成果報告書詳細
管理番号20110000000952
タイトル*平成22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 超効率運転のための高圧運転技術
公開日2011/10/12
報告書年度2010 - 2010
委託先名三菱重工業株式会社
プロジェクト番号P08004
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:1.概要
1.1 研究目的
固体酸化物形燃料電池(SOFC)はガスタービン複合発電と組み合わせることにより、極めて高い効率を実現することができる。数百MW 級の火力発電用の天然ガス焚きガスタービン複合発電システムとの複合発電システムとして発電効率70%(LHV)以上、数百から数千kW 級の中小規模のSOFC-マイクロガスタービンハイブリッドシステムとして発電効率55%(LHV)以上の発電システムが構成できる。
当社では、平成16~19 年度の委託研究「円筒形SOFC コンバインドサイクルシステムの開発」にて、200kW 級のSOFC-マイクロガスタービンコンバインドサイクルの検証運転を実施し、200kW以上にて発電効率52%(LHV、送電端)を確認し、SOFC を用いた高効率発電システムへの第一歩を踏み出したが、実用化に向けた信頼性向上等の課題も明らかになった。また、平成17~19 年度の委託研究「高出力密度化に関する研究開発」で、実用化に向けた高出力・低コストセルスタックの開発を実施した。
本事業では、これまでの研究開発で明らかになった課題を解決し、更に高効率のSOFC 複合発電システムを実用化することを目的とする。
英文要約Abstract
In this project, research and development of tubular type SOFC cell-stack, module and combined cycle system with
micro gas turbine (MGT) is done for improvement of reliability, efficiency, compactness and elevated pressure operation
technology of SOFC-gas turbine combined cycle system with very high efficiency.
1. R&D for improvement of reliability of SOFC module and combined cycle system
(1) a. Improvement of REDOX robustness of tubular type cell-stack
In order to improve REDOX robustness of tubular type cell-stack, Ni-YSZ cermet with both smaller expansion rate at re-oxidization and sufficient electronic conductivity is adopted for anode material. Density of interconnect was raised by
with adjustment of sintering condition. Cell-stacks with above improvement were manufactured and tested as a cartridge consist of around 50 cell-stack. Cell-stacks and a cartridge were not damaged without reduced gas supply to anode at
elevated temperature over 750 deg-C during hours, and REDOX robustness was improved.
(1) b. Improvement of differential pressure resistance of tubular type cell-stack and cartridge
Provided for elevated pressure operation, response against higher differential pressure between anode and cathode was
tested using a cartridge consist of around 50 cell-stacks. No damage was observed after loading 3kPa differential
pressure.
(2) Improvement of reliability of SOFC-MGT combined cycle system
For improvement of reliability of SOFC-MGT combined cycle system, requirements for SOFC and MGT protection were
studied. Based on the results, improved interlock logic for SOFC and MGT protection was installed in control system.
Operation test of SOFC-MGT combined cycle system was executed. The result shows the protection system works well during start-up, load operation, usual shutdown and emergency shutdown. No damage was observed
(3) Fundamental study of cell-stacks for elevated pressure operation
Performance of cell-stack at elevated pressure to 2MPa-a was estimated using experimental data at lower pressure
condition. At 2 MPa-a cell-voltage rises around 12% compared with that at atmospheric pressure. Heat transfer and
temperature distribution at 2MPa-a was estimated by numerical analysis, resulted enough heat transfer and good
temperature distribution at 2 MPa-a condition.
2. R&D for elevated pressure operation of SOFC module and combined cycle system
(1) Improvement of compactness of SOFC module for elevated pressure operation
For improvement of compactness of SOFC module, dense arrangement of cell-stacks in module was designed and
manufactured using improved cell-stacks. Operation test was executed. Temperature distribution was nearly the same as predicted by numerical analysis, then power generation characteristics was equivalent to conventional cartridge.
(2) Simplification of SOFC-MGT combined cycle system
In order to plan more simple and compact system, test operations not to use some existing auxiliary equipments and
control valves that were considered to be omitted. Based on the experimental results, an advanced 250kW-class SOFC-MGT combined cycle system was planned. It’s expected efficiency is over 55%LHV-net, and it’s footprint is around
70m2, that is a half footprint of the 200kW-class system manufactured in former project.
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