Double-U ventilation system for fully-mechanized caving coal working face

Abstract

The invention relates to a U+U-shaped ventilation system for a fully mechanized top-coal caving working face, comprising a coal seam floor, a coal seam roof, an air inlet trough arranged along the coal seam floor, a tape trough, a return air chute, a mining face, and a ventilation system. The connection roadway, the gas discharge lane, the auxiliary transportation roadway in the mining area, the air return roadway in the mining area, the stop production line of the working face, the damper, the damper adjustment, and the gob are composed of an external U-shape and an inner U-shape. The U-shaped ventilation system is connected by several connecting lanes in the middle, which makes the ventilation and gas discharge more effective. The layout of this ventilation system is advanced in plane design, which improves the ventilation effect and effectively reduces the gas return corner of the fully mechanized top coal caving face. The number of times of exceeding the limit reduces the stoppage time of the working face caused by the return air corner of the working face exceeding the limit, thereby increasing the mine production and ensuring production safety at the same time.

Description

technical field [0001] The invention relates to a U+U-shaped ventilation system for fully mechanized top-coal caving working faces in thick coal seams, and belongs to the technical field of layout methods and ventilation settings for fully mechanized top-coal caving mining faces in thick coal seams. Background technique [0002] At present, more than 90% of the thick coal seams above 5 meters are mined by fully mechanized top-coal caving method. This method has the advantages of simple production process, high production efficiency and large output, but there are also problems such as large coal loss and low coal recovery rate. In particular, hidden dangers such as large coal seam gas content, high coal dust concentration, and coal spontaneous combustion seriously threaten the safe production of the working face; reasonable roadway layout and ventilation system are the most effective way to solve the problem of gas, coal dust and coal spontaneous combustion in the top coal ca...

AI Technical Summary

Problems solved by technology

[0006] However, the production practice shows that although the U+L ventilation system alleviates the threats to production caused by the gas overrun in the bottom coal cutting face and the gas accumulation in the corner of the return air to a certain extent, it also requires the construction of a large number of connection roads, which increases the roadway excavation. The amount of work, the large number of facilities in the connecting lanes cause large air leakage, which increases the difficulty of ventilation system management, and the maintenance engineering of the gas drainage lanes, connecting lanes and return air corner passages within the top cutting line is large, which reduces the coal recovery rate in the mining area

[0007] Although the U+I type ventilation system can effectively reduce the number of gas overruns in the return air corner of the working face, and does not require the construction of a large number of connecting roadways, the cross-section of the roadway is relatively small, saving a lot of roadway engineering, and at the same time, it can also improve resource recovery. However, due to the advanced pressure of the working face, the roof of the gas discharge roadway is easily deformed or even blocked, resulting in the failure of the gas discharge roadway; the gas discharge roadway has little effect on the deep gas in the goaf, and the roof of the goaf will cause pressure. High-concentration gas gushes out from the gas discharge lane or the corner of the return air; the floor of the gas discharge lane often collapses and cuts through, which causes the gas concentration in the return air corner and the rear triangular area to exceed the limit and affect production

[0008] Although the J-type ventilation system provides a ventilation method of one inlet and two loops, it is necessary to install a triangular bracket in the goaf to reserve the roadway, and communicate with the specially set water discharge lane through the channel reserved in the goaf; this ventilation system is used in the goaf On the one hand, it increases the maintenance cost, on the other hand, it is necessary to arrange the water release roadway and the mining conditions that are suitable for the layout of the water discharge roadway

Images