Process flow analysis for hydrogen iodide decomposition section in thermochemical water-splitting IS process

Ohashi, Hirofumi ; Sakaba, Nariaki ; Kubo, Shinji  ; Imai, Yoshiyuki  ; Kato, Ryoma*; Kunitomi, Kazuhiko 

JAEA has been developing the hydrogen production system by the thermo-chemical water splitting Iodine-Sulfur (IS) process to produce large amount of hydrogen with the HTGR. In order to increase the HI decomposition rate, alternative multistage HI decomposition process was proposed. It consists of a decomposition section and an iodine removal section, in which iodine is removed from produced gaseous mixture by using HI solution in the process. From the heat and mass balance evaluation, it was confirmed that the decomposition rate increased from 23% of conventional process to 40% by using the multistage decomposition process with 5-stage.