低温等离子体活化转化煤层甲烷机理的光谱诊断

发布时间：2018-04-14 13:06

本文选题：发射光谱 + 煤层甲烷　；参考：《发光学报》2017年03期

【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CH440%、O212%、N248%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CH3OH、CO和CO_2。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·、Hα、N2(A3Σ+U)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N2对煤层甲烷活化和主要产物的生成具有促进作用,即N2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O2和CH4,进而加速了煤层甲烷的活化和稳定产物的生成。
[Abstract]:In order to explore the mechanism of methane conversion from coal seam by low temperature plasma activation, a self-made dielectric barrier discharge (DBD) experimental system was used to conduct plasma activation transformation of methane in simulated coal seam with CH440O212and N248% volume composition.The stable products of methane dielectric barrier discharge in coal seam were analyzed by chromatographic analysis. The results show that the main products of methane activation in coal seam by low temperature plasma are Ch _ 3OH _ (10) CO and CO _ 2.The emission spectra of the discharge gas have been studied in the wavelength range of 200 ~ 700 nm by using in situ diagnostic technique of emission spectra. Excited species such as O _ (Ch) C ~ (2 +) H ~ (2 +) N _ (2) O _ (2) A _ (3 危) have been detected.Based on the results of in situ emission spectrum diagnosis and gas chromatographic analysis, the free radical reaction process of methane activation and transformation in coal seam was inferred.At the same time, it is clear that N2 in the reaction gas can promote the activation of coal bed methane and the formation of main products, that is, N2 produces metastable ions with longer survival time.The metastable ions transfer energy to O2 and Ch _ 4 in the reaction gas, which accelerates the activation of coal bed methane and the formation of stable products.
【作者单位】：黑龙江科技大学安全工程学院;
【基金】：国家自然科学基金(51374098,51504087)资助项目~~
【分类号】：TD712

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