Research On Optimization And Monitoring Early Warning Of Complex Ventilation System Based On Ventsim

The ventilation system is one of the main production systems in the mine.A safe,efficient and economical ventilation system plays an important role in ensuring the safe production of the mine.With the deepening of the mining area and mining level,the mine ventilation system is also constantly changing.Dongtan Coal Mine has a high degree of modernization.Since the well was built in the 1980s,it has always maintained a high level of production and efficiency.The mining depth is large,the mining range is wide,there are many ventilation lines,and the ventilation system is becoming more and more complicated.In order to solve the problems existing in the complex ventilation system,the monitoring and early warning level of the ventilation system is improved.In this paper,a variety of research methods such as theoretical analysis,field measurement,and simulation are used to carry out research on the optimization and monitoring and early warning of complex ventilation systems based on Ventsim.Firstly,by analyzing the air flow law of the ventilation system,the network solution principle and the characteristics of the complex wind network,the optimization calculation method of the complex ventilation network is analyzed,and the reliability theory of the ventilation system wind network is studied.The ventilation resistance of the whole mine in Dongtan Coal Mine was measured,and the main problems of the complex ventilation system were clarified,including the existence of "Zigzag" return air,high resistance in some roadway sections due to long-term disrepair,and the proportion of resistance in the return air section too high,the air supply route is too long,etc.Then,Ventsim three-dimensional ventilation simulation system software was used to establish a three-dimensional simulation model of the ventilation system of Dongtan Coal Mine.The results of various optimization schemes of the ventilation system of Dongtan Coal Mine were calculated through simulation,which greatly shortened the network calculation time and realized the current ventilation situation.Three-dimensional dynamic visualization,through the economic and technical comparison of each plan,determined the best optimization plan:to reduce the "Zigzag" return air,expand the high-resistance roadway sections of the first air return airway in the east wing and the second air return airway in the east wing,and adjust the first air return airway in the east wing and the second return airway in the east The roadway on the downwind side of the wind airway is a three-circuit roadway.Finally,considering the overall complexity of the complex ventilation system,a safe zoning method is proposed,and the ventilation system of Dongtan Coal Mine is divided into five safe partitions.On the basis of secure partition,the method of selecting key branches is studied.Through logical analysis of the mine ventilation system,20 key branch roadways were identified.The method of spot monitoring is used to fit the data through MATLAB.Based on reliability theory,the characteristics of normal distribution of air volume,the early warning index values of key branch and key measuring points are determined,and the safety monitoring system is upgraded and applied.The research results in this paper can provide technical support for mine safety production,and have certain practical and theoretical significance for promoting research on network optimization and monitoring and early warning of complex ventilation systems.