本文選題：固體氧化物燃料電池　切入點：3D電堆　出處：《江蘇科技大學(xué)》2017年碩士論文

【摘要】：固體氧化物燃料電池(SOFC)是具應(yīng)用前景的電能產(chǎn)生裝置之一。由于SOFC有著復(fù)雜的工作過程,相比于傳統(tǒng)實驗方法,模擬仿真的方法會更有優(yōu)勢。SOFC在運作時會有各種復(fù)雜的反應(yīng)過程,包括流動、電化學(xué)、傳熱傳質(zhì)及導(dǎo)電等。電化學(xué)反應(yīng)過程中反應(yīng)物的生成及消耗會影響到SOFC內(nèi)的熱量的分布、流動以及整個電堆的性能。所以本論文以寧波材料所的新型平板式短堆的結(jié)構(gòu)為原型,實施了電堆的3D模型建立,對電堆進(jìn)行了優(yōu)化及分析。并試著建立了3D電堆的全模型(主管道、陽極、陰極、電解質(zhì)及連接體),包括傳熱和傳質(zhì)、流動以及化學(xué)反應(yīng)等的綜合性多場耦合的全模型。主要研究內(nèi)容和結(jié)論如下:1、首先介紹了10層小型電堆流場優(yōu)化背景以及關(guān)于電堆模型用到的一些理論和具體的優(yōu)化步驟,第一部分的重點就是對氫氣和空氣流場均勻度和標(biāo)準(zhǔn)偏差因子的計算,利用計算流體動力學(xué)(CFD)對模塊化電堆內(nèi)不同主管道的位置及不同分流器下的氣流分布情況進(jìn)行了對比分析。2、針對10層電堆的流場分析,有以下結(jié)論:(1)主管是否穿透SOFC單元平面不會影響電堆層面的電池單元中的燃料和空氣流分布質(zhì)量。對于小型平板式SOFC電堆,在電堆層面的流量分布質(zhì)量很高。然而,每個SOFC單元表面的流量分布質(zhì)量應(yīng)該加以改善;(2)當(dāng)燃料主管置于SOFC單元區(qū)域內(nèi)并穿過SOFC單元區(qū)域時,超過31%的空氣將通過燃料主管區(qū)域的半圓區(qū)域;(3)當(dāng)空氣流主管放置在SOFC單元區(qū)域內(nèi)時,超過14%的燃料將通過空氣主管區(qū)域的半圓區(qū)域;(4)當(dāng)流量主管穿過電池單元平面時,通過增加額外的分配器或擴(kuò)大整個出口主管面積,單電池層面上的燃料和空氣流分布質(zhì)量并不會大大改善。3、針對25層帶有多孔介質(zhì)的模塊化短堆進(jìn)行了分流器的優(yōu)化以及進(jìn)出口排列的優(yōu)化分析,對于空氣側(cè)模型,包括了空氣氣道、陰極支撐層、陰極以及電解質(zhì);對于燃料模型,包括了燃料氣道、電解質(zhì)、陽極支撐層、陽極,加入了流動、熱量以及組分傳輸?shù)鹊挠绊?通過優(yōu)化的結(jié)果分析電堆里的流場分布以及溫度和組分的分布情況,最終得出半圓分流器結(jié)構(gòu)改善了原始結(jié)構(gòu)流場及溫度場分布的均勻性,而1進(jìn)2出結(jié)構(gòu)只優(yōu)化了燃料側(cè)流量分布的均勻性,其余的溫度分布及空氣側(cè)的流量及溫度分布都沒有得到改善,所以得出采用半圓分流器結(jié)構(gòu)更能增加電堆系統(tǒng)的使用壽命,降低維修及應(yīng)用的成本,能很有效的幫助SOFC的商業(yè)化發(fā)展。
[Abstract]:Solid oxide fuel cell (SOFC) is one of the promising power generation devices. Because of the complex working process of SOFC, compared with the traditional experimental methods, There are many complex reaction processes in the operation of SOFC, including flow, electrochemistry, heat and mass transfer and conduction, etc. The generation and consumption of reactants during electrochemical reaction will affect the distribution of heat in SOFC. Flow and the performance of the whole stack. Therefore, based on the structure of the new type flat short reactor of Ningbo Institute of Materials, the 3D model of the stack is established in this paper. The whole model of 3D stack (main pipe, anode, cathode, electrolytes and connectors, including heat and mass transfer) has been established. The main contents and conclusions of the study are as follows: 1. Firstly, the background of flow field optimization and some theories and specific optimization steps used in the stack model are introduced. The first part focuses on the calculation of the uniformity of hydrogen and air flow field and the standard deviation factor. By using computational fluid dynamics (CFD), the airflow distribution of different main pipeline and different shunt in modularized electric reactor is compared and analyzed, and the flow field of 10 layer reactor is analyzed. The following is the conclusion: 1) whether or not the supervisor penetrates the plane of the SOFC cell does not affect the quality of the fuel and air flow distribution in the battery cell at the stack level. For the small flat SOFC stack, the flow distribution quality at the stack level is very high. However, The quality of flow distribution on the surface of each SOFC cell should be improved when the fuel supervisor is placed in the SOFC cell area and passes through the SOFC cell area, More than 31% of the air will pass through the semicircular area of the fuel charge area.) when the air flow supervisor is placed in the SOFC cell area, more than 14% of the fuel will pass through the semicircular area of the air competent area. By adding additional allocators or expanding the entire export control area, The mass distribution of fuel and air flow on the single cell layer will not be greatly improved. For the 25 layers of modularized short reactor with porous media, the optimization of the shunt and the optimal arrangement of the inlet and outlet are carried out. For the air side model, Including air passage, cathode support layer, cathode and electrolyte; for fuel model, including fuel channel, electrolyte, anode support layer, anode, the effect of adding flow, heat and component transmission, etc. By analyzing the distribution of flow field and temperature and components in the stack, it is concluded that the semi-circular shunt structure improves the uniformity of the flow field and temperature field of the original structure. However, the 1 in 2 output structure only optimizes the uniformity of flow distribution on the fuel side, while the other temperature distribution and the flow rate and temperature distribution on the air side are not improved, so it is concluded that the semi-circular shunt structure can increase the service life of the stack system. Reduce the cost of maintenance and application, can help the commercialization of SOFC very effectively.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM911.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 陸國;;探討中國新能源現(xiàn)狀及發(fā)展趨勢[J];經(jīng)營管理者;2014年18期

2 王瀟;田玉冬;;關(guān)于新能源汽車的動力能源使用分析[J];汽車電器;2014年05期

3 吳忻;燃料電池及其發(fā)展概況[J];動力工程;2001年02期

相關(guān)博士學(xué)位論文 前4條

1 孔為;固體氧化物燃料電池和磁控濺射陰極的理論分析與優(yōu)化設(shè)計[D];中國科學(xué)技術(shù)大學(xué);2012年

2 陳代芬;固體氧化物燃料電池性能的微結(jié)構(gòu)理論與多尺度多物理場模擬[D];中國科學(xué)技術(shù)大學(xué);2010年

3 畢武喜;平板式固體氧化物燃料電池氣道模擬與優(yōu)化[D];中國科學(xué)技術(shù)大學(xué);2009年

4 楊云珍;含功能梯度立體電極SOFC熱流電化學(xué)力學(xué)耦合數(shù)值模擬[D];華中科技大學(xué);2008年

相關(guān)碩士學(xué)位論文 前1條

1 曾啟策;固體氧化物燃料電池模塊化短堆流場模擬與結(jié)構(gòu)優(yōu)化[D];江蘇科技大學(xué);2013年

，

本文編號：1666547