Experimental and molecular dynamics studies on the synergistic suppression of gas explosions in gas-solid media

QIAO Yonggang; HUA Jie; YUAN Danping; ZHANG Zeyu; ZUO Wenzhe

doi:10.11883/bzycj-2023-0322

Volume 44 Issue 5

May 2024

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QIAO Yonggang, HUA Jie, YUAN Danping, ZHANG Zeyu, ZUO Wenzhe. Experimental and molecular dynamics studies on the synergistic suppression of gas explosions in gas-solid media[J]. Explosion And Shock Waves, 2024, 44(5): 055402. doi: 10.11883/bzycj-2023-0322

Citation:

QIAO Yonggang, HUA Jie, YUAN Danping, ZHANG Zeyu, ZUO Wenzhe. Experimental and molecular dynamics studies on the synergistic suppression of gas explosions in gas-solid media[J]. Explosion And Shock Waves, 2024, 44(5): 055402. doi: 10.11883/bzycj-2023-0322

Citation:

QIAO Yonggang, HUA Jie, YUAN Danping, ZHANG Zeyu, ZUO Wenzhe. Experimental and molecular dynamics studies on the synergistic suppression of gas explosions in gas-solid media[J]. Explosion And Shock Waves, 2024, 44(5): 055402. doi: 10.11883/bzycj-2023-0322

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Experimental and molecular dynamics studies on the synergistic suppression of gas explosions in gas-solid media

doi: 10.11883/bzycj-2023-0322

QIAO Yonggang^{1, 2
,},
HUA Jie^{1
,
,},
YUAN Danping¹,
ZHANG Zeyu³,
ZUO Wenzhe¹

1.
College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2.
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
3.
Shanxi Institute of Geology and Mineral Resources Company Limited, Taiyuan 030001, Shanxi, China

Received Date: 2023-09-06
Rev Recd Date: 2023-12-10

Available Online: 2024-01-25

Publish Date: 2024-05-08

Abstract

Abstract

Aiming at the problem that the traditional single-phase explosion suppression medium is not effective, it is proposed that the gas-solid two-phase medium cooperates with different explosion suppression principles to achieve efficient and rapid suppression of gas explosion. The method of using NaHCO₃ powder and CO₂ gas to synergistically suppress gas explosion was studied. The standard 20 L spherical explosion test device was selected, and the configuration optimization of reactants, transition states and products in the microscopic reaction mechanism of methane explosion was carried out by DFT (density funchtion theory). On this basis, the subsequent calculation was carried out. The results show that the single-phase medium with a volume fraction of 16% CO₂ and 0.35 g/L NaHCO₃ has an excellent effect on suppressing gas explosion, but the presence of 0.1 g/L powder will increase the maximum boosting rate by 17.9%. Compared with single-phase CO₂ and single-phase NaHCO₃ powder, the gas-solid two-phase medium explosion suppression phase reduces the maximum explosion pressure. When 8% volume fraction CO₂ is used in conjunction with 0.125 g/L powder, the maximum explosion pressure of gas explosion is reduced by 72.42%, and the maximum pressure rise rate is reduced to 2.345 MPa/s. The suppression effect is optimal; however, when 4% volume fraction CO₂ cooperates with 0.05 g/L powder, the maximum explosion pressure rise rate increases by 93.68%, and the reaction shows a certain intensification phenomenon. The quantum chemical calculation shows that in the process of gas-solid two-phase medium synergistic inhibition of gas explosion, the decomposition of NaHCO₃ powder will absorb the heat in the reaction system, and its decomposition products will preferentially react with OH· and H· in the mixed system, hindering the generation of O·, inhibiting the chain process in the CH₂O stage, and then inhibiting the transfer process of chain reaction. The CO₂ produced by the decomposition of NaHCO₃ powder and the CO₂ in the mixed system dilute the volume fraction of methane in the mixed system, reduce the probability of collision between methane and oxygen molecules, and effectively inhibit the reaction process.
- gas explosion suppression,
- synergistic gas-solid two-phase media,
- reaction mechanism,
- mixed systems,
- heat absorption,
- molecular dynamics

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