【摘要】 为评估炼钢厂中突发煤气泄漏的后果,通过建立二维简化平面模型,采用LES湍流模型对煤气在厂区的泄露扩散过程进行了数值模拟,得到了CO浓度随时空的分布规律。计算结果表明,在泄露过程中,泄漏口近的CO浓度分布比较集中;泄漏停止后,在自然风的作用下CO浓度并不能很快降低,而是呈现一个平缓的发展过程。本结果对突发煤气泄漏的报警和预案的制定有一定参考价值。更多还原

【Abstract】 The coal gas sudden leakage from the storage tank to air can be disastrous.The diffusion law of coal gas(as light gas) must be carefully studied to prevent the damaging consequence to the workers.This paper presents a simulation of the leakage and diffusing process of coal gas using a simplified two-dimensional plane model combined with LES turbulence model, from which the law of CO concentration versus time and space is obtained.The simulation results show that(1) at the initial stage, the CO concentration near the mouth of leak is more concentrated during disclosure process;(2) when the leak is stopped, the concentration of CO is not immediately reduced and it is followed by a gentle process of development, due to bulky tanks up the wind, which induce the wind turbulence.With the leakage, its leaked CO around the mouth of pressure and velocity disturbance, a disturbance will spread.In the horizontal direction of leakage mouth upward, the COconcentration is significantly higher than that in windward direction.In the natural and ventilated conditions, when leakage stops, the concentrations of CO are not quickly reduced, but take a gentle development process.The results of the study may help to establish the emergency gas leak alarm and preventive measures.更多还原