Rheological characteristics of foamed gel for mine fire control

Zhang, Leilin; Qin, Botao

doi:10.1002/fam.2283

Cited by 26 publications

(14 citation statements)

References 19 publications

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“…It was shown that 0.4% foaming agent, 0.3% thickener and 0.3% crosslinking agent could obtain a foam gel with high foaming ratio, strong stability and good fire resistance (Figure 14). Subsequently, at this concentration, the effects of the foaming ratio, addition of salts (NaCl, CaCl 2 and AlCl 3 ), pH value and temperature on the rheological properties of the foam gel were discussed [60]. The fire extinguishing time of thickening agent and crosslinking agent mixture at different concentrations was also examined [61].…”

Section: Polymer-containing Soft Matters For Coal Mine Disaster/hamentioning

confidence: 99%

Recent Progress in Polymer-Containing Soft Matters for Safe Mining of Coal

Wang

et al. 2019

Polymers

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Safe mining is the premise and guarantee of sustainable development of coal energy. Due to the combination of excellent properties of polymers and traditional soft matters, polymer-containing soft matters are playing an increasingly important role in mine disaster and hazard control. To summarize the valuable work in recent years and provide reference and inspiration for researchers in this field, this paper reviewed the recent research progress in polymer-containing soft matters with respect to mine dust control, mine fire control, mine gas control and mine roadway support. From the perspective role of polymers in a material system, we classify mine polymer-containing soft matters into two categories. The first is polymer additive materials, in which polymers are used as additives to modify fluid-like soft matters, such as dust-reducing agents (surfactant solution) and dust-suppressing foams. The second is polymer-based materials, in which polymers are used as a main component to form high performance solid-like soft matters, such as fire prevention gels, foam gels, gas hole sealing material and resin anchorage agent. The preparation principle, properties and application of these soft matters are comprehensively reviewed. Furthermore, future research directions are also suggested.

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Section: Polymer-containing Soft Matters For Coal Mine Disaster/hamentioning

confidence: 99%

Recent Progress in Polymer-Containing Soft Matters for Safe Mining of Coal

Wang

et al. 2019

Polymers

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“…After gelation, the bubbles are firmly trapped in the high viscosity gel film, which improves the elastic force and heat absorption ability of the foam, and can effectively reduce the flow of oxygen in goaf. After covering the coal body, a dense film can be formed on the surface of the foam body to permanently isolate oxygen, cover the high temperature fire source, and keep the surface of floating coal moist and prevent spontaneous combustion [8][9][10]. The theoretical and technical research on gel foam belongs to the research content of a new discipline, whose research results can effectively prevent coal spontaneous combustion and have very important theoretical and practical significance for ensuring safe mining in mines and constructing harmonious mining areas.…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature on the Properties of the New Gel Foam

Cao

2022

Advances in Transdisciplinary Engineering

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In order to prevent coal spontaneous combustion fire effectively, a new kind of fire-fighting material – gel foam was developed in this paper. The foaming volume and half-life of foaming agent at different concentrations were measured by ROSS-Miles. Four foaming agents with less dosage and higher foaming times were selected. Then different temperatures were set to test the temperature resistance of four foaming agents and record the foaming volume data. Through analyzing the experimental results, the three optimal foaming agents were selected for pairwise compounding. Through the compounding experiment, the compound foaming agent was prepared with mass fraction of 6‰ APG and AEC at a mass ratio of 4:3, and the foaming times reached 13 times. After the addition of foam stabilizer, the foaming times of the compound were up to 15 times at room temperature, and the glue forming time is 13min. The results show that the viscosity of gel foam decreases with the increase of temperature. The higher the temperature, the shorter the gelation time. The gel does not decompose at high temperatures.

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“…Low-temperature oxidation of coal has been extensively studied. [10][11][12][13][14][15][16][17][18] Thermogravimetric analysis is an effective technique for investigating the oxidation characteristics of coal. Zhu et al 14 studied some characteristic temperatures during coal spontaneous combustion by TG.…”

Section: Introductionmentioning

confidence: 99%

“…Low‐temperature oxidation of coal has been extensively studied 10‐18 . Thermogravimetric analysis is an effective technique for investigating the oxidation characteristics of coal.…”

Section: Introductionmentioning

confidence: 99%

The effect of soaking in increasingly alkaline aqueous solutions on the spontaneous combustion characteristics of bituminous coal

et al. 2021

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Summary The spontaneous combustion characteristics of residual air‐dried coal change after soaking, which can pose a threat to coal mining safety. To study the effects of increasing alkalinity, pH values (7–11), on the spontaneous combustion characteristics of coal, we conducted a number of experiments using thermogravimetry (TG) and Fourier‐transform infrared spectroscopy (FTIR). TG was used to investigate parameters including the ignition index ()Di, combustion characteristic index (S), combustion intensity index (Hf), and activation energy (E) to show any variations in oxidative exothermic characteristics of coal. The results showed that the values of Di and S of the coal samples after alkaline treatment, increased with the increasing pH values. However, the values of Hf and E followed the opposite trend. To further explain the reason behind these variations, we investigated functional groups of coal using FTIR. These results indicated that the active functional groups, including oxygen‐containing functional groups, methyl and methylene groups, of the coal, increased after alkaline treatment, which showed microscopically that the coal was more active after soaking. These parameter variations together illustrate that the oxidation activity of the coal was enhanced after the alkaline treatment, and that it is more prone to spontaneous combustion.

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Rheological characteristics of foamed gel for mine fire control

Cited by 26 publications

References 19 publications

Recent Progress in Polymer-Containing Soft Matters for Safe Mining of Coal

Recent Progress in Polymer-Containing Soft Matters for Safe Mining of Coal

Effects of Temperature on the Properties of the New Gel Foam

The effect of soaking in increasingly alkaline aqueous solutions on the spontaneous combustion characteristics of bituminous coal

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