【作者】 汪晓熙；

【导师】 李胜利；

【作者基本信息】 华中科技大学 ， 环境工程， 2007， 硕士

【摘要】 高压脉冲等离子体-催化协同(non-thermal plasma catalysis)技术被认为是环境领域很有发展前途的一项高新技术。与传统处理方法相比,用该项技术处理有机废气具有以下优点:能耗低,可在室温下与催化剂反应,无需加热,极大地节约了能源;不产生副产物,催化剂可选择性地降解等离子体反应中所产生的副产物;不产生放射物;尤其适于处理低浓度气体。本文采用高压脉冲等离子体-催化协同技术处理甲苯废气,搭建试验平台对采样时间、反应器类型、气体流量、浓度、电压、温度、反应器管数等参数进行研究,同时引入相对、绝对两种去除率的概念,从机理上对等离子体催化协同去除甲苯进行了深入分析。通过试验研究得出如下结论:填充床反应器较之其他类型最有优势;30min的放电时间为待处理物出口浓度的稳定时间;高电压、低浓度以及低流量能有效提高去除效果;采用双管Co(5%)催化反应器(前管填充催化剂,后管不填充),相对去除率可达81.54%;温度对两种去除率的影响各有不同:在一定温度范围内,随温度的升高,绝对去除率随之上升,但相对去除率却随之下降;反应器管数会对对去除效果产生影响,具体来说:采用三管系统时(前两管填充催化剂,后管不填充),相比两管系统情况下绝对去除率有很大提高,但对相对去除率影响较小,均维持在80%附近。可见一味增加反应器级数并不能进一步增加去除效果。空管无论添加催化剂与否两种去除率都很低。更多还原

【Abstract】 Non-thermal plasma catalysis for volatile organic compounds (VOCs) treatment is considered to be a high-tech development in the future. Compared with the traditional approach, this technology has many advantages in VOCs treatment. Such as low energy consumption, with the catalyst at room temperature, without heating, thus saving energy; does not produce byproduct and radioactive material; particularly suit to treat VOCs with low concentrations.In this paper, we use non-thermal plasma generating by high voltage nanosecond pulse to treat toluene (C6H5-CH3) with catalysts. In laboratorial system, important parameters have been investigated, such as the time, the type of the reactors, gas flow rate, inlet toluene concentration, peak voltage and temperature. Introduce the concept of relative removal rate and absolute removal rate, based on which the reaction mechanism of toluene by catalysis-assisted non-thermal plasma has been explored deeply.The conclusions can be get :The packed bed reactor is much better than other types reactor. Outlet toluene concentration can be stability in 30min. Use high peak voltage, low concentration and low flow rate can effectively raise purifying effect. We design a two-tubes system which first tube has been filled the Co (5%) catalyst and second tube has been filled nothing. To the two-tubes reactor using Co (5%) catalyst, the relative removal rate of toluene has a maximum of 81.54%. With the toluene temperature rising the absolute removal rate rise, but it declined substantially relative removal rate. With three-tubes system, Co (5%) catalyst added to the two tubes catalyst, but third tube was filled nothing. The removal of the relatively less affected, the removal rate in the vicinity of 80%, but the absolute removal of a greater impact. With Co (5%) catalyst or not in the empty tube, the relative removal rate and absolute removal rate are both low.更多还原