Ventilation Optimization for Multi-Level Mining Based on Global Ventilation Network Simulation

Abstract

Multi-level mining caused confusion of air return of overall ventilation system in Jinshandian Iron Mine. Based on fluid simulation software ANSYS-CFX, a modeling method of replacing fans with negative pressure section was proposed to build accurate 3D global model of mine ventilation network. Four feasible ventilation network optimization schemes were proposed. Airflow speed of inlet and air pressure of outlet was simulated in each scheme. To the principle of minimum ventilation energy, the scheme of return air through out3 and-270m level was determined as the optimal scheme. Using orthogonal experiment, three factors and three levels of variance analysis of airflow speed in each return air shaft was carried on. The functions of negative pressure of fans to airflow speed of outlet was built to calculate the optimal negative pressure parameter of each fan, which could realize the optimal allocation of air quantity and pressure in ventilation system.