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熱化学水素製造法ISプロセスのための硫酸分解器の開発

Development of sulfuric acid decomposer for thermochemical hydrogen production IS process

寺田 敦彦; 大田 裕之; 野口 弘喜; 小貫 薫; 日野 竜太郎

Terada, Atsuhiko; Ota, Hiroyuki; Noguchi, Hiroki; Onuki, Kaoru; Hino, Ryutaro

日本原子力研究開発機構では、高温ガス炉(HTTR)を用いた熱化学ISプロセスによる水素製造技術の開発を進めている。硫酸分解器は、濃硫酸を高温のヘリウムガスとの熱交換により蒸発・分解するためのISプロセス機器である。本報では、セラミックスブロック型硫酸分解器について、ブロックの強度評価と試作、及びブロックと金属フランジ間等のシール性能試験等を実施し、構造成立性に目処を得た。

The Japan Atomic Energy Agency has been conducting R&D on high-temperature gas-cooled reactor (HTGR) technology and also on thermo-chemical water splitting hydrogen production technology by using an iodine-sulfur cycle (IS process) in the high temperature engineering test reactor (HTTR) project. The sulfuric acid (H$$_{2}$$SO$$_{4}$$) decomposer is one of the key equipments in the IS process, in which concentrated sulfuric acid is evaporated and decomposed into SO$$_{3}$$ and H$$_{2}$$O with the heat of high temperature helium gas supplied by HTGR. A concept of the decomposer consisting of multi-block-type heat exchanger made of SiC ceramics was proposed, and its feasibility was examined by preliminary analyses of thermal-hydraulic and structural strength and test-fabrication of SiC block components as well as elementary tests of seal performance in SiC blocks and metal flanges.

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