Study on suppression of coal dust explosion by superfine NaHCO3/shell powder composite suppressant

Zhang, Yansong; Wu, Guangan; Cai, Lu; Zhang, Jie; Wei, Xiangrui; Wang, Xiang

doi:10.1016/j.powtec.2021.08.037

Cited by 38 publications

(5 citation statements)

References 48 publications

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“…Therefore, the ice scaffolding will be quickly dissolved in the second solvent, with only the target materials left as a solid phase in the solution, and the structure of target materials formed inside the ice will be preserved. Sodium bicarbonate, − baking soda, and ammonium dihydrogen phosphate, fire extinguishing agents, , are soluble in water and insoluble in ethanol. NaHCO 3 or (NH 4 )(H 2 PO 4 ) in water with different concentrations was used to produce nanoparticles by the freeze-dissolving method, which were compared with nanoparticles generated by freeze-drying, respectively.…”

Section: Introductionmentioning

confidence: 99%

Freeze-Dissolving Method: A Fast Green Technology for Producing Nanoparticles and Ultrafine Powder

Wang

Luo

et al. 2022

ACS Sustainable Chem. Eng.

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A new technology, a freeze-dissolving method, has been developed to isolate nanoparticles or ultrafine powder and is a more efficient and sustainable method than the traditional freeze-drying method. In this work, frozen spherical ice particles were produced with an aqueous solution of sodium bicarbonate or ammonium dihydrogen phosphate at various concentrations to generate nanoparticles of NaHCO 3 or (NH 4 )(H 2 PO 4 ). The freeze-drying method sublimates ice, and nanoparticles of NaHCO 3 or (NH 4 )(H 2 PO 4 ) in the ice templates remain. The freeze-dissolving method dissolves ice particles in a low freezing point solvent at temperatures below 0 °C, and then, nanoparticles of NaHCO 3 or (NH 4 )(H 2 PO 4 ) can be isolated after filtration. The freeze-dissolving method is 100 times faster with about 100 times less energy consumption than the freeze-drying method as demonstrated in this work with a much smaller facility footprint and produces the same quantity of nanoparticles with a more uniform size distribution.

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Section: Introductionmentioning

confidence: 99%

Freeze-Dissolving Method: A Fast Green Technology for Producing Nanoparticles and Ultrafine Powder

Wang

Luo

et al. 2022

ACS Sustainable Chem. Eng.

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“…High-pressure air of 2 MPa is filled into the gas storage tank, and the vacuum pumping device is started to vacuum the explosion tank to −0.06 MPa. This achieves the experimental condition of the initial environmental pressure of the powder at the time of ignition being standard atmospheric pressure. , Finally, the experimental program is initiated through the control system for the experiment, and the data collection system collects pressure data. After the action of the powder spraying system, the ignition system delays the ignition by 60 ms to ensure full diffusion of dust at the ignition time.…”

Section: Experimental Sectionmentioning

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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“…The commonly used gas/dust explosion suppression methods currently include ultrafine water mist, inert gas, solid powder, and gas–solid two-phase explosion suppressants, , which have different effects on different types of combustion explosions. Especially some inert gases and ultrafine water mist can undergo chemical reactions with particles such as magnesium and aluminum .…”

Section: Introductionmentioning

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

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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.

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Study on suppression of coal dust explosion by superfine NaHCO3/shell powder composite suppressant

Cited by 38 publications

References 48 publications

Freeze-Dissolving Method: A Fast Green Technology for Producing Nanoparticles and Ultrafine Powder

Freeze-Dissolving Method: A Fast Green Technology for Producing Nanoparticles and Ultrafine 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

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