支路风筒布局对掘锚一体机粉尘运移规律影响研究

Research on influence of branch air duct layout on dust transport law of excavating and anchoring machine

随着掘锚一体机理论与装备技术的发展,煤矿“采掘失衡”难题逐渐解决。但是综掘工作面大多采用传统通风除尘方法,高强度截割导致粉尘危害严重。为了从粉尘源头位置减少掘进截割粉尘的扩散,提出通过增加支路除尘风筒的新方法以改善掘进工作面的粉尘高浓度状况。利用数值模拟方法研究了不同数量的支路风筒对掘进巷道流场结构、粉尘运移状态和浓度等粉尘特征参数的影响规律。结果表明:单一较大横截面积的风筒能有效吸收从掘进机上方流向巷道后方的粉尘;支路风筒可以有效吸收所处位置的粉尘,阻止粉尘颗粒从掘进机两侧向巷道后方扩散。

With the development of the theory and equipment technology of the excavating and anchoring machine,the problem of“unbalance between mining and excavating”in coal mine has been solved gradually.However,most of the comprehensive excavation faces adopt the traditional method for ventilation and dust removal,and the high-intensity cutting leads to serious dust hazards.In order to reduce the diffusion of dust caused by excavating and cutting from the source of dust,a new method by adding branch air duct for the dust removal was proposed to reduce the high concentration of dust in the excavation face.Then,the numerical simulation method was used to study the influence of different numbers of branch ducts on the dust characteristic parameters such as flow field structure,dust transport state and dust concentration in the excavation roadway.The results showed that the air duct with a single large cross-sectional area could effectively absorb the dust flowing from the upper part of the tunnel boring machine to the rear of the roadway.The branch duct could effectively absorb the dust at the location and prevent the dust particles from spreading from both sides of the tunnel boring machine to the rear of the roadway.