发光学报2017，Vol.38Issue(3)：372-379,8.DOI:10.3788/fgxb20173803.0372
低温等离子体活化转化煤层甲烷机理的光谱诊断
Mechanism of Activation and Conversion of Coalbed Methane Under Cold Plasma by Optical Emission Spectroscopy
摘要
Abstract
In order to study mechanism of activation and conversion of coalbed methane under cold plasma,the investigation was realized by dielectric barrier discharge of gas mixture of CH4,O2 and N2 (the volume fraction of CH4,O2 and N2 is 40%,12% and 48%,respectively).In this study,a set of experimental system of plasma activation and conversion of coalbed methane was constructed.The experiment system was used to study affecting factors of activation and conversion of coalbed methane,such as discharge voltage and discharge frequency.Based on this,the stable products of coalbed methane conversion were analyzed by the gas chromatograph,As main stable products of conversion of coalbed methane under cold plasma,CH3OH,CO and CO2 were detected.In situ diagnosis technique of optical emission spectroscopy was used to study the emission spectra of the gas discharge in the spectra range of 200-700 nm,active species of O·,CH·,C·,Hα and N2(A3+U) were observed.Based on the detection of the active species,the analysis of stable products by gas chromatograph and the characterization of plasma,the course of free radical reaction of the activation and conversion of coalbed methane under cold plasma were inferred.Meanwhile,it is clarified that N2 in the mixture gas has promoting effect on activation of coalbed methane and production of main products.That is,N2 produces metastable ions with longer survival time.The metastable ions transfer the energy to O2 and CH4 in the mixture gas,which accelerates the activation of methane and formation of main stable products.关键词
发射光谱/煤层甲烷/低温等离子体/机理Key words
optical emission spectroscopy/coalbed methane/cold plasma/mechanism分类
数理科学引用本文复制引用
徐锋,朱丽华,李创..低温等离子体活化转化煤层甲烷机理的光谱诊断[J].发光学报,2017,38(3):372-379,8.基金项目
国家自然科学基金(51374098,51504087)资助项目 Supported by National Natural Science Foundation of China(51374098,51504087) （51374098,51504087）
