Simulation Of "2·22" Accident In Tunlan Mine And Research On The Spread Of Explosive Air Mass

In order to study the dispersion of toxic and harmful hot gas mass in mine system domain after gas explosion,and the complex tracks of the air mass,the problem that the propagation path is unpredictable,taking the "2·22" gas explosion accident in Tunlan Mine as an example,in view of the explosion impact after gas explosion,the explosion-proof door of Liangzhuang return air shaft was opened,which led to great changes in underground ventilation system.The failure of main ventilator in Liangzhuang led to the failure of return air shaft,which made toxic and harmful high-temperature air masses disperse and migrate unpredictably underground,and led to a large number of casualties due to poisoning by toxic gas masses.In order to obtain important parameters such as CO concentration,residual oxygen concentration and initial temperature in the hot gas mass after gas explosion,which are taken as the initial conditions of simulation,the methane concentration in the explosion chamber is changed to 10%,11% and 12% by using a small pipeline gas explosion simulation experimental platform,and the test is carried out under the premise of the same other environmental factors.The average initial concentration of CO gas is 3182 ppm,the average initial concentration of residual oxygen is 2.5%,and the average initial temperature is 900 ℃.Based on the measured data of ventilation resistance in Tunlan Mine,the Auto CAD simulation model of space network system in Tunlan Mine was established.Using TF1M3 D software,The ventilation conditions at that time and the mine ventilation system under the mine field development environment were simulated,after fitting the simulation data with the measured data of ventilation resistance,it is basically consistent with the measured data.Compared with the measured results,the maximum simulation error is less than 3.9%,which can better reflect the ventilation system state of Tunlan mine.The established mine simulation model can provide a basis for the repetitive simulation of "2·22" gas explosion accident in Tunlan Mine,and the simulation results have high accuracy.Through the recurrence simulation of "2·22" gas explosion accident in Tunlan Mine,the migration and spread track of CO anoxic hot air mass produced by explosion in the mine network domain is obtained under the joint action of fan downtime in Liangzhuang return air shaft and normal operation of other three fans.The simulation results show that before the fan of Liangzhuang return air shaft resumes ventilation,CO air mass spreads widely along with the mine ventilation system in the mine network domain,and invades Shijiahe area and Houfengpingling area;After restoring ventilation,the disaster airflow in the mine network domain will change its propagation direction and cause two harms to 12403 and 12405 working faces;Lead to the aggravation of disasters and the expansion of transmission scope;The concept of CO gas emission efficiency is put forward,and different CO gas emission efficiencies are compared.The simulated disaster propagation law is consistent with the actual situation.Based on the lessons learned from the accident,the emergency plan for people to escape and reduce the spread of disasters is given,which is summarized as the emergency plan measures of "first isolation,then recovery,and two quick memories",providing reference for the emergency plan after mine gas explosion.The simulation study of "2·22" gas explosion accident in Tunlan Mine is a new attempt to predict the disaster process,scientifically formulate the pre-plan measures,and realize the disaster avoidance and mitigation scheme,which provides research ideas and directions for further study on the underground propagation of CO air mass.There are 26 figures,11 tables and 71 references in this thesis.