Study of the effect of pipe wall conduit on the characteristics of methane explosion in the bend pipe

ABSTRACT

To improve the efficiency and protection level of combustible gas explosion relief in urban underground pipeline corridors, we built a 150 × 150 × 2000 mm³ transparent pipeline experimental platform to simulate underground pipeline corridors and studied the effect of different positions and diameters of explosion relief conduits on the side of the pipeline on the characteristics of the explosion of methane in the pipeline. The results show that the flame is twisted and deformed at the bend, increasing the contact area between the fuel and oxygen, thus causing flame acceleration. Wall conduit relief bend in the flame has a certain hysteresis, in the front end of the bend, and the back end of the pipe wall conduit were installed, the flame propagation time of 254 ms, and 200 ms, respectively, increased by 71 ms, and 17 ms, the delay ratio of 38.80%, 9.29%, respectively. When the front part of the pipe wall conduit pipe diameter of 60 mm, 80 mm, and 100 mm, the flame propagation time was delayed 71 ms, 82 ms, and 105 ms, the delay ratio of 38.80%, 44.81%, 57.38%, and the position of the front of the pipe wall conduit pipe diameter is larger, the lower the peak explosion pressure.

KEYWORDS:

• Wall conduit
• explosion relief
• bend pipe
• blast overpressure
• methane

Disclosure statement

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

Additional information

Funding

This work was supported by the 2021 Jiangsu Province Key Research and Development Plan (Social Development) Project [BE2021641].

Notes on contributors

Yong Huang

Yong Huang Ph.D., Senior Engineer, Master Supervisor. His main research interests are combustion and explosion application and prevention, chemical safety, and fire engineering.

Tongtong Xue

Tongtong Xue is currently pursuing his master’s degree in the School of Safety Science and Engineering at Changzhou University.

Wenhui Deng

Wenhui Deng is currently pursuing his master’s degree in the School of Safety Science and Engineering at Changzhou University.

Yan Tang

Yan Tang Ph.D., Assistant to the Dean, Master’s Supervisor. His main research interests are the Safety of New Energy and New Materials, Chemical Safety, Theory and Technology of Fire Prevention and Control.