Flame propagation mechanism of nano-scale PMMA dust explosion

Zhang, Xinyan; Gao, Wei; Yu, Jianliang; Zhang, Yansong; Chen, Haiyan; Huang, Xingwang

doi:10.1016/j.powtec.2019.12.056

Cited by 22 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under the high-temperature effect of the explosion flame, powder coatings undergo cross-linking and solidification between particles, forming a dense and stable coating layer and experiencing varying degrees of agglomeration and solidification phenomena. Based on the results of scanning electron microscopy and previous research on the explosion mechanism of organic dust, − a clear understanding of the explosion mechanism of electrostatic spraying powder can be obtained. As shown in Figure , the explosive development process of powder coating particles is concentrated in a three-phase system, where solid particles, molten particles, and combustible gases coexist.…”

Section: Results and Discussionmentioning

confidence: 99%

Study on Explosion Characteristics and Mechanism of Electrostatic Spray Powder

Qin,

Zhang,

Shi

et al. 2024

ACS Omega

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Study on Explosion Characteristics and Mechanism of Electrostatic Spray Powder

Qin,

Zhang,

Shi

et al. 2024

ACS Omega

Self Cite

View full text Add to dashboard Cite

show abstract

“…Each test is copied five times. This study is based on the image edge detection algorithm in MATLAB programs to recognize and extract flame edges …”

Section: Methodsmentioning

confidence: 99%

Research on the Inhibition Effect of NaCl on the Explosion of Mg–Al Alloy Powder

Qin,

Wei,

Shi

et al. 2024

ACS Omega

Self Cite

View full text Add to dashboard Cite

A study was conducted on the explosion overpressure and flame propagation law of magnesium−aluminum (Mg−Al) alloy powder, and the suppression mechanism of sodium chloride (NaCl) on the explosion of magnesium−aluminum alloy powder was explored. Adding NaCl powder can effectively reduce the explosion pressure, flame front position, and flame propagation speed. The higher the amount of NaCl powder added, the lower the explosion pressure of magnesium−aluminum alloy powder, the slower the flame propagation speed, and the lower the flame brightness. NaCl adsorbed on Mg−Al alloy powder isolated heat transfer and played a cooling role. The Cl − produced by NaCl decomposition will react with the free radicals H + and OH − in the reaction system, which will reduce the concentration of H + and OH − in the combustion process and hinder the propagation and expansion of the flame. The research results provide theoretical guidance for the explosion prevention of Mg−Al alloy powder and the preparation of a physical−chemical compound explosion suppressor in the later stage.

show abstract

Flame propagation and explosion characteristics of food‐based dust as a function of dust concentration

Sulaiman,

Mohd Mokhtar,

Wan Sulaiman

et al. 2024

Process Safety Progress

View full text Add to dashboard Cite

A comprehensive grasp of the mechanisms and characteristics of dust explosions holds significant importance in guiding safe operations and risk mitigation measures. This research examined the impact of dust concentration on the flame propagation and explosion characteristics of rice flour and tea dust. The explosion test was carried out in a 20‐L spherical chamber and demonstrated that elevating the dust concentration led to increased explosion pressure and flame velocity. Simultaneously, it decreased both the rise initiation time and the peak time. This observation can be attributed to more particles ignited by heat radiation per unit volume and a greater frequency of effective collisions between reactant molecules. These factors enhance mass and heat transfer in preheating and reaction zones, producing more violent pyrolysis. However, tea dust exhibited a slower flame propagation with weaker turbulent flame intensity due to its higher moisture content and larger particle size than rice flour.

show abstract

Flame propagation mechanism of nano-scale PMMA dust explosion

Cited by 22 publications

References 28 publications

Study on Explosion Characteristics and Mechanism of Electrostatic Spray Powder

Study on Explosion Characteristics and Mechanism of Electrostatic Spray Powder

Research on the Inhibition Effect of NaCl on the Explosion of Mg–Al Alloy Powder

Flame propagation and explosion characteristics of food‐based dust as a function of dust concentration

Contact Info

Product

Resources

About