Flow characteristic investigation of inhibition foam used for fire extinguishment in the underground goaf

Lu, Xinxiao; Zhu, Huangqiu; Wang, Biao; Hu, Chao; Zhao, Hongjin; Huo, Yujia

doi:10.1016/j.psep.2018.02.005

Cited by 41 publications

(18 citation statements)

References 22 publications

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“…Additionally, large amounts of dust are generated when cutting coal and rock, which can trigger coal dust explosions and pneumoconiosis [18][19][20][21]. In order to create a safe working environment for coal miners, aqueous foam has been proven to be very effective for extinguishing fires and suppressing dust; these products are known as foam extinguishing technology and foam dust suppression technology [22][23][24][25][26]. In field applications, foam is produced by injecting compressed air into foaming agent solutions [27].…”

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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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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“…In the process of mining, various calamity accidents often occur. Especially mine fires are complex, lasting and costly catastrophic accidents worldwide [1]. Because of being in the confined space, the high-temperature smoke generated by the fire is difficult to dissipate quickly, and gradually fill the whole underground space.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Influence of Altitude on Roof Temperature in Mine Fires

Huang

et al. 2020

IEEE Access

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The temperature distribution of the roadway roof in a mine fire is closely related to the internal environment of the mine, which changes by the mine's altitude. In order to accurately reveal the distribution of roof temperature in mine fires at different elevations, altitude should be considered as avariable. Using FDS (Fire Dynamic Simulator), six fire sources of different scales are designed to simulate fire scenarios at five different altitudes from 0 to 4,000 m (equal diversion point). The roof temperature distribution along the longitudinal centerline of the tunnel is obtained. At the same time, the influence of high temperature on the roof support of the roadway is analyzed when the mine's altitude changes. The results show that when the fire heat release rate is relatively small, the combustion belongs to fuelcontrolled combustion, and the roof temperature rises with altitude. As the heat release rate continues to increase, the roof temperature decreases with increasing altitude, which is mainly due to the low-oxygen environment in plateau areas. In addition, mine fires at normal altitudes (altitude < 3,000 m) are less affected by altitude changes, and the roof temperature is always positively related to fire heat release rate. However, high altitude has an inhibitory effect on fire. In the initial stage of continuously expanding the heat release rate, There is still a positive correlation between the roof temperature and the heat release rate. When the heat release rate increases to 100 MW, the roof temperature distribution does not continue to increase. Instead, it remains stable, and the higher the altitude, the lower the stable value. Finally, based on the combination of dimensional analysis and dimensionless analysis, a correlation for predicting the longitudinal distribution of roof temperature in mine fires at different altitudes is established. The predicted data of this empirical model is highly consistent with the measured data.

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“…They are both useful and cheap for CSC inhibition. Lu et al 9 used inhibition foam for fire extinguishment in the underground goaf. Nevertheless, while these inorganic salts can well inhibit CSC by covering coal surface, their inhibitory effects weaken with the evaporation of water because they are mixed with distilled water for the inhibition.…”

Section: Introductionmentioning

confidence: 99%

Effects of ionic liquid concentration on coal low‐temperature oxidation

Cui

Jiang

Zheng

et al. 2019

Energy Science & Engineering

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In order to find out the optimal concentration of ionic liquid to lower the cost of inhibiting coal spontaneous combustion, effects of aliphatic hydrocarbons, hydrogen bonds, and some structural parameters of coal samples treated with low‐concentration ionic liquids were analyzed through Fourier‐transform infrared spectroscopy (FTIR) and temperature‐programmed experiments. Meanwhile, the changes of index gases in the heating process were observed by the temperature‐programmed method. The results show that the contents of aliphatic hydrocarbons in the treated coal samples decrease remarkably, so does the length of aliphatic chain CH2/CH3; besides, the amount of CO produced also decreases to some extent. When the mass concentration ratio is 1:10, HB‐tc, BB‐tc, AC‐tc, and BN‐tc can reduce the spatial structure and enhance the structural stability of aromatic clusters in coal. The CO concentrations of 1:2 HB‐tc and 1:10 AC‐tc are obviously lower than that of raw coal, indicating their better inhibitory effects. The inhibitory effect of HB‐tc decreases with the decrease in concentration. With the rise of temperature, the effect of concentration on the inhibition of CO production gradually weakens at 180°C and 200°C. AC‐tc achieves the optimum inhibitory effect near 1:10 mass concentration ratio.

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Flow characteristic investigation of inhibition foam used for fire extinguishment in the underground goaf

Cited by 41 publications

References 22 publications

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

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

Numerical Study on the Influence of Altitude on Roof Temperature in Mine Fires

Effects of ionic liquid concentration on coal low‐temperature oxidation

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