Novel power-to-syngas concept for plasma catalytic reforming coupled with water electrolysis

作者：Li, Kai; Liu, Jing-Lin; Li, Xiao-Song; Lian, Hao-Yu; Zhu, Xiaobing^*; Bogaerts, Annemie^*; Zhu, Ai-Min^*

来源：Chemical Engineering Journal, 2018, 353: 297-304.

DOI：10.1016/j.cej.2018.07.111

• Plasma catalysis
• Plasma catalytic reforming
• Power-to-syngas
• Renewable energy

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/Nm(3) 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/Nm(3). 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 O-2 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.

• 出版日期2018-12-1
• 单位大连理工大学