Study On The Dynamics Effect Of Gas Explosion In The Mine Ventlitation Network

On the statistics and analysis result in recent 10 years, the death over hundred reasons of coal gas explosion catastrophic in coal mine is the destroyed ventilation system by the explode shock wave, which changed the nodes energy distribution and caused air flow disorder, which make the high temperature and poison gas spread in ventilation system directly. So it is very important to study on the dynamic effect of gas explode in ventilation network.1) On the theory of disaster spreading network, the dynamic characteristic of gas explosion disaster spreading in ventilation network was studied. The characteristic of explosion shock wave was analyzed by the theory of explosion mechanics and explosive dynamics, and the overpressure degenerating formula in the tunnel was amended with the experimental result, which make the theoretical results practicality. Combined with graph theory, the model of gas explosion disaster spreading in ventilation network was built up.2) Different nodal point of pipeline model (crossing, bifurcation, gradual change, etc) was designed and experimental without ventilation, and the attenuation coefficients were given.Comparing the attenuation coefficitens of different nodal point them of pipe network are lower than pipeline. So it is unreasonable to use it in the ventilation network.The designed and experimented of different air speed (from 0 to 24.1m/s) in the pipeline (L=6m,D=160mm) shows that the direction and speed of wind affect the attenuation coefficiten, and in headwind pipeline, the wind speed is more bigger, the attenuation coefficient more fast, and in wind,the wind speed is more bigger, the attenuation coefficient more slower.3) With the graph theory and ventilation network theory, node airflow balance equation and loop wind pressure balance equation were amended, so the mathematical model for calculating ventilation network is constructed during gas explosion. Based on disaster control theory and network theory, the characters of key nodes and community structure of ventilation network were studied, and the model of judging key nodes and community structure were set up, which provides an important technical support for controlling harmful gas spread in the mine ventilation network.4) Mine ventilation net work simulation technology is studied, and the simulation and decision support system is developed and used in Xieyi coalmine successfully for simulating gas explosion, which a good effect is got. Figure [104] table [25] reference [123]...