We propose a novel Power to Synthesis Gas (P2SG) approach, composed of two high-efficiency and renewable electricity-driven units, i.e., plasma catalytic reforming (PCR) and water electrolysis (WE), to produce high-quality syngas from CH₄, CO₂ and H₂O. As WE technology is already commercial, we mainly focus on the PCR unit, consisting of gliding arc plasma and Ni-based catalyst, for oxidative dry reforming of methane. An energy efficiency of 78.9% and energy cost of 1.0 kWh/Nm³ at a CH₄ conversion of 99% and a CO₂ conversion of 79% are obtained. Considering an energy efficiency of 80% for WE, the P2SG system yields an overall energy efficiency of 79.3% and energy cost of 1.8 kWh/Nm³. High-quality syngas is produced without the need for post-treatment units, featuring the ideal stoichiometric number of 2, with concentration of 94.6 vol%, and a desired CO₂ fraction of 1.9 vol% for methanol synthesis. The PCR unit has the advantage of fast response to adapting to fluctuation of renewable electricity, avoiding local hot spots in the catalyst bed and coking, in contrast to conventional catalytic processes. Moreover, pure O₂ from the WE unit is directly utilized by the PCR unit for oxidative dry reforming of methane, and thus, no air separation unit, like in conventional processes, is required. This work demonstrates the viability of the P2SG approach for large-scale energy storage of renewable electricity via electricity-to-fuel conversion.

我们提出了一种新型的合成气发电（P2SG）方法，该方法由两个高效且可再生的电力驱动单元（即等离子催化重整（PCR）和水电解（WE））组成，以从CH ₄生产高质量的合成气，CO ₂和H ₂ O.正如我们技术已经商业，我们主要集中的PCR单元上，由滑动弧等离子体和基于Ni的催化剂，用于氧化干燥甲烷重整的。在CH ₄转化率为99％，CO ₂转化率为79％的情况下，获得了78.9％的能量效率和1.0 kWh / Nm ^3的能量成本。考虑到WE的能源效率为80％，P2SG系统的整体能源效率为79.3％，能源成本为1.8 kWh / Nm³。无需后处理单元即可生产高质量的合成气，其特征在于理想的化学计量数为2，浓度为94.6 vol％，而甲醇合成所需的CO ₂分数为1.9 vol％。与传统的催化方法相比，PCR装置的优势是对适应可再生电力的波动具有快速响应的优势，避免了催化剂床层和焦化过程中的局部热点。此外，来自WE单元的纯O ₂被PCR单元直接用于甲烷的氧化干重整，因此，不需要像常规方法中那样的空气分离单元。这项工作证明了P2SG方法通过电力到燃料的转换来大规模存储可再生电力的可行性。