成果報告書詳細
管理番号20110000001682
タイトル*平成20年度中間年報 固体酸化物形燃料電池システム要素技術開発 実用性向上のための技術開発 運用性向上のための起動停止技術開発
公開日2011/11/9
報告書年度2008 - 2008
委託先名TOTO株式会社
プロジェクト番号P08004
部署名燃料電池・水素技術開発部
和文要約和文要約等以下本編抜粋:研究開発の内容及び成果等
1.1 目的
固体酸化物形燃料電池(以下SOFCと表記)は高い発電効率に加えシンプルな発電システムを構築することができ、高効率な分散型電源として期待されている。これまでは、SOFCは起動に大きなエネルギーが必要であることから、起動停止や大きな負荷変動を伴わないベースロード負荷に対する運転に好適とされ、定負荷連続運転における性能評価が中心であった。しかし実用的にはSOFCシステムのライフサイクルにおいて多数の起動停止を避けることはできない。
 本開発では、熱衝撃の影響を受けにくいスタック・モジュール構造の開発を実施し、実運転下で想定される起動停止モードである冷起動停止(Cold Start-up and Stop ⇒CSS)および暖起動停止(Hot Stand-by and Start-up ⇒HSS)条件を構築させる。熱衝撃に優れるモジュールで上記構築した起動停止運転条件を合計50回程度実施し、起動停止250回でスタックの電位低下率が10%以下を見通すことを中間評価までの目標とする。
英文要約Title : Development of System and Elemental Technology on SOFC / Technological development for improving practical utility / Stop-start technology for improving operation at TOTO
SOFCs are expected highly efficient dispersed generation for high electric efficiency and having the possibility to structure simple generation system. In the past, SOFCs were regarded the operation without start-up and stop and rapid loading variety as suitable operation and performance evaluation of SOFCs had been mainly made base loading operation. But SOFC systems under practical environments will be inevitable to a lot of start-up and stop operation as long as the long-term operation (more than 40,000hr) is been demanded.
In this project, development of robust SOFC stack and module structure against thermal shock is carried out and cold start-up and stop (CSS) condition and hot stand-by and start-up (HSS) one are developed. The objective until middle evaluation which will be held in the middle of fiscal 2010 is to foresee less than 10% of voltage degradation-rate at 250 times under the developed start-up and stop condition by implementing around 50 times under the above-mentioned start-up and stop condition with the above-developed module.
In order to develop robust SOFC stack and module structure against thermal shock, some stack structures surrounded by some metal frames were proposed and those performances were evaluated. The performances of each stacks were screened by accelerating CSS condition. As a result, some of the proposed stacks were shown good performance and one of the stacks was continued 17time-trial of the accelerating CSS condition. It was regarded that its performance would be reached successful level. The stack structure will be adopted in upcoming year-tests and developed practical CSS and HSS condition. On the other hand, the degradation rate of the above-mentioned stack tended to get worse rapidly after 11 time-test. It was worried a little about start-up and stop character. So its degradation factor will be investigated and a part of structure of the above-mentioned stack will be improved in next year.
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