Study On The Disaster Evolution Of Ventilation System And Countermeasures Of Mine Reverse-wind For Disaster Control In The Mine Fire Period

Underground fire,gas outburst and other accidents,resulting in ventilation system disorganized,the spread of toxic and harmful gases will endanger the safety of underground workers.Through the study on the simulation of mine ventilation system of disaster period,effective ventilation system control project is obtained,artificial controlling poisonous and harmful gas migration process,in order to achieve the purpose of reducing casualties.Through theory,experiment and simulation,this paper studies the disaster evolution of mine ventilation system in fire period and countermeasures of reversing mine air current.Using the node method for ventilation network,the node of the fan air pressure as solving the problem of variable into a node of the fan fan powered as solving the problem of variable,and then through the node list nodes fan wind pressure equation of conservation of flow.The four basic elements of fan node,constant pressure node,constant current roadway and ordinary node are taken as research objects,a modeling method describing arbitrarily complex mine is obtained through the above four basic objects.By using the SOR iteration method to solve the initial value system of the node wind pressure,the relaxation factor w is selected as 1.1 for the fast calculation speed and high accuracy.Based on the existing circuit method numerical test in this paper,the correctness of the method to establish the nodes of the wind pressure equations and convergence condition are verified.when the initial value of branch flow fan association branch fan is less than the maximum air volume and greater than zero,the iterative calculation of the wind pressure equations of the node is convergent.Experiments of diffusion parameter for fire smoke gas migration are carried out taking CO2 as the main the research object.And the experimental results are used for parameter inversion to obtain the dispersion deviation coefficient of fire smoke under different wind speeds.The fitting equation is an important calculation parameter for the diffusion process of smoke flow during the mine fire period.The transformation logic of 3D mining map based on advanced programming language is presented,and the function design of interactive modeling and modifying mine map information is studied.For mining CAD figure of the mine ventilation network data extraction in the study,can get fast to ventilation network modeling method.The code flow chart of the representative function module and the database design scheme of the disaster ventilation simulation software are presented in accordance with the three main paradigms of the database.A method of judging the correctness of simulation results of unsteady state catastrophic ventilation is put forward.Using triangular network model and large mine model of fire smoke flow,the natural wind pressure calculation and pressure wave propagation calculation of fire smoke flow are verified respectively.By simulating the distribution of concentration and pressure,the correctness of natural wind pressure calculation and pressure wave calculation based on ventilation network is judged.TF1M3D software was used to simulate the fire accident of Xinghua mine in multi-fan mine.Fire simulation results show that the underground worker can't evacuate safely when the self rescuer is available for a long time.In order to ensure the safety of workers in the east area,we should make an mine reverse-wind plan for Xinghua mine.Through a large number of different wind fans with different parameters of the reverse-wind combination,four effective mine reverse-wind schemes are obtained that can guarantee the safe evacuation of the workers in the east mining area while ensuring that the workers in other mining areas are not affected by smoke.