Faculty Profiles - NORINAGA Koyo

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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

Event date： 2019

Language：Japanese Presentation type：Oral presentation (general)

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.

DOI： 10.20550/jiesekitanronbun.56.0_24

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

Event date： 2019

Language：Japanese Presentation type：Oral presentation (general)

Carbon dioxide capture and storage (CCS) is expected to play a role in combating global warming. Thus,research and development are progressing around the world. However, there are limitations such as thedemonstration 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.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.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.

DOI： 10.20550/jiesekitanronbun.56.0_26

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

Event date： 2019

Language：Japanese Presentation type：Oral presentation (general)

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.

DOI： 10.20550/jiesekitanronbun.56.0_56

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

Event date： 2019

Language：Japanese Presentation type：Oral presentation (general)

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.

DOI： 10.20550/jiesekitanronbun.56.0_44

1-2-2 Detailed chemical kinetic modeling for conversion characteristics of sulfur compounds in a two-stage entrained flow coal gasifier

ADACHI Nozomi, Choi Cheolyong, ZHANG Wei, MACHIDA Hiroshi, NORINAGA Koyo

Proceedings of the Annual Conference of The Japan Institute of Energy

Event date： 2019

Language：Japanese Presentation type：Oral presentation (general)

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.

DOI： 10.20550/jietaikaiyoushi.28.0_10

No.2-19 Reducing energy required for CO2 separation/recovery process by employing amine/ether mixed absorbent

MACHIDA Hiroshi, NISHIO Hitoshi, KHUYEN Tran, NORIANGA Koyo, ESAKI Takehiro

Proceedings of Conference on Coal Science

Event date： 2018

Language：Japanese Presentation type：Oral presentation (general)

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.

DOI： 10.20550/jiesekitanronbun.55.0_84

No.2-30 Chemical structure of coal and pyrolysis char and Quantitative evaluation of gas generation characteristics during pyrolysis

FUKUOKA Tetsuya, MACHIDA Hiroshi, NORINAGA Koyo

Proceedings of Conference on Coal Science

Event date： 2018

Language：Japanese Presentation type：Oral presentation (general)

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.

DOI： 10.20550/jiesekitanronbun.55.0_110

7-2-4 Development of energy-saving CO2 capture process using phase separation absorbent

MACHIDA Hiroshi, ESAKI Takehiro, YAMAGUCHI Tsuyoshi, HORIZOE Hirotoshi, NORINAGA Koyo, KISHIMOTO Akira, MATSUOKA Akira, AKIYAMA Katsuya, NISHIMURA Makoto

Proceedings of the Annual Conference of The Japan Institute of Energy

Event date： 2017

Language：English Presentation type：Oral presentation (general)

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.

DOI： 10.20550/jietaikaiyoushi.26.0_228

P-3-3 Detailed Chemical Kinetic Modeling of Primary and Secondary Pyrolysis of Lignin

FURUTANI Yuki, DOHARA Yuki, KUDO Shinji, HAYASHI Jun-ichiro, NORINAGA Koyo

Proceedings of the Annual Conference of The Japan Institute of Energy

Event date： 2017

Language：Japanese Presentation type：Oral presentation (general)

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.

DOI： 10.20550/jietaikaiyoushi.26.0_268

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 2020.9.24

冷熱を利用した大気中二酸化炭素直接回収の研究開発 Invited

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 2021.3.21

化学吸収法によるCO2分離回収の新展開 Invited

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～ 2021.2.2

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 Invited

町田洋、則永行庸

CCR研究会 2020.12.18 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 Invited

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 2020.11.2

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 Invited

則永　行庸

地球環境技術推進懇談会（2020年度第2回） 2020.10.29 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 Invited

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 2020.10.13

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 Invited

則永　行庸

化学工学会第51回秋季大会 2020.9.25

メタネーション実用化に向けた基盤技術開発 Invited

則永　行庸

日本ガス協会低炭素技術研究会 2020.9.14 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 2020.9.24

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 2020.9.24

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