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Article

A Study on the Flame and Pressure Characteristics of Ultrafine Calcium Carbonate (CaCO3) Powder in Suppressing Gas Explosions

by
Guiyuan Li
1,
Zuohui Xu
1,*,
Sihan Ji
1,
Jingde Xu
1,
Yang Hu
1,
Junhai Liu
2 and
Zhie Wang
3
1
School of Safety Engineering, North China Institute of Science and Technology, Langfang 065201, China
2
College of Safety Science and Engineering, Anhui University of Science & Technology, Huainan 232001, China
3
Management Engineering School, Capital University of Economics and Business, Beijing 100070, China
*
Author to whom correspondence should be addressed.
Fire 2025, 8(5), 203; https://doi.org/10.3390/fire8050203
Submission received: 16 April 2025 / Revised: 8 May 2025 / Accepted: 16 May 2025 / Published: 20 May 2025
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Abstract

This study investigates the suppression effect of ultrafine CaCO3 powder on gas explosions through a series of experiments conducted in a medium-scale explosion tube (9.6 m in length) with varying concentrations of ultrafine CaCO3. The gas explosion suppression concentration was established at 9.5%. The results indicate that, at concentrations of 125 g/m3 and 300 g/m3, ultrafine CaCO3 powder significantly reduced the flame propagation speed of the gas explosion. Among the concentrations that did not fully suppress the gas explosion, 20 g/m3 effectively mitigated the flame propagation speed and overpressure throughout the entire process. The concentration of 75 g/m3 demonstrated a suppression–promotion–suppression–promotion pattern regarding the flame propagation rate, with significant fluctuations observed throughout the process. While the maximum suppression rate reached 60.9%, the maximum promotion rate was 131.12%. At 10 g/m3, the flame propagation rate initially increased before decreasing, with the most effective suppression observed within the first 6.6 m, where flame propagation suppression increased rapidly from 58.13% to 74.82%, and the peak explosion overpressure was reduced by up to 62.94%. These findings contribute valuable insights for the development of effective gas explosion suppression strategies in mining environments.
Keywords: gas explosion; powder-based explosion suppression; CaCO3 powder; flame propagation velocity; pressure peak gas explosion; powder-based explosion suppression; CaCO3 powder; flame propagation velocity; pressure peak

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MDPI and ACS Style

Li, G.; Xu, Z.; Ji, S.; Xu, J.; Hu, Y.; Liu, J.; Wang, Z. A Study on the Flame and Pressure Characteristics of Ultrafine Calcium Carbonate (CaCO3) Powder in Suppressing Gas Explosions. Fire 2025, 8, 203. https://doi.org/10.3390/fire8050203

AMA Style

Li G, Xu Z, Ji S, Xu J, Hu Y, Liu J, Wang Z. A Study on the Flame and Pressure Characteristics of Ultrafine Calcium Carbonate (CaCO3) Powder in Suppressing Gas Explosions. Fire. 2025; 8(5):203. https://doi.org/10.3390/fire8050203

Chicago/Turabian Style

Li, Guiyuan, Zuohui Xu, Sihan Ji, Jingde Xu, Yang Hu, Junhai Liu, and Zhie Wang. 2025. "A Study on the Flame and Pressure Characteristics of Ultrafine Calcium Carbonate (CaCO3) Powder in Suppressing Gas Explosions" Fire 8, no. 5: 203. https://doi.org/10.3390/fire8050203

APA Style

Li, G., Xu, Z., Ji, S., Xu, J., Hu, Y., Liu, J., & Wang, Z. (2025). A Study on the Flame and Pressure Characteristics of Ultrafine Calcium Carbonate (CaCO3) Powder in Suppressing Gas Explosions. Fire, 8(5), 203. https://doi.org/10.3390/fire8050203

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