Study On The Reliability Of Ventilation Network Structure In Mine

The mine ventilation network is the abstract expression of mine ventilation system. It is necessary to study the mine ventilation network structure to ensure the airflow stability in mine. Firstly, the thesis has made a necessary expatiation of nowaday's study on mine ventilation network briefly.According to the analysis of characteristics of mine ventilation system and the airflow flow regulations in mine, the thesis ascertains four primary factors which influences the stability of mine ventilation airflow, including ventilation network, mechanical ventilation power, natural wind pressure and the gushing of nocuous gases such as methane. It analyzes the influence of natural wind pressure and diagonal branches to ventilation network.In combination with the theory of mine ventilation mensurating pressure system and the type of mine ventilation system, the mine ventilation network is separated. With the calculation and analysis of relative wind pressure matrix and analyzing matrix of mine ventilation system, the thesis ascertains the pressure distribution and the changing of relative wind pressure of each segment and then educing the airflow stability of each segment. The airflow stability degree of each branch has been got through calculating the airflow power index. Studying the unstable airflow branches which are got according to airflow power, it ascertains airflow stability of the spot using fresh air in mine according to the connective relation with other branches in mine ventilation network and also combines with Jiangzhuang coal mine ventilation network to study.