旋转滑动弧降解垃圾气化焦油组分中的萘  

Decomposition of naphthalene as tar model compound from the gasification of municipal solid waste by rotating gliding arc plasma

作　　者：颜欣 李晓东[1] 朱凤森[1] 孔相植 严建华[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《化工进展》2018年第3期1174-1180,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金项目(51576174)

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H_2和C_2H_2,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。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 6 mg/L,and then decreased. With the rise of gas flow rate from 2 L/min to 12 L/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 H_2 and C_2 H_2,with maximum selectivity of 44.0% and 13.7% respectively. The variation trend of the selectivity of H_2 and C_2 H_2 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.

关 键 词：旋转滑动弧 等离子体 生活垃圾气化 焦油降解 萘 

分 类 号：X705[环境科学与工程—环境工程] TK09[动力工程及工程热物理]