基于埃特金插值的蒸气云爆炸规律研究

Study of Explosion Law of Vapor Cloud Based on Etkin Interpolation

石油化工企业生产过程中,当含有CO或者H2等易燃易爆气体泄漏到空气中,在自由空间与空气混合形成爆炸性混合气体,一旦出现点火源就会发生无约束的蒸气云爆炸。爆炸发生后将导致体系温度和压力急剧升高,给石油化工装置造成严重的破坏,给企业造成重大的经济损失,甚至出现人员伤亡。为了有效避免蒸气云爆炸事故的发生,文章以CO、H2为例,基于气体爆炸热力学原理和埃特金插值法,采用软件模拟了蒸气云爆炸的温度峰值和压力峰值随可燃气体浓度的变化规律。研究结果表明:CO、H2蒸气云爆炸的温度峰值和压力峰值随体积分数的增大呈现先增大后减小的变化规律,与体积分数近似为三次函数关系,企业可参照选用相应等级的抗高温和抗高压装置设备以保障化工企业的整体安全性。

In the production process of petrochemical enterprises,when the flammable and explosive gas containing CO or H2 leaks into the air,it will mix with the air in the free space to form an explosive gas mixture,and once the ignition source appears,there will be an unrestricted vapor cloud explosion.After the explosion,the temperature and pressure of the system will rise sharply,which will cause serious damage to the petrochemical plant,economic losses to the enterprise,and even casualties.In order to effectively avoid the occurrence of vapor cloud explosion accidents,based on thermodynamics and Etkin interpolation,the MATLAB software is used for numerical simulation,and the change rules of temperature peak and pressure peak of vapor cloud explosion are studied with CO and H2 as examples.The results show that the temperature peak and pressure peak of CO and H2 vapor cloud explosion increase first and then decrease with the increase of volume fraction,which is approximately a cubic function relationship with volume fraction.The enterprises can select the corresponding level of high-temperature and high-pressure resistant equipment to ensure the overall safety of chemical plants.