成果報告書詳細
管理番号20160000000191
タイトル*平成27年度中間年報 水素利用等先導研究開発事業 高効率水素製造技術の研究 高温水蒸気電解システムの研究
公開日2016/12/20
報告書年度2015 - 2015
委託先名株式会社東芝
プロジェクト番号P14021
部署名新エネルギー部
和文要約
英文要約Title : Leading Research and Development Program for Hydrogen Utilization etc / Study of Highly Efficient Hydrogen Production Technology / Study of High-Temperature Steam Electrolysis System (FY2014-FY2017) FY2015 Annual Report

One of the important features of the high-temperature steam electrolysis method is that the heat can be used for electrolysis energy in addition to the electricity in a practical way. Consequently, it improves the efficiency of the hydrogen production compared with the alkaline or the solid polymer membrane electrolysis methods. Furthermore, there is a possibility to establish the highly efficient charge-discharge power storage system, by adopting the high-temperature steam electrolysis and the solid oxide fuel cell electric generation with the cyclic heat usage in the system. The purpose of this study is to demonstrate the high efficiency for the high-temperature electrolysis adopting systems. The cell and the cell-stack technologies, the hydrogen production system and the power storage system are studied.
(1) Cell and cell-stack technology development / Based on the results until the FY2014 development, the stack manifold was improved, and then the first type full-stack was developed. The full-stack showed the better I-V property against the target property of over 0.5 A/cm2 at 1.3 V for a cell, under the steam utilization over 70%. And the endothermic reaction is observed corresponding to the current density as theologically expected.
(2) Hydrogen production system / Based on the results until the FY2014 development, a multi-stack test equipment was produced for investigating the electrolysis property, the structural soundness and the operation controlling ability. For the test of 4 full-stacks with series circuit, the I-V properties and the heat absorption and generation properties were evaluated. The full-stacks showed the target I-V properties of over 0.5 A/cm2 at 1.3 V, and their degree of temperature change behavior according to the current density increase was recognized. In parallel, design study of the 150kW-class hydrogen production system was progressed. The latest I-V property and the pressure loss property of the stack were applied for designing the high-temperature module. The compact design of the system was studied from the aspect of the transporting and the assembling capabilities.
(3) Power storage system / Based on the results until the FY2014 development, the design study for the system using the high-temperature heat storage equipment was progressed. It revealed that the decrease of the operation power of the air compressor was considerably effective to improve the system efficiency. So to employ the radiation heat transfer in the high-temperature heat storage is investigated. Also the material and the structure of the heat storage cell were studied.
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