Investigation on propagation mechanism of large scale mine gas explosions

Wang, Cheng; Zhao, Yongyao; Addai, Emmanuel Kwasi

doi:10.1016/j.jlp.2017.07.011

Cited by 38 publications

(14 citation statements)

References 10 publications

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“…The three basic elements of a gas explosion accident are gas, ignition source, and sufficient oxygen. The generation of the fire source is controllable, and the causes are almost all related to human activities [19,20]. Simultaneously, some studies have proved that the proportion of human factors causing gas explosion accidents is about 97% [21].…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment of Miners’ Unsafe Behaviors: A Case Study of Gas Explosion Accidents in Coal Mine, China

Tong

Yang

et al. 2019

IJERPH

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China’s coal mine production situation is grim and various types of accidents occur frequently, and gas explosion accidents are the highest incidence of coal mine accidents. The authors selected 200 gas explosion accidents of coal mine enterprises in recent years, and extracted a large number of workers’ unsafe behaviors. Meanwhile, four working types related to gas explosion accidents were obtained, namely ventilation, gas prevention and fire extinguishing, blasting, and electrician. This article listed some influencing factors of unsafe behaviors and corrected the probability of unsafe behaviors. In addition, a probabilistic risk assessment model was established, and the Monte Carlo method was used to analyze the risks caused by unsafe behaviors of various working types. The results show that the risk of unsafe behaviors caused by the ventilation working type is the highest, followed by gas prevention and fire extinguishing, and finally blasting and electrician. This paper studies the influencing factors of miners’ unsafe behaviors from the perspective of behavior, guarantees effectively the safety management of coal mine enterprises, and lays a foundation for studying unsafe behaviors related to coal mine gas explosions.

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Section: Introductionmentioning

confidence: 99%

Risk Assessment of Miners’ Unsafe Behaviors: A Case Study of Gas Explosion Accidents in Coal Mine, China

Tong

Yang

et al. 2019

IJERPH

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“…Ma et al presented the explosion characteristics of a mixture of methane, hydrogen, and air [19][20][21]. Wang et al used large eddy simulation to investigate the propagation characteristics of explosion waves in coal mine [22]. Unsteady premixed flame propagation around obstacles was analyzed by large eddy simulation, and it is found that the obstacles have important effects on unsteady flame propagation during the explosion process [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Characteristics of Gas Explosion Process in Natural Gas Compartment of Utility Tunnel Using FLACS

et al. 2019

Sustainability

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With the rapid urbanization in China, directly buried municipal pipelines have been gradually replaced by urban utility tunnels due to a serious shortage of urban underground spaces and weak disaster prevention of traditional municipal pipelines. The urban utility tunnels normally contain electricity pipelines, natural gas pipelines, heat pipelines, sewer pipelines, etc. If a natural gas pipeline leaks, a fire and explosion might occur and lead to serious consequences. In this study, the characteristics of gas explosion in a natural gas compartment of urban utility tunnel are investigated based on FLACS (Flame Acceleration Simulator) simulations. The results revealed that the flame profile undergoes two unstable flame stages. When the ignition position is set at the middle area (100.25, 1.2, 1.4 m) of the 200 m-long natural gas compartment, the maximum overpressure of the gas explosion in the 200 m-long natural gas compartment is 25.17 bar, which is the largest maximum overpressure under all gas explosion simulation setups. It is also found that the length of the natural gas compartment and different ignition positions have slight effects on the maximum overpressure. This study could provide technical support for structural strength design and division of the fireproofing area of the natural gas compartment in the utility tunnel, which is of great significance to improve urban safety during sustainable development.

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“…e determination coefficients of equations ( 9) and (10) are 0.9865 and 0.9547, respectively. From equation (10), it can be concluded that the maximum pressure p Lmax is 19.75 × (r 0 ) 0.84 at r � r 0 . At r 0 � 10, 20, 30, 40, and 50 m, they are 138.52, 250.37, 341.83, 438.51, and 525.21 kPa, respectively, as depicted in Figure 3.…”

Section: Blast Wave Space Distributionmentioning

confidence: 99%

“…With the aid of the software FLACS, Zhu et al [9] simulated the explosion process of the methane/air mixture in the direct full-scale tunnel and examined the pressure and its influencing factors, such as the methane gas volume concentration, tunnel blockage ratio, tunnel length, and tunnel cross section. With the application of the large eddy simulation method, Wang et al [10] investigated the gas explosion shock wave propagation mechanism in the coal mine in consideration of the disaster-causing factors. Combining with the complicated structure characteristics of the goaf, Ke et al [11] discussed the gas explosion shock wave and flame propagation mechanism in the goaf by using the open-source software OpenFOAM.…”

Section: Introductionmentioning

confidence: 99%

The Study on the Shock Wave Propagation Rule of a Gas Explosion in a Gas Compartment

Lin

Hou

Derlatka

et al. 2022

Shock and Vibration

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Combined with the k-ε turbulence model of general application, a refined finite element model of a utility tunnel’s gas compartment filled with the methane/air mixture is developed. A series of analyses are made by using the powerful industry-leading computational fluid dynamics (CFD) software flame acceleration simulator (FLACS) to study the shock wave propagation rule in the gas compartment. The longitudinal and transversal distribution laws of the explosion shock wave are gained taking into consideration the spatial characteristics of the gas compartment. The influences of a few parameters, such as initial conditions and section size of the gas compartment, on the shock wave propagation rule are further discussed. The basic procedure for predicting the peak pressure of the blast wave is provided by considering the initial conditions and the gas compartment, and the corresponding injury effect of the explosion wave on the living beings is assessed. The investigation demonstrates that the peak pressure by the coupled effect between the initial conditions is significantly influenced, especially at the upper and lower gas explosion limits. The peak pressure increases gradually as the width or height increases, and both basically meet the linear relation. The proposed method can forecast the peak pressure of the explosion shock wave in the gas compartment accurately. According to the peak pressure longitudinal and transversal distributions of the blast wave, the peak pressure is far greater than the killing pressure threshold in the underground and closed space; consequently, it is not safe for the living beings in the gas compartment.

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Investigation on propagation mechanism of large scale mine gas explosions

Cited by 38 publications

References 10 publications

Risk Assessment of Miners’ Unsafe Behaviors: A Case Study of Gas Explosion Accidents in Coal Mine, China

Risk Assessment of Miners’ Unsafe Behaviors: A Case Study of Gas Explosion Accidents in Coal Mine, China

Numerical Analysis of the Characteristics of Gas Explosion Process in Natural Gas Compartment of Utility Tunnel Using FLACS

The Study on the Shock Wave Propagation Rule of a Gas Explosion in a Gas Compartment

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