SOFC多尺度多場(chǎng)耦合和性能演化理論研究

林子敬

摘 要：針對(duì)本研究主攻一體化電池結(jié)構(gòu)SOFC和使用以甲烷為代表的碳基燃料的科學(xué)技術(shù)目標(biāo)，經(jīng)過對(duì)目前理論與模擬研究現(xiàn)狀的系統(tǒng)全面考慮，我們?cè)谘芯康那皟赡曛亻_展了一些必需的基礎(chǔ)理論和模擬研究，以彌補(bǔ)現(xiàn)狀的不足。本報(bào)告?zhèn)戎亟榻B本課題在如下方面開展的創(chuàng)新性理論研究與所取得的成果：（1）獲得精度與Dusty-gas Model精度相當(dāng)?shù)奈锓N流量解析表達(dá)式；（2）獲得能解釋實(shí)驗(yàn)結(jié)果的Ni顆粒生長理論模型；給出三相線長度隨Ni顆粒生長變化的理論關(guān)系；（3）獲得能解釋實(shí)驗(yàn)結(jié)果的多孔復(fù)合電極有效電導(dǎo)率理論模型；（4）建成微管SOFC多尺度多物理場(chǎng)耦合的二維模型；給出關(guān)鍵材料組分、微結(jié)構(gòu)和工作參數(shù)對(duì)微管SOFC性能的影響，指明可具有合理力學(xué)性能的材料組分、微結(jié)構(gòu)和工作參數(shù)。這些研究為后期的系統(tǒng)全面理論模擬研究奠定了良好基礎(chǔ)。

關(guān)鍵詞：多組分其他輸運(yùn) 鎳顆粒生長 電導(dǎo)率 納米浸漬電極 微管SOFC 機(jī)械強(qiáng)度

Abstract：The overall objective of our 973 program is to conduct basic research on solid oxide fuel cells （SOFCs） with nano-composite electrode structures and using methane fuel as a representative of general fossil fuel. Based on this objective and considering the deficiency of the available theory and modeling technique， we carried out the corresponding theory and modeling activities to fill the gap. This report summaries some of our key findings on the following topics： （1） Obtaining analytical decoupled expressions for the fluxes of multi-component gas species with accuracy comparable to the coupled Dusty-Gas Model； （2） Developing a theoretical model for the Ni agglomeration that is capable of explaining the experimental data. Moreover， using this model to establish the relationship between the TPB length and the growth of Ni particles； （3） Developing models for the effective electrical conductivities of nano-composite electrode and explaining the experimental data； （4） Building multi-scale and multi-physics numerical 2D model for micro-tubular SOFC. Based on this numerical tool， conducting simulation study on the effects of key material composition， microstructure and operating parameters on the performance of micro-tubular SOFC. The simulation results are used to identify the material composition， microstructure and operating parameters with desirable mechanical properties. The above results provide a solid basis for a systematical and thorough theoretical and modeling study in the future activity of the program.

Key Words：Multi-component gas transport；Agglomeration of Ni particle；Electrical conductivity；Nano-particle infiltrated electrode；Micro-tubular SOFC；Mechanical strength

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