Spurting NH4H2PO4 Powder to Prevent the Propagation of Gas Explosion along the Duct

Lu, Chunmei; Zhang, Yunpeng; Zhu, Han; Meng, Qi; Pan, Rongkun; Yu, Minggao

doi:10.1080/00102202.2020.1748607

Cited by 10 publications

(3 citation statements)

References 31 publications

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“…The findings demonstrated that nitrogen gas spraying might stop explosions from spreading throughout the pipeline when the nitrogen pressure rose beyond 0.3 MPa. An active gas explosion flame detection system was created by Lu et al [ 26 ] and was used to automatically identify flames and spray extinguishing chemicals following a gas explosion. The findings showed that using ABC dry powder successfully put out explosion flames and that raising nitrogen pressure lowered the concentration of flammable gases in the pipeline.…”

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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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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“…Jiang et al [18] developed an automatic spraying system employing nitrogen and ABC powder to suppress gas explosions. Lu et al [19] engineered integrated equipment that automatically detects flames and dispenses suppressants, evaluating the suppressive effects of active flame-proof devices positioned at various ventilation points during gas explosions. Cui et al [20] created equipment involving a vacuum chamber coupled with CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Isolation Effect of an Active Flame-Proof Device on a Gas Explosion in an Underground Coal Mine

Huang,

Si,

Wen

et al. 2023

Fire

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Passive explosion-isolation facilities in underground coal mines, such as explosion-proof water troughs and bags, face challenges aligned with current trends in intelligent and unmanned technologies, due to restricted applicability and structural features. Grounded in the propagation laws and disaster mechanisms of gas explosions, the device in this paper enables accurate identification of explosion flames and pressure information. Utilizing a high-speed processor for rapid logical processing enables judgments within 1 ms. Graded activation of the operating mechanism is enabled by the device. The tunnel flame-proof device’s flame-extinguishing agent has a continuous action time of 6075 ms. Experiments on the active flame-proof effect of a 100 m3 gas explosion were conducted using a cross-sectional 7.2 m2 large-tunnel test system. With a dosage of 5.6 kg/m2, the powder flame-extinguishing agent completely extinguished the explosion flame within a 20 m range behind the explosion isolator. Numerical calculations unveiled the gas-phase chemical suppression mechanism of the powder flame-extinguishing agent NH4H2PO4 in suppressing methane explosions. Building upon these findings, application technology for active flame-proofing was developed, offering technical support for intelligent prevention and control of gas explosions in underground coal mines.

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“…As chemical inhibitors, alkali metal compounds are effective inhibitors of combustible gas explosions [22] . Lu et al [23] conducted methane-air explosion suppression experiments in a long straight pipe (150 mm × 150 mm × 2000 mm). They found that NaHCO3 particles formed a suppression zone downstream of the pipe under the influence of nitrogen, effectively inhibiting explosion propagation.…”

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confidence: 99%

Suppression of methane–air explosions using air-jet-driven NaHCO3 powder and porous barrier

Qiao,

Miao,

et al. 2024

Preprint

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The inhibition of methane–air explosions by air-jet-driven NaHCO3 powders and porous barriers was investigated in this study. Flame images and overpressure data were recorded using high-speed cameras and pressure sensors. The inhibition mechanism of NaHCO3 powder was further investigated using the reaction mechanism of sodium-containing substances and methane combustion. The results showed that NaHCO3 powder driven by high-pressure gas jets reduces the average propagation speed of flame fronts and the rising rate of overpressure. The presence of porous barriers increases the turbulence intensity in the pipe and the travel time of the NaHCO3 particles. Thus, the contact time between the large particle powder and the flame increases, and the inhibiting effect on flame propagation gradually increases as the obstruction rate increases. NaHCO3 powder inhibits methane–air explosions through physical and chemical mechanisms. From a chemical perspective, sodium-containing radicals preferentially react with CO in the system to form CO2, reducing the production of H* and OH* radicals in the reaction system. The cycle of gaseous Na and NaOH also consumes H* and OH* radicals in the system, blocking the chain reaction.

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Spurting NH₄H₂PO₄ Powder to Prevent the Propagation of Gas Explosion along the Duct

Cited by 10 publications

References 31 publications

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

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

Experimental Study on the Isolation Effect of an Active Flame-Proof Device on a Gas Explosion in an Underground Coal Mine

Suppression of methane–air explosions using air-jet-driven NaHCO3 powder and porous barrier

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