Power-to-gas (PtG) is a promising technology for the production of hydrogen via electrochemical reactions in water electrolyzers to manage intermittent power generation from renewable energy sources, such as wind and solar energy. Water electrolyzers generate hydrogen and highly purified oxygen as by-products. In this study, process analysis was performed on oxy-fuel combustion in a coal and biomass power plant and a PtG plant, which uses highly purified oxygen obtained from a water electrolyzer. The power-generation efficiency of an oxy-fuel power plant supplied with oxygen through an air separation unit and that of an oxy-fuel power plant supplied with oxygen in a polymer electrolyte membrane (PEM) water electrolysis process were also compared. Furthermore, we analyzed a combined system comprising an oxy-fuel power plant and PtG plant and found the resulting net power generation and power-generation efficiency to be higher than those of the individual oxy-fuel power plant that was supplied with oxygen through an air separation unit. This process efficiency was further improved when applying biomass to fuel the oxy-fuel combustion boiler rather than coal, and in cases where the steam-water is in a supercritical condition. Comparing with other methods, power generation using biomass is environment-friendly and sustainable. Finally, an economic analysis of hydrogen production showed that the levelized hydrogen cost was deduced to approximately $3.67/kg-H₂, which is similar to the 2030 target value for hydrogen economy revitalization roadmap of the Korean government of 4000 KRW/kg-H₂.

电转气 (PtG) 是一种很有前途的技术，它通过水电解槽中的电化学反应生产氢气，以管理风能和太阳能等可再生能源的间歇性发电。水电解槽产生氢气和高纯度氧气作为副产品。在这项研究中，对煤和生物质发电厂以及 PtG 工厂中的氧燃料燃烧进行了过程分析，该工厂使用从水电解槽中获得的高纯度氧气。还比较了通过空气分离装置供应氧气的富氧燃料发电厂和通过聚合物电解质膜 (PEM) 水电解过程供应氧气的富氧燃料发电厂的发电效率。此外，我们分析了一个由氧燃料发电厂和 PtG 设备组成的组合系统，发现由此产生的净发电量和发电效率高于通过空气分离装置供应氧气的单个氧燃料发电厂的净发电和发电效率. 当使用生物质而不是煤为氧燃料燃烧锅炉提供燃料时，以及在蒸汽-水处于超临界条件的情况下，这种工艺效率得到进一步提高。与其他方法相比，使用生物质发电是环保和可持续的。最后，对氢气生产的经济分析表明，平均氢气成本推算为约 3.67 美元/kg-H 与其他方法相比，使用生物质发电是环保和可持续的。最后，对氢气生产的经济分析表明，平均氢气成本推算为约 3.67 美元/kg-H 与其他方法相比，使用生物质发电是环保和可持续的。最后，对氢气生产的经济分析表明，平均氢气成本推算为约 3.67 美元/kg-H₂，这与韩国政府氢经济振兴路线图的2030年目标值4000 KRW/kg-H ₂相似。