Controlled-release inhibitor for preventing the spontaneous combustion of coal

Qi, Xuyao; Wei, Cunxiang; Li, Qizhong; Zhang, Libin

doi:10.1007/s11069-016-2224-1

Cited by 63 publications

(24 citation statements)

References 17 publications

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“…With the loss of water, their inhibition efficiency is greatly decreased (Li et al, 2012b). In maintaining the high efficiency of inhibiting spontaneous coal combustion, the application of temperature sensitive materials as coating to allow the release of inhibitors at a specific temperature was investigated (Cui et al, 2017;Li et al, 2016a;Ma et al, 2016Ma et al, , 2017Qi et al, 2016). However, they did not consider the effect of diffusion and action range of inhibitors, and it was found that the covered area of coal was extremely limited after solid or liquid inhibitors were released.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on controlled-release inhibitor foam for restraining spontaneous combustion of coal

Zhang

Yang

Xie³

et al. 2020

Energy Exploration & Exploitation

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A new method is proposed based on temperature-controlled self-reaction to generate and release inhibitors in the form of foam at a specific temperature, which can overcome the disadvantages of short effective time and low efficiency in the inhibition of the spontaneous combustion of coal when inhibitors are released in advance, and greatly increase the action range of inhibitor through foam diffusion. The proposed temperature-controlled foaming system was prepared with hollow spheres as solution carriers, NaHCO3 and acetic acid as basic reactants, reaction-generated CO2 as foaming gas, sodium dodecyl sulfate and sodium carboxymethyl cellulose as foaming additives, NaCl, MgCl2 and CaCl2 as additives to enhance inhibition effect, and temperature sensitive paraffin as insulating material to generate and release inhibitor foam. The effects of releasing foam on restraining the spontaneous combustion of coal were studied based on the experimental analysis of the optimum ratio of reactants and additives, hollow sphere parameters, released temperature of the foam and variation rule of CO generated by coal oxidation. The obtained results showed that the released temperature of foam was 59–61°C and the covered area of pulverized coal by inhibitor foam was 12.9–13.9 times higher than when it was directly wetted by inhibitor solution. The total effects of inhibition and inerting were achieved after pulverized coal was wetted with inhibitor foam and the efficiency of restraining the spontaneous combustion of coal reached 88.51–97.06% when temperature was increased to 160°C.

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Section: Introductionmentioning

confidence: 99%

Experimental study on controlled-release inhibitor foam for restraining spontaneous combustion of coal

Zhang

Yang

Xie³

et al. 2020

Energy Exploration & Exploitation

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“…Dou et al studied a type of slow‐release controllable material for inhibiting spontaneous combustion of coal. In addition, Qi et al proposed that natural antioxidants, such as tea polyphenols, can also be used to inhibit coal oxidation. Xue and Hu believed that polymer hydrogels have broad application prospects in the field of fire prevention and fire extinguishing in coal mines.…”

Section: Introductionmentioning

confidence: 99%

A novel sodium carboxymethyl ellulose/aluminium citrate gel for extinguishing spontaneous fire in coal mines

Zhou

Tang

2018

Fire and Materials

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Summary Spontaneous combustion of coal is one of the main disasters affecting safe production in mines. A sodium carboxymethyl cellulose/aluminium citrate gel for prevention and extinguishing of mine fires was prepared. Based on a temperature‐controlled experiment, the authors studied the influences of the gel on indicator gases generated in the spontaneous combustion of coal, crossing point temperature, and activation energy. The results showed that the crossing point temperature of coal samples treated by the gel increased by more than 13.9°C and the activation energy rose by 7.17 to 16.34%. Moreover, the indicator gases, such as CO and C2H4 generated in the oxidation, decreased significantly. After treatment with the gel, the weight loss rate of the coal samples was reduced, and less energy was released. By using the self‐developed test platform (coal capacity of 2 m3), the spontaneous combustion of coal on the roof of a roadway was simulated, and the carboxymethyl cellulose/aluminium citrate gel was used for fire extinguishing. After injecting the gel, the temperature in the furnace rapidly decreased, and the concentration of O2 remained at less than 3%, without showing any after‐combustion effects.

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“…Li et al [10] selected six different types of antioxidants (oxygen-scavenger ascorbic acid, butylated hydroxytoluene, triphenyl phosphite, 2,2,6,6-tetramethyl-1-piperidine-noxyl free radical [TEMPO], edetic acid, and phytic acid) as inhibitors for low-temperature oxidation experiments, and found that TEMPO had the greatest inhibition effect. Qi et al [11] proposed a kind of controlled-release inhibitor that is made from the synthesis of halogen inhibitors, catechin, copolymers, solvents, and surfactants. Tang [12] used phosphates and MgCl 2 as synergistic inhibitors for suppressing the self-ignition of coal.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Iron-Based Deoxidizing Inhibitors for Coal Spontaneous Combustion Prevention

et al. 2018

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Abstract:To improve the prevention of spontaneous coal combustion, reduced iron powder and other ingredients should be added together to form an iron-based deoxidizing inhibitor, with the dual effect of oxygen consumption and inhibition. The oxygen consumption rate of the inhibitor was studied through experiments. According to the theory of coordination resistance, the coordination resistance of Fe 3+ was studied via the density functional method. Subsequently, a comparative experiment of the effects on spontaneous coal combustion was conducted. The research shows that several kinds of common resistance agents that are added to the reduced iron powder can consume oxygen. However, the rate of oxygen consumption varies. Fe 3+ produced by the reduced iron powder indicates a strong coordination resistance. When compared with traditional inhibitors of Mg 2+ , Fe 3+ has a stronger inhibition effect on the N, P, and S reactive groups in coal. The overall inhibitory effect is better than that of traditional inhibitors, because of the increased oxygen consumption and the coordination resistance of Fe 3+ on the basis of traditional inhibitors.

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Controlled-release inhibitor for preventing the spontaneous combustion of coal

Cited by 63 publications

References 17 publications

Experimental study on controlled-release inhibitor foam for restraining spontaneous combustion of coal

Experimental study on controlled-release inhibitor foam for restraining spontaneous combustion of coal

A novel sodium carboxymethyl ellulose/aluminium citrate gel for extinguishing spontaneous fire in coal mines

Study on the Effect of Iron-Based Deoxidizing Inhibitors for Coal Spontaneous Combustion Prevention

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