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Impact of voltage degradation in water electrolyzers on sustainability of synthetic natural gas production: Energy, economic, and environmental analysis
Energy Conversion and Management ( IF 9.9 ) Pub Date : 2021-07-24 , DOI: 10.1016/j.enconman.2021.114516
Dongjun Lim 1 , Boreum Lee 1 , Hyunjun Lee 1 , Manhee Byun 1 , Hyun-Seok Cho 2 , Wonchul Cho 2 , Chang-Hee Kim 2 , Boris Brigljević 1 , Hankwon Lim 1, 3
Affiliation  

Synthetic natural gas (SNG) production from captured CO2 and H2 produced by water electrolysis using renewable energy is of increasing interest for low-carbon fuel production, CO2 utilization technology, and unstable renewable energy storage. In this study, the effect of voltage degradation in a water electrolyzer, a core technology for SNG production, on the unit production cost of SNG production and CO2 emissions, with different water electrolysis types such as alkaline electrolysis (AEL), proton exchange membrane electrolysis (PEMEL), and solid oxide electrolysis (SOEL), was identified through techno-economic and environmental assessment. In particular, the energy efficiency, unit production cost of SNG, and CO2 emissions were identified based on the change in the power consumption caused by voltage degradation. Moderate voltage loss results in a decrease in energy efficiency from 53.8% to 48.8% in AEL, 55.3% to 47.0% in PEMEL, and 76.3% to 51.2% in SOEL. Moreover, respective SNG unit production costs of 140.3–170.2 USD MWh−1, 157.5–203.1 USD MWh−1, and 153.1–353.5 USD MWh−1 for AEL, PEMEL, and SOEL, respectively, were obtained, showing an increase in SNG production cost due to the voltage degradation. Furthermore, total CO2 emissions for the SNG production process were investigated considering voltage degradation as well as electricity generation sources.



中文翻译:

水电解槽电压下降对合成天然气生产可持续性的影响:能源、经济和环境分析

使用可再生能源通过水电解产生的捕获的 CO 2和 H 2生产合成天然气 (SNG) 在低碳燃料生产、CO 2利用技术和不稳定的可再生能源存储方面越来越受到关注。在本研究中,使用碱性电解 (AEL)、质子交换膜等不同水电解类型,作为SNG 生产核心技术的水电解槽中的电压退化对 SNG 生产的单位生产成本和 CO 2排放的影响通过技术经济和环境评估确定电解(PEMEL)和固体氧化物电解(SOEL)。特别是能源效率、SNG 的单位生产成本和 CO 2排放是根据电压下降引起的功耗变化来确定的。适度的电压损失导致能量效率从 AEL 的 53.8% 降至 48.8%、PEMEL 的 55.3% 至 47.0% 和 SOEL 的 76.3% 至 51.2%。此外,AEL、PEMEL 和 SOEL 分别获得了 140.3-170.2 美元 MWh -1、157.5-203.1 美元 MWh -1和 153.1-353.5 美元 MWh -1 的SNG 单位生产成本,显示 SNG 增加因电压劣化导致的生产成本。此外,考虑到电压退化和发电源,研究了 SNG 生产过程的CO 2总排放量。

更新日期:2021-07-24
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