Study on the effect and mechanism of Ca(H2PO4)2 and CaCO3 powders on inhibiting the explosion of titanium powder

Liu, Jiqing; Meng, Xiangbao; Yan, Ke; Wang, Zheng; Dai, Wenjiao; Wang, Zhifeng; Fang, Li‐Feng; Yang, Panpan; Yang, Linjun

doi:10.1016/j.powtec.2021.09.067

Cited by 33 publications

(5 citation statements)

References 30 publications

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“…From these figures, it is clear that the relations between the maximum propagation speed associated with C 2 H 4 explosion flame and powder concentration also show similar variations. According to the literature, high-quality inhibitors often significantly inhibit the propagation speed associated with explosion flames. − Clearly, high concentrations of KHCO 3 and KH 2 PO 4 powders are expected to be influential in inhibiting C 2 H 4 explosions.…”

Section: Resultsmentioning

confidence: 99%

Inhibition Effect of KHCO₃ and KH₂PO₄ on Ethylene Explosion

Wang

Yang

et al. 2023

ACS Omega

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The explosion risk of ethylene (C2H4) seriously hinders safe development of its production and processing. To reduce the harm caused by C2H4 explosion, an experimental study was conducted to assess the explosion inhibition characteristics of KHCO3 and KH2PO4 powders. The experiments were conducted based on the explosion overpressure and flame propagation of the 6.5% C2H4–air mixture in a 5 L semi-closed explosion duct. Both the physical and chemical inhibition characteristics of the inhibitors were mechanistically assessed. The results showed that the 6.5% C2H4 explosion pressure (P ex) decreases by increasing the concentration of KHCO3 or KH2PO4 powder. The inhibition effect of KHCO3 powder on the C2H4 system explosion pressure was better than that of the KH2PO4 powder under similar concentration conditions. Both powders significantly affected the flame propagation of the C2H4 explosion. Compared with KH2PO4 powder, KHCO3 powder had a better inhibition effect on the flame propagation speed, but its ability to reduce the flame luminance was less than KH2PO4 powder. Finally, the inhibition mechanism(s) of KHCO3 and KH2PO4 powders were revealed based on the powders’ thermal characteristics and gas-phase reaction.

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Section: Resultsmentioning

confidence: 99%

Inhibition Effect of KHCO₃ and KH₂PO₄ on Ethylene Explosion

Wang

Yang

et al. 2023

ACS Omega

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“…The ignition source is located in the center of the tank and is connected to the dust jet ignition time difference controller through a circuit. An ignition charge with a total mass of 2.4 g was used in this experiment, which was composed of 40% zirconium powder, 30% barium nitrate, and 30% barium peroxide, with a total energy of 10 kJ 13 …”

Section: Methodsmentioning

confidence: 99%

“…The lower part of the explosion tank is provided with a dust diffuser connected to the dust storage tank through the pipeline, and a solenoid with a total mass of 2.4 g was used in this experiment, which was composed of 40% zirconium powder, 30% barium nitrate, and 30% barium peroxide, with a total energy of 10 kJ. 13 Before the experiment, the ignition charge was connected to two electrodes in the explosion tank by wire, and the dust was loaded into the dust storage chamber. During the experiment, the air storage tank was pressurized to 2 MPa, and then the explosion tank was vacuumized to À0.06 MPa (GB/T-16426-1996) with a vacuum pump to ensure that the explosion tank was under atmospheric pressure when ignited.…”

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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“…The results indicate that adding 33% of a new chemical inhibitor can completely suppress the explosion of nano-Al powder. Liu et al 12 studied the inhibitory effect of different proportions of Ca(H 2 PO 4 ) 2 and CaCO 3 powders on the explosion of Ti powder using Hartmann and 20 L spherical explosive tank devices. The experiment showed that both Ca(H 2 PO 4 ) 2 and CaCO 3 had a certain inhibitory effect on the explosion of the Ti powder.…”

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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Study on the effect and mechanism of Ca(H2PO4)2 and CaCO3 powders on inhibiting the explosion of titanium powder

Cited by 33 publications

References 30 publications

Inhibition Effect of KHCO₃ and KH₂PO₄ on Ethylene Explosion

Inhibition Effect of KHCO₃ and KH₂PO₄ on Ethylene Explosion

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

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Study on the effect and mechanism of Ca(H2PO4)2 and CaCO3 powders on inhibiting the explosion of titanium powder

Cited by 33 publications

References 30 publications

Inhibition Effect of KHCO3 and KH2PO4 on Ethylene Explosion

Inhibition Effect of KHCO3 and KH2PO4 on Ethylene Explosion

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

Contact Info

Product

Resources

About

Inhibition Effect of KHCO₃ and KH₂PO₄ on Ethylene Explosion

Inhibition Effect of KHCO₃ and KH₂PO₄ on Ethylene Explosion