摘要
为探究不同氮气浓度对扰动条件下甲烷爆炸特性的影响,采用20 L球形爆炸试验装置开展了不同浓度(体积分数)甲烷爆炸的抑制试验,试验的扰动条件由空气射流产生,扰动强度通过粉尘仓的初始压力控制,并采用CHEMKIN软件对甲烷爆炸的反应机理进行了敏感性分析。结果表明:无论是均匀静置状态还是扰动条件下,甲烷的爆炸强度均随氮气浓度的增加逐渐减弱,且氮气对高浓度甲烷爆炸的抑制作用更显著,在11.2%甲烷浓度和1.5 MPa扰动强度下甲烷的最大爆炸压力下降值最大,其值为0.6635 MPa;相比均匀静置状态,扰动条件在一定程度上削弱了氮气对甲烷爆炸的抑制作用,增加了甲烷的爆炸强度,导致甲烷的爆炸压力峰值时刻延长,且不同扰动强度之间甲烷的最大爆炸压力值均相近;氮气不会直接参与甲烷爆炸过程中的基元反应,而是通过稀释反应系统中的氧气浓度来影响基元反应的进行。该研究结果可为有效防治瓦斯爆炸提供理论参考。
The effect of nitrogen volume fraction on the explosion characteristics of CH4/N2/air mixtures at different methane volume fraction under different turbulence conditions was experimentally studied by using a 20 L sphere explosion experimental equipment.The turbulence condition of the experiment was generated by the air jet,and its intensity is controlled by changing the initial pressure of the powder storage tank.Then the sensitivity analysis of the reaction mechanism of methane explosion was conducted by using CHEMKIN software.The results show that whether it is under the standing condition or turbulence condition,the explosion intensity of methane gradually decreases with the increase of nitrogen conce nt ration,and nitrogen has a more significant suppression effect on high-concentration methane,and the maximum explosion pressure drop has a maximum value of 0.6635 MPa when the methane concentration is 11.2%and the turbulence intensity is 1.5 MPa.Compared to a standing condition,the turbulence weakens the explosion inhibitory effect of nitrogen to a certain ext ent,increases the explosion intensity of methane,and prolongs the explosion pressure peak time.Besides,the maximum explosion pressure of met hane is similar bet ween different turbulence intensities.Nitrogen does not directly participate in the elementary reaction in the methane explosion process,but affects the progress of the elementary reactions by diluting the oxygen concentration in the reaction system.The research results can provide theoretical reference for effective prevention and control of gas explosion.
作者
王培龙
江丙友
苏明清
王保
杨炳辉
洪汉
WANG Peilong;JIANG Binyou;SU Mingqing;WANG Bao;YANG Binghui;HONG Han(Key Laboratory of Industrial Dust Prevention and Control&Occupational Health and Safety,Ministry of Education Anhui University of Science&Technology,Huainan 232001,China;School of Safety Science and Engineering Anhui University of Science&Technology,Huainan 232001,China;School of Emergency Management and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100038,China)
出处
《安全与环境工程》
CAS
CSCD
北大核心
2023年第3期61-68,共8页
Safety and Environmental Engineering
基金
国家自然科学基金项目(51874009)。
关键词
甲烷爆炸
抑爆试验
氮气
扰动
敏感性分析
CHEMKIN软件
methane explosion
explosion suppression experiment
nitrogen
turbulence
sensitivity analysis
CHEMKIN software
作者简介
王培龙(1996-),男,硕士研究生,主要研究方向为气体粉尘爆炸防治。E-mail:1512901842@qq.com;通讯作者:苏明清(1995-),男,博士研究生,主要研究方向为气体粉尘爆炸防治。E-mail:mqsu_cauc@163.com。
