The Characteristics of Methane Combustion Suppression by Water Mist and Its Engineering Applications

Pan, Rongkun; Xiao, Zejun; Yu, Minggao

doi:10.3390/en10101566

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…The effects of underground tremors may also be visible on the surface in the form of shocks felt by people, cracks in buildings, roads, etc. The threat from gases, such as methane, acetylene, and coal dust, in the form of their increased concentrations in the air can be efficiently monitored by using specialized instruments [2][3][4]. As a result, accidents related to gas explosions are reported to be decreasing [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Autonomous Instrumentation for Measuring Electromagnetic Radiation from Rocks in Mine Conditions—A Functional Analysis

Maniak

Mydlikowski

2022

Sensors

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This paper analyses the function of an innovative integrated receiver for the measurement of electromagnetic field emissions. The autonomous receiver measures and registers the elevated emission levels of both components of the EM field originating from rocks subjected to increased mechanical stress. The receiver’s sensitivity of 60 µV/m, its dynamic range of 98 dB, and its impulse response of 0.23 V/µs were determined in laboratory conditions. Real EM field signals from hard coal samples subjected to crushing force were recorded using an autonomous receiver. The observed and recorded results confirm that the receiver operates in the full range of amplitudes of the EM field signal emitted from the rock. The results determine the band of characteristic signals for EM field emission from hard coal. The system created on the basis of autonomous EM receivers can support the existing seismic safety systems in real mine conditions by predicting the possibility of mine collapse hazards.

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Section: Introductionmentioning

confidence: 99%

Autonomous Instrumentation for Measuring Electromagnetic Radiation from Rocks in Mine Conditions—A Functional Analysis

Maniak

Mydlikowski

2022

Sensors

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“…In recent years, researchers have made some progress in the technologies and materials for suppressing gas explosion. Chemical powders, aerosol, water mist and inert gases [1][2][3][4][5][6] were used for preventing the gas explosion. Due to the outstanding suppression effect, chemical powders have become a new research focus in the field of gas explosion suppression.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pristine Palygorskite Powders on Explosion Characteristics of Methane-Air Premixed Gas

et al. 2018

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In this study, pristine palygorskite powders were used as the inhibition materials to suppress the explosion of methane-air premixed gas for the first time. The composition, porosity and pyrolysis characteristics of the powders were tested by X-ray diffraction (XRD), energy dispersive spectrometry (EDS), N 2 adsorption-desorption and Thermogravimetry-differential scanning calorimetry (TG-DSC) techniques. The effects of pristine palygorskite powders concentration on the explosion pressure and the average velocity of flame propagation of the 9.5% methane-air premixed gas were tested by a 20 L spherical explosion system and a 5 L pipeline explosion system. The results indicated the pristine palygorskite powders possess a considerable suppression property on methane explosion. When the mass concentration of pristine palygorskite powders was 0.20 g·L −1 , the max-pressure of methane explosion was decreased by 23.9%. The methane explosion flame propagation velocity was inhibited obviously. Owing to the excellent inhibitory performance and the advantage of low-cost and environmental harmlessness, pristine palygorskite powders are potential new materials for the application on gas explosion suppression.Palygorskite clay is a kind of magnesian-aluminum silicate mineral with chain-layer structure [18][19][20]. China is the largest palygorskite clay origin country in the world. The typical Molecular formula of palygorskite is Mg 5 Si 8 O 20 (OH) 2 (H 2 O)·4H 2 O [21], which contains different metal ions related to different origins place, such as Al 3+ , Fe 3+ , Fe 2+ , etc. In recent years, palygorskite clay has been widely used in industrial fields such as petrochemical industry, environmental protection, food industry, ceramics, insulation materials and plastics [22,23]. In view of its structure, composition and high surface area, palygorskite clay may be feasible for application in the field of gas explosion suppression. However, to the best of our knowledge, there is still no research about the application of palygorskite clay in gas explosion suppression.Herein, pristine palygorskite powders were used as methane explosion suppression material for the first time. Pristine palygorskite powders were characterized by the techniques of XRD, EDS, N 2 adsorption-desorption and TG-DSC. The suppression properties of the pristine palygorskite powders for 9.5% methane-air premixed gas were tested in a 20 L spherical explosion vessel and a 5 L pipeline experimental system. Based on the sample characterization results and explosion parameters, the suppression mechanism of the pristine palygorskite powders on the gas explosion was further explored. Materials and Methods MaterialsPristine palygorskite powders, which are gray in color, were obtained from Xuyi, Jiangsu province, China. The samples were dried in a vacuum oven at 50 • C for 2 h, and further ground by an agate mortar. Finally, the pristine palygorskite powders for test were collected through a 200 mesh sieve screen. CharacterizationX-ray diffraction (XRD) analysis was ca...

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“…The economy of China has developed rapidly and the demand for coal is increasing the intensity of coal mining [1]. This can lead to accidents during coal mining.…”

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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The Characteristics of Methane Combustion Suppression by Water Mist and Its Engineering Applications

Cited by 9 publications

References 19 publications

Autonomous Instrumentation for Measuring Electromagnetic Radiation from Rocks in Mine Conditions—A Functional Analysis

Autonomous Instrumentation for Measuring Electromagnetic Radiation from Rocks in Mine Conditions—A Functional Analysis

Effect of Pristine Palygorskite Powders on Explosion Characteristics of Methane-Air Premixed Gas

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

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