BAIJIAN - Third party testing organization
The total resistance of mine ventilation refers to the total frictional resistance and local resistance of various branches along a path (airflow route) from the inlet air wellhead to the return air wellhead、 abbreviated as the total resistance of the mine
The total resistance of a mine is expressed in hm. For mines with two or more main ventilation fans operating、 the ventilation resistance of the mine should be calculated separately based on the system served by each main ventilation fan. During the service life of the main ventilation fan、 the total resistance of the ventilation system will also change as the coal mining face and mining area are replaced. In order to ensure that the main ventilation fan can meet the needs throughout the entire service life and has high operating efficiency、 it is necessary to analyze the changes in the total resistance of the system at different periods during the service life of the main ventilation fan according to the development and mining layout and the replacement arrangement of the mining face、 When the maximum total resistance route is directly determined based on air volume and tunnel parameters (cross-section、 length、 etc.)、 the total resistance of the mine can be calculated based on the resistance of the route. When it cannot be directly determined、 several possible maximum routes should be selected for calculation and comparison、 and then the total resistance of the mine during that period should be determined
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