压入式通风掘进巷道粉尘悬浮运移规律研究

Study on dust suspension law in driving roadway with forced ventilation

为改善煤矿掘进工作面产尘量高、煤尘浓度大、作业环境恶劣等问题,根据气固两相流理论,基于Fluent数值仿真软件,建立掘进巷道几何模型,并选用标准k-epsilon湍流模型以及离散相模型(DPM),对压入式通风掘进巷道在不同风筒出风口风速及风筒位置下的空气流场和粉尘悬浮运移规律进行数值模拟研究。结果表明:随着风速的增大,风流速度主要集中于压风筒下侧及其对角处,并在x=3 m处逐渐形成涡流区域;粉尘悬浮时间减短,巷帮及巷道顶底板捕捉粉尘量增大,巷道出口排尘速率及排尘量增大;随着风筒与工作面距离增大,粉尘扩散严重,悬浮时间增长,轨迹紊乱程度增加,巷道出口排尘量减小,影响了通风除尘效率。

In order to improve the problems of high dust production,high coal dust concentration and poor working environment of workers in coal mine heading face,according to the theory of gas-solid two-phase flow and based on Fluent and other numerical simulation software,we establish the geometric model of driving roadway which is more consistent with the field practice.The standard k-epsilon turbulence model and discrete phase model(DPM)are used to simulate the air flow field and dust suspension movement law of the forced ventilation tunneling roadway under different wind speed and positions of the air duct outlet.Research shows that the wind velocity mainly focuses on the lower side and diagonal of the pressure air duct with the increase of wind speed,and gradually forms a vortex area at x=3 m.The suspension time is shortened,the dust captured by the roadway side and roadway roof and floor increases,and the powder discharge rate and dust discharge at the roadway outlet increase.With the increase of the distance between the forced air duct and the working face,the diffusion is serious,the suspension time increases,the degree of trajectory disorder increases,and the dust discharge at the roadway outlet decreases,which affects the ventilation and dust removal efficiency.