Mine Ventilation Control By Using A Transition Diagram Of Airflow Rate

In order to keep good air condition in any specific branch such as coal face and/or heading in an underground coal mine, effective factors of all the branches with respect to the specified branch have been investigated, using computer simulation. Main results of the paper are as follows; 1) A branch in a network is classified to one of three classes of effectiveness to increase, to decrease and not to change airflow rate in the specific branch by altering aerodynamic resistance in the branch. 2) Distribution of position of branches, belonging to each class, related to a specific branch is one of the macroscopic characteristic of a network which is the inherent property of every network. 3) A relation of the aerodynamic resistances of any two branches to keep a constant airflow rate in the specified branch is shown as a monotonous curve. 4) Ventilation transition diagram with the rate of airflow in the two branches as coordinates, and for different rates of airflow in the specific branch as the parameter, is found to be straight lines. 5) Existing range of airflow rates In the specified branch is given as a parameter in the enclosed area in the ventilation transition diagram. Moreover, an expert system to assist ventilation control using a transition diagram of airflow rate is introduced in this paper.