In general, mines mined in a single mid-section are more likely to overcome the series flow between the working faces. For various sections of mining, certain measures must be taken. According to the practice of the mine site, the following methods can avoid or reduce the series airflow.
First, checkerboard ventilation. Mines with gently inclined, multi-middle and forward mining are prone to form a series flow in the working face. At this time, the flat road enters the wind and the patio returns to the wind. The typical arrangement is shown in Figure 1. The waste air from the working place can be introduced into the return air patio to overcome the waste wind connection in the working face. The disadvantage is that the ventilation is increased. The amount of work.
Figure 1 Checkerboard ventilation
Second, the upper and lower compartment ventilation. Lung ventilation problems in order to solve the multiple smoke iron ore mined at the same time in the middle, with the damper, wind walls, ventilation and windshield middle of the two adjacent structures, respectively inlet and return air, which is a typical arrangement shown in Figure 2.
Figure 2 Upper and lower compartment ventilation
Third, parallel double lane ventilation. The Zhongzishanzizigou Mine is a caving mining method with a bottom structure in the moderately inclined and multi-middle section. The electric roadway is perpendicular to the ore body trend, and the parallel double-passway is used to separately enter and return the wind, effectively overcoming the series wind flow of the working face. Its arrangement is shown in Figure 3.
Figure 3 Schematic diagram of double row and double lane ventilation
Fourth, comb ventilation. The Pangushan Mine is a parallel dense vein deposit, and each section of the tunnel is criss-crossed, and the fresh air and the waste wind are difficult to separate. In each section, a dedicated vein-return air duct is established, and the cross-section of the tunnel is enlarged, and the wind tunnel is divided into two compartments, one for transportation and air intake, and the other for return air; or a false ceiling Divided into two upper and lower compartments, one for transportation and air intake, and the other for returning to the wind; or with a false ceiling to divide the veins into upper and lower compartments, which are divided into inlet and return air passages. The return style is connected to the return air duct, thereby overcoming the series air flow between the working faces. Since the return air duct has a comb structure, it is called comb ventilation, as shown in Fig. 4. Wind buildings and false roofs can be built with bricks, stone, concrete, and wood.
Figure 4 comb ventilation
The above examples are based on the specific conditions of the respective mines and take corresponding measures to effectively overcome the series wind flow between the stope. These examples contain a common law, that is, in order to overcome the series flow of the working face, measures must be taken according to the specific conditions of the mine, so that the inlet air of each working face is directly connected with the fresh air flow, and the wind is directly related to the waste wind. Union.
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