Abstract
Gas explosion seriously threatens the employees security and restricts the safe production of coal mines. Therefore, it is particularly essential to investigate the prevention and control of gas explosions. In this study, a two-dimensional numerical model of a spherical explosion tank was developed to explore the effects of water vapor on gas explosions in a high-pressure environment. Explosion parameters of 10% gas, 1 MPa pressure, and water vapor contents varying from 0% to 8% were simulated using FLUENT software. The results show that the maximum explosion pressure and temperature of the premixed gas gradually decrease with increasing water vapor content, i.e., when the water vapor content is increased from 0% to 8%, the maximum explosion pressure and temperature of the gas mixture decreases from 2.52 MPa and 2092 K under dry conditions to 1.62 MPa and 1714 K with 8% water vapor. The attenuation amplitude is also reduced upon the addition of steam. Water vapor in premixed gas therefore plays a vital role in suppressing gas explosions.
Highlights
Gas explosions have always been the number one threat to safety in coal mines and other industries, especially in high-temperature and high-pressure environments where the hazards and potential damage of gas explosion are more serious (Li et al 2018)
This study investigated the effect of water vapor content on gas explosions
The increase of inert water vapor content increases the stoichiometric ratio of the fuel and oxidant, while the water vapor content of the premixed gas in the simulation remains unsaturated
Summary
Gas explosions have always been the number one threat to safety in coal mines and other industries, especially in high-temperature and high-pressure environments where the hazards and potential damage of gas explosion are more serious (Li et al 2018). An underground gas explosion instantaneously generates high temperatures and pressures and, under certain conditions, the environment is likely to experience secondary or even multiple explosions, which are influenced by the high-temperature and high-pressure steam generated by the primary explosion. These issues are addressed in the study of explosion propagation law and gas explosion characteristics. Jia et al (2013) established a mathematical model of the gas explosion reaction in a confined space to investigate the damping effect of the chemical reaction kinetics of carbon monoxide and water vapor They found that damped gas explosions with water vapor are superior to those of carbon monoxide. The results are used to quantitatively explore the inhibition effects of water vapor content on gas explosions
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