本文關鍵詞： 沼氣 沼氣重整 滑動弧等離子體協(xié)助 合成氣 CO2利用　出處：《華中農業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：沼氣作為富含甲烷和二氧化碳這兩種氣體的低品質燃氣,可以充當原料氣直接應用到甲烷二氧化碳重整制合成氣的生產中,在提高其燃燒品質的同時,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溫度高、催化劑易積炭失活等問題,利用非平衡等離子體技術,在常規(guī)條件下即可實現(xiàn)甲烷二氧化碳制合成氣的反應。本課題創(chuàng)新地提出了滑動弧等離子體誘導沼氣重整反應制合成氣技術路線,為沼氣制合成氣的高附加值利用提供必要的理論基礎。利用刀型滑動弧反應器,系統(tǒng)地開展了沼氣重整制合成氣研究,考察了反應條件對刀型滑動弧反應器基本放電特性的影響;考察了輸入電壓、反應停留時間對沼氣重整反應的影響規(guī)律;通過對刀型滑動弧誘導沼氣重整反應性能的分析,揭示了滑動弧等離子體在沼氣重整反應中的作用實質。并通過改進滑動弧反應裝置,對滑動弧誘導沼氣重整做了進一步的研究。其主要成果和結論如下:(1)隨著進氣流量的增加,平均弧電壓與平均電弧功率增加,當進氣流量為5-7L/min時,單位流量能耗較低,較適合沼氣的重整處理;滑動弧反應器電極間距與厚度對滑動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,電極放電效果最佳。(2)輸入電壓增大后,滑動弧反應器重整性能大幅提升,甲烷和二氧化碳轉化率分別提高了28.55%和24.76%;當反應時間延長至75min時,甲烷和二氧化碳這兩種原料氣接近完全轉化。(3)輸入電壓增大,反應停留時間延長實質上增加了反應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更加完全。(4)由于刀型滑動弧放電等離子體區(qū)域大于新型滑動弧,與刀型滑動弧反應器誘導沼氣重整相比,生成單位體積合成氣,新型滑動弧反應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.
【學位授予單位】：華中農業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE665.3

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本文編號：1517717