Local resistance suppression characteristics and low resistance device development of coal particle gas emission experiment

The traditional gas emission experiment is widely used in the study of gas outburst mechanisms, but its test device will produce local resistance in valves, pipelines, and other components, which hinders the natural release of gas. In this paper, the inhibition characteristics of local resistance in a coal particle gas emission experiment are studied. The traditional gas emission experimental device and the developed non-local resistance emission device are compared. Flow simulation software is used to simulate the fluid of the release device, and the influence of resistance on the gas emission speed is verified by experiments. In the traditional high-pressure adsorption gas release device, when the gas flows through the pipeline and accessories, the resistance along the way and the local resistance are superimposed, which inhibits the natural release process and causes the initial data distortion. The non-local resistance release device is designed with a special expansion pipe and a double-blade rotating structure so that the release device can be quickly opened within 0.1 s, which significantly reduces the on-way resistance and local resistance. The experimental results show that the diffusion amount of the unimpeded device in the early stage of gas diffusion (first 60 s) is 9.08%–25.07% higher than that of the traditional device, and its resistance value is only about 1% of that of the traditional device, which effectively eliminates the influence of resistance on the diffusion process, makes the experiment closer to the real gas outburst process, and can promote the study of gas outburst mechanisms.