In order to address the problem of dust pollution at the transfer point of the coal transportation system, this paper carries out a numerical simulation on the dust diffusion law of the coal transportation system. The simulation results show that the dust concentration at the three openings in the transshipment point is the highest, and the farther away from the transshipment point, the lower the dust concentration. Depending on the simulation results, a pneumatic spray dust reduction scheme can be proposed by performing a field experiment. Based on the controlling variable experiments and existing studies, the parameters of pneumatic spray can be stated in the following way: the flowing rate should be laid out at 0.7 l/min, with its air velocity being 25 m/s and the working pressure being 0.6 MPa. The entire spray scheme can be verified through the computer simulation process. Thus, it can be calculated and determined that the spray scheme should be installed with four nozzles at the anterior end of the lower belt guide trough, with one nozzle at the back end and two nozzles at the upper belt feeding point. Eventually, the scheme has to be validated by the field experiments. Thus, the consequences of the on-spot experiment and test show that the scheme we have suggested is in a position to reduce the dust concentration effectively in the entire area of the transshipment point, bringing about the dust reduction rate over 90%.

为解决矿井胶带运输巷粉尘质量浓度超标问题,设计一种新型节能气动喷雾降尘方案.在3 m/s通风条件下,采用数值模拟方法研究胶带运输巷粉尘运移情况,模拟粉尘从导料槽喷出至污染整个胶带运输巷的过程和粉尘速度的空间分布;提出同时治理导料槽和胶带运输巷内的中心抑制、两侧隔断综合喷雾降尘方案;在导料槽两端布置安装6个新型节能气动雾化喷嘴,胶带运输巷布置4道由高效节能气动雾化喷嘴组成的雾幕.结果 表明:该方案可有效降低导料槽粉尘涌出量,并对胶带运输巷中的粉尘起到捕集和隔断扩散作用;可有效将粉尘控制在转载点两侧20 m空间范围内,除尘效率达94.1％.

In the coal mining air stopping of goaf of the material,It mainly chooses the brick and the concrete gunniting.These rigid materials making the air stopping must conside the roof of the compression and the impact of the explosion.As a new material mainly using yield principle,has its traditional materials not having the features.The paper tried to make a new technology,to improve the stability of permanent air stopping,with coal mine production safety requirements.

The main factors of multi-component mine gas explosion in the mine fire area are analyzed.These factors influence on multi-component mine gas explosion are also analyzed.Several methods of controlling combustible gas explosion are pointed out.These methods can be used in the mine fire area,especially the confined and unseal process of the big mine fire area.As the comprehensive judgement of the flammable mixture gas explosion hazard and establishment of explosion-proof measures,these methods have practical value and significance.