摘要
与传统的甲烷催化制氢技术相比,低温等离子体技术具有能耗低、无需催化剂、启停迅速、可在常温常压下运行等优点,具有良好的应用前景。为此,研究了空气载气下磁旋滑动弧放电等离子体的物理特性,并开展了甲烷部分氧化重整制氢实验。结果表明:空气体积流量分别为2 L/min、8 L/min、16 L/min时,电弧均可稳定旋转,转速最高为111 r/s,且存在固定的放电周期;而与传统刀片滑动弧不同的是,磁旋滑动弧在2 L/min的体积流量下依然可以维持稳定的运行和较长的电弧长度,从而有利于反应的充分进行;电弧长度和直径对放电电压、电流、功率、电流密度、电场强度和电导率等参数有直接影响。在甲烷部分氧化重整制氢实验中,CH_4的转化率和H_2的选择性均随过量空气系数的增加而先升后降,CH_4的转化率最高可达100%,H_2的选择性最高为42.42%,效果远好于传统的刀片式滑动弧。此外,微富氧的环境有利于甲烷的完全转化。研究结果证明磁旋滑动弧能够促进甲烷部分氧化重整制氢。
Compared with the traditional catalytic processes of hydrogen production from methane, the non-thermal plasma is deemed as a promising technology since it has the advantages of low energy consumption, catalyst free, and fast start-up, and also can operate in ambient conditions. Therefore, physical characteristics of magnetic rotating gliding arc discharge plasma in air was studied and experiment of methane partial oxidation for hydrogen production was carried out. The results show that the arc can rotate steadily when the air flow rate is 2 L/min, 8 L/min, and 16 L/min, respectively, with a maximum speed of 111 r/s and a fixed discharge period. The arc length and diameter have direct influences on several parameters such as discharge voltage, current, power, current density, electric field intensity, and electric conductivity. With the increase of excess air coefficient, both the CH4 conversion and H2 selectivity first augment and then decline. The highest CH4 conversion and H2 selectivity is 100% and 42.42%, respectively, having significant advantage over traditional knife-shaped gliding arc. Besides, an oxygen-rich condition is in favor of the complete conversion of methane. The research results demonstrate that the magnetic rotating gliding arc can assist the methane partial oxidation for hydrogen production.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第6期1893-1900,共8页
High Voltage Engineering
基金
国家自然科学基金(51576174)
高等学校博士学科点专项科研基金(20120101110099)~~
关键词
磁场驱动
旋转滑动弧
等离子体
物理特性
甲烷部分氧化
制氢
magnetically driven
rotating gliding arc
plasma
physical characteristics
methane partial oxidation
hydrogen production
