Study On Optimization Of Large-complex And Restructive-expansive Mine Ventilation System

In recent,with more mining enterprises increasing the yield by restructing expanding,the mining depth,intensity and degree of mechanization,mine ventilation system and underground hydrogeological conditions will also gradually complicated,which make ventilation’s problem more prominent and seriously affect efficiency of the mine enterprise production and worker health and safety.Thus,it has a positive significance for frontline operational staff to create a safe and stable working environment and enhance the mine economic benefits that further developing restructive-expansive mine ventilation system optimization research overcome the ventilating problem of restructive-expansive mines.This paper combined scene investigation and test,the comprehensive evaluation analysis,software simulation and practical application of the method,and then optimized and transformed from the aspects of air flow control facilities,ventilation network,ventilation power,ventilation management.(1)Based on investigation,test and evaluation of restructive-expansive mine,this paper summarized common problems that fan and ventilation mine reconstruction are not matching,the installation location is not appropriate and the airflow network is difficult to control and various problems that mining method,mining depth,strata environment are different existing in expansion mine,which maked latter optimization more targeted.(2)Through theoretically deducing and analysing the model of mine air curtain with single and multi machine,increasing resistance,and air injection,this paper presented a methods that apply the mine air curtain to replace traditional airflow control facilities,which solved the problem that utilization of traditional airflow control facilities was constrained caused by pedestrians,frequent transportation or effect of blasting shock wave.The mine application results showed that the main air flow volume changed from 30.12m3·s-1 in to 4.31m3·s-1 out,which prevented the phenomenon of main shaft freezing in winter and can’t affect the normal production of the mine.(3)Applying 3D VS to rebuild dynamic management model of the restructiveexpansive mine ventilation system,can realize the self diagnosis of the air volume of the working surface,quantized influence of natural wind pressure on the ventilation system and guidance to optimize restructive-expansive project.(4)Aim at the complex characteristics of the expansion mine ventilation system,through the application of dynamic management model,this putted forward some optimization scheme,and apply catastrophe theory evaluation model to determine the economic and reasonable,safe and reliable,technically feasible optimization scheme.After the implementation of the technical proposal,the mine total quantity has increased by 84%,which increased from 261.93m3·s-1 to 431.29m3·s-1.Besides,the comprehensive evaluation index of ventilation system has increased from 37.67% to the 78.12%,and the environmental quality of underground ventilation effect and the work surface has also significantly improved.