The following factors should be considered:
First, block the air leakage passage and improve the tightness of various ventilation structures. When the main air duct is severely leaking, it is necessary to take measures to prevent leakage.
Second, according to the different wind leakage conditions of the surrounding rock, different air supply methods are adopted. For the wind leakage of the surrounding rock, when the air leakage is serious, the air supply can be used. When the air leakage is serious, the air supply is used. When the air leakage is serious, the mixed air supply is used.
Third, adhere to a reasonable mining sequence. External air leakage is generally easy to find and it is easy to take appropriate measures. The internal air leakage is easy to find except for the leakage of various ventilation structures. Others such as the filling of the goaf, waste tunnels, etc. are not easy to find, and the total air leakage is large. In this case, in addition to strengthening the rigor of the ventilation structure, it is more important to adhere to a reasonable mining sequence and carefully close the waste roadway and the goaf, which is an effective measure to reduce internal air leakage.
Fourth, reduce the pressure difference of the mine, using district ventilation. For example, the original design of the Xihuashan tungsten mine in Jiangxi Province used only one press-in main-pass fan, and the air leakage was extremely serious. After changing to eight divisions according to the specific situation, the effective air volume rate has been greatly improved.
5. Reasonably choose the main fan position. The main fan is as close as possible to the wind part, which can reduce air leakage. For example, the Hunan Tin Mine moved the main fan into the underground, increasing the effective air volume rate of the central ventilation system from 30% to 88.5%.
6. Air curtains or air deflectors can be used to prevent air leakage at the wellhead.
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