Inhibition of Four Inert Powders on the Minimum Ignition Energy of Sucrose Dust
Abstract
:1. Introduction
2. Experimental Section
2.1. Experimental Apparatus
2.2. Experimental Materials
2.3. Experimental Method
3. Results
3.1. Effect of Inert Powder of Mass Concentration on MIE of Sucrose Dust
3.2. Effect of Inert Powder Particle Size on MIE of Sucrose Dust
3.3. Effect of Inert Powder on Sucrose Flame
4. Discussion
5. Conclusions
- Four kinds of inert powders can enhance the MIE of sucrose dust. After adding inert powder into sucrose, the MIE of sucrose increases. The larger the mass concentration of inert powder, the more significant the increase in the MIE of sucrose dust.
- The smaller the particle size of inert powder, the more significant its impact on the MIE of sucrose dust. Under the condition of sucrose mass concentration of 417 g/m3 with a particle size of 48–74 μm, the mass fractions of NaHCO3 with particle size of 25–37, 38–47 and 48–74 μm to prevent sucrose from burning were 20, 20 and 25 wt%, respectively. The mass fractions of NH4H2PO4 with particle sizes of 25–37, 38–47 and 48–74 μm to make sucrose non-combustion were 30, 35 and 40 wt%, respectively. NaCl with particle sizes of 25–37, 38–47 and 48–74 μm made the mass fractions of sucrose non-combustion 35, 40 and 40 wt%, respectively. The mass fractions of 25–37, 38–47 and 48–74 μm Al(OH)3 to make sucrose non-combustion were 60 wt%. The effects of the four inert powders on the MIE of sucrose from strong to weak were NaHCO3 > NH4H2PO4 > NaCl > Al(OH)3.
- The effects of NaHCO3 and NH4H2PO4 on sucrose were mainly in the form of physical heat absorption and chemical reactions, while NaCl and Al(OH)3 had only physical effects. However, the thermal decomposition of NH4H2PO4 produced NH3, which is a combustible gas and may promote the combustion of sucrose, so the inhibitory ability of NH4H2PO4 is only slightly better than that of NaCl.
- In the process of flame propagation, inert powder can slow down the combustion of sucrose dust and reduce the flame height. The area below the ignition electrode of the Hartmann tube device is the area with high inert powder concentration, and there is no flame.
- NaHCO3 is an effective inert agent to reduce the explosion risk of sucrose powder. The smaller the particle size, the smaller the concentration required for the complete inactivation of sucrose powder. Adding a small amount of NaHCO3 can effectively improve the MIE of sucrose dust.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
MIE | Minimum Ignition Energy |
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Zhong, Y.; Li, X.; Jiang, J.; Liang, S.; Yang, Z.; Soar, J. Inhibition of Four Inert Powders on the Minimum Ignition Energy of Sucrose Dust. Processes 2022, 10, 405. https://doi.org/10.3390/pr10020405
Zhong Y, Li X, Jiang J, Liang S, Yang Z, Soar J. Inhibition of Four Inert Powders on the Minimum Ignition Energy of Sucrose Dust. Processes. 2022; 10(2):405. https://doi.org/10.3390/pr10020405
Chicago/Turabian StyleZhong, Yuankun, Xiaoquan Li, Juju Jiang, Siting Liang, Zhiwen Yang, and Jeffrey Soar. 2022. "Inhibition of Four Inert Powders on the Minimum Ignition Energy of Sucrose Dust" Processes 10, no. 2: 405. https://doi.org/10.3390/pr10020405