Research on flame propagation and explosion overpressure of oil shale dust explosion suppression by NaHCO3

Liu, Yang; Zhang, Yansong; Meng, Xiangbao; Yan, Ke; Wang, Zhen; Liu, Jiqing; Wang, Zhifeng; Yang, Panpan; Dai, Wenjiao; Li, Fang

doi:10.1016/j.fuel.2021.122778

Cited by 27 publications

(3 citation statements)

References 27 publications

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“…The pressure recorder was started, and the solenoid valve was opened through the automatic control system. The dust was dispersed into the explosion tank to form a dust cloud, which was detonated after a delay of 60 ms. 14 At the same time, the experimental data acquisition system recorded the explosion pressure. The experiment was repeated three times for each group.…”

Section: Explosion Overpressure Experiments Of Iron Powder Explosionmentioning

confidence: 99%

Experimental study of explosion overpressure and flame propagation of micro‐sized and nanosized iron powder

Meng

Wang

Zhang

et al. 2022

Process Safety Progress

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In order to study the explosion of micro-sized and nanosized iron powder, the explosion overpressure and flame propagation were measured in a 20-L near-spherical explosion pressure experiment and a Hartmann tube experiment. The explosion overpressure experiments show that the optimum explosion concentrations of microsized and nanosized iron powder are 750 and 375 g/m 3 , respectively. The maximum explosion pressure and the maximum explosion pressure rise rate of nanosized iron powder are 0.56 MPa and 46.41 MPa/s, which are 144% and 225% of that of microsized iron powder, respectively. Under the optimum explosion concentration, the explosion flame of nanosized iron powder is brighter, and the propagation time is shorter. The maximum propagation velocity of micro-sized and nanosized iron powder flame is 0.84 and 6.55 m/s, respectively, and the flame pulsation degree of micro-sized iron powder is larger. The spherical particles and the cracks on the surface of the product particles were observed in the micro images of the explosion products, and the explosion mechanism model of micro-sized and nanosized iron powder was obtained. It was observed that the deformation of micro-sized iron particles intensifies, forming regular and complete spherical iron oxide particles.

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Section: Explosion Overpressure Experiments Of Iron Powder Explosionmentioning

confidence: 99%

Experimental study of explosion overpressure and flame propagation of micro‐sized and nanosized iron powder

Meng

Wang

Zhang

et al. 2022

Process Safety Progress

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“…Huang et al 13 studied the inhibitory effect of ultrafine Mg(OH) 2 powders with different particle sizes and mass fractions on the explosion flame of sawdust, and the results showed that nanoscale Mg(OH) 2 had a better inhibitory effect on sawdust. 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.…”

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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“…These findings show that NaHCO3 is an effective inhibitor for combating combustible gas explosions. Liu et al [19] , Wei et al [20] , and Jiang et al [21] investigated the inhibitory effects of solid inhibitors on oil shale, coal, and aluminum dust flames. They found that small-sized NaHCO3 particles exhibit both physical and chemical inhibition effects, with chemical inhibition having a greater impact.…”

mentioning

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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Research on flame propagation and explosion overpressure of oil shale dust explosion suppression by NaHCO3

Cited by 27 publications

References 27 publications

Experimental study of explosion overpressure and flame propagation of micro‐sized and nanosized iron powder

Experimental study of explosion overpressure and flame propagation of micro‐sized and nanosized iron powder

Study on Explosion Characteristics and Mechanism of Electrostatic Spray Powder

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

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