分段电极介质阻挡放电CO_(2)重整CH4过程放电特性与反应性能研究  

Discharge Characteristics and Reaction Performance of CH_() Reforming with CO_(2) in Dielectric Barrier Discharge with Segmented Electrodes

作　　者：孙闵杰 付军辉 刘泓麟 梅丹华 方志 Sun Minjie;Fu Junhui;Liu Honglin;Mei Danhua;Fang Zhi(College of Electrical Engineering and Control Science Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学电气工程与控制科学学院,南京211816

出　　处：《电工技术学报》2023年第15期3972-3983,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金面上项目(52177149);江苏省六大人才高峰项目(TD-JNHB-006);2023年江苏省研究生科研创新计划(KYCX23_1447)资助。

摘　　要：大气压低温等离子体可在温和条件下进行CO_(2)重整CH4反应,对环境保护和能源供应具有双重意义。介质阻挡放电(DBD)是进行该反应最常用的放电等离子体形式之一,但其工艺过程和反应性能受到反应器结构的显著影响。前期研究发现,分段电极DBD可以调节CO_(2)重整CH4反应过程的反应物转化率、产物分布及能量效率,但是分段电极数量和相邻电极间距对上述性能参数的影响机理尚不清晰。因此,该文设计了具有不同电极数量和不同相邻电极间距的分段电极DBD反应器,并用于CO_(2)重整CH4反应,从电学特性和温度特性的角度研究了不同实验条件下的放电特性,比较分析了对应条件下的CO_(2)重整CH4反应性能。结果表明,分段电极的引入可以增加放电边缘数量以增强边缘效应,且增加分段电极数量和增加相邻电极间距均可延长反应物的有效停留时间,上述因素均有助于提高等离子体CO_(2)重整CH4的反应性能。在施加电压11.0 kV条件下采用4段外电极时可获得最高的CO_(2)转化率(17.7%)和CH4转化率(29.5%),以及最大的CO选择性(36.0%)。而在2段电极结构中,当相邻电极间距为3 cm时,可获得最高的总反应物转化能量效率(0.334 mmol/kJ)。CH4 reforming with CO_(2) is an effective way to convert the main two greenhouse gases(CO_(2) and CH_(4))into value-added chemicals.However,the traditional methods for this reaction have limitations in terms of operating conditions,reactant conversion and product selectivity,catalyst preparation and activity maintenance,due to its highly endothermic characteristics.Non-thermal plasma,as a novel molecule activation approach,has provided new routes for CH_(4) reforming with CO_(2).Dielectric barrier discharge(DBD)has attracted most attention for this process due to its simple structure,the potential plasma-catalysis synergy,and successful experience in industrial applications.The performance of this process is significantly affected by the reactor structure,and it has been demonstrated that using DBD with segmented electrodes is one approach to adjust the reactant conversion,product distribution and energy efficiency of this process,but the influence mechanism of the number of segmented electrodes and the distance between adjacent electrodes on the above performance parameters is still unclear.To deal with these issues,CH_(4) reforming with CO_(2) has been performed in DBD reactors with segmented electrodes.The discharge characteristics and the reaction performance are investigated in detail under different conditions(e.g.,the number of segmented electrodes and the distance between adjacent electrodes).The DBD reactors are self-designed with quartz tube,stainless-steel rod and mesh,which functions as the dielectric tube,high-voltage electrode and low-voltage electrode,respectively.The low-voltage electrode is grounded via a reference capacitor.In order to investigate their respective influences,the number of segmented electrodes is set as 1,2,3 and 4 when the total length of the low-voltage electrode is fixed at 120 mm;while the distance between adjacent electrodes is set as 10 mm,20 mm,and 30 mm when the number of segmented electrodes is 2.A custom-built AC power source is used to drive the DBD reactors.The applie

关 键 词：分段电极介质阻挡放电 CO_(2)重整CH4 电极数量 相邻电极间距 

分 类 号：TM614[电气工程—电力系统及自动化]