On the mechanism of magnetic field effect on methane explosion

GAO Jiancun; YANG Xigang; WANG Le; HONG Zijin; HU Shoutao; LI Ruxia; SUN Xu

doi:10.11883/bzycj-2022-0259

Volume 43 Issue 1

Jan. 2023

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GAO Jiancun, YANG Xigang, WANG Le, HONG Zijin, HU Shoutao, LI Ruxia, SUN Xu. On the mechanism of magnetic field effect on methane explosion[J]. Explosion And Shock Waves, 2023, 43(1): 012101. doi: 10.11883/bzycj-2022-0259

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On the mechanism of magnetic field effect on methane explosion

doi: 10.11883/bzycj-2022-0259

GAO Jiancun^{1, 2
,},
YANG Xigang¹,
WANG Le³,
HONG Zijin¹,
HU Shoutao^{1, 2
,
,},
LI Ruxia¹,
SUN Xu⁴

1.
School of Safety Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
2.
Beijing Institute of Safety Production Engineering Technology, Beijing 102617, China
3.
School of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210094, Jiangsu, China
4.
Beijing Hengan Tiancheng Technology Co., Ltd., Beijing 101200, China

Received Date: 2022-07-18
Rev Recd Date: 2022-10-21

Available Online: 2022-11-02

Publish Date: 2023-01-05

Abstract

Abstract

To study the effect mechanism of magnetic fields on methane explosion, an experiment was carried out by detonating the premixed gas of methane with the volume fraction of 9.5% and air as the rest constituent in a magnetic fields. Effect patterns of magnetic fields on methane explosion characteristics emerged based on the explosion pressure measured by pressure sensors and flame propagation velocity measured by detonation velocity meter. The gas after explosion was quantitatively sampled by gas sampler, and the volume fraction of reactants and products was detected by flue gas analyzer and gas chromatograph. Thus, the effect patterns of magnetic fields on the volume fraction of methane explosion products and reactants was obtained. The experimental results show that in the magnetic fields, the maximum explosion pressure of methane is decreased by 27.33%, and the explosion pressure rise rate is decreased by 40.96%. Along the flame propagation direction, the magnetic fields first promote and then suppress the flame propagation velocity of methane explosion, and the suppression effect is stronger than the promotion effect. Under the magnetic fields, the average flame propagation velocity of methane explosion is decreased by 16.39%. The volume fraction of reactants and products show obvious differences. The residue of methane and oxygen increased by 28.81% and 66.98%, respectively. The production of CO and CO₂ decreased by 20.00% and 12.90%, respectively. Combined with sensitivity analysis, the methane explosion chain reaction process is simulated by the Chemkin-Pro software to derive the key radical and radical reactions in the methane explosion process. The •H, •O, •OH, •CH₃, •CH₂O are the key free radicals of methane explosion. Through theoretical calculation, the forces of different free radicals under the action of magnetic fields are analyzed. Combined with the reaction paths analysis, the effect mechanism of magnetic fields on methane explosion was explored. Due to the high magnetic susceptibility of •O, it is attracted to areas with dense magnetic induction line. The collision probability of •O with other free radicals is reduced, thereby reducing the rate of the •HCO→CO→CO₂ chain reaction, resulting in a decrease in the production of CO and CO₂, which ultimately leads to a decrease in methane explosion intensity.
- magnetic field,
- free radicals,
- magnetic susceptibility,
- reaction paths,
- chain reaction

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References

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