煤巷掘进过程中粉尘浓度影响因素分析

Anlysis of dust concentration influence factor in coal roadway driving

为了掌握煤巷掘进过程中粉尘浓度变化的影响因素,根据气固两相流理论,针对矿井掘进工作面的特点,采用计算流体力学的离散相模型(DPM)考察了掘进巷道风速、风筒直径、风筒出风口到掘进工作面距离以及风筒的悬挂高度对粉尘浓度变化的影响。结果发现:当掘进巷道风速为0.25-4 m/s时,提高巷道内的通风风速,可以降低巷道内的粉尘浓度,缩短呼吸性粉尘浓度达到稳定的时间,减小工作面粉尘的危害;有利于通风除尘的风筒相关参数为风筒直径0.4-0.6 m、风筒出风口到掘进工作面距离6-7 m、风筒悬挂高度2.0-2.2 m。

For gripping the influence factor of the dust concentration in the coal roadway driving,based on the theory of two-phase flow of gas and solid,and the characteristics of coal mine driving working face,using the Discrete Phase Models of computational fluid mechanics to simulate the velocity of ventilation in coal roadway driving,of dust concentration,diameter of air duct,the distance between the air duct exit and driving working face,the hanging height of air duct influenced to dust concentration.The result showed that,when the velocity of ventilation in coal roadway driving was 0.25-4 m/s,increasing the velocity of ventilation in the roadway may reduce the dust concentration in the roadway, shorten the time that respirable dust becoming stabilization,and reduce the harm of dust in the working face.The parameter that in favor of ventilation and remove the dust was diameter of air duct 0.4-0.6 m,the distance between the air duct exit and driving working face 6-7 m,the hanging height of air duct 2.0-2.2 m.