低温等离子体促进煤层甲烷活化转化

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英文篇名：Study on activation and conversion of methane using non-thermal plasma 作者：徐锋 ; 李创 ; 朱丽华 英文作者：XU Feng;LI Chuang;ZHU Lihua;School of Safety Engineering, Heilongjiang University of Science & Technology; 关键词：甲烷 ; 活化 ; 转化 ; 等离子体 ; 介质阻挡放电 英文关键词：methane;;activation;;conversion;;plasma;;dielectric barrier discharge 中文刊名：HLJI 英文刊名：Journal of Heilongjiang University of Science and Technology 机构：黑龙江科技大学安全工程学院; 出版日期：2015-11-30 出版单位：黑龙江科技大学学报 年：2015 期：v.25;No.110 基金：国家自然科学基金项目(51504087;51374098);; 黑龙江省教育厅科学技术研究项目(12543056) 语种：中文; 页：HLJI201506005 页数：5 CN：06 ISSN：23-1588/TD 分类号：23-27

摘要

为探究低温等离子体促进煤层甲烷活化转化的电源参数和工艺参数,以自制实验系统对CH_4 、O_2和N_2的混合气体进行介质阻挡放电,考察输入电压、放电频率、气体总流量、气体组分、放电间隙对CH_4 转化率及主要产物产率的影响。结果表明:若以CH_4 转化率和CO产率为评价指标,输入电压90 V、放电频率7 k Hz、气体总流量65 m L/min较适宜;若以CH3OH和CO_2产率为评价指标,输入电压65 V、放电频率9 kHz、气体总流量195 m L/min较为适宜;若以CH_4 转化率及CO、CO_2产率为评价指标,反应气体中CH_4 体积分数不宜高、而O_2与N_2的量比不宜低,放电间隙2 mm为宜;若以CH_3OH的产率为评价指标,反应气体中CH_4 体积分数为40%、O_2与N_2的量比为0.25,放电间隙1 mm为宜。电源输入电压65 V、放电频率9 k Hz、气体总流量195 m L/min、反应气体中CH_4 体积分数及O_2与N_2的量比分别为40%和0.25、放电间隙1 mm时,CH_4 转化率及主要产物产率较高。
        This paper is dev oted to investigating power parameters and process parameters of non-thermal plasma promoting coalbed methane activation. The investigation is realized by the dielectric barrier discharge of gas mixture of CH_4 , O_2 and N_2in a self-made experimental system; the exploration of the effect of input voltage, discharge frequency, total flow rate, gas composition, discharge gap distance on CH_4 conversion and yield of other main products. The experiment results show that taking CH_4 conversion and yield of CO as an evaluation index justifies the application of input voltage of 90 V, discharge frequency of 7 k Hz and total flow rate of 65 m L/min; choosing yield of CH_3OH and CO_2 as an evaluation index involves input voltage of 65 V, discharge frequency of 9 k Hz and total flow rate of 195 m L/min;choosing CH_4 conversion and yield of CO, CO_2 as an evaluation index means the application of neither a high volume fraction of CH_4 in reactive gas nor a low molar ratio of O_2 to N_2and of discharge gap distance of 2 mm; taking yield of CH3 OH as an evaluation index dictates the prescribed reaction conditions: volume fraction of CH_4 40%,molar ratio of O_2 to N_20.25, and discharge gap distance 1 mm.The comprehensive comparison shows that a higher CH_4 conversion and yield of other main products come from the proposed reaction conditions: input voltage 90 V, discharge frequency 9 k Hz, total flow rate 195 m L/min, volume fraction of CH_4 40%,molar ratio of O_2 to N_20.25, and discharge gap distance 1 mm.

引文

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