复杂采空区条件下井下通风系统模拟仿真与优化

Simulation and optimization of underground ventilation system under complex mined-out goafs

庙岭金矿井下采空区规模庞大,大量的废弃巷道和未处理采空区,导致井下通风风流紊乱、漏风量大、通风效果差、主扇运转效率低。基于变权重与可变模糊集耦合模型对现有复杂采空区进行了稳定性风险评估,通过对安全风险较大的采空区进行充填治理、对风险一般的采空区和废弃巷道进行封闭,大大减少了漏风和串风现象。增设459 m平硐作进风通道,将原单翼对角式通风系统优化为双翼对角式通风系统,大大缩短了通风线路,改善了进风质量。基于Ventsim的矿井通风网络模拟与仿真,解算了容易时期和困难时期机械通风所需的风压。在充分利用现有风机和新增少量采掘工程的基础上,有效改善了风流质量,保障了通风效果,节约了系统改造投资成本。

The large scale of mined-out goafs in Miaoling Gold Mine where many abandoned roadways and goafs yet to be dealt with leads to disturbances of air flow,large volume of air leakage,poor ventilation effect and low operation efficiency of the main fan in underground ventilation.Based on the coupling model of variable weight and variable fuzzy set,the stability risk of the existing complex goafs was evaluated.By backfilling the large scale goafs of high risks and closing the goafs and abandoned roadways of average risks,the phenomenon of air leakage and cross-wind was greatly reduced.The adit on 459 m was added to serve as a new air inlet passage,which optimized the original single-wing diagonal ventilation system into a double-wing one,effectively shortening the ventilation line and improving the air quality.The ventilation network simulation and calculation were conducted based on the Ventsim,the wind pressure required for mechanical ventilation in easy and difficult ventilation periods was calculated.On the basis of fully utilizing the existing fans and adding a small amount of excavation works,the simulation and optimization have effectively improved the air flow quality,ensured the ventilation effect and saved the renovation investment.