Study On The Gas Migration Of "One Intakes Two Return" Ventilation

This paper has studied gob gas concentration, gas migration law based on U-ventilation, "one intakes two reture" Y-type, "one intakes two reture" U + L-type, "one intakes two reture" U + G model that is U and gob fracture zone with high gas return airway (often talk about high gas drainage tunnel), after theoretical analysis, computer simulation parameters, and computer simulation and similar experiments.Through theoretical analysis and practice, as Shaqu 14205 mechanized mining Gob of data, described the form of mined-out area, determined mined-out area "vertical three-zone" height and "horizontal three-zone" length; described the Gas Emission Factors of the fully mechanized mining face and Gob , and carried out various parts of the prediction of gas emission; from mined-out area of non-homogeneous anisotropic porous media to study the mechanism of gas migration,studied the decisive factor of gas transport in this medium: Gas pouring the various parts of the source, porosity, viscous drag coefficient to determine the flow of gas and airflow differential equations.Established a fully mechanized coal mining face of the geometric simulation of gas transport maps and simulation parameter table, in order to simulate realistic and boldly, it simulated using FLUENT for U-ventilation, "one intakes two reture" Y-type, "one intakes two reture" U + L-type, "one intakes two reture" U + G model that is U and gob fracture zone with high gas return airway (often talk about high gas drainage tunnel), got different than the real response to the actual state of the gas concentration flow,gas migration law chart and graph in all directions through the gas concentration data for export and sorting table, more specific shows the "one intakes two reture" face ventilation systems that gas concentration distribution and migration law.Through the similar material experiments about the numerical simulation of the ventilation systems, using colored smoke bomb which released the gas as a tracer gas to conduct the experiment and photographed the gas flow diagrams, compared the computer simulation of the map and the actual experiments, found the conclusions are basically the same.This more than done, we had a more specific understanding of "one intakes two reture" face ventilation systems gob gas flow, and had a certain reference value In actual production.