成果報告書詳細
管理番号20120000000657
タイトル*平成23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 円筒形SOFC複合発電システム高効率化・信頼性向上のための研究開発
公開日2015/11/21
報告書年度2011 - 2011
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
英文要約Abstract
In this project, research and development of tubular type SOFC cell-stacks, modules and combined cycle systems with micro gas turbine (MGT) is conducted for improvement of reliability, 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) Improvement of Redox robustness of tubular type cell-stack
In order to improve reduction-oxidation (Redox) robustness of tubular type cell-stack, the density of inter-connector was increased by controlling the sintering characteristics, and the anode material with high electrical conductivity of less expansion in re-oxidation is adopted. As the result, a cell stack applying the improved inter-connector obtained double purge tolerance by N2 at 1173 K than that of conventional inter-connector.
(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
Electrochemical performance of the cell-stack at 2MPa-a was estimated using experimental data of lower pressure condition. As the result, it was expected that the operating cell voltage increases approximately 12% than that of atmospheric pressure. Heat transfer and temperature distribution at 2MPa-a in the cartridge 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
In order to develop a compact module, the packing density of the cell stack was increased from 400 to 700 stack/m2. A SOFC module of high packing density was re-designed to homogenize temperature and flow distribution for pressurized operation. The improved SOFC cartridge was manufactured and tested. The generation performance of improved cartridge is roughly comparable to that of conventional type module, and the temperature distribution is also roughly agreement of simulation result.
(2) Simplification of SOFC-MGT combined cycle system and the design of demonstration equipment of 250 kW class system
In order to design a simpler and more compact system, operation tests using conventional system were conducted not use any part of the existing equipments and control valves. Based on the results, we designed a system of demonstration equipment of 250kW class SOFC-MGT hybrid power system. 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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