本文關(guān)鍵詞： 沼氣 沼氣重整 滑動(dòng)弧等離子體協(xié)助 合成氣 CO2利用　出處：《華中農(nóng)業(yè)大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：沼氣作為富含甲烷和二氧化碳這兩種氣體的低品質(zhì)燃?xì)?可以充當(dāng)原料氣直接應(yīng)用到甲烷二氧化碳重整制合成氣的生產(chǎn)中,在提高其燃燒品質(zhì)的同時(shí),減少了溫室氣體的排放。由于常規(guī)甲烷二氧化碳重整方法存在反應(yīng)溫度高、催化劑易積炭失活等問(wèn)題,利用非平衡等離子體技術(shù),在常規(guī)條件下即可實(shí)現(xiàn)甲烷二氧化碳制合成氣的反應(yīng)。本課題創(chuàng)新地提出了滑動(dòng)弧等離子體誘導(dǎo)沼氣重整反應(yīng)制合成氣技術(shù)路線(xiàn),為沼氣制合成氣的高附加值利用提供必要的理論基礎(chǔ)。利用刀型滑動(dòng)弧反應(yīng)器,系統(tǒng)地開(kāi)展了沼氣重整制合成氣研究,考察了反應(yīng)條件對(duì)刀型滑動(dòng)弧反應(yīng)器基本放電特性的影響;考察了輸入電壓、反應(yīng)停留時(shí)間對(duì)沼氣重整反應(yīng)的影響規(guī)律;通過(guò)對(duì)刀型滑動(dòng)弧誘導(dǎo)沼氣重整反應(yīng)性能的分析,揭示了滑動(dòng)弧等離子體在沼氣重整反應(yīng)中的作用實(shí)質(zhì)。并通過(guò)改進(jìn)滑動(dòng)弧反應(yīng)裝置,對(duì)滑動(dòng)弧誘導(dǎo)沼氣重整做了進(jìn)一步的研究。其主要成果和結(jié)論如下:(1)隨著進(jìn)氣流量的增加,平均弧電壓與平均電弧功率增加,當(dāng)進(jìn)氣流量為5-7L/min時(shí),單位流量能耗較低,較適合沼氣的重整處理;滑動(dòng)弧反應(yīng)器電極間距與厚度對(duì)滑動(dòng)弧等離子體放電性能也具有很重要的影響,電極厚度2mm,電極間距2-3mm時(shí),電極放電效果最佳。(2)輸入電壓增大后,滑動(dòng)弧反應(yīng)器重整性能大幅提升,甲烷和二氧化碳轉(zhuǎn)化率分別提高了28.55%和24.76%;當(dāng)反應(yīng)時(shí)間延長(zhǎng)至75min時(shí),甲烷和二氧化碳這兩種原料氣接近完全轉(zhuǎn)化。(3)輸入電壓增大,反應(yīng)停留時(shí)間延長(zhǎng)實(shí)質(zhì)上增加了反應(yīng)體系中等離子體的濃度,電子耦合了更多的能量,高能電子、各種離子和自由基數(shù)量的增加,使得整個(gè)循環(huán)體系中氣體分子碰撞電離更加徹底,甲烷二氧化碳重整制合成氣反應(yīng)更加完全。(4)由于刀型滑動(dòng)弧放電等離子體區(qū)域大于新型滑動(dòng)弧,與刀型滑動(dòng)弧反應(yīng)器誘導(dǎo)沼氣重整相比,生成單位體積合成氣,新型滑動(dòng)弧反應(yīng)器將消耗更多的能量。
[Abstract]:As a low quality gas rich in methane and carbon dioxide, biogas can be directly used as feedstock gas in the production of methane carbon dioxide reforming to syngas, while improving its combustion quality. Because of the problems of high reaction temperature and easy deactivation of catalyst in the conventional methane carbon dioxide reforming method, the non-equilibrium plasma technology is used to reduce the greenhouse gas emission. The reaction of methane carbon dioxide to syngas can be realized under conventional conditions. This paper provides the necessary theoretical basis for the utilization of high added value of biogas to syngas. The research on biogas reforming to syngas has been carried out systematically by using a knife sliding arc reactor. The effects of reaction conditions on the basic discharge characteristics of the knife type sliding arc reactor, the effect of input voltage and reaction residence time on the biogas reforming reaction were investigated, and the performance of the knife type sliding arc induced biogas reforming reaction was analyzed. The effect of sliding arc plasma on biogas reforming reaction is revealed. Further research on sliding arc induced biogas reforming is carried out by improving the sliding arc reactor. The main results and conclusions are as follows: 1) with the increase of inlet gas flow rate, The average arc voltage and the average arc power increase. When the inlet flow rate is 5-7L / min, the unit flow energy consumption is lower, which is more suitable for biogas reforming treatment. The electrode spacing and thickness of the sliding arc reactor also have an important influence on the discharge performance of the sliding arc plasma. When the electrode thickness is 2mm and the electrode spacing is 2-3mm, the best electrode discharge effect is increased when the input voltage increases. The reforming performance of sliding arc reactor was greatly improved, the conversion of methane and carbon dioxide were increased by 28.55% and 24.76, respectively, and the input voltage of methane and carbon dioxide were increased when the reaction time was extended to 75 minutes. The prolongation of the reaction residence time increases the plasma concentration in the reaction system, coupled with more energy, high energy electrons, various ions and free radicals. The collision ionization of gas molecules in the whole cycle system is more complete, and the reaction of reforming methane with carbon dioxide to syngas is more complete. Compared with the biogas reforming induced by the knife sliding arc reactor, the new type sliding arc reactor will consume more energy than the unit volume synthesis gas.
【學(xué)位授予單位】：華中農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TE665.3

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