冷等离子体活化煤层甲烷的实验研究  

Experimental study on activation of coal bed methane using cold plasma

作　　者：朱丽华[1] 谢志刚[1] 徐海梅[1] 王丹[1] 徐锋[1] 王珏[1] 赵晓鹏[1] 

机构地区：[1]黑龙江科技大学安全工程学院,黑龙江哈尔滨150022

出　　处：《应用化工》2016年第12期2276-2279,2283,共5页Applied Chemical Industry

基　　金：黑龙江省教育厅科学技术研究项目(12543056)

摘　　要：为了探究冷等离子体促进煤层甲烷活化转化效果,以自制的实验系统对甲烷、氧气和氮气的混合气体进行了介质阻挡放电。结果表明,随着输入电压的增大,甲烷转化率增加,甲醇选择性减小,一氧化碳和二氧化碳选择性先增加后减小;随着放电频率的增大,甲烷转化率减小,甲醇、一氧化碳和二氧化碳的选择性先增加后减小;随着气体流量的增加,甲烷转化率降低,而甲醇、一氧化碳和二氧化碳选择性增大;随着反应气甲烷体积分数的升高,甲烷转化率和二氧化碳选择性降低,一氧化碳和甲醇的选择性先升高后降低;当反应气中氧气与氮气摩尔比升高时,甲烷转化率增大,而一氧化碳、二氧化碳和甲醇的选择性变化不大,但在氧气与氮气摩尔比为0.25时甲醇的选择性最大;较小的放电间隙利于甲醇选择性的提高,较大的放电间隙利于一氧化碳选择性的提高,而过小或过大的放电间隙都不利于甲烷转化率及二氧化碳选择性的提高。In order to study effect of cold plasma promoting coal bed methane activation and conversion,in a home-made experimental apparatus,gas mixture of methane,oxygen and nitrogen were discharged with dielectric barrier discharge. The result shows that with the increase of the input voltage,methane conversion increased,while methanol selectivity decreased,the selectivity of carbon monoxide and carbon dioxide decreased after increased. With the increase of discharge frequency,the conversion of methane decreased,while the selectivity of methanol,carbon monoxide and carbon dioxide increased before they reduced. With the increase of total flow rate,the conversion of methane reduced,while the selectivity of methanol,carbon monoxide and carbon dioxide increased. With the increase of volume fraction of methane in reaction gases,the conversion of methane and the selectivity of carbon dioxide decreased,the selectivity of carbon monoxide and methanol increased before they reduced. With the increase of molar ratio of oxygen to nitrogen,the conversion of methane increased,while the selectivity of methanol,carbon monoxide and carbon dioxide kept steady,whereas the selectivity of methanol reached a maximum when the molar ratio of oxygen to nitrogen is 0. 25. Smaller discharge gap distance benefits increase of the selectivity of methanol,and bigger discharge gap distance benefits increase of the selectivity of carbon monoxide,while smaller or bigger discharge gap distance goes against methane conversion,as well as carbon dioxide formation.

关 键 词：甲烷 活化 冷等离子体 介质阻挡放电 

分 类 号：TQ519[化学工程]