The inhibiting effects of sodium carbonate on coal dust deflagration based on thermal methods

Lu, Kunlun; Chen, Xiaokun; Luo, Zhenmin; Wang, Yuanyuan; Yang, Shaoqiong; Zhao, Tenglong; Xiao, Yang

doi:10.1016/j.fuel.2021.123122

Cited by 48 publications

(17 citation statements)

References 54 publications

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“…Some previous studies also have related results on the suppression effect of inert dust on coal dust explosion; − to compare with the previous research results, in Table , it shows the comparison between the results of this paper and the previous research results of explosion suppression on P max . It is found that when the mass percentage of inert dust mixed into coal dust is 50%, the percentage reduction of P max by mixing CaCO 3 into coal dust in this study is 39.0%, while the percentage reduction of P max in previous research is 42.9%, indicating that the results obtained in this study are very close to the results obtained in previous studies.…”

Section: Resultsmentioning

confidence: 62%

“…If there is an ignition source, the coal dust will explode, and the consequences will be very serious. Therefore, the use of inert dust can effectively suppress the intensity of the explosion, prevent the spread of the explosion, and even completely suppress the occurrence of the explosion. , Even if a large amount of explosion-suppressing dust is required, it is also a safe and effective method to control explosion accidents, which is very important to ensure the safe production of coal mines. In addition, when suppressing coal dust explosion, if a smaller amount of inert dust can be used to effectively suppress the explosion, such inert dust should be selected.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

et al. 2022

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Coal is an important strategic resource in the world; coal production safety has always been widely concerned. In coal mine production, inert dust can effectively reduce coal dust explosion accidents in mine tunnels. To reveal the suppression effect of inert dust on lignite dust explosion, CaCO 3 , SiO 2 , and NH 4 H 2 PO 4 are selected for suppression experiments. It is found that the lignite dust explosion pressure decreases continuously as the mass percentages of inert dust mixed into lignite dust increase. By calculating the molar mass, the suppression effects of CaCO 3 and SiO 2 on lignite dust explosion are compared. The lignite dust no longer explodes when the mass percentage of NH 4 H 2 PO 4 dust mixed into lignite dust is 70%, indicating that NH 4 H 2 PO 4 is more effective than that of CaCO 3 and SiO 2 . The smaller the particle size of NH 4 H 2 PO 4 , the better the suppression effect on explosion. The lignite dust does not explode when the mass percentage of NH 4 H 2 PO 4 is 60% and the particle size of NH 4 H 2 PO 4 is 25–38 μm, which proves that decreasing the particle size of NH 4 H 2 PO 4 is important to suppress explosion. The research results are of great significance for grasping the explosion suppression effect of inert dust on lignite dust.

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Section: Resultsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

et al. 2022

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“…In this paper, two experimental equipments are used, one of which is used to test the coal dust explosion pressure, and the other is used to test the coal dust explosion flame. The author has already introduced the explosion flame test equipment in detail in the literature [29][30][31][32][33], so it will not be introduced again here. In the process of coal dust explosion flame test, the flame propagation distance increases with time.…”

Section: Experimental Equipmentsmentioning

confidence: 99%

“…Therefore, in order to suppress explosions more effectively, many types of inert dusts have been developed. But in the process of developing inert dust, not only the effectiveness of the suppression, but also the economics of the inert dust need to be considered [30,31]. With the continuous breakthroughs in explosion suppression technology, it is hopeful that coal dust explosions will no longer occur through explosion suppression methods in the future, which is also the research goal of this paper.…”

Section: Introductionmentioning

confidence: 99%

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

et al. 2023

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Coal dust explosion is a major accident affecting the safety of coal mine production. In order to control coal dust explosion, using inert dust to suppress explosion is one of the effective methods. Taking the gas-fat coal as the research object and CaCO3, NaCl, and NH4H2PO4 as the inert dust, the suppression effect of inert dust on gas-fat coal dust explosion pressure and flame is studied. It is found that when the gas-fat coal dust particle size is 48~58 ?m, both the maximum pressure and the farthest distance of flame reach the maximum value. Among the three inert dusts, NH4H2PO4 has the best suppression effect, followed by NaCl, and CaCO3 has the worst suppression effect on explosion. The smaller the particle size of NH4H2PO4, the better the explosion suppression effect. When the mass percentage of NH4H2PO4 mixed into gas-fat coal dust is 60%, and the particle size of NH4H2PO4 is 0~38 ?m, the explosion is completely suppressed, it is mainly due to the isolation of the coal dust particles from the oxygen and the dilution of the oxygen concentration.

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“…The prevention and mitigation of gas explosions have always been important topics in the field of process safety. , For the mining industry, the gas explosion induced by spontaneous coal combustion has caused a series of accidents and resulted in heavy property losses. − During this process, the main components that are generated from the oxidation of coal are H 2 , CO, and CH 4 . − Since the multicomponent combustible gas explosion involves more complicated physical and chemical mechanisms, investigating the explosion behavior is particularly important for the development of the corresponding mitigation and control technology …”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Influence of H₂/CO on the CH₄ Explosion Pressure and Thermal Behaviors

Zhang¹,

Zhou²,

Yang³

et al. 2022

ACS Omega

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In a spontaneous coal combustion environment and in the coal chemical process, multiple gases, such as CH 4 , H 2 , and CO, coexist, and explosion accidents are prone to occur. The causes of these disasters and the explosion characteristics are key to formulating preventive measures. To explore the effect of H 2 /CO on the explosion pressure and thermal behavior of methane–air, CH 4 with initial volume fractions of 7, 9.5, and 12%, which correspond to three states of oxygen enrichment, equivalence ratio, and oxygen depletion, was selected. Moreover, a mixed fuel system is composed of H 2 /CO with different volume ratios. A 20 L spherical gas explosion experimental system was used to test the peak explosion overpressure P max , the maximum explosion overpressure rise rate (d P /d t )max, and the corresponding time parameters of the H 2 /CO–CH 4 mixed system. Combined with the thermodynamic calculation model, laminar burning velocity S L , explosion heat loss q tra , and other parameters were obtained. The results show that due to the existence of the damping effect, CO has the dual characteristic of promoting or weakening methane explosions. Compared with CO, the effect of H 2 on the methane explosion is more significant, and the improvement or weakening of the laminar combustion rate of the reaction system by CO “lags” behind that of H 2 . The heat loss in the process of a gas explosion is affected by factors such as the heat release rate, the propagation speed of the combustion wave, and the heat dissipation effect of the container wall. When H 2 /CO increases the laminar burning velocity of the mixed system, the heat loss decreases accordingly. This study also found that the laminar burning velocity model of the mixed gas based on the ideal spherical flame propagation theory is not fully applicable to the H 2 /CO/CH 4 mixed system in a spherical closed space, and the calculation results have large errors when the mixed system is close to the upper limit of the explosion.

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The inhibiting effects of sodium carbonate on coal dust deflagration based on thermal methods

Cited by 48 publications

References 54 publications

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

Experimental Study of the Influence of H₂/CO on the CH₄ Explosion Pressure and Thermal Behaviors

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The inhibiting effects of sodium carbonate on coal dust deflagration based on thermal methods

Cited by 48 publications

References 54 publications

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

Experimental Study of the Influence of H2/CO on the CH4 Explosion Pressure and Thermal Behaviors

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Experimental Study of the Influence of H₂/CO on the CH₄ Explosion Pressure and Thermal Behaviors