Leakage Characteristics of Flammable Gas in Confined Space and the Optimum Design of Explosion Venting: Numerical Simulation on Basis of the  Major Accident

JIN Youping; SHUAI Jian; WANG Wenxiang; XU Houjia

doi:10.11858/gywlxb.20230658

Volume 37 Issue 6

Dec 2023

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Chinese Journal of High Pressure Physics > 2023 > 37(6): 065201.

JIN Youping, SHUAI Jian, WANG Wenxiang, XU Houjia. Leakage Characteristics of Flammable Gas in Confined Space and the Optimum Design of Explosion Venting: Numerical Simulation on Basis of the Major Accident[J]. Chinese Journal of High Pressure Physics, 2023, 37(6): 065201. doi: 10.11858/gywlxb.20230658

Citation:

JIN Youping, SHUAI Jian, WANG Wenxiang, XU Houjia. Leakage Characteristics of Flammable Gas in Confined Space and the Optimum Design of Explosion Venting: Numerical Simulation on Basis of the Major Accident[J]. Chinese Journal of High Pressure Physics, 2023, 37(6): 065201. doi: 10.11858/gywlxb.20230658

Citation:

JIN Youping, SHUAI Jian, WANG Wenxiang, XU Houjia. Leakage Characteristics of Flammable Gas in Confined Space and the Optimum Design of Explosion Venting: Numerical Simulation on Basis of the Major Accident[J]. Chinese Journal of High Pressure Physics, 2023, 37(6): 065201. doi: 10.11858/gywlxb.20230658

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Leakage Characteristics of Flammable Gas in Confined Space and the Optimum Design of Explosion Venting: Numerical Simulation on Basis of the Major Accident

doi: 10.11858/gywlxb.20230658

JIN Youping^{1, 2
,},
SHUAI Jian^{1, 3,*
,
,},
WANG Wenxiang²,
XU Houjia^{1, 3}

1.
College of Safety and Ocean Engineering, China University of Petroleum (Beijing), Beijing 102249, China
2.
Shenzhen Gas Co. Ltd., Shenzhen 518049, Guangdong, China
3.
Key Laboratory of Oil and Gas Safety and Emergency Technology, Ministry of Emergency Management, Beijing 102249, China

Received Date: 08 May 2023
Rev Recd Date: 12 Jun 2023

Available Online: 08 Dec 2023

Issue Publish Date: 15 Dec 2023

Abstract

Abstract

In order to study the gas leakage in a confined space and the effect of venting methods on the subsequent explosion, a major gas accident scene in confined space was constructed based on FLACS software. The leakage, diffusion, and explosion behavior of the leaked gas in the confined space was investigated, and the venting effect on the subsequent explosion was analysed. The results showed that the leaked gas cloud from the closed section of the pipeline diffuses outward along the outer wall of the pipeline, forming an irregular concave shape, and the diffusion speed will be accelerated when encountering obstacles. The maximum overpressure of leaked gas cloud is 660.7 kPa, which can seriously damage the surrounding buildings, and the degree of damage to the buildings at the open end of the restricted space is higher than that at the closed end. When the outlet is installed in the axial position of the flame development, the pressure-venting effect is the best. The maximum explosion pressure in the confined space can be reduced to 312.4 kPa, a reduction of 52.70%. If the outlet is placed on the side of the confined space, the closer it is to the ignition source, the better the venting effect will be. The maximum explosion pressure in the confined space can be significantly reduced by increasing the length-to-width ratio of the outlet to expand the explosion area. When the length-to-width ratio is 34∶1, the maximum explosion pressure is reduced to 15.4 kPa, a reduction of 97.65%. Reducing the outlet opening pressure can effectively reduce the maximum explosion pressure in the confined space. For the outlet opening pressure at 50 kPa, the maximum explosion pressure is reduced to 351.0 kPa, a reduction of 46.87%.
- confined space,
- gas,
- scenario simulation,
- explosion relief optimization,
- FLACS,
- leakage and diffusion,
- blast shock wave

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References(21)

References

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Leakage Characteristics of Flammable Gas in Confined Space and the Optimum Design of Explosion Venting: Numerical Simulation on Basis of the Major Accident

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