Numerical Analysis Of Water Mist Two-phase Flow Field For Gas Explosion Suppression In The Colliery Main Ventilation Tunnel

Gas explosion at home and abroad in the prevention and control research has had great results, but involves the three elements in the gas explosion at the same time, the studies of the new technologies under the control of coal mine gas explosion was small. More previous studies based on to reduce the concentration of methane gas in accumulation zones or use of chemical fire extinguishing agent as Halon 1301,1211. The water mist Studied in this paper has a particle diameter of extremely small, a spatial distribution of dense and uniform, a long residence time in the air characteristics, and have the effects of highly efficient heat absorption, choking fire, radiant heat barrier, kinetic effects, etc. in gas explosion suppression process, and has economic environment, can be applied in the commonly gas concentration zones and the gas accumulation zones which is difficult to reduce the concentration of methane gas. But at present, water mist fire suppression and explosion inhibition industry is still dependent on a large number of tests to the development of water mist fire suppression and explosion inhibition system. Therefore, the influence study of the water mist spread and particle diameter that gas explosion suppression required under water mist gas explosion suppression system layout and the various factors, has an important significance.In this paper, the process of research on the straight laneway and the upper corner of the main ventilation tunnel builded the physical model, used the method of theoretical research, numerical simulation, experimental validation, studied the relationship among gas explosion suppression water mist system and its influencing factors, and then experiment to test and validate the findings. In the straight laneway and the upper corner, by means of Fluent software, studied the relationship among influencing factors such as the number of nozzles, spray angle, the number of nozzle row, laneway obliquity, the wind speed of laneway, the high degree of landway and the water mist content, the water mist spread, provided a reliable basis for gas explosion suppression water mist system layout in the mine main ventilation tunnel. The results show that the mine main ventilation tunnel can be arranged in a suitable gas explosion suppression system to achieve the goal that provide the water mist flow for the satisfaction of the requirements of the gas explosion suppression.