Experimental Study on the Characteristics of Bicarbonate Inhibiting Soybean Meal Dust Explosion

doi:10.12068/j.issn.1005-3026.2024.12.015

Abstract

Abstract:

To investigate the explosion suppression characteristics of bicarbonate on soybean meal dust explosion， NaHCO₃， KHCO₃， and NH₄HCO₃ bicarbonate were selected as explosion suppression powders. The inhibitory effect of bicarbonate on soybean meal dust explosion was analyzed from parameters such as maximum explosion pressure P_ex， maximum explosion pressure rise rate （dP/dt）_ex， and explosion index K_st. The results showed that the explosion characteristic parameters of soybean meal dust with a mass concentration of 400 g/m³ were the highest， with a maximum explosion pressure of 0.763 MPa， a maximum explosion pressure rise rate of 24.8 MPa/s， and an explosion index of 6.7 MPa·m/s. As the mass fraction of bicarbonate powder increased， the explosion characteristic parameters showed a decreasing trend， and the inhibitory effect continued to increase. Under the same conditions， the explosion suppression performance of NH₄HCO₃>KHCO₃>NaHCO₃. Combined with thermogravimetric analysis and infrared spectroscopy analysis of explosion suppression powders， the explosion suppression mechanisms of three types of powders and the differences caused by different ions were explored.

Key words: dust explosion, explosion parameters, bicarbonate, inhibition mechanism, thermogravimetric analysis

CLC Number:

X 932

Jia-ling XU, Kai-li XU, Bo LIU. Experimental Study on the Characteristics of Bicarbonate Inhibiting Soybean Meal Dust Explosion[J]. Journal of Northeastern University(Natural Science), 2024, 45(12): 1798-1804.

Figures/Tables 15

Fig.1 Schematic diagram of spherical explosion experimental device

Fig.2 Particle size distribution of soybean meal dust

Fig.3 Particle size distribution of explosive suppression powders

Fig.4 The maximum explosion pressure and maximum

Fig.5 Explosion index of soybean meal dust explosion of soybean meal dust

Fig.6 Explosion pressure time diagram of mix dust with different mass fraction of explosion suppression powders

Fig.7 Comparison of explosion characteristic parameters of mixed dust with different mass fractions of

Fig.8 Time to reach maximum explosion pressure by adding different mass fractions of explosive suppression powders

Fig.9 Time to achieve maximum explosion pressure rise rate by adding different mass fractions of explosive suppression powders

Fig.10 TG-DTG-DSC curves of soybean meal dust

Fig.11 Thermal decomposition characteristics of three explosion suppression powders

Fig.12 TG curves of mixed dust

Fig.13 FTIR spectra of soybean meal dust

Fig.14 FTIR spectra of three explosion suppression powders

Fig.15 Schematic diagram of explosion suppression powders

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