Simulation Study of Gas Explosion Propagation Law in Coal Mining Face With Different Ventilation Modes

Jiajia Liu,Zishuo Nie,Di Yang,Shouqi Chen,Yang Zhang

doi:10.3389/fenrg.2022.846500

Abstract

In ventilation working face, different ventilation way is one of the important factors affecting the propagation of gas explosion shock wave. In order to study the gas explosion shock wave propagation laws in coal mining faces with different ventilation methods, using Fluent simulation software, combined with pipeline gas explosion experiments and the actual situation of gas accumulation area explosion in the corner of 415 coal face in Chenjiashan coal mine, Shaanxi Province, and on the basis of building a three-dimensional mathematical and physical model, the gas explosion simulations under Y-type and W-type ventilation methods were carried out, respectively. The results are described as follows: (1) The attenuation trend of overpressure peak value of inlet roadway 1 and working face with Y-type ventilation conforms to the power function form. Intake airway 2 and return airway have the same peak overpressure attenuation trend, but the peak value of overpressure in return airway is generally 10.6% higher than that in intake airway 2, and its attenuation rate is a process from low to high and then to low. (2) The peak attenuation trend of overpressure in intake airways 1 and 2 with W-type ventilation conforms to the form of power function, and the peak attenuation trend of overpressure in return airway conforms to the form of exponential function. The peak value of overpressure decreases with the increase in the distance from the explosion source, and its attenuation rate decreases gradually. The research results have important theoretical significance for improving the prevention of gas explosion in coal mining face with different ventilation modes.

Highlights

Coal mine is an extremely important link in China’s energy structure and has always occupied a very important position (Ding et al, 2020)
The peak value of shock wave overpressure is relatively high as it is close to the explosion source, and its attenuation trend is a process from gentle to severe and to gentle
1) Under the condition of Y-type ventilation mode: in the working face and intake airway 1, the shock wave overpressure is a process of attenuation from violent to steady attenuation, and their attenuation laws are the same and present a power function relationship

Summary

INTRODUCTION

Coal mine is an extremely important link in China’s energy structure and has always occupied a very important position (Ding et al, 2020). Because of the symmetry of W-type ventilation mode, when gas explosion occurs in the accumulation area in the middle of the working face, combined with the relevant assumptions of numerical simulation, the overpressure variation law of intake airways 1 and 2 is the same in theory. 15m, and it decays steadily at a rate of approximately 0.05 from 40 m

CONCLUSION

Findings

DATA AVAILABILITY STATEMENT