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Report No.
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R&D progress in thermochemical water-splitting iodine-sulfur process at JAEA

Kubo, Shinji; Tanaka, Nobuyuki; Noguchi, Hiroki; Iwatsuki, Jin; Kasahara, Seiji; Imai, Yoshiyuki; Onuki, Kaoru

Thermochemical iodine-sulfur hydrogen production process is a promising application for the high temperature gas-cooled reactors. To realize this process, one of the key engineering tasks is proof of manufacturability of chemical reactors made of practical structural materials and confirmation of the reactors' sound performance in the harsh working conditions of the process. In order to examine the task, test apparatuses of the process are being constructed by JAEA. The Bunsen section has been built and assembled, the H$$_{2}$$SO$$_{4}$$ decomposer was recently manufactured, and the HI decomposer will be manufactured in FY2012. Throughput of the test apparatus is equivalent of a hydrogen production rate of 150 NL/h, and the design pressure is 0.95 MPa [abs]. The Bunsen reactor was assembled using corrosion resistant materials such as glass- and fluoroplastic-lined steels. The reactor is required to perform multiple functions of mixing the reactants and recycled substances, producing HI and H$$_{2}$$SO$$_{4}$$ by chemical reaction, carrying out heat removal, and separating products and gases. The reactor features an outer-circulating, co-current system to perform the said functions via a relatively simple mechanism. At first, performance of chemical reaction will be tested, followed by long-term service test of the reactors to demonstrate the durability of the construction materials. The results are expected to prove the promising engineering advances toward the practical use of Bunsen reactor that is a core device of this process.

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