Explosion propagation in a dust removal pipeline under dust collector explosion

Pang, Lei; Cao, Jiaojiao; Xiao, Qiuping; Yang, Kai; Shi, Long

doi:10.1016/j.jlp.2021.104662

Cited by 24 publications

(11 citation statements)

References 36 publications

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“…The more energy is released, the greater the pressure is generated. However, when the incoming flow velocity is large (300 m/s), with the increase of the airflow velocity, the air will take away part of the heat during combustion and explosion of fuel, resulting in a reduction of the heat, so the combustion and explosion reaction between IPN fuel and oxygen cannot be sustained, which is also consistent with the above analysis (Pang et al , 2022; Wu et al , 2022).…”

Section: Resultssupporting

confidence: 82%

Explosion behaviors of IPN/air mixture at high temperature and high pressure

Wan

Wen²,

Zhang³

2022

HFF

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Purpose The reaction dynamics of combustible clouds at high temperatures and pressures are a common form of energy output in aerospace and explosion accidents. The cloud explosion process is often affected by the external initial conditions. This study aims to numerically study the effects of airflow velocity, initial temperature and fuel concentration on the explosion behavior of isopropyl nitrate/air mixture in a semiconstrained combustor. Design/methodology/approach The discrete-phase model was adopted to consider the interaction between the gas-phase and droplet particles. A wave model was applied to the droplet breakup. A finite rate/eddy dissipation model was used to simulate the explosion process of the fuel cloud. Findings The peak pressure and temperature growth rate both decrease with the increasing initial temperature (1,000–2,200 K) of the combustor at a lower airflow velocity. The peak pressure increases with the increase of airflow velocity (50–100 m/s), whereas the peak temperature is not sensitive to the initial high temperature. The peak pressure of the two-phase explosion decreases with concentration (200–1,500 g/m3), whereas the peak temperature first increases and then decreases as the concentration increases. Practical implications Chain explosion reactions often occur under high-temperature, high-pressure and turbulent conditions. This study aims to provide prevention and data support for a gas–liquid two-phase explosion. Originality/value Sustained turbulence is realized by continuously injecting air and liquid fuel into a semiconfined high-temperature and high-pressure combustor to obtain the reaction dynamic parameters of a two-phase explosion.

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Section: Resultssupporting

confidence: 82%

Explosion behaviors of IPN/air mixture at high temperature and high pressure

Wan

Wen²,

Zhang³

2022

HFF

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“…Multiple sets of explosion characteristics tests were conducted on three powder coatings, EPC, PPC, and APC, at a mass concentration range from 250 to 1250 g/m 3 . According to the test results of the explosion characteristics parameters of three powder coatings, the maximum explosion pressure P max of the three powder coatings was conducted on three powder coatings, epoxy, polyether, and acrylic, at a mass concentration range of 250−1250 g/m 3 According to the test results of the exploration characteristics parameters of the three powder coatings, the maximum exploration pressure P max of the three powder coatings is between 0.63 and 0.75 MPa, with APC > EPC > PPC. (dP/dt) max is between 44.5 and 85.4 MPa/s, APC > EPC ≈ PPC, and APC reaches its peak at a mass concentration of 1000 g/m 3 .…”

Section: Severity Of Dust Cloud Explosionmentioning

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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“…They found that the deposited dust amount, particle size, and dust layer thickness have an influence on the dust explosion parameters. Pang et al , designed a cylindrical and square vessel connected with a vent duct and analyzed the dynamic mechanism of dust explosion through a vent duct. Dong et al investigated methane–air explosions in a horizontal pipe closed at both ends with the deposited coal dust.…”

Section: Introductionmentioning

confidence: 99%

Influence of Dust Layers in Connecting Pipes on Explosion Propagation Characteristics of Flake Aluminum Powder in Cylindrical Interconnected Vessels

2023

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Aluminum dust explosion has become an important type of dust explosion accident. In the present work, an interconnected system is established to study the influence of accumulated dust layers in connecting pipes on explosion propagation characteristics. A high-precision computational fluid dynamics (CFD) method is applied to study the overpressure and flame development of aluminum powder explosion under the central ignition condition of two cylindrical vessels with a volume ratio of 1:5. The results show that pressure build-up in the secondary container is mainly due to the oscillating pressure wave. Moreover, compared with the ignition container, the thickness of the dust layer has a more obvious enhancement effect on the peak overpressure for the secondary container. When the ignition occurs in a large container, the dust layer is lifted in the connecting pipe under the action of the precursor pressure wave. After the jet flame enters the connecting pipe, the lifted aluminum dust participates in the explosion reaction, which significantly increases the explosion intensity. With the participation of the accumulated dust layer, the maximum overpressure of the explosion of flake aluminum dust in the interconnected system is higher than 30 bar, and the jet flame velocity is increased by 3 times. The present work can provide reference for the safety design of process equipment involving dust.

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Explosion propagation in a dust removal pipeline under dust collector explosion

Cited by 24 publications

References 36 publications

Explosion behaviors of IPN/air mixture at high temperature and high pressure

Explosion behaviors of IPN/air mixture at high temperature and high pressure

Study on Explosion Characteristics and Mechanism of Electrostatic Spray Powder

Influence of Dust Layers in Connecting Pipes on Explosion Propagation Characteristics of Flake Aluminum Powder in Cylindrical Interconnected Vessels

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