研究者詳細 - 成瀬　一郎

論文 - 成瀬　一郎

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Effects of inherent ash particles on the powdered biochar structure evolution in H2O and CO2 gasification

Wang, YX; Uemoto, M; Ueki, Y; Yoshiie, R; Naruse, I

JOURNAL OF THE ENERGY INSTITUTE 119 巻 2025年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of the Energy Institute

As the use of powdered feedstocks in efficient combustion/gasification processes increases, the impact of inherent ash becomes more significant. This study investigates the effects of inherent ash particles, with their catalytic actions, on the external and internal structural evolution of powdered biochar during H2O and CO2 gasification. The external structure, including char surface morphology and ash particle distribution on the surface, was analyzed using SEM-EDX and binarization. Three catalytic kinetic models—the catalytic volume reaction model (CVRM), catalytic shrinking core model (CSCM), and catalytic random pore model (CRPM)—were applied to evaluate internal structure evolution. The results show that char fragments from H2O gasification exhibit a pronounced pore structure with an eroded and fractured carbon matrix. Ash particles are compact and spherical, embedded in surface grooves and eroded pore edges. Model fitting suggests that the internal structure evolution follows the pattern described by CRPM. These findings suggest that H2O molecules penetrate the pores, promote fragmentation, and expose more active surface area and catalytic ash particles, thereby accelerating the reaction rate. In contrast, char fragments from CO2 gasification show smooth surfaces and regular edges, with ash particles loosely adhering to the pores and exhibiting minimal catalytic activity. The internal structure evolution in CO2 gasification is well described by the CSCM. These external and internal structure evolutions indicate that the char-CO2 reaction mainly occurs on the char surface, with ash particles gradually exposed but lacking significant catalytic effect. Based on these findings, two distinct char physical structure evolution forms under the influence of inherent ash particles were proposed for H2O and CO2 gasification.

DOI： 10.1016/j.joei.2024.101941

Web of Science

Scopus

The role of post-pyrolysis carbon dioxide capture in hydrogen recovery from waste-derived pyrolysis gas

Wang, YX; Veksha, A; Ong, J; Ueki, Y; Yoshiie, R; Naruse, I; Lisak, G

FUEL 381 巻 2025年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Fuel

The study elucidated the role of post-pyrolysis CO2 removal using a CaO sorbent on upgrading pyrolysis gas into H2-rich gas. The pyrolysis gas was obtained from various waste-derived feedstocks (municipal sewage sludge, refused derived fuel (RDF), pine sawdust (biomass), and marine litter) by pyrolysis (600 °C), and underwent the treatment with CaO (600 °C) followed by the thermolytic decomposition at 1300 °C. The results show that CaO utilization does not change significantly H2 yield and higher heating value of gas on a feedstock mass basis but increases H2 purity from 49.6–83.3 to 63.7–94.4 vol% and H2/CO ratio from 1.1–5.7 to 1.9–19.8 of the product gas across all feedstocks. Normalized rate constants K for CO2 capture by CaO, determined by the grain model, varied between 0.0001 and 0.0006 min−1, revealing the feedstock-specific effectiveness of CaO. The higher CaO consumption rates were observed in case of RDF and biomass compared to sludge and marine litter. This could be attributed to the coking and faster carbonation of CaO caused by the composition of pyrolytic products. The obtained results emphasize the potential of integrating CaO sorbent into pyrolysis-based processes for the production of decarbonized H2-rich gas with higher purity. Moreover, the use of normalized kinetic parameters provides a straightforward method for the selection of feedstocks suitable for decarbonization of pyrolysis gas using CaO sorbent. The predominant factor affecting the carbonation kinetics of the CaO sorbent was found to be the CO2 flow rates in their respective pyrolysis gases.

DOI： 10.1016/j.fuel.2024.133293

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Scopus

Effect of temperature on reaction and degradation behaviors during CO2 and H2O gasification reactions of coke in same conversion ratio

Zheng Zhenjie, Ueki Yasuaki, Naruse Ichiro

ISIJ International advpub 巻 ( 0 ) 2025年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：The Iron and Steel Institute of Japan

The efficiency of blast furnaces is adversely affected by coke degradation via gasification. Considering the utilization of hydrogen-enriched blast furnaces, it is essential to investigate the reaction and degradation behaviors of coke at different temperatures. In this study, coke gasification experiments were conducted under CO2 and H2O atmospheres at different temperatures to prepare cokes with a conversion ratio of 0.2. The reaction rate of the H2O gasification reaction was higher than that of the CO2 gasification reaction at the same temperature. The activation energies for CO2 and H2O gasification were 150.2 and 126.0 kJ/mol, respectively. After gasification, the shrinkage ratio was low by H2O gasification at 1273 K and increased with increasing temperature, indicating that the surface reaction became the control factor that consumed the coke matrix with increasing temperature. On the other hand, the shrinkage ratio by CO2 gasification tended to be stable from 1273 to 1673 K. Furthermore, the increase in the porosity of coke by H2O gasification was lower than that by CO2 gasification at higher temperatures. In addition, the strength of the coke via H2O gasification was higher than that of the coke via CO2 gasification.

DOI： 10.2355/isijinternational.isijint-2024-344

CiNii Research

O-05　バイオマス燃料の流動層燃焼炉における灰凝集評価

田内希, 宮下和大, 茂田潤一, 出町豊子, 植木保昭, 成瀬一郎

バイオマス科学会議発表論文集 20 巻 ( 0 ) 頁： 9 - 10 2024年12月

O-10　充填層ガス化炉における木質バイオマスのCO2ガス化特性

長谷川翔一, 出町豊子, 植木保昭, 成瀬一郎, 義家亮

バイオマス科学会議発表論文集 20 巻 ( 0 ) 頁： 19 - 20 2024年12月

O-06　多種バイオマス燃料の燃焼挙動の解明とそのモデル化

高橋広大, 出町豊子, 植木保昭, 成瀬一郎, 義家亮, 松成祥平

バイオマス科学会議発表論文集 20 巻 ( 0 ) 頁： 11 - 12 2024年12月

Degradation of solid oxide fuel cell anodes by the deposition of potassium compounds Open Access

Zhang, H; Yoshiie, R; Naruse, I; Ueki, Y

CARBON RESOURCES CONVERSION 7 巻 ( 4 ) 2024年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Carbon Resources Conversion

Alkali contents with low melting points in the ash of woody biomass vaporize during the biomass gasification process, damaging various downstream energy conversion devices, such as the solid oxide fuel cells (SOFCs). In this study, the degradation of SOFC anodes by the deposition of potassium compounds (KCl, K2CO3, and KOH) was investigated. An aqueous solution of potassium compounds was dripped onto the anode surface of the SOFC button cell at room temperature. After drying at 343 K, 6.964 × 10-6 mol KCl, 6.964 × 10-6 mol KOH, and 3.482 × 10-6 mol K2CO3 was deposited on the anode. Button cells with the deposition of K compounds were employed for power generation experiments at 1023 K with the supply of artificial syngas from biomass gasification. After the power generation experiments, the surface structures of the anodes were microscopically analyzed using the SEM and EDS. As a result, K compounds hardly affected the OCV of SOFC. With the addition of KCl, no apparent change in the anode structure was observed, and only a slight KCl deposit was detected. However, chloride tends to be chemisorbed on Ni, increasing the ohmic resistance as well as the adsorption/desorption resistance. However, KOH transformed to K2CO3 and then remained massively on the anode, which was clearly observed in the SEM images. K2CO3 significantly decreased the cell voltage under a current density of 100 mA·cm−2. Through impedance analyses, this voltage drop was mainly attributed to the ohmic resistance and gas diffusion resistance. However, there is no evidence that this deposit degrades Ni particles.

DOI： 10.1016/j.crcon.2024.100238

Open Access

Web of Science

Scopus

1-01　高温でのコークスのガス化反応過程における粉化挙動

鄭振傑, 植木保昭, 出町豊子, 成瀬一郎

石炭科学会議発表論文集 61 巻 ( 0 ) 頁： 2 - 3 2024年10月

2-12　廃棄物処理プラントにおける灰付着・高温腐食の低減技術

長沼宏, 澤田晃宏, 森岳人, 後藤妙子, 小坂祥枝, 成瀬一郎

石炭科学会議発表論文集 61 巻 ( 0 ) 頁： 52 - 53 2024年10月

1-11　バイオマス燃焼時の伝熱管へのCl付着挙動の解明

和田知歌子, 佐藤直樹, 渡邊和宏, 成瀬一郎

石炭科学会議発表論文集 61 巻 ( 0 ) 頁： 22 - 23 2024年10月

Comparative life cycle assessment of organic industrial solid waste co-disposal in a MSW incineration plant

Liu, YH; Li, AJ; Guo, GZ; Zhang, JW; Ren, Y; Dong, L; Gong, LF; Hu, HY; Yao, H; Naruse, I

ENERGY 305 巻 2024年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Energy

Co-disposal experiments involving industrial solid waste (ISW) are conducted at a municipal solid waste (MSW) incineration plant in this study, investing the environmental impact of co-disposal with different ISW addition proportions using life cycle assessment (LCA). Results show that increasing ISW proportions improves economic indicators, reducing the payback period from 7.92 years (0 % ISW) to 6.58 years (40 % ISW). Environmental impact indicators initially decrease and then increase. The indicator with the greatest environmental impact is Eutrophication Potential (EP), the only major indicator with positive values in all scenarios when considering power output. Its normalization value reaches a minimum at 30 % ISW blending, at 7.85 × 10−12. Contribution analysis reveals that the direct emissions of N-containing gases are the primary cause, while the addition of urea, ammonia water, and quicklime in flue gas treatment, as well as the ash-slag landfill, also have significant effects. Technical optimization of stepwise co-disposal, denitrification system and ash-slag reduction will be the focus. Compared to the existing conventional situation, the co-disposal system exhibits considerable improvements in environmental benefits and carbon reduction potential. Notably, there is a significant reduction in non-CO2 greenhouse gas emissions. This study offers theoretical insights for multi-source waste disposal in MSW incineration plants.

DOI： 10.1016/j.energy.2024.132322

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Scopus

3-3-2　廃プラスチックおよび木質バイオマスによる酸化鉄の還元挙動

加田航平, 出町豊子, 植木保昭, 成瀬一郎, 義家亮

日本エネルギー学会大会講演要旨集 33 巻 ( 0 ) 頁： 58 - 59 2024年7月

5-2-1　産業廃棄物によるエネルギーリカバリ時の灰溶融挙動および灰付着制御

向本舜, 出町豊子, 植木保昭, 成瀬一郎, 義家亮

日本エネルギー学会大会講演要旨集 33 巻 ( 0 ) 頁： 148 - 149 2024年7月

Processing plastic waste via pyrolysis-thermolysis into hydrogen and solid carbon additive to ethylene-vinyl acetate foam for cushioning applications

Wang, YX; Chang, BP; Veksha, A; Kashcheev, A; Tok, ALY; Lipik, V; Yoshiie, R; Ueki, Y; Naruse, I; Lisak, G

JOURNAL OF HAZARDOUS MATERIALS 464 巻頁： 132996 2024年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Hazardous Materials

A strategy for enhancing value creation from pyrolysis gas and oil, derived from plastic waste, through the generation of two additional outputs of solid carbon and hydrogen was investigated. Three types of hard-to-recycle plastic waste (marine plastic litter, household mixed plastics and cosmetic products packaging) were thermally treated in two stages: (i) decomposition of feedstock into gas and oil via pyrolysis at 600 °C; and (ii) thermolytic conversion of the pyrolysis gas and a fraction of oil into hydrogen and solid carbon at 1300 °C separately. The thermolysis of both pyrolysis gas and oil fractions predominantly resulted in the production of solid carbon (39–70 wt% per plastic feedstock and carbon content of 91.3–98.6 wt%) and H2-rich gas (H2 yield of 5.9–10.8 wt% per plastic waste feedstock and H2 content of 71.4–97.2 vol% per gas volume). The incorporation of pyrolysis oil into the thermolysis process could enhance the outputs of solid carbon and hydrogen. Characterizations of solid carbon and hydrogen obtained from pyrolysis gas and oil fractions were further conducted. The observed similar properties of H2 and solid carbon from pyrolysis gas and oil supported the feasibility of introducing all the pyrolytic products together into the thermolysis process without condensation of oil. To enhance the value of these solid carbon derived from plastics for practical usage, we utilized the obtained solid carbon as a reinforcing agent for polymer composite foam development. The solid carbon reinforced composite foam displayed great abrasion resistance (wear loss: 240 mg), compression strength (0.347 MPa), and dynamic impact properties (energy returned: 124 J/m and energy absorbed: 57.3 J/m), emphasizing the viability of solid carbon as a nucleating agent and reinforcing filler in polymer foam for cushioning applications. Overall, the strategy of pyrolysis-thermolysis, which harnesses both pyrolysis gas and oil, unlocks additional value creation by producing two new outputs from plastic waste. Depending on the market prices for solid carbon and hydrogen, this can substantially change the economics of plastic waste management and create new revenue streams, incentivizing plastic waste collection and processing.

DOI： 10.1016/j.jhazmat.2023.132996

Web of Science

Scopus

PubMed

Ash deposition and corrosion mechanisms of tubes in Waste-to-Energy plants

Naganuma, H; Mori, T; Watanabe, S; Sawada, A; Goto, T; Ueki, Y; Yoshiie, R; Naruse, I

MECHANICAL ENGINEERING JOURNAL 11 巻 ( 2 ) 頁： 23-00486 - 23-00486 2024年

Mechanism of arsenic migration and transformation during pulverized coal combustion

Huang, YD; Li, AJ; Hu, HY; Li, S; Zou, C; Zou, RJ; Wu, XJ; Naruse, I; Yao, H

PROCEEDINGS OF THE COMBUSTION INSTITUTE 40 巻 ( 1-4 ) 2024年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Proceedings of the Combustion Institute

The gaseous arsenic released from pulverized coal combustion not only poses environmental impacts but also causes the severe poisoning of selective catalytic reduction catalyst. The unclear understanding of the interactions between gaseous arsenic and minerals in coal hinders the arsenic emission control by promoting gaseous arsenic transformation into less troublesome particulate-bound arsenic. To clarify the mechanism of arsenic migration and transformation during pulverized coal combustion, field test, pilot-scale combustion trial, lab-scale adsorption experiment, and molecular-scale theoretical calculation were synergistically conducted in this study. The results demonstrated that the interactions between gaseous arsenic and mineral components included chemical reaction and oxidation process, which began at high temperatures (∼1350 °C) and mainly took place in medium-high temperature region (650∼1350 °C). The metakaolin, magnetite, hematite and anhydrite were found to be active components for the interactions. Among these, anhydrite was the main trapper for gaseous arsenic at high temperatures due to the high thermal stability of calcium arsenate. While metakaolin, magnetite and hematite owned high arsenic adsorption performance in medium-temperature region. In the process of flue-gas cooling, gaseous arsenic tended to be captured by anhydrite thereby forming calcium-bound arsenic at high temperatures, and subsequently reacted with metakaolin, magnetite and hematite by generating iron- or aluminum-bound arsenic as flue gas further cooled down. High flue-gas temperatures and ash components (especially magnetite and hematite) facilitated the arsenic oxidation to hypotoxic arsenate in fly ash. These findings provided the foundation for in-depth control of arsenic emission from coal combustion by promoting arsenic migration and transformation into fly ash.

DOI： 10.1016/j.proci.2024.105467

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Scopus

Influence mechanism of chlorine on arsenic release and transformation during municipal solid waste incineration

Li, S; Hu, HY; Zou, C; Dong, L; Huang, YD; Liu, H; Naruse, I; Yao, H

PROCEEDINGS OF THE COMBUSTION INSTITUTE 40 巻 ( 1-4 ) 2024年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Proceedings of the Combustion Institute

Arsenic release presents a critical environmental pollution issue during municipal solid waste (MSW) incineration. The increase of chlorine-containing waste for incineration processes has heightened interest in the volatilization of heavy metals induced by chlorine. However, the migration and transformation of arsenic, which has a strong affinity for oxygen at high temperatures, are less understood in the context of chlorine influence, leading to the absence of corresponding regulatory strategies. Therefore, this study first investigated the mass distribution of arsenic during co-incineration of MSW and chlorine-rich solid waste (plastics) in a grate incinerator. In addition, Ca3(AsO4)2 was selected as the predominant form of arsenate in the bottom ash to perform decomposition experiments under the influence of HCl, supported by thermodynamic calculations and density functional theory (DFT) calculations. The results demonstrated that chlorine enhances the migration of arsenic from the bottom ash to the fly ash during the co-incineration process. For the first time, it has been discovered that Ca3(AsO4)2 transforms into Ca5(AsO4)3Cl when exposed to HCl at high temperatures, releasing As2O3 (g) into the flue gas. Importantly, the presence of HCl significantly lowers the initial temperature for the release of As2O3 (g). This effect is attributed to the adsorption of chlorine from HCl onto the calcium atoms in Ca3(AsO4)2, which affects the binding energy of adjacent Ca-O-As structure, thereby facilitating arsenic release at lower energies. Furthermore, the initial transformation temperature of Ca3(AsO4)2 into Ca5(AsO4)3Cl is reduced from 1300 °C to 600 °C in a high-chlorine atmosphere, which was obtained by incorporating the thermal properties of Ca5(AsO4)3Cl. These insights are crucial for the understanding of arsenic transformation in high-chlorine environments and offer guidance for arsenic emissions control during the incineration of chlorine-rich solid waste.

DOI： 10.1016/j.proci.2024.105586

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Scopus

Electrochemical characteristics of solid oxide fuel cells supplied with CO-rich fuel gases Open Access

Zhang, H; Onogi, R; Yoshiie, R; Ueki, Y; Naruse, I

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY 19 巻 ( 1 ) 頁： 23-00525 - 23-00525 2024年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人日本機械学会・社団法人日本伝熱学会

CO2 biomass gasification is an attractive option for reducing CO2 emission which produces gas mixtures with higher CO concentrations than typical syngas compositions. However, carbon deposition and catalyst degradation may occur when CO-rich fuel gas is supplied to a Ni-Yttria-stabilized Zirconia solid oxide-based fuel cell. In this study, the electrochemical performance of an SOFC (anode: NiO-YSZ/NiO-GDC) with various CO-rich gas compositions was experimentally investigated. Four distinct gas mixtures were tested using electrochemical experiments at 1073 K. Impedance and steady-state polarization measurements were taken, and electric power generation was assessed at 100 mA·cm-2 under the 4 gas mixtures. Gas 1, a mixture of H2 (38%), CO (19%), CO2 (9.5%), and H2O (5%) was prepared as a reference gas to model a typical syngas mixture obtained from biomass gasifier. It generated the highest voltage without any degradation of the anode over 8 h. Gas 2, containing CO (19%), CO2 (9.5%), and H2O (5%), caused serious anode degradation compared with Gas 1. Gas 3, containing CO (19%) and H2O (5%) showed good performance with a relatively small polarization resistance and good stability in long-term electric power generation test. Gas 4, consisting of CO (20%) and CO2 (10%), exhibited the largest charge-transfer resistance at low overpotential and a significant diffusion resistance at high overpotential. Additionally, Gas 4 had the worst stability in the electric power generation test. Based on these results, we conclude that biomass gasification gas is a promising fuel for use in SOFCs. CO direct oxidation can provide electric power generation, although it appears to be unstable and shows high resistance at both low and high overpotentials. H2O addition can efficiently improve the stability of the CO direct oxidation process.

DOI： 10.1299/jtst.23-00525

産業廃棄物処理炉内における灰付着機構の解明とその制御

新居大生, 出町豊子, 植木保昭, 成瀬一郎, 義家亮

廃棄物資源循環学会研究発表会講演集 35 巻 ( 0 ) 頁： 395 2024年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人廃棄物資源循環学会

廃棄物由来の燃料を用いる焼却炉やボイラにおいて生じるスラッギングやファウリングといった伝熱管表面への灰付着は，伝熱阻害による発電効率の低下や焼却炉の運転阻害，伝熱管表面の化学腐食に起因するボイラ蒸気の高温および高圧化の阻害等の問題を発生させている．そこで本研究では，より高温および高圧な蒸気条件の実用化に向けて，産業廃棄物灰の溶融挙動を解明するとともに，灰付着を低減することのできる伝熱管表面への溶射材料の検討を行った．各材料を用いて接触角測定実験及びSEM/EDX分析を実施することで溶射材料の難灰付着性、耐食性について検討した．接触角測定実験から，いずれの条件でも開発材料Ni-2はSUS310Sよりも接触角が大きく，灰付着抑制・低減できると考察できる．また，SEM/EDX分析の結果から，Ni-2はSUS310Sに比べて溶融灰による化学腐食の進行を抑制できると考えられる．

DOI： 10.14912/jsmcwm.35.0_395

CiNii Research

速度解析論による多様なバイオマス粒子の揮発分放出挙動の解明

松成祥平, 高橋広大, 植木保昭, 義家亮, 成瀬一郎

動力・エネルギー技術の最前線講演論文集 : シンポジウム 2024.28 巻 ( 0 ) 頁： A113 2024年

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