Abstract: In this study,a novel rotating gliding arc(RGA) plasma co-driven by a magnetic field and a tangential gas flow was used for tar decomposition. Naphthalene in nitrogen flow was proposed as a tar surrogate. The effects of injection concentration,gas flow rate and preheating temperature on naphthalene degradation efficiency and gas production were investigated. In addition,liquid byproducts were characterized by gas chromatography-mass spectrometry(GC/MS). With the rise of the injection concentration,the degradation efficiency of naphthalene increased first,reaching a maximum value of 88.3% at 6mg/L,and then decreased. With the rise of gas flow rate from 2L/min to 12L/min,the degradation efficiency of naphthalene decreased continuously from 92.1% to 82.5%. Increasing the preheating temperature could promote the degradation of naphthalene. The results showed that the main gas products were H₂ and C₂H₂,with maximum selectivity of 44.0% and 13.7% respectively. The variation trend of the selectivity of H₂ and C₂H₂ were consistent with that of naphthalene degradation efficiency. The major liquid byproducts were acetylene,indene and acenaphthylene,whose GC/MS peak areas were 2-3 orders of magnitude lower than that of naphthalene. On this basis,the reaction pathways and mechanisms of naphthalene decomposition in the plasma zone were preliminary proposed and discussed.

Key words: rotating gliding arc, plasma, municipal solid waste gasification, tar decomposition, naphthalene

摘要： 采用新型磁场和气流协同驱动旋转滑动弧等离子体，选取萘作为垃圾气化焦油模拟组分，在氮气气氛下开展了焦油裂解初步实验研究。重点考察了进样浓度、进气流量和预热温度对萘裂解效果及气体产物的影响；此外，采用气相色谱质谱联用仪（GC/MS）对液体副产物进行了表征。结果表明，当进气流量恒定时，随着进样浓度的提高，萘的降解率先升后降，在萘浓度为6mg/L时降解率达到最大值88.3%；随着进气流量从2L/min增加到12L/min，萘的降解率持续下降，由92.1%降至82.5%；提高预热温度可促进萘的降解。实验产生的主要气体产物为H₂和C₂H₂，其选择性与萘的降解率变化趋势基本一致，最高分别为44.0%和13.7%；液体副产物主要有苯乙炔、茚、苊烯等，其GC/MS峰面积比萘低2~3个数量级；在此基础上，对滑动弧反应区域中萘的降解路径及机理进行了初步探讨与分析。

关键词: 旋转滑动弧, 等离子体, 生活垃圾气化, 焦油降解, 萘