等离子体诱导沼气重整制合成气研究

发布时间：2018-02-19 17:32

本文关键词： 沼气沼气重整滑动弧等离子体协助合成气 CO2利用　出处：《华中农业大学》2015年硕士论文　论文类型：学位论文

【摘要】：沼气作为富含甲烷和二氧化碳这两种气体的低品质燃气,可以充当原料气直接应用到甲烷二氧化碳重整制合成气的生产中,在提高其燃烧品质的同时,减少了温室气体的排放。由于常规甲烷二氧化碳重整方法存在反应温度高、催化剂易积炭失活等问题,利用非平衡等离子体技术,在常规条件下即可实现甲烷二氧化碳制合成气的反应。本课题创新地提出了滑动弧等离子体诱导沼气重整反应制合成气技术路线,为沼气制合成气的高附加值利用提供必要的理论基础。利用刀型滑动弧反应器,系统地开展了沼气重整制合成气研究,考察了反应条件对刀型滑动弧反应器基本放电特性的影响;考察了输入电压、反应停留时间对沼气重整反应的影响规律;通过对刀型滑动弧诱导沼气重整反应性能的分析,揭示了滑动弧等离子体在沼气重整反应中的作用实质。并通过改进滑动弧反应装置,对滑动弧诱导沼气重整做了进一步的研究。其主要成果和结论如下:(1)随着进气流量的增加,平均弧电压与平均电弧功率增加,当进气流量为5-7L/min时,单位流量能耗较低,较适合沼气的重整处理;滑动弧反应器电极间距与厚度对滑动弧等离子体放电性能也具有很重要的影响,电极厚度2mm,电极间距2-3mm时,电极放电效果最佳。(2)输入电压增大后,滑动弧反应器重整性能大幅提升,甲烷和二氧化碳转化率分别提高了28.55%和24.76%;当反应时间延长至75min时,甲烷和二氧化碳这两种原料气接近完全转化。(3)输入电压增大,反应停留时间延长实质上增加了反应体系中等离子体的浓度,电子耦合了更多的能量,高能电子、各种离子和自由基数量的增加,使得整个循环体系中气体分子碰撞电离更加彻底,甲烷二氧化碳重整制合成气反应更加完全。(4)由于刀型滑动弧放电等离子体区域大于新型滑动弧,与刀型滑动弧反应器诱导沼气重整相比,生成单位体积合成气,新型滑动弧反应器将消耗更多的能量。
[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.
【学位授予单位】：华中农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE665.3

【参考文献】