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Common sense of coal mine safety -- basic knowledge of ventilation
Release time:
2022-11-23
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Common sense of coal mine safety -- basic knowledge of ventilation
(I) underground air
Underground air is the general name of the gas in the underground roadway. It includes the ground into the underground atmosphere and the underground has.Poisonous and harmful gases. Ground air is the main source of underground air, mainly composed of oxygen, nitrogen, two oxygenCarbon is a mixture of three gases, generally 20.96 per cent oxygen, 79 per cent nitrogen and 79 per cent carbon dioxide.O.04%. In addition, there are a small amount of water vapor, microorganisms and dust in the underground air.
The Coal Mine Safety Regulations stipulate that the composition of underground air must meet the following requirements:
(1) in the intake air flow of the mining working face, the oxygen concentration is not less than 20%, and the carbon dioxide concentration is not moreO.5%.
(2) The concentration of harmful gases shall not exceed those specified in Table 2-1.The allowable concentration of methane, carbon dioxide and hydrogen shall be in accordance with the relevant provisions of the Coal Mine Safety Regulations.
The concentration of all gases in the mine is calculated as a percentage of volume.
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