Study Of Reliability Of Ventilation System During Mine Fire Period

The dissertation is one of the components of state "the tenth five-year plan" technical tackle key problem project whose name is "study of appraisement of safety and reliability and decision-making technologies of mine ventilation system" (number: 2001BA803B0415).While studying reliability of ventilation system, air quantity failure rather than air quality failure is the study emphasis, considering the state, I study airflow reliability of road in the dissertation, it is pointed out that if we say the airflow of one roadway is reliability, it must meet air quantity constrained conditions and air quality constrained conditions. A more strict and applied definition of airflow reliability of roadway is put forward, the distribution laws of air quantity, concentration of dust, concentration of gas and temperature of roadway are studied as well, at the same time a theoretic computation expression of airflow reliability of roadway is given.At present, one of the most popular algorithms for computing the reliability of large-scale and complex network is based on the disjoint minimum path set, but if the scale of a network is fairly big, the computational complexity will turn to be too huge, so such algorithms can not be used to compute the reliability of very-large-scale ventilation network. A new algorithm, whose name is disjoint minimum path set method based on truncation error theory and network simplification technology, is put forward in the dissertation, and the new algorithm can be used to compute the reliability of very-large-scale ventilation network.The indexes of sensibility and reliability are used to carry out quantitative analysis to the stability and reliability of diagonal branches and the influence of the existence of diagonal branches on the stability and reliability of ventilation system. According to the analytic results, a conclusion can be drawn that diagonal branches themselves are not stability but the existence of diagonal branches can make the stability and reliability of ventilation system be boosted.The reliability of ventilation system during mine fire period is simulated and the capability of resisting cataclysm of ventilation system during mine fire period is evaluated by using comprehensive assessment method based on fuzzy mathematics.Based on the computing of sensibility of reliability of ventilation system, the concept of graded management to roadway is advanced.Ventilation system is a complicated and dynamic process, windage resistance failure can lead to airflow failure, the variable relationship of air quantity with air quantity can be analyzed by sensibility analysis theory, while the failure degree has to be measured by ventilation simulation software, so a complex analysis procedure of the reliability of ventilation system based on the integrating analysis of airflow failure, windage resistance failure, sensibility analysis and ventilation simulation is advanced in the dissertation.