There are many factors affecting the ventilation effect. The main factors affecting the U+L ventilation effect are direct lithology, thickness, coal pillar width, network pressure difference, and Yokogawa spacing. The influence of the returning wind and the cross-flow is the most obvious. In the case of the company, the reasonable spacing of the tailway ventilation and cross-flow should be 4050m; the decisive factor affecting the Y-type gas control effect is the support mode along the empty roadway, followed by the roof lithology. In the eight mines, the 24011 working face with poor roof conditions was supported by dense sheds, and the third mine was used in the 30041 middle working face with good roof lithology. The bolts were used to maintain the column and the air volume was passed. Can be kept above 300600m3/min.
According to the test data, the average value of absolute gas emission in the 9 top coal caving faces is 8.42m3/min, only 2 in excess of 10m3/min, 13 working faces with layered mining, and absolute gas emission. The average value is 19.33m3/min, all of which is greater than 10m3/min, and the amount of gushing is 2.3 times that of the top coal working face. Therefore, from the perspective of gas control, top coal mining should be the preferred mining method in the mining area.
The plastic fan rubber injection molding machine is used for pumping gas for the non-emission gas tailgate or the tailgate, but the interval between the gas and the river is too large, and the effect is not obvious. effect. The method is to use the FSWZ-11B mining plastic extraction fan or the FSDO2@18.5 counter-rotating fan in Chongqing, and discharge the gas from the upper corner directly into the return air passage through the retractable skeleton air duct.
The field use shows that the pumping effect of the FSWZ-11B mining plastic extraction fan is greatly affected by the environment of the upper wind tunnel.
Under normal circumstances, the fan exhaust air volume can reach 130180m3/min, the discharge gas concentration is 2%3%, the discharge gas volume is 2.04.0m3/min, accounting for about 18% of the working surface gas emission. The test results are shown in Table 5. .
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