Simulated analysis device and method for pressure regulation and ventilation of multi-level goaf of coal seam group

Abstract

The invention, which belongs to the field of coal mine disaster prevention and control, provides a simulated analysis device and method for pressure regulation and ventilation of a multi-level goaf ofa coal seam group. The device comprises a simulated working face, a simulated roof rock layer, a simulated local-layer goaf, and a simulated upper goaf. The simulated working face includes an inlet way pipeline, a coal mining face pipeline, a return air pipeline, a small fan, a simulated wind window, a color smoke release box, a wind pressure sensor, an oxygen and the sulfur hexafluoride concentration sensor. The simulated local-layer goaf and the upper goaf are glass steel box bodies with transparent glass balls filling the insides and are provided with multiple oxygen and sulfur hexafluoride concentration sensors and wind pressure sensors. Gas in the simulated working face, the local-layer goaf, and the upper goaf are set to have different colors. The air flowing rules and voltage regulation effects of the flowing fields of the working face and the multi-layer goaf are analyzed comprehensively, qualitatively and quantitatively by observing air flowing directions in various ventilation modes and real-time monitoring values of all sensors, thereby providing parameter guidance for engineering practice.

Description

technical field [0001] The invention belongs to the field of disaster prevention and control in coal mines, and in particular relates to a pressure regulation and ventilation simulation analysis device and method for multi-layer gobs of coal seam groups. Background technique [0002] Most of the mining areas in my country are coal seam groups, and after mining, multi-layer goafs are connected to each other. During the mining process of the lower coal seam working face, the traditional negative pressure ventilation method is used, which can easily cause the leakage of toxic and harmful gases such as gas and carbon monoxide in the upper multi-layer goaf, threatening the safe production of the working face. With the positive pressure ventilation method, the wind pressure at the working face is higher than that of the upper multi-storey goaf, and a large amount of fresh air flows into the goaf, which may easily cause spontaneous combustion of residual coal in the goaf or even a ...

AI Technical Summary

Problems solved by technology

At present, methods of pressure regulation and ventilation in multi-layer mined-out areas of coal seam groups mostly use methods such as theoretical analysis, numerical simulation, or on-site debugging. There are problems such as too large errors in the selection of pressure regulation parameters or high debugging costs, and there is a lack of application of experimental methods to comprehensively Analysis and determination of reasonable parameters and effect of pressure regulation in working face and multi-layer goaf

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