Coupling relationship between flame velocity and overpressure of butane explosion inhibited by synergistic effect of nanohydrophobic SiO<sub>2</sub>

XIE Jibiao; ZHANG Jiaqi; DING Ce; WANG Xiaoli

doi:10.11883/bzycj-2021-0016

Volume 41 Issue 9

Sep. 2021

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Article Navigation > Explosion And Shock Waves > 2021 > 41(9): 095402

XIE Jibiao, ZHANG Jiaqi, DING Ce, WANG Xiaoli. Coupling relationship between flame velocity and overpressure of butane explosion inhibited by synergistic effect of nanohydrophobic SiO2[J]. Explosion And Shock Waves, 2021, 41(9): 095402. doi: 10.11883/bzycj-2021-0016

Citation:

XIE Jibiao, ZHANG Jiaqi, DING Ce, WANG Xiaoli. Coupling relationship between flame velocity and overpressure of butane explosion inhibited by synergistic effect of nanohydrophobic SiO₂[J]. Explosion And Shock Waves, 2021, 41(9): 095402. doi: 10.11883/bzycj-2021-0016

Citation:

XIE Jibiao, ZHANG Jiaqi, DING Ce, WANG Xiaoli. Coupling relationship between flame velocity and overpressure of butane explosion inhibited by synergistic effect of nanohydrophobic SiO₂[J]. Explosion And Shock Waves, 2021, 41(9): 095402. doi: 10.11883/bzycj-2021-0016

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Coupling relationship between flame velocity and overpressure of butane explosion inhibited by synergistic effect of nanohydrophobic SiO₂

doi: 10.11883/bzycj-2021-0016

College of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China

Received Date: 2021-01-13
Rev Recd Date: 2021-03-22

Available Online: 2021-08-26

Publish Date: 2021-09-14

Abstract

Abstract

In order to explore the coupling of flame propagation velocity and pressure in butane gas explosion under the action of hydrophobic SiO₂ powder as flame retardant and flow-enhancing additive, experiments were carried out on a self-designed and constructed $\varnothing$ 100 mm×1 000 mm explosion test platform based on LabVIEW system. The agglomeration of powder and the mechanism of powder explosion suppression were analyzed through energy dispersive spectrometer (EDS) and thermogravimetric (TG). The effects of different proportion and concentration of hydrophobic nano SiO₂ powder on improving the flowability of CaCO₃ powder and synergistically inhibiting butane explosion,and the coupling relationship between flame propagation velocity and pressure change were studied. The results show that the addition of hydrophobic SiO₂ can reduce the angle of repose of the mixed powder and enhance the flowability. The residual amount of the powder decreases after spraying the powder, which proves that the diffusion effect and storability of the powder have been improved. Meanwhile, changing the proportion and concentration of the mixed powder has a significant effect on the combustion reaction. Within a certain concentration range, the powder is combined with the free radicals in the combustion area through larger specific surface area and pyrolysis, which significantly reduces the flame propagation velocity and explosion overpressure. However, excessive powder concentration promotes the explosion at the early stage, and the inhibition effect of the two powders on explosion is better than that of the single powder. Under the inhibition of the mixed powder, the flame velocity almost drops to the minimum when the explosion pressure reaches the maximum, and the pressure waveform changes from continuous rise to a single-peak curve. In addition, when the concentration is 106 g/m³ and the two powders are mixed in a mass ratio of 1∶1, the explosion suppression effect on 4.20% volume fraction butane-air mixture is the best, and the attenuation rates of average flame propagation velocity and maximum explosion overpressure are 85.5% and 59.6%, respectively, which effectively suppress the flame propagation velocity and explosion pressure.
- hydrophobic,
- nanometer powder,
- explosion,
- synergistic inhibition,
- propagation velocity,
- overpressure

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References(23)

References

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