Xutuan coal mine to start construction began in May 1997210, 2004207 month joint commissioning, 2,004,211 monthly production. The annual designed production capacity is 1.5 million tons, and it will reach 3 million tons after expansion and expansion. The mine mainly mines 71, 72, 82 and 32 coal seams, of which 71, 72 and 82 coal seams are arranged jointly, and 32 coal seams are arranged separately. The mine ventilation mode is a central boundary type and is a high gas mine. The elevation of the main, auxiliary and wind wells of the mine is +27m, the first level upper limit is -380m, the lower limit is -500m, and the mine geothermal gradient is 2.67°C?100m. In the plane position, the main and auxiliary wells, the main stone gate, the 3 uphills of the 82 mining area and the central boundary wind well are located on the same straight line. From the construction of the well to the commissioning and reconstruction and expansion, the Xujing coal mine has been greatly excavated from the main well and the central boundary wind well at the same time to the main well, the wind shaft through, and the 33 mining area of ​​the reconstruction and expansion project. It has undergone a transition from a temporary ventilation system to a permanent ventilation system. During this process, the overall and local ventilation systems of the mine have undergone great changes, and various ventilation methods have been adopted.
1 Long-pumping and short-pressure ventilation during the construction period. After the construction of the central boundary wind shaft and the twisting, two axial-flow ventilators are installed on the wind well floor, one for use and one for standby. A Φ600mm iron air duct is installed in the shaft of the wind shaft, and a three-way leading to the head is provided at the lower end of the wind shaft. Each head is equipped with a local fan to press the ventilation face into the working face, and the return air of each head is pumped to the ground through the iron duct. .
2 During the construction period, the underground ventilation warehouse was used to implement the relay ventilation. The main and auxiliary shafts were connected at the bottom of the well and the bypass construction of the bottom and bottom yards was completed. Two wind turbines were installed in the industrial square, one for operation and one for standby. A Φ700mm iron air cylinder is arranged in the main wellbore. Select a section of the single lane in the bypass of the bottom of the well, and build a damper at the entrance of the tunnel, which is the temporary wind pool in the underground. Extend the iron air cylinder in the main well to the wind pool, press the wind into the wind pool, install a local fan in the wind pool, supply air to each head, press the wind to the underground wind pool through the ground fan, and the underground wind pool heads toward the head. Supply air and implement relay ventilation.
3 During the construction period, natural wind pressure ventilation is used. After the main shaft and the wind shaft are connected, the wind flow from the main well to the wind shaft is formed under the action of natural wind pressure. According to the actual measurement from 2004-08-16 to 17 The natural wind pressure is 81.89Pa. Even in June, when the ground temperature is high, the air volume generated by natural wind pressure can reach 2300 m3/min, and the direction remains unchanged. As the 81 mining area has not yet penetrated, the wind shaft still needs to undertake the lifting task, and it is impossible to remove the lifting equipment for permanent equipment, and the mine permanent ventilation equipment cannot be put into use. It has been verified that natural wind pressure ventilation can meet production and safety requirements while maintaining the construction of four rock tunnel headings in the underground. In order to prevent accidents, the original ventilation facilities are reserved, and practical measures are taken. That is, before the mine full-pressure ventilation system is not formed, it is strictly forbidden to enter the coal roadway construction and strengthen the observation of the mine ventilation.
4 During the production period, the full-wind pressure of the mine is utilized. After the local tandem ventilation is put into operation, the return air of the upper yard of the mining area under the newly-expanded mining area 82 is connected to the 7126 working face, because the excavation head opening position is located in the upper part of the 82 lower mining area. Near the parking lot, it is only 280m away from the 82 windward uphill, and there is a wind bridge connected. There is a windshield wall near the door of the wind bridge. The pressure difference between the two sides of the windshield is measured by the ventilation resistance of the underground mine in 2004208. 771.11Pa, so the double-channel á600mm iron air duct is used to directly introduce the return air into the 82 recovery area and return to the wind to solve the problem of series ventilation, and give full play to the full wind pressure of the mine.
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