Abstract
Iodine-sulfur (IS or S_I) process has been researched as one of the promising thermochemical hydrogen production methods. Process design based on heat/mass balance through the process considering the operation conditions and apparatus properties is important for an effective hydrogen production. In this study, preliminary analysis of the total IS process was carried out. Sensitivity of parameters in H2SO4 decomposition and in HI decomposition procedure was discussed by total thermal efficiency. Temperature difference at heat exchangers in the HI decomposition procedure changed thermal efficiency by 3.0 %. Thermal efficiency was improved by 1.4-2.5 % for one stage in the multi-stage H2SO4 evaporator. Heat exchange in the H2SO4 decomposition procedure should be optimized to obtain optimum thermal efficiency. HI concentration after the electro-electrodialysis cell for HI concentration changed thermal efficiency by 13.9 %. Effect of HI one-pass conversion rate at HI decomposition membrane reactor was about 1 %. The most important parameter in the IS process was HI concentration after the EED.
