Fire extinguishing and explosion suppression characteristics of explosion suppression system with N2/APP after methane/coal dust explosion

Zhao, Qi; Li, Yang; Chen, Xianfeng

doi:10.1016/j.energy.2022.124767

Cited by 31 publications

(3 citation statements)

References 50 publications

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“…Liu et al 14 proposed the inhibition mechanism of NaHCO 3 on oil shale using thermogravimetric differential scanning calorimetry combined with scanning electron microscope (SEM) images of explosive residues. Zhao et al 15 designed a N 2 /APP two-phase explosion suppression system, which suppresses the explosion after the explosion, rather than pre-mixing and inerting the explosive medium. Compared to electrostatic spraying powder, it has received less attention.…”

Section: Introductionmentioning

confidence: 99%

Study on Explosion Characteristics and Mechanism of Electrostatic Spray Powder

Qin,

Zhang,

Shi

et al. 2024

ACS Omega

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In order to fully understand the explosion risk of electrostatic spraying powder, corresponding preventive measures are put forward. The explosion characteristics, ignition sensitivity, and flame propagation of three typical electrostatic spraying powders were tested using a 20 L spherical explosion test device, a G–G furnace test device, and a Hartmann tube test device, and the explosion process and mechanism of electrostatic spraying powders were discussed. The results show that the maximum explosion pressure and the maximum explosion pressure rise rate increase first and then decrease with the increase in mass concentration. The maximum explosion pressure and the maximum explosion pressure rise rate of acrylic powder coating are the largest, which are 0.75 and 85.4 MPa/s, respectively. The shortest burning time is 97.5 ms, and the highest explosion danger level is 23.46 MPa·m/s. The flame propagation of electrostatic spraying powder develops slowly; the flame front spreads linearly and the average flame velocity increases first and then decreases. The explosive development process of powder coating particles is concentrated in the three-phase system of solid particles, molten particles, and pyrolytic gasification combustible gas, which goes through the kinetic process of particle heating melting, cross-linking curing, pyrolytic gasification, combustion, and extinction.

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Section: Introductionmentioning

confidence: 99%

Study on Explosion Characteristics and Mechanism of Electrostatic Spray Powder

Qin,

Zhang,

Shi

et al. 2024

ACS Omega

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“…The findings of a 20 L spherical experimental setup utilized by Luo et al [ 21 ] to investigate the inhibitory impact of CO 2 and ABC powder on mine gas explosions revealed a synergistic effect between CO 2 and ABC powder. The findings of a study by Zhao et al [ 22 ] on the use of N 2 /APP to suppress fires and explosions caused by methane and coal dust in vertical pipes revealed that the system could successfully stop the spread of explosive flames caused by methane and coal dust. Li et al [ 23 ] obtained the characteristics of explosion flames and explosion pressure through experiments by changing the equivalence ratio and water mist density.…”

Section: Introductionmentioning

confidence: 99%

Research on the Rule of Explosion Shock Wave Propagation in Multi-Stage Cavity Energy-Absorbing Structures

Chen¹,

Liu

2023

Materials

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The propagation laws of explosion shock waves and flames in various chambers were explored through a self-built large-scale gas explosion experimental system. The propagation process of shock waves inside the cavity was explored through numerical simulation using Ansys Fluent, and an extended study was conducted on the wave attenuation effect of multiple cavities connected in a series. The findings show that the cavity’s length and diameter influenced the weakening impact of shock waves and explosive flames. By creating a reverse shock wave through complicated superposition, the cavity’s shock wave weakening mechanism worked. By suppressing detonation creation inside the cavity, the explosive flame was weakened by the cavity’s design. The multi-stage cavity exhibited sound-weakening effects on both shock waves and explosive flames, and an expression was established for the relationship between the suppression rate of shock force and the number of cavities. Diffusion cavities 35, 55, 58, and 85 successfully suppressed explosive flames. The multi-stage cavity efficiently reduced the explosion shock wave. The flame suppression rate of the 58-35 diffusion cavity explosion was 93.38%, whereas it was 97.31% for the 58-35-55 cavity explosion. In engineering practice, employing the 58-58 cavity is advised due to the construction area, construction cost, and wave attenuation impact.

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“…In view of this, scholars are constantly looking for different types of explosion suppressants in order to obtain affordable and effective explosion suppressants. , The inhibitory effects of different explosion suppressants on organic dust explosions have also been widely studied. It is found that the heat absorbed by NH 4 H 2 PO 4 after decomposition is about 6.5 times that of NaHCO 3 after decomposition, and overall, both NH 4 H 2 PO 4 and NaHCO 3 have a significant inhibitory effect on organic dust explosions. − At the same time, because the explosion characteristics are very prone to change, it is necessary to continuously carry out targeted research, so as to provide valuable experience for comprehensive control of related accidents.…”

Section: Introductionmentioning

confidence: 99%

Research on Explosion Pressure Characteristics of Long Flame Coal Dust and the Inhibition Effect of Different Explosion Suppressants

Liu,

Gao,

et al. 2023

ACS Omega

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To discuss the inhibition of long flame coal dust explosion pressure, NaHCO3, KHCO3, and NH4H2PO4 are selected as explosion suppression dust for explosion pressure tests under different conditions. The results show that when 25–38 and 38–45 μm coal dust are mixed in 1:1 ratio, the maximum explosion pressure is the largest, the maximum pressure is 0.79 MPa, and the maximum pressure rise rate is 74.89 MPa·s–1. The suppression dusts have good inhibition effect on explosion, the order of inhibition is NaHCO3, KHCO3, and NH4H2PO4 from the smallest to the largest. With the reduction of particle size of NH4H2PO4, its inhibition effect on explosion pressure is increasing, because more NH4H2PO4 particles move around coal dust particles, blocking the heat transfer and kinetic energy exchange. The above three suppression dust and their suppression methods can provide important data for dust prevention and control and have certain reference significance for carrying out explosion suppression work.

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Fire extinguishing and explosion suppression characteristics of explosion suppression system with N2/APP after methane/coal dust explosion

Cited by 31 publications

References 50 publications

Study on Explosion Characteristics and Mechanism of Electrostatic Spray Powder

Study on Explosion Characteristics and Mechanism of Electrostatic Spray Powder

Research on the Rule of Explosion Shock Wave Propagation in Multi-Stage Cavity Energy-Absorbing Structures

Research on Explosion Pressure Characteristics of Long Flame Coal Dust and the Inhibition Effect of Different Explosion Suppressants

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