Characteristics of gas explosion to diffusion combustion under porous materials

DUAN Yulong; WANG Shuo; HE Sen; WAN Lin

doi:10.11883/bzycj-2020-0009

Volume 40 Issue 9

Sep. 2020

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Article Navigation > Explosion And Shock Waves > 2020 > 40(9): 095401

DUAN Yulong, WANG Shuo, HE Sen, WAN Lin. Characteristics of gas explosion to diffusion combustion under porous materials[J]. Explosion And Shock Waves, 2020, 40(9): 095401. doi: 10.11883/bzycj-2020-0009

Citation:

DUAN Yulong, WANG Shuo, HE Sen, WAN Lin. Characteristics of gas explosion to diffusion combustion under porous materials[J]. Explosion And Shock Waves, 2020, 40(9): 095401. doi: 10.11883/bzycj-2020-0009

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Characteristics of gas explosion to diffusion combustion under porous materials

doi: 10.11883/bzycj-2020-0009

DUAN Yulong^{1, 2
,},
WANG Shuo^{1, 2},
HE Sen^{1, 2},
WAN Lin^{1, 2}

1.
College of Safety Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
2.
Center for Multiscale Process Safety Research in Oil and Gas, Chongqing University of Science and Technology, Chongqing 401331, China

Received Date: 2020-01-03
Rev Recd Date: 2020-06-17
Publish Date: 2020-09-01

Abstract

Abstract

To analyze the effect of porous materials on the explosion characteristics of premixed gas, a self-built explosion experiment platform was used to investigate the behavior of porous materials with different porosities and thicknesses on premixed methane/air gas explosion with a stoichiometric ratio of 1. Experimental studies have shown that porous materials with different porosities can either promote or suppress the explosive flame and overpressure. When the porosity was low, the propagation speed of the deflagration flame decreased with the increase of material thickness, and when the thickness was large, the flame had a short propagation delay. When the porosity was high, the quenching effect occurred when the premixed flame impacted the porous material. However, in the following period, due to negative pressure suction, diffusion combustion occurred on the surface of the material towards the side of the exploded area, and the degree of diffusion combustion was inversely proportional to the thickness of the material. The solid phase structure of porous materials could reduce the efficiency of pressure release and absorb energy, resulting in increasing the rate of explosion overpressure rise and reducing the overpressure peak. When the porous material with δ=10 were used to promote flame propagation, compared with premixed gas explosions with a stoichiometric ratio of 1, the peak overpressure could be increased by about 2 times at most, causing more serious consequences. Quenching occurred when flame impacted the porous material with δ=20, and the maximum overpressure attenuation was 47.17%. The maximum overpressure decreased by 24.62% at the porous material with δ=30.
- gas explosion,
- porous materials,
- quenching,
- diffusion combustion,
- explosion suppression

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References

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