本文選題：堆疊型微生物燃料電池　切入點(diǎn)：歐姆阻力　出處：《武漢科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：微生物燃料電池（Microbial Fuel Cell，MFC）能夠利用微生物的催化作用，將污水中有機(jī)物的化學(xué)能直接轉(zhuǎn)化為電能，是一種集污水處理和能源回收為一體的創(chuàng)新性技術(shù)。 本研究以放大的填料電極微生物燃料電池（L-MFC）的歐姆阻力分析和內(nèi)部流態(tài)分析為基礎(chǔ)，設(shè)計(jì)出堆疊型填料電極MFC的放大裝置（總凈容積72L），并對(duì)其各方面性能進(jìn)行研究和分析，旨在促進(jìn)微生物燃料電池的工程化放大應(yīng)用。 研究結(jié)果表明： （1）鈦網(wǎng)由于表面氧化膜的影響會(huì)導(dǎo)致其導(dǎo)電性下降；0.45mm×20目的鈦網(wǎng)與電極的接觸面積最小，接觸電阻最��；并聯(lián)集電時(shí)的L-MFC的產(chǎn)電效果最好，最大功率密度達(dá)到了34.62W/m3；L-MFC的歐姆阻力中，電子傳導(dǎo)阻力一般大于離子遷移阻力，其主要來源是集電材料與電極的接觸阻力。 （2）L-MFC的實(shí)際水力停留時(shí)間普遍大于理論停留時(shí)間，，二者之間的差異是由于理論值采用定值孔隙率得到，而L-MFC電極孔隙間的傳質(zhì)并不是均勻分布的；L-MFC的內(nèi)部流態(tài)屬于介于平推流和完全混合流之間的多孔介質(zhì)的非均勻流態(tài)，并且進(jìn)水流量越大，水流的混合流動(dòng)程度越小，流態(tài)越接近平推流。 （3）堆疊型L-MFC啟動(dòng)階段的總內(nèi)阻約為0.19；并聯(lián)供電、三電阻單獨(dú)供電和五電阻單獨(dú)供電時(shí)的最大功率密度分別為47.25W/m3、30.55W/m3和50.45W/m3，每個(gè)MFC單元獨(dú)立供電時(shí)堆疊型L-MFC的產(chǎn)電效率最高。并聯(lián)供電時(shí)，各陰極或陽極之間易出現(xiàn)“內(nèi)電流”，導(dǎo)致MFC單元的極性反轉(zhuǎn)，并且外阻越大，越容易出現(xiàn)反極現(xiàn)象。 （4）堆疊型L-MFC的最大功率密度隨著進(jìn)水COD濃度的提高而增大，在處理高濃度或低濃度COD污水時(shí)，獨(dú)立供電時(shí)的產(chǎn)電性能優(yōu)勢(shì)更明顯。在連續(xù)流運(yùn)行模式下，獨(dú)立供電時(shí)MFC的庫侖效率普遍高于并聯(lián)供電的，而COD去除負(fù)荷相差不大。此外，通過測(cè)試每個(gè)腔體水頭損失的方法可以得知各極室的電極堵塞狀況，及時(shí)疏通換水能夠使MFC的輸出電壓得到恢復(fù)。
[Abstract]:Microbial Fuel cell (MFCs) can directly convert the chemical energy of organic matter into electric energy by using the catalytic action of microorganisms. It is an innovative technology which integrates wastewater treatment and energy recovery. Based on the ohmic resistance analysis and internal flow state analysis of packed electrode microorganism fuel cell (L-MFC), a MFC amplification device with stacked packed electrode (total net volume 72L ~ (-1)) was designed, and its various properties were studied and analyzed. The purpose of this paper is to promote the engineering application of microbial fuel cells. The results show that:. (1) because of the influence of oxide film on the surface of titanium mesh, the electric conductivity of titanium mesh will decrease by 0.45mm 脳 20. The contact area between titanium mesh and electrode is the smallest and the contact resistance is the smallest. The L-MFC with parallel current collection has the best power generation effect, and the maximum power density reaches 34.62W / m ~ (3) m ~ (3) L 路M ~ (-1) of ohmic resistance of L-MFC. The resistance of electron conduction is generally greater than that of ion migration, and the main source is the contact resistance between the collector and the electrode. The actual hydraulic retention time of L-MFC is generally larger than that of theoretical residence time, and the difference between them is due to the fact that the theoretical value is obtained by using constant porosity. However, the mass transfer between the pores of L-MFC electrode is not uniformly distributed. The internal flow state of L-MFC belongs to the non-uniform flow state of porous media between flat push flow and complete mixed flow, and the greater the influent flow is, the smaller the mixing flow degree of water flow is. The flow pattern is closer to the flat thrust flow. The total internal resistance of stacked L-MFC at startup stage is about 0.19. The maximum power density of three resistors and five resistors are 47.25 W / m ~ 3 and 50.45 W / m ~ 3, respectively. When each MFC unit is supplied independently, the power generation efficiency of stacked L-MFC is the highest. The "internal current" between the cathodes and anodes is easy to appear, which leads to the reversal of the polarity of the MFC cells, and the larger the external resistance, the more prone is the reverse pole phenomenon. (4) the maximum power density of stacked L-MFC increases with the increase of influent COD concentration, and the advantages of independent power supply in the treatment of high concentration or low concentration COD wastewater are more obvious. In continuous flow operation mode, the maximum power density of stacked L-MFC increases with the increase of influent COD concentration. The Coulomb efficiency of MFC with independent power supply is generally higher than that of parallel power supply, but the removal load of COD is not different. In addition, the electrode clogging of each electrode chamber can be obtained by measuring the head loss of each cavity. Timely dredging and changing water can restore the output voltage of MFC.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X703;TM911.45

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相關(guān)博士學(xué)位論文 前2條

1 曹效鑫;微生物燃料電池中產(chǎn)電菌與電極的作用機(jī)制及其應(yīng)用[D];清華大學(xué);2009年

2 魏錦程;微生物燃料電池廉價(jià)填料型電極材料的研究[D];清華大學(xué);2012年

本文編號(hào)：1623756