Characteristics of Foamed Gel for Coal Spontaneous Combustion Prevention and Control

Zhang, Leilin; Shi, Biming; Qin, Botao; Wu, Qing; Dao, Vanchi

doi:10.1080/00102202.2016.1264942

Cited by 28 publications

(5 citation statements)

References 33 publications

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“…5,36 Therefore, understanding the characteristics of coal spontaneous combustion and developing preventative technology is crucial. 6 Conventional techniques adopted to prevent and control coal spontaneous combustion are irrigation with water and loess mud. 7 However, water and loess mud are unable to completely cover areas affected by the spontaneous combustion of coal.…”

Section: Introductionmentioning

confidence: 99%

Inhibiting effect of CO₂ on the oxidative combustion thermodynamics of coal

Ren

Deng

et al. 2019

RSC Adv.

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A thermal analysis experiment was conducted in O 2 /N 2 /CO 2 and O 2 /N 2 atmospheres (O 2 concentrations were 21, 14, 8, and CO 2 concentrations were 0, 39, 46, 52) to investigate the thermal behavior of coal oxidation and combustion. Results demonstrated that an elevated CO 2 concentration or decreased O 2 concentration had a delaying effect on the thermogravimetric analysis and differential scanning calorimetry (DSC) curves; moreover, the characteristic temperatures were substantially augmented.When the O 2 concentration was 21 vol%, the total heat released by coals A (highly volatile bituminous coal) and B (anthracite coal) decreased by 5.8% and 4.1%, respectively, after CO 2 addition. The comprehensive combustion performance index was also lowered. The DSC curve can be divided into two exothermic peaks, and the ratio of the peak 1 to peak 2 areas decreased with the addition of CO 2, which indicated that CO 2 inhibited the oxidation of the active functional groups of coal structures.Apparent activation energy in O 2 /CO 2 /N 2 was less than that in O 2 /N 2 .

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Section: Introductionmentioning

confidence: 99%

Inhibiting effect of CO₂ on the oxidative combustion thermodynamics of coal

Ren

Deng

et al. 2019

RSC Adv.

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“…Gel foam is an advanced form of three-phase foam technology and exhibits superior solid–water retention and fluidity; additionally, it is widely applicable. Gel foam is extensively used for fire prevention and extinguishing fires in coal mines . Many researchers have developed unique materials to suppress coal combustion.…”

Section: Introductionmentioning

confidence: 99%

“…Gel foam is extensively used for fire prevention and extinguishing fires in coal mines. 15 Many researchers have developed unique materials to suppress coal combustion. Xi et al 16 developed a novel thermoplastic foam material synthesized from a sodium silicate solution, organic acids, polycaprolactone, and poly(ethylene oxide) to suppress spontaneous coal combustion.…”

Section: Introductionmentioning

confidence: 99%

Study on the Inhibition Characteristics of Coal Spontaneous Combustion by Silica Gel Foam

Zhang,

Wen

et al. 2024

ACS Omega

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The spontaneous combustion of residual coal in abandoned mining areas severely affects the safe and efficient extraction of coal, employee occupational health, and regional environmental ecology. A technical measure for preventing and controlling the spontaneous combustion of residual coal involves injecting antispontaneous combustion materials into abandoned areas. In this study, the composition, preparation, and mechanism of action of silica gel foam, a material used to suppress spontaneous combustion during coal mining, were investigated to improve the performance of materials designed to prevent spontaneous combustion in abandoned areas. The inhibitory efficiency improved, and the mechanical strength and stability of the foam liquid film increased upon adding modified antioxidants and nanosilica particles to the gel foam. Macro performance tests, microstructural characterization, and chemical inhibition mechanism analyses verified the efficacy of silica gel foam for suppressing spontaneous combustion. The air leakage resistance of the silica gel foam effectively increased the air leakage resistance of the coal samples at different pressures. New radicals formed during the spontaneous combustion of coal comprising different inhibitors, as indicated by the g-factor results of electron paramagnetic resonance (EPR) spectroscopy analysis; the formation of radicals initially decreased and then increased when the inhibitor material changed. The concentration of free radicals decreased markedly during the spontaneous combustion process of both raw and inhibited coal samples at low oxidation temperatures (∼60−100 °C), indicating a marked inhibitory effect.

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“…The antioxidant can be dispersed uniformly on the coal surface, providing an environmentally friendly and efficient method to prevent the spontaneous combustion of coal. Zhang − and other researchers independently prepared a foaming gel and analyzed the effects of the system composition and foaming agent dosage, as well as the type and dosage of the polymer on the foam properties. In addition, the inhibition characteristics and excellent sustained-release performance of the multiphase foaming gel were investigated experimentally and theoretically.…”

Section: Introductionmentioning

confidence: 99%

Prevention and Control of Coal Spontaneous Combustion by Novel Phenolic Resin–Clay Thermosetting Ultrafine Particle Aerosol

Wang

Tang

et al. 2022

Energy Fuels

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In this study, thermally consolidating ultrafine aerosol particles (<100 μm) were prepared using a phenolic resin, kaolin, montmorillonite, and hydrotalcite in a ratio of 68:16:8:8 and subsequently used to control hidden spontaneous fires in underground coal mines. Thermogravimetric/differential scanning calorimetry analysis revealed that the aerosol exerts a significant suppression effect on the exotherm at 360–600 °C, and after treatment, the oxidation kinetic parameters increased by 65.6%. From Fourier transform infrared spectral results, it was found that functional groups in coal (such as −COOH and −OH) varied clearly. Scanning electron microscopy images revealed that aerosol particles from dense insulation layers exhibit a remarkable thermosetting property at temperatures greater than 200 °C. The energy level, charge distribution, and thermodynamic parameters of the composite process were calculated using quantum simulations for the shells generated by curing the optimized PF-minerals at temperatures greater than 200 °C. The maximum contribution of the bidentate ligand to the highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital in the PF-mineral complexes decreased by five atoms, and the maximum energy difference of the frontier orbitals reached 3.586647 eV. The absolute value of the HOMO energy increased by 48.1%, indicating that the complex formed by the phenolic resin is hardly oxidized. An aerosol transport experiment and simulated fire extinguishing experiment confirmed that the aerosols form a stable system in air and that ultrafine particle aerosol materials effectively suppress fires that are caused by the spontaneous combustion of coal.

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Characteristics of Foamed Gel for Coal Spontaneous Combustion Prevention and Control

Cited by 28 publications

References 33 publications

Inhibiting effect of CO₂ on the oxidative combustion thermodynamics of coal

Inhibiting effect of CO₂ on the oxidative combustion thermodynamics of coal

Study on the Inhibition Characteristics of Coal Spontaneous Combustion by Silica Gel Foam

Prevention and Control of Coal Spontaneous Combustion by Novel Phenolic Resin–Clay Thermosetting Ultrafine Particle Aerosol

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Characteristics of Foamed Gel for Coal Spontaneous Combustion Prevention and Control

Cited by 28 publications

References 33 publications

Inhibiting effect of CO2 on the oxidative combustion thermodynamics of coal

Inhibiting effect of CO2 on the oxidative combustion thermodynamics of coal

Study on the Inhibition Characteristics of Coal Spontaneous Combustion by Silica Gel Foam

Prevention and Control of Coal Spontaneous Combustion by Novel Phenolic Resin–Clay Thermosetting Ultrafine Particle Aerosol

Contact Info

Product

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Inhibiting effect of CO₂ on the oxidative combustion thermodynamics of coal

Inhibiting effect of CO₂ on the oxidative combustion thermodynamics of coal