Abstract This article presents the experimental results of a novel Power-to-Gas (PtG) concept combining a pressurized high-temperature steam electrolysis (SOEC) and a CO2-methanation module in stand-alone and thermally integrated operation. For the electrolyser, steam conversion and energy demands at pressures up to 15 bar were examined. In terms of the methanation module, cooling performance, steam production and product gas quality were of main interest. Additionally, temperature profiles inside the fixed beds were gathered by a multipoint thermocouple at pressures up to 30 bar and load modulations from 20 to 100%. With less than 2 vol% H2 and over 97 vol% CH4 in the finally produced synthetic natural gas (SNG), it can be directly injected into the existing German natural gas grid without further gas cleaning and without capacity limitations. The achieved overall PtG efficiency of 76% is significantly higher than state of the art plants and has the potential to reach 80% in industrial scale.

中文翻译：

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通过高温蒸汽电解和二氧化碳甲烷化的热集成电转气 - 实验结果

摘要 本文介绍了一种新型电转气 (PtG) 概念的实验结果，该概念结合了加压高温蒸汽电解 (SOEC) 和 CO2 甲烷化模块，用于独立和热集成操作。对于电解槽，检查了压力高达 15 bar 时的蒸汽转化和能量需求。在甲烷化模块方面，冷却性能、蒸汽产量和产品气质量是主要关注点。此外，固定床内的温度分布由多点热电偶在高达 30 bar 的压力和 20% 至 100% 的负载调制下收集。最终生产的合成天然气 (SNG) 中 H2 少于 2 vol%，CH4 超过 97 vol%，可以直接注入现有的德国天然气管网，无需进一步的气体净化，也没有容量限制。