摘要
低温等离子体在CO_(2)催化转化方面具有广阔的应用前景,成为国内外的研究热点。常用的电弧、微波或介质阻挡放电应用于CO_(2)转化时通常处于电弧或丝状放电状态,难以调控其电学参数,限制了转化机理的深入研究。为此,提出一种纳秒脉冲激励的获得板-板裸电极下CO_(2)/He可调均匀放电的方法,通过对电学参数的测量,发现CO_(2)体积分数越高,脉冲重复频率(pulse repetition frequency,PRF)越低,稳定放电电压就越高。利用放电图像和光谱探究了不同放电条件对放电稳定性的影响机制,结果显示稳定放电具有辉光放电的特征,后续伴随类汤森放电的余辉。进一步利用特征谱线强度比值r(O_(2)/He)以及CO(B1∑→A1∏)谱带相对强度,分别分析验证了CO_(2)体积分数对放电的影响途径,以及CO_(2)/He在重复频率纳秒脉冲下放电的记忆效应。
Non-thermal plasma is very promising in the CO_(2) conversion application and it has become a worldwide research hotspot. However, the discharge in CO_(2) always transits into arc or filament mode when microwave or dielectric barrier discharge is adopted. It is difficult to regulate the electrical parameters of discharge, which limits the in-depth study of the conversion mechanism. We proposed a method to obtain a uniform CO_(2)/He discharge with plate-to-plate bare electrodes excited by nanosecond pulsed voltage. The ignition voltage and stable discharge voltage were obtained. It was found that the stable discharge voltage became higher when the CO_(2) proportion was higher or the pulse repetition frequency(PRF) was lower. The discharge stability were investigated under different conditions using discharge images and optical emission spectra. Stable discharge exhibited glow discharge mode during the dominant discharge, followed by multiple afterglows similar to the Townsend discharge. Furthermore, spectral line intensity ratio r(O_(2)/He) and the relative intensity of CO band CO(B1∑→A1∏) are analyzed respectively. The discharge has shown memory effect in repetitive nanosecond pulsed discharge.
作者
张恬波
穆海宝
郭毅豪
张冠军
ZHANG Tianbo;MU Haibao;GUO Yihao;ZHANG Guanjun(State Key Laboratory of Electrical Insulation and Power Equipment,School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2021年第4期1495-1503,共9页
High Voltage Engineering
基金
国家重点基础研究发展计划(2016YFD0400905-03HZ)
国家自然科学基金(51477135)。
关键词
CO_(2)/He放电
纳秒脉冲
发射光谱
脉冲重复频率
均匀放电
CO_(2)/He discharge
nanosecond pulse
optical emission spectrum
pulse repetition frequency
uniform discharge
