Influence of ignition delay on explosion severities of the methane–coal particle hybrid mixture at elevated injection pressures

Li, Haitao; Deng, Jun; Chen, Xiaokun; Shu, Chi‐Min; Kuo, Chia-Ho; Hu, Xiangyu

doi:10.1016/j.powtec.2020.04.034

Cited by 30 publications

(12 citation statements)

References 75 publications

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“…From Figure , the maximum explosion pressure ( P m ) values for 10 and 20 μm aluminum dusts were 0.64 and 0.52 MPa, respectively, while the maximum pressure rise rates ((d P /d t ) m ) were 53.15 and 15.96 MPa/s. In each trial, the combustion time ( t c ) was defined as the time from the point of ignition to the point at which P m was obtained, , and the combustion times for the 10 and 20 μm specimens were 37 and 67 ms, respectively. The deflagration index ( K st ) for each trial was calculated as − where (d P /d t ) m is the maximum rate of pressure rise (MPa/s) and V is the volume of the test vessel (m 3 , V = 0.02 m 3 in the present work).…”

Section: Results and Discussionmentioning

confidence: 99%

Investigation on the Inhibition of Aluminum Dust Explosion by Sodium Bicarbonate and Its Solid Product Sodium Carbonate

Chen

Xiao

et al. 2021

ACS Omega

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To characterize the inhibiting effects of sodium bicarbonate (NaHCO 3 ) on aluminum dust, the inhibiting capacities of NaHCO 3 and its solid product sodium carbonate (Na 2 CO 3 ) on the explosions of 10 and 20 μm aluminum dusts were studied using a standard 20 L spherical chamber. Explosion parameters were analyzed based on the induction period and explosion stage to evaluate the inhibiting effects. The results show that the induction period of 10 μm aluminum dust explosion is 18.2 ms, which is shorter than that of 20 μm aluminum dust. Two aluminum dust explosions can be completely inhibited during the induction period when inert ratios of NaHCO 3 are 350 and 150%, respectively, but that is not observed after adding the corresponding amount of Na 2 CO 3 . When the inert ratio ranges from 0 to 150%, the physical effect of NaHCO 3 on 10 μm aluminum is poor and the chemical effect is the essential process. But as the inert ratio increased from 200% to 350%, the physical effect of NaHCO 3 is higher than the chemical effect, suggesting that the physical effect is the key factor. With the increase of NaHCO 3 , the physical effect increases gradually. However, the chemical effect changes little. The physical effects of NaHCO 3 including heat absorption and isolation play an essential role in the inhibiting process, which has a significant impact on the pyrolysis process and explosion parameters. The results of the present work provide guidance for the prevention and control of aluminum dust explosions.

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Section: Results and Discussionmentioning

confidence: 99%

Investigation on the Inhibition of Aluminum Dust Explosion by Sodium Bicarbonate and Its Solid Product Sodium Carbonate

Chen

Xiao

et al. 2021

ACS Omega

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“…The CFD simulations of the gas phase followed the mass, kinetic, and energy conservations laws [21,26]. The mass conservation of the gas phase can be given as…”

Section: Control Equation and Numerical Methods 241 Gas-phase Modelmentioning

confidence: 99%

“…Further increases in grid numbers resulte in the simulation results. The CFD simulations of the gas phase followed the mass, kin vations laws [21,26]. The mass conservation of the gas phase can…”

Section: Meshingmentioning

confidence: 99%

“…Li et al investigated the influence of different levels of injection pressure on the dispersion of methane/coal mixtures in a 20 L apparatus through CFD simulations. The results showed that a higher injection pressure led to a better fluid dispersion, resulting in the coal dust particles reaching their best dispersion state in a short time [21]. Both and Portarapillo (2020) used an Euler-Lagrange method to individually investigate the dust explosion characteristics of cornstarch and niacin.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Magnesium Dust Dispersion and Explosion in 20 L Apparatus via an Euler–Lagrange Method

Tsai

Zhou

2022

Energies

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Computational fluid dynamics (CFD) was used to investigate the explosion characteristics of a Mg/air mixture in a 20 L apparatus via an Euler–Lagrange method. Various fluid properties, namely pressure field, velocity field, turbulence intensity, and the degree of particle dispersion, were obtained and analyzed. The simulation results suggested that the best delayed ignition time was 60 ms after dust dispersion, which was consistent with the optimum delayed ignition time adopted by experimental apparatus. These results indicate that the simulated Mg particles were evenly diffused in the 20 L apparatus under the effect of the turbulence. The simulations also reveal that the pressure development in the explosion system can be divided into the pressure rising stage, the maximum pressure stage, and pressure attenuation stage. The relative error of the maximum explosion pressure between the simulation and the experiments is approximately 1.04%. The explosion model provides reliable and useful information for investigating Mg explosions.

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“…Physical model tests are widely used in underground coal mining, tunnel engineering and other underground engineering fields [32][33][34][35][36][37][38]. The main factors that affect the physical and mechanical properties of similar materials are the selection of raw materials (aggregate, cementitious material), proportion, density, moisture content, etc [39][40][41][42][43][44]. However, the research focus is on the selection of raw materials and their proportion, while there are few studies on the effect of the moisture content on the mechanical properties of similar materials [45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Experimental development process of similar material of water resisting layer in physical model test

et al. 2021

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The stability evaluation of water resisting layer in the process of coal mining is the key to study the law of water and soil loss and prevent the loss of water resources. The development and proportioning of similar materials are the basis to study the stability of water resisting layer by physical simulation. A new type of similar material considering water characteristics was developed through orthogonal experiments. The similar material was composed of river sand, bentonite, silicone oil, vaseline, and water. Determine the best test development process. First of all, the proportion test scheme is designed based on the orthogonal test. Then, the influence of cement concentration, mass ratio of silicone oil to vaseline and other components on the density, uniaxial compressive strength, elastic model and Poisson’s ratio of similar materials was analyzed by range analysis. Finally, the multiple linear regression equation between the parameters and the composition of similar materials for water resisting layer is obtained, and the optimal composition ratio is further determined according to the relationship between the test influencing factors and the mechanical properties of similar materials. The results show that the selected raw materials and their proportioning method are feasible. The content of river sand plays a major role in controlling the density and Poisson’s ratio of similar materials. The mass ratio of aggregate to binder is the main factor affecting the uniaxial compressive strength and elastic modulus of similar materials, while the cementing concentration has the second largest influence on the density, uniaxial compressive strength, elastic modulus and Poisson’s ratio of similar materials. Determining the cementing concentration that matches the design of similar material model tests is critical to improving test accuracy and provides a reference for the preparation of similar materials for water resisting layer under different requirements during the development of similar materials.

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Influence of ignition delay on explosion severities of the methane–coal particle hybrid mixture at elevated injection pressures

Cited by 30 publications

References 75 publications

Investigation on the Inhibition of Aluminum Dust Explosion by Sodium Bicarbonate and Its Solid Product Sodium Carbonate

Investigation on the Inhibition of Aluminum Dust Explosion by Sodium Bicarbonate and Its Solid Product Sodium Carbonate

Numerical Simulation of Magnesium Dust Dispersion and Explosion in 20 L Apparatus via an Euler–Lagrange Method

Experimental development process of similar material of water resisting layer in physical model test

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