Study On Gas Distribution Characteristics And Emission Technology In Closed Tunnel

Due to the requirement of production and safety management, there are many Enclosed or semi-closed space in coal mine. Because of these ubiquitous closed roadway, prevention and control of all kinds of accidents caused by closed roadway is a significant task of safety production. Studying the mechanism of gas accumulation, discussing Gas accumulation condition of closed roadway and its emission technology of coal mine is of great practical significance.This paper, based on the theoretical analysis, combined with experimental research and numerical simulation, make research of gas dynamic distribution characteristics and its emission characteristics of closed roadway.First of all, the gas drainage technology of closed roadway which is now widely used at home and abroad is analyzed, besides, the research results of gas distribution, gas drainage parameters and technology is summarized.Secondly, the similar simulation is established by gas concentration migration test system in closed roadway to determine the main influence parameters, according to the experiment, the gas concentration attenuation coefficient, gas density distribution characteristic and gas drainage parameters are obtained.Finally, through establishing a closed mathematical model of gas migration in closed roadway, make simulation analysis of concrete closed roadway on the computer by using closed roadway seepage field gas migration simulation program, the software FLUENT used is good at unifying the simulation and experiment results of gas migration in closed roadway. The research results provide reliable theoretical basis for the gas control in closed roadway and also put forward gas density distribution and Safety drainage technology research program aiming at Wangjialing coal mine.