Optimization Analysis of Coal Particles Passing Performance of Gas Extraction Screen Pipe Based on Discrete Element Method

In order to analyze the passing performance of the conventional round-hole screen pipes and the slotted screen pipes, this paper built the particle flow model of the conventional round-hole screen pipes and the slotted screen pipes with PFC^3D software on the basis of discrete element method, matched the particle flow simulation parameters by natural rest angle simulation test combined with the laboratory test results of coal particles, and analyzed the influence of parameters, including the screen mesh diameter, the width of the slotting and the length of the slotting on the ability of coal particles passing through screen pipe by simulating the coal particles volume passing through screen pipe. The results show that the volume of the coal particles passing through the screen tube increases with the increase of the diameter of the screen, the width of the slotting and the length of the slotting, and the volume of the particles under the equivalent overflow area is linearly dependent on the diameter of the screen, the width of the slotting and the length of the slotting. However, in the same overflow area, the passed particle volume of the slotted screen pipe is far smaller than the round-hole screen pipe, and the volume of the conventional round-hole screen pipe of φ10 mm can reach 33 times that of the 2 mm × 30 mm slotted screen pipe.