Wuhu Mountain Fully Mechanized Coal Mining Face Comprehensive Technology For Gas

Gas disaster, as the most important one of five natural disasters, has been restricting the efficiency of coal mine production all alone, and seriously threatens the daily production and the safety of underground workers. In view of the increase of gas discharge volume caused by the increase of mining depth in Wuhu Mountain Coal Mine, this paper does a research in the following two aspects—gas discharge with wind and gas drainage under suction, in order to find out an effective comprehensive measure to deal with gas disasters in this coal mine. At last, it should resolve the problem of gas over limit in roadways and faces, and improve the efficiency of gas discharge.On the basis of the investigation of W-type ventilation system in working faces and the measure of air resistance in this coal mine, this paper also does a research on the ventilation network in Wuhu Mountain Coal Mine through the MVS2002 ventilation network solution software, and gets the theoretical basis for forecasting air quantity in working faces. And through the analysis of the network calculation and the reasonable distribution of ventilation resistance, it identifies the problems in this ventilation system:1, the proportion of ventilation resistance in the air intake section is high, and relative resistance distribution is unreasonable; 2, the proportion of air in working faces is less than 50%, and there is the phenomenon of air leakage in the inner of mines; 3, the air leakage out of mines is serious, and the relative air leakage rate is high; 4, the efficiency of the two fans are very low, maybe less than 60% or less. These issues are the key points of the ventilation system optimization. Here are the solutions to the problems mentioned above:1, expand the cross-sectional area of the mountain belt to a certain degree; 2, increase the air quantity in working faces through ventilation system optimization, add regulation devices in the mining areas with sufficient air, and improve the ventilation rate; 3, increase ventilators'wind tunnel, reversing airway, and nearby throttle's gas tightness to reduce air leakage; 4, adjust ventilator's angle to meet the needs of underground air quantity and improve the operating efficiency of the main fans.By measuring the coal seam gas pressure, permeability coefficient, gas content, coal composition and gas volume, attenuation coefficient and other parameters, gas reserves of the coal mine is evaluated, gas emission volume is predicted with separate resource method, and technical and economic feasibility of gas extraction is discussed. On the basis of the actual situation of gas discharge in this coal mine, method of gas drainage in both seam and gob is put forward. And at last, different projects of gas drainage directing at different area are designed and the economy of gas drainage is estimated.The paper combines the method of gas discharge with wind and gas drainage technique, and does a comprehensive treatment on the gas in Wuhu Mountain Coal Mine. It improves not only the safe productive situation, but also the safe productive efficiency in this coal mine. Meanwhile, the gas drainage technique could reduce the green house effect, make full use of gas effectively, and create obvious social, economic and environmental benefit.