At present, the source of hydrogen for commercial ammonia synthesis process are mainly obtained through methane reforming and coal gasification. To reduce fossil fuels consumption and CO2 emission, hydrogen production is a critical process in ammonia synthesis. Power-to-ammonia with solid-oxide electrolysis process can not only store renewable power (wind or solar), but also solve the problem of green hydrogen source. This research focuses on the techno-economic evaluation of the power-to-ammonia with solid-oxide electrolysis process. The results show that, the annual yield of ammonia is 50 kt with a purity of 99.8 mol%, with the storage capacity for renewable power being 360 GWh/year. SOEC case can achieve higher energy efficiency, the energetic efficiencies and production cost of the power-to-ammonia were 65% and 558 $/ton, respectively.
Keywords Power-to-ammonia, Hydrogen storage, Solid-oxide electrolyzer, heat integration, multi-objective optimization