【作者】 张青；

【导师】 党小庆；

【作者基本信息】 西安建筑科技大学 ， 环境工程， 2013， 硕士

【摘要】 论文在实验室条件下以低浓度含甲苯废气作为试验对象，采用按一定比例混合的活性炭与陶瓷环填料，研究填充床式介质阻挡放电反应器对含甲苯废气的净化效果。混合填料中的陶瓷环有利于增强放电强度，活性炭可以提高填料的吸附容量，从而进一步降低反应器的能耗，减少或避免二次污染。论文还对填料中活性炭的低温等离子体再生进行了系统研究。主要研究结果如下：（1）根据电压-电流波形图，填充活性炭混合填料后增加了反应器内微放电的数量，降低了最高脉冲电流幅值，使放电更加均匀、稳定；相比单一活性炭混合填料吸附甲苯，穿透时间延长75min。（2）填料混合比例由1:24增加到1:12时甲苯去除率增加比较明显（18.9%），但是从1:12增加到1:8时，甲苯去除率仅增加了1.1%。甲苯去除率随着外加电压的增加而明显提高，随空塔气速、进口浓度的增加而减少。（3）甲苯降解过程中，反应器出口只检测到了CO、CO₂、H₂O及少量O₃，通过FT-IR和GC/MS分析可知，活性炭表面吸附的甲苯降解的中间产物有苯甲酸，苯甲醛，苯，醚类等，说明填充活性炭可以减少降解过程中副产物的产生。（4）活性炭的等离子体再生过程中反应器出口一直无甲苯，再生后吸附穿透时间比再生前短。活性炭再生效率随再生时间、再生电压的增加而提高，再生时间为120min时再生效率为96.3%，分别比60min、30min条件下提高了2%、7%。随着再生次数的增加，活性炭的再生效率逐渐下降。根据BET和SEM结果，等离子体再生时间过长，会破坏活性炭的孔道结构。更多还原

【Abstract】 This paper used toluene-containing exhaust gas as the experimental object, usedthe activated carbons and ceramic rings filler which mixed in a certain proportion, toresearch how the packed bed reactor impacts toluene removal performance. Ceramicrings in the mixed filler could be conducive to enhancing the intensity of discharge, andactivated carbons could improve the adsorption capacity of fillers. Thus further reducedthe energy consumption of the reactor, and reduced or avoided secondary pollution.Thispaper also did some systematic research on plasma regeneration of the activated carbonin the mixed filler. The main results were as follows:（1） According to the voltage-current wave forms, the mixed filler increased thenumber of reactor’s micro discharge, reduced the maximum amplitude of pulse current,so that the discharge became more uniform and stable; but also can effectively inhibitedthe gas breakdown. Compared to single mixed filler adsorption of toluene, thebreakthrough time of adsorption can be extended for75min.（2） The toluene removal rate increased more obviously（18.9%） when the fillermixing ratio raised from1:24to1:12, but only increased1.1%when the filler mixingratio raised from1:12to1:8. The toluene removal rate increased significantly withenhancing of applied voltage, while decreased with increasing of empty tower gasvelocity and inlet concentration.（3） During toluene degradation process, only detected CO, CO₂, H₂O and a smallamount of O₃from outlet of reactor. According to the analysis of FT-IR and GC/MS, theintermediate product of the degradation of toluene which adsorbed by activated carbon were benzaldehyde, benzoic acid, benzene and ethers. This illustrated that packingactivated carbon could reduce the production of by-products.（4） During plasma regeneration process, no toluene was detected from outlet ofreactor. The breakthrough time of adsorption after regeneration was shorter than beforeregeneration. Extending regeneration time, enhancing applied voltage contributed tohigher regeneration efficiency. With the increase of regeneration frequency, theregeneration efficiency of activated carbon decreasd. The regeneration efficiency ofactivated carbon was96.3%when regenerated for120min, increased2%,7%respectively compared with regenerated for60min,30min. According to the result ofBET and SEM, the plasma would destroy the pore structure of activated carbon whenextending regeneration time.更多还原