The variation of environmental parameters after gas explosion in semi-closed pipeline

ABSTRACT

The understanding of the laws of environmental parameters in the later stage of gas explosion in coal mine roadways is of great significance for the prevention and control of derivative disasters and post-disaster rescue. To further comprehend this, the article performed explosion experiments under different gas concentrations in a semi-closed pipeline, focusing on the continuously varied rules of environmental parameters (pressure, temperature, humidity) after a gas explosion. The results showed that the pressure at the open end of the pipeline exhibited a relatively remarkable upward tendency when it arrived in the valley. By comparing with the pressure monitored in the middle of the pipeline, it was concluded that there was a more apparent air reflux phenomenon at the open end. The changes in temperature and humidity were roughly similar, both had a relatively distinct increase after an explosion, with the temperature rising by 7.2% on average and the humidity increasing by 2.7% on average. When the methane concentration was 9.5%, its pressure peaks, temperature peak, and humidity peak were all the maximum. Moreover, the phenomenon of air reflux was also the earliest, with 3.1 seconds, which demonstrated that the closer to the gas equivalent concentration, the more sufficient and violent the explosion reaction, the greater the possibility of secondary accidents. The research can provide a theoretical basis for preventing derived hazards (coal dust explosions, secondary explosions) and reducing the effect of derived hazards.

KEYWORDS:

• Environmental parameters
• later stage of gas explosion
• air reflux phenomenon
• semi-closed pipeline
• gas concentration

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This word was supported by the Guizhou Scientific Support Project (Research and Demonstration of Cloud Early Warning Technology for Gas Disaster Based on Multidimensional Data Driven) [2021 General 514].

Notes on contributors

Chengwu Li

Chengwu Li is a professor of the School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing. His research interests are mine gas prevention, mine disaster monitoring and early warning, safety evaluation and management, and so on.

Zhen Qiao

Zhen Qiao is a PhD student at the School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing. His research interests focus on mine gas prevention, mine gas explosion, and mine disaster monitoring and early warning.

Min Hao

Min Hao is a PhD student at the School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing. His research interests are coal molecular simulation and mine gas prevention

Chengmin Wei

Chengmin Wei is a PhD student at the School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing. His research interest is mine gas prevention.

Gen Li

Gen Li is an MS student at the School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing. His research interest focuses on coal gas explosions.