Flame propagation characteristics of mixed pulverized coal at the atmosphere of gasification

Wang, Xiaotong; Dai, Huaming; Liang, Guangqian; Zhu, Huiwei; Bing-qian, Zhang; He, Song; Zhao, Qi; Yin, Hepeng; Chen, Xianfeng

doi:10.1016/j.fuel.2021.120954

Cited by 19 publications

(3 citation statements)

References 29 publications

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“…In view of the industrial disaster, the explosion characteristics of gas/dust two-phase mixture should be researched indepth [6][7][8][9]. Further, the effective protective method can be taken to avoid derivative accidents and disasters [10][11][12][13].…”

Section: Inductionmentioning

confidence: 99%

Study on the Characteristics and Influence Factor of Methane and Coal Dust Gas/Solid Two-Phase Mixture Explosions

Wang,

Cao

et al. 2023

Fire

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This research aimed to the characteristics and influence factor of methane and coal dust gas/solid two-phase mixture explosions by experiment. Through comparative analysis of flame propagation characteristics, pressure, flame temperature and products, the characteristics of gas/solid explosions and its influence factor were analyzed. And the influence mechanism was also revealed. Results indicate that the coal dust parameter and methane concentration were the important influence factor on mixture explosions. Explosion intensity could be indirectly affected by influencing the flame propagation. Under the determined coal dust parameter, the explosion parameter showed a change trend of increase firstly and then decrease as the methane concentration increased. And it was the greatest at 6% methane concentration. However, the concentration of coal dust corresponding to the maximum pressure was variable and was decreased successively as the methane concentration increased. The corresponding dust concentrations were 500 g/m3 and 200 g/m3 under 2% and 10% methane concentrations, respectively. Meanwhile, the pressure all presented an increasing trend with the reduction of coal dust diameter under five coal dust concentrations, and the explosion intensity was the greatest at 300 g/m3 coal dust concentration. For 2% methane concentration, the explosion would not occur as the dust concentration was less than 400 g/m3. And the same phenomena also appeared as the methane concentration exceeded 10%. The explosion parameter presented the same change trend with the changes of methane concentration and coal dust parameters. Besides, the thermal stability and decomposition oxidation characteristics of burned coal dust were evidently changed compared with unburned coal dust. The weight loss rate and oxidation reaction rate were decreased, and the corresponding temperature was increased. It indicates that coal dust participated in gas/dust two-phase explosion reactions, and the pyrolysis reaction of volatile matter led to an obvious reduction in the weight loss and oxidation reaction rate. And the precipitation of volatile matter also resulted in an obvious pore structure on its surface. The physical parameters and internal components of coal dust were important factors affecting the reaction rates of gas/dust mixture explosions.

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Section: Inductionmentioning

confidence: 99%

Study on the Characteristics and Influence Factor of Methane and Coal Dust Gas/Solid Two-Phase Mixture Explosions

Wang,

Cao

et al. 2023

Fire

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“…Then, the combustion process spreads over the areas of the mixture adjacent to the ignition spot. It is typical for this stage (stage 2 in Figure 1) that the entire medium located next to the combustion zone is in motion; the motion is defined by W's visible flame propagation rate [14,15]. The visible flame propagation rate at this point can accelerate significantly, which leads to high excessive pressure values and follows the destruction of building structures.…”

Section: Introductionmentioning

confidence: 99%

Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Комаров

Korolchenko

Громов

et al. 2023

Fire

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Aspects of mathematical and physical modeling of deflagration explosions emerging during atmospheric (outdoor) accidental explosions are addressed. It has been demonstrated that when physically modeling accidental deflagration explosions, a stoichiometric mixture in the shape of a sphere or hemisphere supported by the ground should be used. This allows us to research the parameters of blast loads for the worst-case accidental scenarios or address the accident using the most conservative approach. A technique has been provided allowing one to create a mixture of a given blend composition in the shape of a sphere or hemisphere supported by the ground in outdoor conditions. It has been demonstrated that there is an ability to conduct modeling studies of accidental atmospheric explosions. We have provided examples of modeling studies of accidental atmospheric explosions; a methodology for analyzing experimental results has also been reviewed. The article discusses the mathematical modeling of outdoor (unobstructed) accidental deflagration explosions. It has been demonstrated that it is most reasonable to base computational experiments on linearized (acoustic) equations of continuum motion, as the visible flame propagation rate emerging during explosive combustion is small (compared to the speed of sound). There has been a satisfactory agreement between the numerical analysis and the experimental data.

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“…Moreover, the motion trajectory of coal dust particles and the mechanism of gas-induced coal dust combustion explosion have been further determined through experiments and numerical simulations. (Cheng et al, 2020;Sha et al, 2021;Wang X T et al, 2021). , Li et al (2022) discussed the diffusion characteristics of methane-coal dust in the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on gas and coal dust explosive overpressure and flame dynamic characteristics in an engineering-level test roadway

Niu,

Si,

et al. 2023

Front. Earth Sci.

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The continuous development of coal science and technology has made gas and coal dust explosion disasters an important factor that restricts efficient and intelligent coal mining, which seriously threatens the safe production process of coal mines. To explore the gas and coal dust explosive overpressure and flame propagation characteristics in an actual roadway, the dynamic characteristics of gas and coal dust mixed explosion propagation and evolution laws of explosion flames were investigated using an integrated explosion test system and a high-speed image acquisition system in an engineering-level test roadway with a length of about 700 m and a cross-sectional area of 7.2 m2. Experimental results showed that the peak overpressure measured at each measuring point during the propagation process of explosion shock wave in the roadway did not rise or fall monotonously but fluctuated. The power of explosion shock wave was significantly strengthened by adding coal dust, while the flame propagation speed sharply increased in a certain zone, which generally showed a first increasing and then declining trend. In addition, the flame was blue white after the gas in the roadway was ignited, developed in an irregular shape, and ignited the surrounding combustible gas soon, which further ignited the coal dust under the combined action of pressure wave and flame front. In this case, the flame was deep yellow on the whole. The gas and coal dust explosion flame propagated along the longitudinal section above the roadway, and the flame propagated at an accelerated speed on the transverse section due to the disturbance of obstacles. The study results will provide an important theoretical basis for the R&D of technical active explosion suppression equipment in coal mines and the improvement in their installation technologies.

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Flame propagation characteristics of mixed pulverized coal at the atmosphere of gasification

Cited by 19 publications

References 29 publications

Study on the Characteristics and Influence Factor of Methane and Coal Dust Gas/Solid Two-Phase Mixture Explosions

Study on the Characteristics and Influence Factor of Methane and Coal Dust Gas/Solid Two-Phase Mixture Explosions

Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Experimental study on gas and coal dust explosive overpressure and flame dynamic characteristics in an engineering-level test roadway

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