caused by the formation of reduced calcium ferrites from a mixture of iron ore and quicklime on the coke surface.</p>

DOI： 10.2355/isijinternational.ISIJINT-2023-210

Open Access

Web of Science

Scopus

CiNii Research

1-03　Ash Particles Behaviors during Gasification Reaction of Coke

ZHENG Zhenjie, UEKI Yasuaki, YOSHIIE Ryo, NARUSE Ichiro

Proceedings of Conference on Coal Science   Vol. 59 ( 0 ) page： 6 - 7   2022.10

　More details

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

<p>In a blast furnace, coke plays various roles such as supplying a heat source and generating reducing gases such as CO through a gasification reaction. However, with the global warming progresses, it is becoming necessary to reduce CO₂ emissions. To reduce CO₂ emissions, Hydrogen-enriched blast furnace operation is being considered. In this study, in order to find the difference between CO₂ gasification and H₂O gasification, we used the SEM to observe the cross-section of cokes.</p>

DOI： 10.20550/jiesekitanronbun.59.0_6

CiNii Research

2-28　Mechanisms of ash deposition and high-temperature corrosion in Waste to Energy plants

NAGANUMA Hiroshi, GOTO Taeko, SAWADA Akihiro, MORI Takehito, WATANABE Sho, NARUSE Ichiro, YOSHIIE Ryo, UEKI Yasuaki

Proceedings of Conference on Coal Science   Vol. 59 ( 0 ) page： 84 - 85   2022.10

　More details

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

<p>Some ash particles in municipal and industrial waste adhere to heat exchanger tube surfaces, which causes problems such as heat-transfer inhibition, high temperature corrosion and low utilization in Waste-to-Energy (WtE) plants. The objective of this study is to develop new surface treatment materials and techniques which can decrease the ash deposition and the corrosion. In particular, mass loss with high-temperature corrosion test and ash adhesion force were measured to provide further understanding of ash deposition mechanisms for various metal surfaces in WtE plants.</p>

DOI： 10.20550/jiesekitanronbun.59.0_84

CiNii Research

2-27　Kinetic analysis of active oxidation in chloride environment

SAWADA Akihiro, NAGANUMA Hiroshi, GOTO Taeko, MORI Takehito, WATANABE Sho, NARUSE Ichiro, YOSHIIE Ryo, UEKI Yasuaki

Proceedings of Conference on Coal Science   Vol. 59 ( 0 ) page： 82 - 83   2022.10

　More details

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

<p>In woody biomass or waste to energy plants, high temperature corrosion of boiler tubes, such as active oxidation which is caused by alkali chlorides has become a serious problem. In this study, the active oxidation of metal specimens in a chloride environment was evaluated with Thermogravimetry - Differential Thermal Analysis (TG-DTA) to elucidate the mechanisms and establish the highly practical solutions for the corrosion. As a result, the active oxidation had a dependency of the metal composition, and there was a correlation between increments of metal specimens with TG isothermal tests and decrements with immersion corrosion tests.</p>

DOI： 10.20550/jiesekitanronbun.59.0_82

CiNii Research

Ash deposition mechanisms in Waste-to-Energy plants Reviewed

Hiroshi NAGANUMA, Takehito MORI, Sho WATANABE, Akihiro SAWADA, Taeko GOTO, Yasuaki UEKI, Ryo YOSHIIE, Ichiro NARUSE

Mechanical Engineering Journal   Vol. 9 ( 4 ) page： 21   2022.6