講演・口頭発表等 - 則永　行庸

1-12　CO₂メタネーション反応器における伝熱と流動に関する数値解析

Zhang Wei, 溝口 莉彩, 町田 洋, 則永 行庸

石炭科学会議発表論文集 

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開催年月日： 2019年

記述言語：日本語   会議種別：口頭発表（一般）  

<p>This paper reports a numerical study for a singl e shell and tube rea ctor of CO₂ methanation with a 1.5 m long reaction zone. A new conjugate heat transfer solver is developed based on the open-source OpenFOAM code. The newly developed solver solves the heat transfer problem as well as the reactions happen in the gas phase. The reactor is meshed with fully resolved gas, solid, and coolant regions , Two-temperature model is considered to solve the temperature of catalyst bed . The tube diam e ter is changed to investi gate the effect on the hot spot formation. The results show that the diameter of the tube is an important factor in determining the tem perature profiles of the catalyst bed as well as reacting gas. The peak t emperature of the hot spot was decreased from 980 to 770K with decreasing the tube diame ter from 32 to 14mm at a GHSV=3428h^-1.</p>

DOI： 10.20550/jiesekitanronbun.56.0_24

CiNii Research

2-5　詳細反応化学速度モデルを用いた噴流床石炭ガス化炉における芳香族炭化水素の改質およびスス生成シミュレーション

CHOI Cheolyong, 安達 希美, 町田 洋, 則永 行庸

石炭科学会議発表論文集 

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開催年月日： 2019年

記述言語：日本語   会議種別：口頭発表（一般）  

<p>Tar evolved from coal pyrolysis contains polycyclic aromatic hydrocarbons (PAHs) that grow to soot through further aromatization in parall el with its reforming during gasification. Understanding of the chemistry and kinetics in a gasifier is important for developing low-temperature gasification. This work focused on numerical simulation of PAH reforming and soot formation in various coal typ es and gasification modes. A detailed chemical kinetic model was used for simulating a reductor of a two stage entrained flow gasifier under the gas composition determined by combination of experimental molecular composition of coal and inorganic gas compo sition at chemical equilibrium. O₂/CO₂-and O₂ /H₂O-blown modes significantly reduced the yield of PAHs and the formation of soot. Growth of soot particle was dominated by acetylene addition above 1300°C, while nucleation of soot precursors and PAH condensat ion became dominant at lower temperature.</p>

DOI： 10.20550/jiesekitanronbun.56.0_56

CiNii Research

1-22　石炭熱分解時の芳香族クラスター成長により発生する水素の転換反応機構

福岡 鉄也, CHOI Cheolyong, 町田 洋, 則永 行庸

石炭科学会議発表論文集 

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開催年月日： 2019年

記述言語：日本語   会議種別：口頭発表（一般）  

<p>Changes in chemical structure of coal during carbonization are important factors to determine properties of softening and melting. It is believed that the caking properties are directly affected by transferable hydrogen, and its consumption lowers the degree of caking. Investigation of the fate of the hydrogen during carbonization is thus necessary for understanding the characteristics of caking. This work conducted quantitative analyses of the chemical structure of coke derived from caking and non-caking coal, together with an online gas analysis. As a result, the transferable hydrogen derived from the non-caking coal was partly consumed for decomposition of the functional groups such as ethers during carbonization, while that from the caking coal was little consumed.</p>

DOI： 10.20550/jiesekitanronbun.56.0_44

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1-2-2 石炭ガス化炉内硫黄化合物転換特性の詳細化学反応速度モデルに基づく解析

安達 希美, Choi Cheolyong, ZHANG Wei, 町田 洋, 則永 行庸

日本エネルギー学会大会講演要旨集 

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開催年月日： 2019年

記述言語：日本語   会議種別：口頭発表（一般）  

<p>Toward developing an environmentally-friendly coal gasification process, a deeper understanding of chemistry and kinetics of reactions happening in a gasifier is of great importance. This work presents a numerical approach to predict conversion characteristics of sulfur compounds in a reductor of a two-stage entrained flow coal gasifier. A detailed chemical kinetic model consisting of 1951 reactions and 257 chemical species were used to calculate concentration profiles along with the reductor position at different gasification modes, temperature, and coal types. The sulfur compounds were mainly converted into H₂S, whereas COS is a second major product at the reductor outlet and the formation is more enhanced at an O₂/CO₂-blowing mode than those at air-, and O₂/H₂O-blowing modes. The predicted total concentrations of H₂S and COS are ranged between 400 and 800 ppm and agreed with the results obtained with an air-blowing 200 ton/day test coal gasification plant reported in the literature.</p>

DOI： 10.20550/jietaikaiyoushi.28.0_10

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1-13　相分離型省エネルギーCO₂吸収剤のCO₂吸収再生性能評価

鈴木 健弘, 西尾 仁志, Tran Khuyen, 柳瀬 慶一, 町田 洋, 則永 行庸

石炭科学会議発表論文集 

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開催年月日： 2019年

記述言語：日本語   会議種別：口頭発表（一般）  

<p>Carbon dioxide capture and storage (CCS) is expected to play a role in combating global warming. Thus,</p><p>research and development are progressing around the world. However, there are limitations such as the</p><p>demonstration examples being limited to cases where the CO₂ capture site and storage site are close. In recent years, Carbon dioxide Capture and Utilization (CCU) using captured CO₂ has attracted attention.</p><p>This time, we will focus on technologies that reduce CO₂ and convert it into fuels and chemicals, mainly focusing on methanation. Energy saving can be achieved by integrating the CO₂ capture process and the CO₂ utilization process.</p><p>In this paper, we report the results of energy calculation in the CO₂ separation by the new process using the phase-separated type CO₂ absorbent developed so far, and the experimental results of continuous operation using this process.</p>

DOI： 10.20550/jiesekitanronbun.56.0_26

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No.2-19 アミン/エーテル混合吸収剤を用いたCO₂分離回収プロセスの省エネルギー化

町田 洋, 西尾 仁志, KHUYEN Tran, 則永 行庸, 江崎 丈裕

石炭科学会議発表論文集 

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開催年月日： 2018年

記述言語：日本語   会議種別：口頭発表（一般）  

<p>It has been recognized that the CO₂ separation and recovery process accounts around 60% of the total cost for operating CO₂ capture and storage (CCS). The CO₂ chemical absorption with a conventional amine solvent like monoethanol amine requires around 4 GJ/t-CO₂ for CO₂ recovery. Recently we developed phase separation solvent system which consists of not only amine but also hydrophobic solvent, ether. This system, before CO₂ absorption, we have single phase, while after CO₂ absorption, we have phase separation, one is CO₂ rich phase and the other is CO₂ lean phase. We can expect that the energy can significantly be reduced because it is not necessary to regenerate whole solvent but only the CO₂ rich phase is to be regenerated. In this study, we examined the phase phenomena for 9 types of amine and a hydrophobic solvent mixture before and after CO₂ absorption to find phase separation solvent system to minimize energy for CO₂ recovery. Based on the observation, the mechanism for the phase separation and solvent regeneration is also discussed.</p>

DOI： 10.20550/jiesekitanronbun.55.0_84

CiNii Research

No.2-30 石炭および熱分解チャーの化学構造および熱分解時ガス発生特性の定量的評価

福岡 鉄也, 町田 洋, 則永 行庸

石炭科学会議発表論文集 

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開催年月日： 2018年

記述言語：日本語   会議種別：口頭発表（一般）  

<p>Changes in the chemical structure of coal during the dry distillation process and the composition and production characteristics of volatile components are important factors related to the mechanism of caking property development and the physical properties of coke masses and analyzed by various methods. However, up to now, analysis of volatile components and structural analysis of solid char are mostly performed individually, and it is difficult to combine both and to obtain quantitative knowledge on the thermal decomposition reaction mechanism. In this study, we tried to measure composition of dry distillation for caking coal and subbituminous coal using online gas analysis, and analyze changes of coal chemical structure using several spectroscopic methods (NMR, FT-IR, XPS etc.), integrated the obtained information to combine the former and the latter, and attempted to obtain new understanding of the coal dry distillation mechanism.</p>

DOI： 10.20550/jiesekitanronbun.55.0_110

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7-2-4 相分離型CO₂吸収剤による省エネルギーCO₂分離技術開発

町田 洋, 江崎 丈裕, 山口 毅, 堀添 浩俊, 則永 行庸, 岸本 啓, 松岡 亮, 秋山 勝哉, 西村 真

日本エネルギー学会大会講演要旨集 

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開催年月日： 2017年

記述言語：英語   会議種別：口頭発表（一般）  

<p>Phase separation type CO₂ capture solvent was developed which transforms into two liquid phases after CO₂ absorption. At first, we checked the phase phenomena of 9 types of amine and 3 types of polyether combinations. There shows three types; keeping one liquid phase before and after CO₂ absorption, transforming into two liquid phase after CO₂ absorption, forming initially two liquid phases. CO₂ solubility of the developed phase separation solvent was measured. The results show that the phase separation solvent can reduce the temperature difference between absorber and desorber than that of conventional amine solvent. Required energy for CO₂ capture using phase separation solvent was estimated under 2.0 GJ/ton-CO₂.</p>

DOI： 10.20550/jietaikaiyoushi.26.0_228

CiNii Research

P-3-3 初期熱分解及び二次気相分解の素反応モデル連成によるリグニン急速熱分解生成物組成の予測

古谷 優樹, 堂原 裕騎, 工藤 真二, 林 潤一郎, 則永 行庸

日本エネルギー学会大会講演要旨集 

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開催年月日： 2017年

記述言語：日本語   会議種別：口頭発表（一般）  

<p>A set of lignin pyrolysis processes involving primary pyrolysis and secondary vapor-phase reactions were described with a detailed chemical kinetic model (DCKM). The DCKM of primary pyrolysis, which characterizes lignin structures as three model compounds, predicted the yields of volatiles (c.a. 22 gas species and 10 monolignols) derived from primary pyrolysis. The original DCKM of secondary vapor-phase reactions did not involve the kinetic database on vapor-phase reaction of monolignols. Thus, the pyrolytic pathways of 1-(4-hydroxy-3,5-dimethoxyphenyl)prop-2-en-1-one (HDPP) accounted for 60 - 80 wt% of total monolignol species were proposed, and total 230 elementary reaction rate constants obtained by ab initio theory were added into the original kinetic database. The simulation of secondary vapor-phase reaction was performed using the volatile composition predicted by the DCKM of primary pyrolysis as a boundary condition. The established kinetic models successfully reproduced the yields of H₂O and char, but at high temperature overestimated tar yield and underestimated CO yield. This is probably due to the insufficient kinetic model of the secondary vapor phase reaction, which did not include the decomposition pathways of the monolignols except for HDPP.</p>

DOI： 10.20550/jietaikaiyoushi.26.0_268

CiNii Research

アミン・水・エーテル・CO2混合系吸収液の密度・粘度の測定とモデル化

佐藤 美帆、Tran Khuyen Viet Bao、柳瀬 慶一、町田 洋、則永 行庸

第51回化学工学会秋季大会  2020年9月24日 

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記述言語：日本語   会議種別：口頭発表（一般）  

冷熱を利用した大気中二酸化炭素直接回収の研究開発 招待有り

則永　行庸

化学工学会第86年会　第7回化学工学ビジョンシンポジウム「2050年脱炭素社会への道」－脱炭素社会に向けた国内外の情勢  2021年3月21日 

化学吸収法によるCO2分離回収の新展開 招待有り

則永　行庸

革新的CO2分離回収技術シンポジウム ～地球温暖化防止に貢献する固体吸収材及び膜による分離回収技術の最新動向～  2021年2月2日 

化学吸収法による省エネルギーCO2分離回収の新たな展開 招待有り

町田洋、則永行庸

CCR研究会  2020年12月18日  CCR研究会

メタネーションの実証とCO2分離回収の省エネ化に向けた基盤研究 招待有り

則永　行庸

『再生可能エネルギーからの水素製造・利用関連技術研究会』第二回研究会  2020年11月2日 

炭素循環利用に向けたCO2有効利用及びCO2分離回収に関する基盤研究 招待有り

則永　行庸

地球環境技術推進懇談会（2020年度第2回）  2020年10月29日  大阪科学技術センター

化学気相浸透法による複合材料製造における基材緻密化過程の数値シミュレーション 招待有り

則永　行庸

日本学術振興会　先進セラミックス第124委員会 第160回研究会  2020年10月13日 

炭素循環利用に関わる反応器設計に向けた流動・伝熱・反応シミュレーション 招待有り

則永　行庸

化学工学会 第51回秋季大会  2020年9月25日 

メタネーション実用化に向けた基盤技術開発 招待有り

則永　行庸

日本ガス協会低炭素技術研究会  2020年9月14日  日本ガス協会

相分離型CO2吸収剤の吸収特性に及ぼす添加剤の影響

走出 龍星、柳瀬 慶一、町田 洋、則永 行庸

第51回化学工学会秋季大会  2020年9月24日 

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記述言語：日本語   会議種別：ポスター発表  

アミン・エーテル・水3成分系液液相平衡測定

戴 溶池、チャン クゥイン、柳瀬 慶一、町田 洋、則永 行庸

第51回化学工学会秋季大会  2020年9月24日 

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記述言語：日本語   会議種別：ポスター発表