Conceptual design of hydrogen production plant with thermochemical and electrolytic hybrid method using a sodium cooled reactor

Chikazawa, Yoshitaka  ; Hori, Toru*; Konomura, Mamoru; Hori, Toru*; Uchida, Shoji*

The thermochemical and electrolytic hybrid cycle is one of hydrogen production methods using sulfuric acid cycle. The maximum temperature in all of the processes is kept lower than 500C because electrolysis is partially utilized in the thermochemical process. In this study, a hydrogen production plant with the thermochemical and electrolytic hybrid cycle has been designed and the hydrogen production efficiency has been evaluated. In this design, components in hydrogen production system are designed to be made of steels such as high Si cast iron which has good toughness against sulfuric acid. High hydrogen production efficiency of 42% (high heating value) is achieved assuming development of high efficiency electrolysis.