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論文 - 則永　行庸

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Durability and fire-hazardous-risk evaluation of unique phase separation solvent using high-boiling amine and ether 査読有り

Maeda N., Kishimoto A., Machida H., Yamaguchi T., Yanase K., Norinaga K.

15th Greenhouse Gas Control Technologies Conference 2021 Ghgt 2021 2021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：15th Greenhouse Gas Control Technologies Conference 2021 Ghgt 2021

Durability and fire hazard risk evaluation were conducted to determine the process feasibility on the unique phase separation solvent with low regeneration temperature (90 °C), consisting of amine, ether, and small amount of water. The results we obtained are as follows; I) The amine degradation rate of the phase separation solvent would be less than 1/10 of that of monoethanolamine (MEA), which was contributed by its high oxidative resistant nature and low regeneration temperature. II) The gas composition formed in the absorber was completely out of combustible range and almost no accumulations of explosive compounds such as peroxides were observed when in contact with 6 % oxygen containing gas (dry base). Therefore, we believe that the phase separation solvent is applicable to the treatment of exhaust gas from coal-fired thermal power plants.

Scopus

Energy analysis of CO2 separation process with low energy consumption using phase separation solvent 査読有り

Maeda N., Nakanishi K., Kishimoto A., Machida H., Yamaguchi T., Norinaga K.

15th Greenhouse Gas Control Technologies Conference 2021 Ghgt 2021 2021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：15th Greenhouse Gas Control Technologies Conference 2021 Ghgt 2021

We calculated the energy required for regeneration when the phase separation solvent solvent is applied to the treatment of exhaust gas from coal-fired power plants. This solvent is characterized by regeneration at a low temperature of less than 100°C. As a result, it was clarified that under ideal conditions with no pressure drop and no heat loss, the required energy could be suppressed to 1.5 GJ/ton-CO2 by satisfying the following conditions; i) pinch point of the heat exchanger between rich-amine and lean-amine: 1 °C, ii) water concentration of the solvent: kept at 10 wt%, iii) COP of the heat pump: 5.5. However, increase of the pinch point, increase of the water concentration, and decrease of the COP will all result in a significant increase in the required energy. Therefore, in order to realize a process with low energy consumption, it is essential to meet these design constraints.

Scopus

2-14 触媒層温度及びガス組成分布を考慮した解析によるメタネーション反応速度モデルの検討査読有り

安田将也, 町田洋, 則永行庸

石炭科学会議発表論文集 57 巻 ( 0 ) 頁： 44 - 45 2020年10月

2-16 CO2分離回収の省エネルギー化に向けた相分離吸収剤およびH2ストリッピングプロセスの開発査読有り

町田洋, 走出龍星, 鈴木健弘, 西尾仁志, 柳瀬慶一, チャンクウィン, 則永行庸

石炭科学会議発表論文集 57 巻 ( 0 ) 頁： 48 - 49 2020年10月

Online composition analysis of phase separation solvent for carbon dioxide capture using ATR-FT-IR 査読有り

Sato M., Tran K.V.B., Yamaguchi T., Machida H., Norinaga K.

Journal of Advanced Manufacturing and Processing 2 巻 ( 4 ) 2020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：Journal of Advanced Manufacturing and Processing

An amine solvent that undergoes phase change after absorption of CO<inf>2</inf> has been studied to reduce the energy consumed during the CO<inf>2</inf> capture process. Depending on the components of the solvent, the CO<inf>2</inf>-rich phase can be separated for the regeneration step or the component in CO<inf>2</inf>-lean phase accelerates the regeneration step in the solvent that undergoes liquid-liquid phase change. Since the homogeneous solvent separates into two liquid phases after CO<inf>2</inf> absorption, an analysis method to track the change in chemical species during the absorption process, especially at the phase separation time, is necessary to illuminate the phenomenon. To establish an online method to analyze the components of the solvent, a Fourier-transform infrared (FT-IR) spectrometer equipped with an attenuated total reflection (ATR) probe was used during the CO<inf>2</inf> absorption of phase separation solvent composed of amine, ether, and water. The calibration samples of amines, ethers, and CO<inf>2</inf>-loaded solutions were used to develop the partial least square regression model. The consumption of reactants, as well as the formation of products, can be monitored quantitatively using the FT-IR spectra. Utilizing this information, the changes in the chemical species shed light on the phase separation mechanism of this solvent: ether was pushed out of the solvent to form a CO<inf>2</inf>-lean phase due to its hydrophobicity, while CO<inf>2</inf> and its products along with amine and water remain in the CO<inf>2</inf>-rich phase. Without sampling, this rapid and high-accuracy method is suitable for closed processes, especially for a high-pressure process.

DOI： 10.1002/amp2.10067

Scopus

Rate of CO2 absorption of a phase-separation absorbent 査読有り

Esaki T., Machida H., Norinaga K.

Journal of Advanced Manufacturing and Processing 2 巻 ( 1 ) 2020年1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 Advanced Manufacturing and Processing

In this study, we evaluated the CO<inf>2</inf> absorption characteristics of a phase-separation amine absorbent. The phase-separation absorbent consists of a 30:60:10 (by weight percent) mixture of 2-(ethylamino)ethanol, diethylene glycol diethyl ether, and water. The CO<inf>2</inf> absorption rate of the phase-separation absorbent was measured in a lab-scale counter flow absorber. In addition, the CO<inf>2</inf> transport phenomena in the absorber were analyzed by performing model fitting. The experimental results revealed that the CO<inf>2</inf> absorption rates are different before and after phase separation. In fact, the overall CO<inf>2</inf> absorption capacity coefficient after phase separation is 4.5 times higher than that obtained before phase separation. By changing the gas-liquid ratio, we obtained a CO<inf>2</inf> recovery ratio of over 80% using the model. Thus, the absorption temperature, CO<inf>2</inf> loading, and gas-liquid ratio can be tuned to obtain the desired CO<inf>2</inf> recovery ratio.

DOI： 10.1002/amp2.10033

Scopus

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査読有り

溝口莉彩, 町田洋, 則永行庸

石炭科学会議発表論文集 56 巻 ( 0 ) 頁： 24 - 25 2019年10月

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査読有り

安達希美, 町田洋, 則永行庸

石炭科学会議発表論文集 56 巻 ( 0 ) 頁： 56 - 57 2019年10月

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査読有り

福岡鉄也, 町田洋, 則永行庸

石炭科学会議発表論文集 56 巻 ( 0 ) 頁： 44 - 45 2019年10月

1-13 相分離型省エネルギーCO2吸収剤のCO2吸収再生性能評価査読有り

鈴木健弘, 西尾仁志, 柳瀬慶一, 町田洋, 則永行庸

石炭科学会議発表論文集 56 巻 ( 0 ) 頁： 26 - 27 2019年10月

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査読有り

安達希美, 町田洋, 則永行庸

日本エネルギー学会大会講演要旨集 28 巻 ( 0 ) 頁： 10 - 11 2019年7月

2-1-2 触媒固定床反応器による実験に基づくCO2メタン化反応速度モデルの構築査読有り

安田将也, 町田洋, 則永行庸, 高野裕之, 泉屋宏一

日本エネルギー学会大会講演要旨集 28 巻 ( 0 ) 頁： 32 - 33 2019年7月

Continuous monitoring of char surface activity toward benzene 査読有り Open Access

Choi C., Shima K., Kudo S., Norinaga K., Gao X., Hayashi J.i.

Carbon Resources Conversion 2 巻 ( 1 ) 頁： 43 - 50 2019年4月

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：Carbon Resources Conversion

Kinetics of thermal decomposition of benzene on lignite-derived char was investigated at 900 °C by applying a new method to continuously monitor the char surface activity. Benzene vapor was continuously forced to pass through a micro fixed bed of char with residence time as short as 7.6 ms, and then detected continuously by a flame-ionization detector. Results showed the presence of two different types of char surfaces; consumptive Type I surface and non-consumptive (sustainable) Type II surface. Type I surface of a partially CO<inf>2</inf>-gasified char had an capacity of carbon deposit from benzene over 20 wt%-char and an initial activity (represented by a first-order rate constant) as high as 160 s−1. Both of them decreased with increasing carbon deposit due to consumption of micropores accessible to benzene, and finally became zero leaving Type II surface that had a very stable activity with rate constant of 4 s−1. The chars without gasification had capacities of Type I surfaces smaller by two orders of magnitude than the partially gasified char, while the Type II surfaces had activities similar to that of the partially gasified char. It was found that Type II surface converted benzene into not only carbon deposit but also diaromatics and even greater aromatics. Composition of the greater aromatics was unknown because they were deposited onto the reactor wall immediately after passing through the char bed.

DOI： 10.1016/j.crcon.2018.12.001

Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from lignite 査読有り Open Access

Choi C., Ashik U.P.M., Kudo S., Uebo K., Norinaga K., Hayashi J.i.

Carbon Resources Conversion 2 巻 ( 1 ) 頁： 13 - 22 2019年4月

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：Carbon Resources Conversion

Inherent metallic species retained by coal char or coke, such as Na and Ca, behave as catalysts in gasification. The char/coke normally contains inherent SiO<inf>2</inf>, which can react with the inherent catalysts to form silicates, resulting in catalyst deactivation over the range of pyrolysis, carbonization and gasification, and thereby reducing the char/coke reactivity. The present authors simulated the inherent catalyst deactivation experimentally by blending a Victorian lignite with SiO<inf>2</inf>, briquetting the SiO<inf>2</inf>/lignite blend, carbonizing the briquette, and then gasifying the coke with CO<inf>2</inf>. The kinetic analysis of the gasification employed a comprehensive model, which assumed progress in parallel of non-catalytic and catalytic gasification. The model quantitatively described the measured kinetics of the coke gasification with different SiO<inf>2</inf> contents over a range of coke conversion up to 99.9%. The kinetic analysis revealed that the SiO<inf>2</inf> deactivated substantial and entire portions of the most active catalyst and its precursor, respectively, before the gasification (i.e., during the carbonization). The catalyst deactivation also occurred during the gasification, but mainly following a self-deactivation mechanism that involved no silicates formation.

DOI： 10.1016/j.crcon.2018.09.002

An approach for quantifying transferable hydrogen in pyrolyzing coals 査読有り

Norinaga K., Fukuoka T., Machida H., Zhang W.

36th Annual International Pittsburgh Coal Conference Clean Coal Based Energy Fuels and the Environment PCC 2019 2019年

Reducing energy required for CO2 separation and recovery process by employing phase separation solvents 査読有り

Norinaga K., Nishio H., Khuyen T., Machida H.

36th Annual International Pittsburgh Coal Conference Clean Coal Based Energy Fuels and the Environment PCC 2019 2019年

An approach for quantifying transferable hydrogen in pyrolyzing coals 査読有り

Norinaga K, Fukuoka T, Machida H, Zhang W

36th Annual International Pittsburgh Coal Conference: Clean Coal-Based Energy/Fuels and the Environment, PCC 2019 2019年

Reducing energy required for CO<inf>2</inf> separation and recovery process by employing phase separation solvents 査読有り

Norinaga K, Nishio H, Khuyen T, Machida H

36th Annual International Pittsburgh Coal Conference: Clean Coal-Based Energy/Fuels and the Environment, PCC 2019 2019年

Prediction of hot coke oven gas reforming by LES coupled with the extended flamelet/progress variable approach 査読有り

Yu, PL; Norinaga, K; Watanabe, H; Kitagawa, T

FUEL 231 巻頁： 234 - 243 2018年11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

Large-eddy simulation (LES) coupled with the extended flamelet/progress variable approach (EFPV) has been performed to predict characteristics of reacting flows in a bench-scale hot coke oven gas (HCOG) reformer. In order to investigate the capability of capturing effects of operating conditions, simulations were carried out in two different cases in which the coke oven gas temperature and oxygen ratio were altered. Results showed that the LES coupled with the EFPV performed very well in terms of predicting temperature distribution as well as the temperature variation trend between the two cases. In addition, major species such as H<inf>2</inf>, CO, CO<inf>2</inf>, H<inf>2</inf>O and CH<inf>4</inf>, as well as minor species like benzene and some typical polycyclic aromatic hydrocarbons (PAH) were analyzed to illustrate their activities and dominant chemical events. With regards to the composition of the dry reformed gas, comparisons were made between the experimental data and the numerical simulation results, and reasonable results have been obtained. It has been confirmed that the general feature of the reacting flows in the HCOG reformer can be precisely captured by the present LES.

DOI： 10.1016/j.fuel.2018.05.104

Web of Science

Scopus

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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査読有り

町田洋, 西尾仁志, 則永行庸, 江崎丈裕

石炭科学会議発表論文集 55 巻 ( 0 ) 頁： 84 - 85 2018年10月

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