Study on the Evolutionary Behavior of Methane Lean/Enriched Combustion Explosion Flame in Sliding Porous Material

ABSTRACT

A large number of gas explosion accidents have shown that secondary explosions are more dangerous and destructive than the primary. Based on the self-designed sliding experiment platform, the influence of sliding device on the evolution behavior of fuel enriched and lean flame fronts be compared. The study shown that adjusting the initial sliding position of porous media to 40 cm and using an appropriate spring coefficient can effectively extinguish methane flame in both fuel enriched and fuel lean combustion states. This method can reduce the range of flame diffusion, burning time and intensity compared with using fixed porous media, and also the maximum explosion overpressure. When using a sliding device in methane lean combustion, it can achieve significant reductions in the duration of the reverse diffusion flame (up to 64.02%), the quenching time of the flame (up to 44.21%), and the explosion overpressure inside the tube (up to 24.2%). During rich methane combustion, using sliding device can result in a reduction of up to 62.26% in the duration of the reverse diffusion flame, up to 46.81% in the quenching time of the flame, and up to 44.12% in the explosion overpressure inside the tube. Additionally, the inhibitory effect of the sliding device and the increase in elastic coefficient follow a pattern of initially increasing and then decreasing. In general, the sliding device is more effective in suppressing methane flames and overpressure during both enriched and lean fuel combustion than fixed device. The results can provide valuable insights for the development of secondary explosion prevention technology, which is crucial for preventing and managing methane explosion accidents.

KEYWORDS:

• Sliding devices
• Fuel lean combustion
• Fuel enriched combustion
• Maximum explosion overpressure
• Reverse diffusion

Author Contribution

Shilin Leiab: Investigation, Methodology, Data curation, Writing-original draft.

Yulong Duanab*: Conceptualization, Resources, Funding acquisition, Supervision, Writing – review & editing.

Ziyang Wenab: Carried out experiments, Investigation.

Jun Longab: Investigation, Writing – review & editing.

Hailin Jiac: Investigation, Writing – review & editing.

Acknowledgements

This work was supported by the Open Foundation of the Chongqing Key Laboratory for Oil and Gas Production Safety and Risk Control (cqsrc202111); The Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN202101503); The State Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University) (WS2021A04); The Science and Technology Innovation Project for Graduate Students of Chongqing Institute of Science and Technology (YKJCX2120701).

Disclosure statement

We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work, there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled.

Finding

This work was supported by the Open Foundation of the Chongqing Key Laboratory for Oil and Gas Production Safety and Risk Control (cqsrc202111); The Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN202101503); The State Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University) (WS2021A04); The Science and Technology Innovation Project for Graduate Students of Chongqing Institute of Science and Technology (YKJCX2120701).

Highlights

1. Evaluated the inhibition of reverse diffusion flame in lean combustion and enriched combustion states under the effect of sliding device.

2. The motion process of sliding porous media was discussed, and based on the changes in gas concentration in actual explosion environments, two scenarios were considered: lean combustion and enriched combustion.

3. Compared to fixed porous materials, sliding device can effectively suppress reverse diffusion combustion caused by quenching failure, revealing the mechanism of sliding porous media suppressing methane flame quenching and explosion overpressure.

4. The explosion-proof mode relying on sliding device can provide effective reference for suppressing secondary combustion and explosion.

Additional information

Funding

The work was supported by the The Open Foundation of the Chongqing Key Laboratory for Oil and Gas Production Safety and Risk Control [cqsrc202111]; The Science and Technology Innovation Project for Graduate Students of Chongqing Institute of Science and Technology [YKJCX2120701]; The State Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University) [WS2021A04]; The Science and Technology Research Program of Chongqing Municipal Education Commission [Grant No. KJQN202101503].