Experimental simulation for "sorting" effect after gas and coal outburst in blind draft

In order to study "sorting" effect after gas and coal outburst in blind draft the experimental simulation system has been set up. Moreover the sedimentation law for a single coal particle has been analysed based on the theory of pneumodynamics under the action of gas. According to the experimental results the reason why gas-small coal fluid is sorted has been elaborated and the "sorting" flow law for gas-small coal fluid has been analysis. The experimental results show that a larger coal particle falls to the ground faster than a smaller one. In other words the smaller coal particle can be "carried" to a far location by the impact gas flow. It can also be blown up by the impact gas flow once again.