Thermal Stress Analysis for a SOFC Testing Cell

固態氧化物燃料電池Cell Testing組件熱應力分析

江烈光(Lieh-Kwang Chiang) ； 黃昱先(Yu-Shian Huang) ； 李堅雄(Chien-Hsiung Lee) ； 李瑞益(Ruey-Yi Lee)

《中國機械工程學刊》 28卷5期 (2007/10) Pp. 533-539

https://doi.org/10.29979/JCSME.200710.0008

摘要

固態氧化物燃料電池(solid oxide fuel cell ,SOFC)屬於高溫型的燃料電池，目前已開發的SOFC系統其電池工作溫度範圍大都在650~1000℃，在高溫的運轉條件之下，SOFC各組件均會產生熱應力，其中陶瓷材料的電解質與電極最容易受熱應力影響造成裂縫，使得組件洩漏或破損，降低電池的效率，因此針對SOFC組件進行熱應力分析將是設計SOFC不可或缺的步驟。本研究係以核能研究所開發的平板式SOFC單元測試裝置(Cell testing)為研究對象，該單元測試裝置主要由Al2O3材料所製成之圓形氣體分流板，以及NiO/8YSZ/LSM材料之圓形電極組(Positive-Electrolyte-Negative, PEN)所組成。本文利用有限元素分析軟體MARC模擬分析不同操作電壓下其溫度場對熱應力之影響，而分析過程所需的溫度場則是由STAR-CD與es-SOFC軟體模擬分析所提供。模擬結果顯示，在操作電壓較低的條件下，因為溫度梯度較大，各組件會有較大的應力產生。

並列摘要

Solid Oxide Fuel Cell (SOFC) is operated at elevated temperatures of 650-1000℃. Under such high temperatures, several issues need to be overcome. Among then, the thermal stresses because of the mismatch of thermal expansion coefficients of components is one of the most important issue. The typical materials used for anode, electrolyte, and cathode in SOFC are all ceramic materials which are brittle and prone to fail due to excessive stresses. In this paper, a prototype SOFC single test cell, which consists of PEN, gas distributors and Air/Fuel pipings, is constructed. To analyze the thermal stress distribution of the test cell, the commercial code MARC is employed to carry out stress/thermal analysis. In the calculations, temperature field is provided by CFD code, STAR-CD and electrochemical module ES-SOFC. The analysis results will be offered to improve the cell/stack design.

並列關鍵字

Solid Oxide Fuel Cell SOFC ； Thermal stress