正戊烷介质阻挡放电等离子体转化的发射光谱研究  

Study on emission spectra of conversion of n-pentane dielectric barrier discharge plasma

作　　者：吴祖良[1] 郝晓东 章旭明[1] 周为莉 姚水良[1] 王建新[2] WU Zu-liang;HAO Xiao-dong;ZHANG Xu-ming;ZHOU Wei-li;YAO Shui-liang;WANG Jian-xin(School of Environmental Science and Engineering,Zhejiang Gongshang University,Hangzhou 310018,China;Environmental Design Institute,Zhejiang Gongshang University,Hangzhou 310012,China)

机构地区：[1]浙江工商大学环境科学与工程学院,浙江杭州310018 [2]浙江工商大学环保设计研究院,浙江杭州310012

出　　处：《高校化学工程学报》2019年第1期237-244,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金项目(11775189);浙江省新苗人才计划(2018R408061;2018R408063)

摘　　要：发射光谱是等离子体诊断的最有效方法,本实验将发射光谱应用于温压双控介质阻挡反应系统,研究正戊烷(C5)-氩气(Ar)在等离子场中的转化机制,具体分析了放电功率、温度、压力等关键影响因素下发射光谱特性、C5的转化率和产物选择性。实验结果表明:发射光谱强度以及C5转化率与放电功率呈线性增加关系,但不同放电功率下产物的选择性基本不变;随着温度升高(298～473 K)和压力(0.40～1.0 bar)的减小,光谱强度增强,C5转化率提高,但氢气的选择性基本维持在10%;发射光谱强度的变化与C5转化率的变化具有很好的吻合性,表明高能电子碰撞反应对C5的初步分解起到重要的作用。但从反应产物分析,气相短链烃和液相长链烃同时存在,且选择性基本保持不变,说明后续的自由基反应和热化学反应决定了最终的产物,且其化学反应平衡受本实验反应条件影响不大。Optical emission spectroscopy(OES)is the most effective method for plasma diagnosis.It was applied to a temperature-pressure dual-control dielectric barrier reaction system to study the conversion mechanism of n-pentane(C5)-argon(Ar)in plasma field.Effects of discharge power,temperature and pressure on the characteristics of OES,C5 conversion and products were analyzed.The experimental results show that the emission spectral intensity and C5 conversion rate increase linearly with discharge power,but product selectivity at different discharge powers remains unchanged.With the increase of temperature(298~473 K)and the decrease of pressure(0.40~1.0 bar),both emission spectral intensity and C5 conversion rate increase,but hydrogen selectivity maintains at 10%.The variation of emission spectral intensity was in good agreement with the change of C5 conversion rate,which indicates that high-energy electron collision reactions play an important role in the initial decomposition of C5.Moreover,gas-phase short-chain hydrocarbons and liquid-phase long-chain hydrocarbons exist simultaneously and selectivity remains unchanged,which indicates that the subsequent free radical reaction and thermo-chemical reaction determine the final product,and their chemical reaction equilibriums are affected by reaction conditions.

关 键 词：介质阻挡放电 发射光谱 C5转化 H2 气相短链烃 液相长链烃 

分 类 号：TK91[动力工程及工程热物理]