Study on structural design technique of silicon carbide applied for thermochemical hydrogen production IS process

Takegami, Hiroaki ; Ishikura, Shuichi*; Terada, Atsuhiko  ; Inagaki, Yoshiyuki

The IS process is the hydrogen production method which used the thermochemical reaction cycle of sulfuric acid and iodyne. The sulfuric acid decomposer, which is one of the important equipment of the IS process, is the equipment to heat with hot helium and for the sulfuric acid of 90 wt% to evaporate. The heat exchanger is required to be pressure-resistant structure because it uses high-pressure helium of 4 MPa, and the material is required to have heat resistance and corrosion resistance with high temperature sulfuric acid more than 700 C. Therefore, silicon carbide (SiC) was selected from the corrosion experiment as the most excellent material. However, the structure design technique of ceramics structures is not serviced as the standard. In this report, the structural design technique was studied by the material strength characteristic of the ceramics into consideration.