【作者】 韩超；

【导师】 刘剑；

【作者基本信息】 辽宁工程技术大学 ， 安全科学与工程， 2021， 硕士

【摘要】 井下作业环境具有空间受限、供风量有限、通风系统错综复杂等特点,特殊的作业环境决定了井下一旦发生火灾必将对矿井安全生产造成严重的威胁,也使得对矿井火灾的研究必须以整个矿井系统作为研究对象。本文以金川二矿区井下实际巷道为基础,建立了包含上行通风巷道、下行通风巷道以及水平巷道在内的典型地点巷道三维数值模型,模拟了巷道发生点火源火灾以及线火源火灾的火灾场景,分析了不同火灾场景下温度、CO的分布情况,定量得到了火灾时期巷道内产生的火风压以及火区阻力。最后,站在全域矿井系统的角度,利用FDS与MVSS相结合的方法,研究了矿井火灾时期通风系统风流状态的变化情况。对于矿井局部区域:单一巷道发生火灾后,火区附近烟气温度以及CO浓度最高,且两者呈正相关,随着烟流向下风侧方向蔓延,两者数值沿程逐渐降低,巷道出口处CO降幅较温度要小很多。对于长大巷道,尽管出风口烟气温度已经接近发火前的状态,但是CO浓度仍较高;就水平巷道火灾产生的火区阻力而言,线火源火灾的作用力要小于点火源火灾,前者的危害主要来源于烟流扩散过程中含带的CO等有毒有害气体。对于矿井全域:矿井火灾的影响范围以及影响程度受着火巷道所处位置、风路形式以及火灾规模的影响。1000m矿石运输道位于整个矿井中部水平,水平巷道,最大火区阻力66Pa;主斜坡道位于1400m水平,下行通风巷道,最大火风压481.18Pa。火灾时期全域矿井系统风流状态受影响的井巷数量分别占总数的94.56%、76.83%;前者风量变化幅度很小,影响程度几乎可以忽略,后者致使4条巷道内风流出现了逆转:1200平巷、1200副中段、主斜坡道与通风小井联络道附近以及主斜坡道与1150水平大巷联络道风量分别从1.35m~3/s、1.23m~3/s、9.49m~3/s、11.95m~3/s降至-0.46m~3/s、-0.57m~3/s、-4.8m~3/s、-1.07m~3/s。该论文有图50幅,表14个,参考文献62篇。更多还原

【Abstract】 The underground working environment has the characteristics of limited space,limited ventilation,and intricate ventilation system.The special operating environment determines that once a fire occurs underground,it will inevitably pose a serious threat to the safety of mine production,and it also makes the study of mine fire must take the entire mine system as the research object.Based on the actual underground roadway in Jinchuan No.2 mining area,this paper establishes three-dimensional numerical models of five typical locations including upward ventilation roadways,downward ventilation roadways and horizontal roadways,and simulates the fires of ignition source fire and line fire source fire in the roadway.Scenario,the distribution of temperature and CO under different fire scenarios is analyzed,and the fire wind pressure and fire zone resistance generated in the roadway during the fire period are quantitatively obtained.Finally,from the perspective of the global mine system,using the method of combining FDS and MVSS,the changes in the air flow state of the ventilation system during the mine fire are studied.For local areas of the mine:after a single roadway has a fire,the smoke temperature and CO concentration near the fire area are the highest,and the two values are positively correlated.As the smoke spreads to the downwind side,the two values gradually decrease along the way,and the roadway exits The drop of CO at the tuyere is much smaller than that of the temperature.For long roadways,although the flue gas temperature at the air outlet has dropped to the state before the fire,the CO concentration is still high;in terms of the resistance of the fire zone caused by the horizontal roadway fire,the force of the line fire source fire is less than the ignition source fire The hazards of the former mainly come from toxic and harmful gases such as CO contained in the process of smoke diffusion.For the whole area of the mine:the scope and degree of influence of the mine fire are affected by the location of the burning roadway,the form of the wind path,and the scale of the fire.The1000m ore transport road is located at the middle level of the entire mine,with a horizontal roadway,and the maximum fire zone resistance is 66Pa;the main ramp is located at the level of1400m,with a downward ventilation roadway,and the maximum fire pressure is 481.18Pa.During the fire,the number of shafts affected by the air flow status of the entire mine system accounted for 94.56%and 76.83%of the total respectively;the former has a small change in air volume and the impact is almost negligible,and the latter caused a reversal of the air flow in the 4 roadways:1200 flat The air volume of the roadway,the middle section of the 1200 sub-middle section,the main slope and the connecting road of the ventilation shaft,and the connecting road of the main slope and the 1150 level main road are reduced from 1.35m~3/s,1.23m~3/s,9.49m~3/s,11.95m~3/s,respectively-0.46m~3/s,-0.57m~3/s,-4.8m~3/s,-1.07m~3/s.There are 50 figures,14 tables and 62 references in this dissertation.更多还原