研究者詳細 - 李　坤朋

In recent years, the use of electricity from renewable energy sources such as solar and wind power has been more widespread, and their conversion into gaseous fuels such as hydrogen and methane has been considered. Methane, as the primary component of natural gas, holds significant value as a gaseous fuel due to its compatibility with existing transportation infrastructure and consumer appliances. We have confirmed by numerical analysis that a cylindrical solid oxide electrolytic cell (SOEC) can produce highly pure methane with high efficiency(1-3). The system is characterized by the integration of co-electrolysis of raw gas and methane synthesis inside the SOEC, where co-electrolysis is performed inside the SOEC and methane synthesis is performed outside the SOEC at a later stage. Compared with systems in which electrolysis and methane synthesis are performed separately, this system has the potential to simplify the system and improve its efficiency. In this study, a small test model simulating the integrated system was fabricated and tested to evaluate the feasibility of the system and to identify technical issues. The validity of the numerical analysis model was verified by comparing the experimental and numerical analysis results.

Ultra-elevated power density and high energy efficiency of protonic ceramic fuel cells: Numerical and experimental results

Li, KP; Shimada, H; Mizutani, Y; Okuyama, Y; Araki, T

ENERGY CONVERSION AND MANAGEMENT 296 2023年11月

DOI Web of Science

記述言語：その他外国語掲載種別：研究論文（学術雑誌）共著

一体化SOEC共電解セル中の実測メタネーション反応速度を考慮した数値解析

川中涼介, 荒木拓人, 阿部孝之, 高寺亮伍, 李坤朋

動力・エネルギー技術の最前線講演論文集 : シンポジウム 2022.26 ( 0 ) D114 2022年

DOI CiNii Research

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：一般社団法人日本機械学会共著

In recent years, renewable energy-based power generation methods such as solar power generation have been attracting attention as an alternative to fossil fuel-based power generation methods such as thermal power generation to prevent global warming. In order to decarbonize the heat sector in addition to the power sector, the conversion of electricity derived from renewable energy sources into gaseous fuels such as hydrogen and methane is being considered. In this study, a solid oxide electrolytic cell was employed as a means of converting electricity into gaseous fuels. In addition, considering the simultaneous co-electrolysis and methanation inside the SOEC cell, a model that takes into account the temperature field inside the cell was developed and analyzed numerically. The reaction rates of the shift and methanation reactions were measured, and the obtained results were incorporated into the analysis to make the model more realistic. The results showed the potential to produce high-purity methane through a simpler system with lower facility costs.

Improvement of Time-zero Analysis Method in Activity Evaluation of Powder Electrocatalyst for Gas Evolution Reaction

Nagasawa Kensaku, Li Kunpeng, Takenaga Yu, Kuroda Yoshiyuki, Mitsushima Shigenori

ELECTROCHEMISTRY 90 ( 4 ) 2022年

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Numerical analysis of current efficiency distributions in a protonic ceramic fuel cell using Nernst-Planck-Poisson model

Li Kunpeng, Araki Takuto, Kawamura Toshiki, Ota Atsuhito, Okuyama Yuji

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 45 ( 58 ) 34139 - 34149 2020年11月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

SOEC形メタン混合ガス製造システムと都市ガス13Aへの添加可能量の検討

李坤朋, 森昌史, 荒木拓人

日本エネルギー学会誌 99 ( 2 ) 20 - 27 2020年2月

DOI Web of Science CiNii Research

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：一般社団法人日本エネルギー学会共著

本研究では，固体酸化物形電解セル（Solid Oxide Electrolysis Cells: SOECs）の共電解形メタン－水素混合ガス製造システム（システムA）及び水蒸気電解形－水素混合ガス製造システム（システムB）を設計し，その効率と製造ガスの組成を計算した。システム効率（HHV）は，システムA：86.5％，システムB：84.9％となった。製造ガス組成については，システムA はメタン：74.1％，水素：24.8％，その他：1.1％，システムB はメタン：69.4％，水素：29.4％，その他：1.2％となった。製造ガスAおよびBの都市ガス13A への添加可能量は，それぞれ51.4％, 46.4％（発熱量制約の無い領域），5.5％, 5.0％（44～45 MJ/Nm3 の発熱量領域），13.8％, 12.5％（43～46 MJ/Nm3 の発熱量領域）となった。また，2030年の再生可能エネルギー導入予測量を用い，メタン－水素混合ガス製造システムで得られた製造ガスの都市ガス導管への供給可能量，再生可能エネルギー利用率及びCO2再資源化可能量を計算した。その結果，ガス製造可能量は，システムA：8.89 × 109 Nm3，システムB：9.09 × 109 Nm3と計算された。再生可能エネルギーを都市ガスとして利用する場合の再生可能エネルギー利用率は都市ガスの発熱量制限により異なるが，システムA：19. 6～19 6％，システムB：18 . 8～173％であった。 CO2再資源化可能量は12.4 ～13.0 Mt／年であり，この量は2013 年度の電気事業の2.57～2.68％のCO2に相当する。

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