Mechanism of Activation and Conversion of Coalbed Methane Under Cold Plasma by Optical Emission Spectroscopy

XU Feng; ZHU Li-hua; LI Chuang

doi:10.3788/fgxb20173803.0372

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Mechanism of Activation and Conversion of Coalbed Methane Under Cold Plasma by Optical Emission Spectroscopy

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- Mechanism of Activation and Conversion of Coalbed Methane Under Cold Plasma by Optical Emission Spectroscopy
- Chinese Journal of Luminescence Vol. 38, Issue 3, Pages: 372-379(2017)
- 作者机构：
  
  黑龙江科技大学安全工程学院, 黑龙江哈尔滨 150022
- 作者简介：
- 基金信息：
  
  Supported by National Natural Science Foundation of China(51374098,51504087)
- DOI：10.3788/fgxb20173803.0372
  CLC： O433.4
- Received：13 September 2016，
  
  Revised：21 October 2016，
  
  Published：05 March 2017
- 稿件说明：
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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

XU Feng, ZHU Li-hua, LI Chuang. Mechanism of Activation and Conversion of Coalbed Methane Under Cold Plasma by Optical Emission Spectroscopy[J]. Chinese Journal of Luminescence, 2017,38(3): 372-379
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 DOI： 10.3788/fgxb20173803.0372.

XU Feng, ZHU Li-hua, LI Chuang. Mechanism of Activation and Conversion of Coalbed Methane Under Cold Plasma by Optical Emission Spectroscopy[J]. Chinese Journal of Luminescence, 2017,38(3): 372-379 DOI： 10.3788/fgxb20173803.0372.

摘要

为了探究低温等离子体活化转化煤层甲烷的机理，采用自制的介质阻挡放电实验系统对体积组成为CH

40%、O

12%、N

48%的模拟煤层甲烷进行等离子体活化转化。采用色谱分析方法对煤层甲烷介质阻挡放电稳定产物进行分析，结果表明低温等离子体活化煤层甲烷的主要产物为CH

OH、CO和CO

。采用发射光谱原位诊断技术在200~700 nm波长范围内研究了放电气体的发射光谱，检测到O、CH、C、H

、N

（

）等激发态物种。基于发射光谱原位诊断和气相色谱分析结果，对煤层甲烷活化转化的自由基反应过程进行了推断。同时，明晰了反应气中N

对煤层甲烷活化和主要产物的生成具有促进作用，即N

产生了存活时间更长的亚稳态离子，该亚稳态离子将能量传递给反应气中的O

和CH

，进而加速了煤层甲烷的活化和稳定产物的生成。

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 CH

and N

(the volume fraction of CH

and N

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

CO and CO

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

and N

(

) 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 N

in the mixture gas has promoting effect on activation of coalbed methane and production of main products. That is

produces metastable ions with longer survival time. The metastable ions transfer the energy to O

and CH

in the mixture gas

which accelerates the activation of methane and formation of main stable products.

关键词

Keywords

references

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