Investigation on the performance and application of a new design of foam generator used for fire extinguishment in underground coal mines

Lu, Xinxiao; Zhu, Huangqiu; Hu, Chao; Zhao, Hongjin

doi:10.1080/00102202.2018.1480016

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…In view of the coal spontaneous combustion, the presently applied fire prevention and control technologies include grouting into the goaf, − inert gas injection, spraying composite inhibitor, composite gel injection, , liquid nitrogen injection, − and injection of colloidal material. − However, there were some disadvantages for these traditional technologies because of their short effective duration, weak stacking ability, poor fluidity, and high cost. − Therefore, foam technology was proposed to inhibit spontaneous combustion of coal in goaf areas as a result of its superior advantages, e.g., low density, excellent transportation performance in the pipeline, and excellent ability to spread and stack. − In the field of extinguishing fires, aqueous foam has been widely used to extinguish methanol pool fires, forest fires, and coal fires. − However, traditional aqueous foam was always unsatisfactory as a result of its quick drainage and weak stability. Especially for the foam used to inhibit spontaneous combustion of coal, it did not have long-term effectiveness to retard the oxidation of coal.…”

Section: Introductionmentioning

confidence: 99%

Delineation and Prevention of the Spontaneous Combustion Dangerous Area of Coal in a Regenerated Roof: A Case Study in the Zhoujing Coal Mine, China

et al. 2020

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Spontaneous coal combustion in a regenerated roof is difficult to find, and the awareness of prevention is relatively weak. To effectively delineate the range of the danger area, the characteristic parameters of spontaneous coal combustion were tested. The result shows that carbon monoxide (CO) was chosen as the index gas, and the relationship between the oxygen consumption rate and oxygen concentration was fitted linearly. Mathematical models of the air speed field and oxygen concentration field were derived, and a physical model of the regenerated roof was established. On the basis of COMSOL Multiphysics simulation, the test value and predicted value of air speed and oxygen concentration were compared with good similarity. The danger area of spontaneous coal combustion was determined by the two indices of oxygen concentration and air speed with ranges of 1.35–6 and 0.60–3.02 m, respectively. A polyacrylamide–particle-stabilized foam (PPSF) with an average pore size of 165 μm and pore wall thickness of 30.5 μm was prepared in batch mode using a homemade foam-generating device. Optical microstructure characterization showed that the mixed powder can be distributed evenly in the liquid film and that polyacrylamide as a vesicular liquid membrane carrier presented a network structure. The formation mechanism of the foam was presented in a schematic diagram. The PPSF was injected into the delineated danger area of 350 m3, and the temperature and concentration of CO decreased to 32 and 29 °C and 5 and 22 ppm, respectively. All of these results indicated that PPSF can effectively inhibit spontaneous coal combustion in the regenerated roof.

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Section: Introductionmentioning

confidence: 99%

Delineation and Prevention of the Spontaneous Combustion Dangerous Area of Coal in a Regenerated Roof: A Case Study in the Zhoujing Coal Mine, China

et al. 2020

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“…The problem is that the added concentration of foaming agents is relatively high. For example, the concentration of foaming agents for firefighting is 0.8%-3% [22,28,29], and the foaming agents for dust suppression are used at a concentration of 0.5%-3% [30,31]. The high economic cost severely restricts the widespread application of foam extinguishing technology and foam dust suppression technology.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Foaming Ability of Surfactant Solutions by Water-Soluble Polymers: Experiment and Molecular Dynamics Simulation

Wang

et al. 2020

Polymers

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Aqueous foam is widely used in fire extinguishing and dust suppression technologies. Improving the foaming ability is the key to reducing the added concentration of foaming agents as well as the economic cost. In this work, the effect of a water-soluble polymer (polyvinyl alcohol, PVA) on the foaming ability of anionic surfactant (sodium dodecyl ether sulfate, SDES) was studied by an experiment and molecular dynamics simulation. The experimental results showed that PVA greatly improves the foaming ability of SDES solutions when the surfactant concentration is less than 0.1%, which is attributed to the fact that the polymer can enhance the stability of bubble films and reduce the bubble rupture rate during the foam generation process. The simulation results indicate that PVA can enhance the hydration of surfactant head groups and contribute to the formation of a three-dimensional hydrogen bond network between surfactants, polymers, and water molecules, thus greatly improving the stability of bubble liquid films. The above results suggest that water-soluble polymers can be used to improve the foaming ability of surfactant solutions by enhancing the bubble film stability, which is beneficial as it reduces the added concentration of foaming agents in aqueous foam applications.

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Formation mechanism and the extinguishment performance of gel-stabilized foam for inhibiting coal spontaneous combustion

Shi,

Long,

Sun

et al. 2024

Energy

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Investigation on the performance and application of a new design of foam generator used for fire extinguishment in underground coal mines

Cited by 7 publications

References 19 publications

Delineation and Prevention of the Spontaneous Combustion Dangerous Area of Coal in a Regenerated Roof: A Case Study in the Zhoujing Coal Mine, China

Delineation and Prevention of the Spontaneous Combustion Dangerous Area of Coal in a Regenerated Roof: A Case Study in the Zhoujing Coal Mine, China

Improvement of Foaming Ability of Surfactant Solutions by Water-Soluble Polymers: Experiment and Molecular Dynamics Simulation

Formation mechanism and the extinguishment performance of gel-stabilized foam for inhibiting coal spontaneous combustion

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