What parts does the coal mine ventilation system include?

1. Mine ventilation, three defenses: gas prevention, coal dust prevention and fire prevention; 2. Twelve-character policy of mine ventilation: pumping before mining, monitoring and controlling, and determining production by wind; 3. Mine ventilation task: 2. Provide enough fresh air for underground workers; 2. Dilute and eliminate toxic and harmful gases and suspended mine dust, so as to conform to the safety regulations of coal mines. Maintain proper working conditions. 4. The purpose of ventilation facilities: make the airflow flow according to the proposed route and maintain normal ventilation, which is directly related to the safety of the mine. 5. Classification of ventilation facilities: dampers and wind walls that block airflow. Used for wind bridges, wind tunnels, wind windows and anemometers in steering flow. The commonly used ventilation facilities in mines are: air door, sealing and wind bridge. Wind station. 6. Series ventilation: not recommended. After the airflow passes through the wind site, it will not be discharged into the return air system and enter another wind site. 7. In the intake air of the mining face, the oxygen concentration shall not be less than 20%, and the carbon dioxide concentration shall not be greater than 0.5% by volume.