摘要
为研究瓦斯煤尘复合爆炸影响因素的耦合规律,对煤粉质量浓度、甲烷体积分数、煤粉粒径、煤粉种类等4种影响因素进行了多因素与单因素实验分析。通过正交实验,将各因素对爆炸的影响进行了定量分析,结果表明,4个因素对最大爆炸压力p_(max)的影响由强到弱依次为:甲烷体积分数、煤粉质量浓度、煤粉种类、煤粉粒径;对最大爆炸压力上升速率(dp/dt)_(max)的影响程度由强到弱依次为:甲烷体积分数、煤粉质量浓度、煤粉粒径、煤粉种类。对于体积分数为9%、11%的甲烷,复合体系的p_(max)随煤粉的质量增加而减小。当煤粉质量浓度增加到100、200 g/m3时,在与体积分数为6%的甲烷耦合作用下,会产生更强的“激励”作用,且煤粉浓度较大时,挥发分低的煤种最佳瓦斯浓度会降低。甲烷体积分数存在临界值,该临界值会改变挥发分因素的影响方式:低于此临界值时,高挥发分煤尘体系的(dp/dt)_(max)更高,(dp/dt)_(max)来临时间更短;高于此临界值时,低挥发分体系具有更高的爆炸强度。粒径影响挥发分的作用,粒径越大,挥发分的影响差异越明显。当甲烷体积分数为11%时,挥发分高的煤尘更容易受粒径的影响,直径小的煤尘体系,爆炸系数Kst更小;而低挥发分煤粉在甲烷体积分数接近当量时受粒径影响更明显。
In order to reveal the coupling law of the influencing factors in gas/coal dust composite explosion,experiments were conducted in a 20 L spherical explosion device.Multi-factor and single-factor experimental analyses were conducted on four influencing factors according to explosion parameters,including coal concentration,methane volume fraction,coal particle size,and coal type.By conducting orthogonal experiments on the influencing factors,and using the explosion parameters as indicators to carry out range analysis and variance analysis,the influence of each factor on the explosion had been quantified.The experimental results show that the degree of influence of the four factor on p_(max)are(from strong to weak):methane volume fraction,coal dust mass concentration,coal dust type,and coal dust particle size;the effects on(dp/dt)_(max)are(from strong to weak):methane volume fraction,coal dust mass concentration,coal dust particle size,and coal dust type.For methane concentrations of 9%and 11%,the value of p_(max)of the composite system decreases with increasing mass of coal dust.When the mass concentration of coal dust increases to 100 g/m3 and 200 g/m3,coupled with 6%volume fraction of methane,it will produce a stronger“incentive”effect,and when the concentration of coal dust is larger,the low volatility will reduce the optimal gas concentration.The existence of a certain critical value of methane concentration will change the influence mode of volatile factors.Below this value,the value of(dp/dt)_(max)of the high volatile coal dust system is higher,and its arrival time is shorter,while above this value,the low volatile fraction system has a higher explosion intensity.Particle size implicates the influence of volatile fraction,the larger the particle diameter,the more obvious the difference produced by the volatile fraction factor.At 11%methane concentration,coal dust with high volatile fraction is more susceptible to the effect of particle size,and the smaller diameter coal dust system has smaller Kst value;at methane concentration close to equivalent,low volatile fraction coal dust is more significantly affected by the particle size factor.
作者
郭佳琪
裴蓓
徐梦娇
李世梁
韦双明
胡紫维
GUO Jiaqi;PEI Bei;XU Mengjiao;LI Shiliang;WEI Shuangming;HU Ziwei(Collaborative Innovation Center of Coal Safety Production of Henan Province,Jiaozuo 454003,Henan,China;College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,Henan,China)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2022年第11期171-182,共12页
Explosion and Shock Waves
基金
中国博士后科学基金(2019T120622)
河南省高校科技创新人才支持计划(22HASTIT027)
河南省科技攻关项目(212102310006)。
关键词
瓦斯
煤尘
气粉爆炸
影响因素
耦合作用
gas
coal dust
gas/dust explosion
influencing factor
coupling
作者简介
第一作者:郭佳琪(1997-),女,硕士研究生,guojq1997@home.hpu.edu.cn;通信作者:裴蓓(1982-),女,博士,副教授,smart128@126.com。
