| Working face goaf gas emission is one of the important sources of a large number of Wells with wind leakage, especially with the wind leakage into the goaf on the corner, the transfinite gas accumulation in upper corner, and corner on the goaf gas emission and gas control research has become an important part of the study of coal industry.This paper focuses on concentration distribution and working face goaf gas especially roadway. The problem in upper corner, and use XV1301in SiHe coal mine fully mechanized working face as the research object, through the XV1301fully mechanized coal face in SiHe coal mine gas monitoring and data collection. According to XV1301basic situation of fully mechanized working face, through the analysis of the strata lithology of mined-out area, the mined-out area is divided into three zones "horizontal, vertical three zones" and to determine the "horizontal, vertical three zones" of three each region corresponding to the source of porosity, facies viscous resistance coefficient. By XV1301monitoring data of fully mechanized working face in SiHe coal mine and related data analysis to calculate the XV1301fully mechanized working face and goaf "horizontal, vertical three zones" of three gas emission, master into the wind lane, auxiliary ventilation lane and another into imports of wind speed and wind lane primary return air lane and secondary return air lane outlet pressure, etc. Based on the analysis and the result of the XV1301f‖lly mechanized working face goaf has carried on the corresponding simplified, CFD model, simulation analysis and the if XV13013the Lord into the ventilation air volume constant XV13011auxiliary ventilation lane under the condition of air volume and XV13015another into the lane air volume ratio of2:1,3:1and4:1characteristics of goaf flow field and gas migration. Studies have shown that under the parallel double u-shape ventilation method, if XV13011auxiliary ventilation air volume and XV13015another into approximate ventilation air volume ratio is3:1, because of the Angle and its nearby area on the pressure difference is less than the secondary return air lane and the connection to the pressure difference, in the vicinity of the left corner on the working plane area with air leakage of gas to enter the connection into the secondary return air lane after another into the wind lane into the wind, and the pressure difference in the corner and its nearby area and secondary return air lane and connection in the area of pressure difference compared to fit, which will not cause secondary return air lane gas overrun. The research for the gas control and assisted the wind lane, and the other into the wind lane between air volume ratio optimization study provides certain theoretical support and practical significance.Because V13011auxiliary ventilation air volume and XV13015another into the ventilation air volume ratio of3:1approximation for the optimal air distribution ratio, so the lane in the XV13011auxiliary ventilation air volume and XV13015another into the ventilation air volume ratio of3:1, the face with a high concentration of parallel double U goaf gas area is analyzed, and then adopted in working face were determined with double u-shape ventilation in high concentration of gas accumulation area of the mined-out area. Namely along the direction of working face advancing distance of working face, between185～335m distance along the face width40m area of return air side, from coal floor height is30～50m area as high concentrations of goaf area, for the best and reasonable area of working face goaf gas extraction, in drder to prevent to face poured out of the working face goaf gas accumulation and selecting reasonable goaf gas extraction area and extraction approach provides certain theory basis. |
PDF Full Text Request