高温水蒸気電解による水素製造(<特集>CO_2フリー水素製造技術の最新動向)

概要

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High-temperature steam electrolysis is one of the most promising methods for producing hydrogen and has the potential do so with high efficiency. Toshiba has been developing a high-temperature steam electrolysis system using solid-oxide cells for hydrogen production in a temperature range of 1073 to 1173K. A tubular cell was selected for development from the viewpoint of leak-tightness. An assembly unit consisting of 15 cells, whose hydrogen production rate design value is 100 Nl/h, was developed for a first-stage demonstration of large-scale hydrogen production. The hydrogen production rate of the unit was 130 Nl/h at an applied voltage of 1.4 V. From the results, it was confirmed that the unit, which consisted of cells, seals, electrical isolation, electricity supplies and so on, worked well. An analytical model to predict the thermal and electrochemical characteristics of the electrolysis cell was constructed. An electrode reaction model and an electrical conduction model were added to a computational fluid dynamics model. The efficiency of the high temperature steam electrolysis hydrogen production system that connected it with a nuclear reactor was evaluated. The system efficiency increases with the increase of the steam utilization in the solid oxide electrolysis cell or the decrease of the hydrogen recycle ratio.
一般社団法人日本エネルギー学会の論文
2009-05-20