Experimental study on the effect of preinhibition temperature on the spontaneous combustion of coal based on an MgCl2 solution

Lu, Wei; Guo, Baolong; Qi, Guansheng; Cheng, Weimin; Yang, Wenyu

doi:10.1016/j.fuel.2020.117032

Cited by 76 publications

(16 citation statements)

References 24 publications

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“…composite powder on the Al‐Si alloy dust explosion was shown in Figure 13. Phosphorus‐containing compounds had long been considered to have the ability to suppress flames due to gas‐phase chemical interactions with flames 3,36,37 . The composite powder was composed of KH 2 PO 4 and Mnt.…”

Section: Resultsmentioning

confidence: 99%

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Inhibition of aluminum‐silicon alloy dust explosion and flame byKH₂PO₄/montmorillonite composite powder

Qin

Meng

et al. 2021

Fire and Materials

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Summary To obtain a good explosive suppressant, KH2PO4/montmorillonite composite powder was prepared by the solvent‐antisolvent method by using montmorillonite as the carrier and KH2PO4 as the supported particles. Flame propagation inhibition and explosion inhibition of aluminum‐silicon alloy dust by the KH2PO4/montmorillonite composite powder were investigated in a vertical quartz glass combustion tube and 20‐L spherical explosive tank, respectively. The results showed that the flame propagation of aluminum‐silicon alloy dust was basically suppressed as the inerting ratio of KH2PO4/montmorillonite composite powder was 1.2, and the explosion of aluminum‐silicon alloy dust was basically inhibited as the inerting ratio of KH2PO4/montmorillonite composite powder was 1.8. The flame and explosion inhibition mechanism of KH2PO4/montmorillonite composite powder on aluminum‐silicon alloy dust was further analyzed in this paper.

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Section: Resultsmentioning

confidence: 99%

“…Phosphorus-containing compounds had long been considered to have the ability to suppress flames due to gas-phase chemical interactions with flames. 3,36,37 The composite powder was composed of…”

Section: Kh 2 Po 4 /Montmorillonite Composite Powder Characterizationmentioning

confidence: 99%

Inhibition of aluminum‐silicon alloy dust explosion and flame byKH₂PO₄/montmorillonite composite powder

Qin

Meng

et al. 2021

Fire and Materials

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“…Alternatively, chemical treatment methods are often used to change the composition of coal and consume its surface-active sites, thereby reducing the heat released during combustion. Some inhibitors, such as NaCl, MgCl 2 , and CaCl 2 , can effectively prevent contact between the coal and oxygen, as well as remove some of the heat accumulated during spontaneous combustion. − However, due to the flow of air and moisture evaporation, it is difficult to maintain the long-term inhibitory effect . Other inhibitors include oxidants such as permanganate, perchlorate, and peroxide, ionic liquids, − and inorganic salts such as Na 3 PO 4 and Mg(Ac) 2 .…”

Section: Introductionmentioning

confidence: 99%

Effects of Water-Soluble Sodium Compounds on the Microstructure and Combustion Performance of Shengli Lignite

Wang

Zhao

et al. 2021

ACS Omega

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Different water-soluble sodium compounds (NaCl, Na2CO3, and NaOH) were used to treat Shengli lignite, and the resulting effects on the microstructure and combustion performance of the coal were investigated. The results showed that Na2CO3 and NaOH had a significant impact on combustion performance of lignite, while NaCl did not. The Na2CO3-treated lignite showed two distinct weight-loss temperature regions, and after NaOH treatment, the main combustion peak of the sample moved to the high temperature. This indicates that both Na2CO3 and NaOH can inhibit the combustion of lignite, with the latter showing a greater effect. The FT-IR/XPS results revealed that Na+ interacted with the oxygen-containing functional groups in lignite to form a “–COONa” structure during the Na2CO3 and NaOH treatments. It is deduced that the inhibitory effect on combustion of lignite may be attributed to the stability of the “–COONa” structure, and the relative amount is directly correlated with the inhibitory effect. The XRD/Raman analysis indicated that the stability of the aromatic structure containing “–COOH” increased with the number of “–COONa” structures formed. Additionally, experiments with carboxyl-containing compounds further demonstrated that the number of oxygen-containing functional groups combined with Na was the main reason for the differences in the combustion performance of treated lignite.

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“…Based on the formation mechanism of CSC, scholars proposed many methods to prevent and control it, such as plugging, , inerting, cooling, and use of inhibitors, − all of which aimed to reduce the oxygen content and stop the oxidation reaction. Foam technology was a burgeoning and efficient technology to control CSC hazards, which combined the advantages of the above technologies.…”

Section: Introductionmentioning

confidence: 99%

Film-Forming Property and Oxygen Barrier Characteristic of Gel-Stabilized Foam Used for Controlling Spontaneous Combustion of Coal

Shi

Qin

2021

Energy Fuels

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In order to prolong the extinguishment period of foam, gel-stabilized foam with special film-forming properties and oxygen barrier characteristics was developed in this paper. The film formed from gel-stabilized foam would stop coal from coming into contact with oxygen and retarded the oxidation process and selfheating behavior of coal. Effects of composition concentrations including the thickening agent (TA) and crosslinking agent (CA) on film-forming properties were investigated by analyzing the film morphology formed from gel-stabilized foam. The results showed that increasing the TA concentration from 2 to 4 g/L would enhance the foam stability obviously, and the gel-stabilized foam after adding 4 g/L TA would form the fragmentized coverage film with some obvious holes. Furthermore, adding the CA into gelstabilized foam would be beneficial to form a whole film to cover coal, and the film structure became more complete when the CA was increased from 1 to 3 g/L. In addition, when foam was composed of 3 g/L CA and 4 g/L TA, it could form an unbroken film mainly ascribed to the strong chemical reaction between the TA and CA in foam. Experimental and theoretical analysis indicated that the forming process of the film mainly included gravity drainage of foam, connection of surface layers, and formation of a frame structure. The oxygen barrier characteristic test and FTIR analysis showed the excellent coverage ability of gel-stabilized foam, and it would form a layer of coverage film to prevent the combination of coal and oxygen. The excellent coverage ability of the film could be evidenced by more weak changes in contents of aliphatic hydrocarbons and oxygen-containing functional groups for coal covered by gel-stabilized foam, compared to other coal samples. The study provided a novel technology to control the oxidation process of coal.

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Experimental study on the effect of preinhibition temperature on the spontaneous combustion of coal based on an MgCl2 solution

Cited by 76 publications

References 24 publications

Inhibition of aluminum‐silicon alloy dust explosion and flame byKH₂PO₄/montmorillonite composite powder

Inhibition of aluminum‐silicon alloy dust explosion and flame byKH₂PO₄/montmorillonite composite powder

Effects of Water-Soluble Sodium Compounds on the Microstructure and Combustion Performance of Shengli Lignite

Film-Forming Property and Oxygen Barrier Characteristic of Gel-Stabilized Foam Used for Controlling Spontaneous Combustion of Coal

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Experimental study on the effect of preinhibition temperature on the spontaneous combustion of coal based on an MgCl2 solution

Cited by 76 publications

References 24 publications

Inhibition of aluminum‐silicon alloy dust explosion and flame byKH2PO4/montmorillonite composite powder

Inhibition of aluminum‐silicon alloy dust explosion and flame byKH2PO4/montmorillonite composite powder

Effects of Water-Soluble Sodium Compounds on the Microstructure and Combustion Performance of Shengli Lignite

Film-Forming Property and Oxygen Barrier Characteristic of Gel-Stabilized Foam Used for Controlling Spontaneous Combustion of Coal

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Inhibition of aluminum‐silicon alloy dust explosion and flame byKH₂PO₄/montmorillonite composite powder

Inhibition of aluminum‐silicon alloy dust explosion and flame byKH₂PO₄/montmorillonite composite powder