基于CHEMKIN的可燃气体爆炸下限模拟研究

发布时间：2018-07-28 10:17

【摘要】：基于CHEMKIN软件的绝热燃烧相平衡模型,模拟甲烷、乙烷、丙烷在绝热状态下的燃烧实验,分别获得相应条件下的绝热温升和绝热压升。随着可燃气体体积分数的增加,绝热温升和绝热压升均呈现先上升后下降的趋势。将绝热压升为0.32MPa时对应的可燃气体浓度作为该体系的爆炸下限值,通过计算获得三种气体的爆炸下限值,并与文献值进行对比,吻合程度较好。利用该模型对含氮混合气体的燃烧过程进行模拟,分析惰性介质氮气对爆炸反应的抑制机理,并利用压力判断准则计算混合气体的爆炸下限值。预测值与文献值的最大绝对误差为0.54%,平均绝对误差为0.274%。结果表明所建立的绝热燃烧相平衡模型能够准确地预测单一体系和含氮混合体系等可燃气体的爆炸下限。
[Abstract]:Based on the adiabatic combustion phase equilibrium model of CHEMKIN software, the combustion experiments of methane, ethane and propane in adiabatic state were simulated, and the adiabatic temperature rise and adiabatic pressure rise were obtained under the corresponding conditions, respectively. With the increase of volume fraction of combustible gas, both adiabatic temperature rise and adiabatic pressure rise tend to rise first and then decrease. When the adiabatic pressure is raised to 0.32MPa, the combustible gas concentration corresponding to the system is taken as the explosion lower limit. The explosion lower limit values of three gases are obtained by calculation, and the results are compared with those of the literature, and the results are in good agreement. This model is used to simulate the combustion process of nitrogen-containing mixture gas, and the mechanism of inert medium nitrogen to suppress the explosion reaction is analyzed, and the lower limit of explosion of the mixture gas is calculated by using the criterion of pressure judgment. The maximum absolute error between the predicted value and the reference value is 0.54 and the average absolute error is 0.274. The results show that the adiabatic combustion phase equilibrium model can accurately predict the explosion lower limit of combustible gases such as single system and nitrogen-containing mixture system.
【作者单位】：济南城建集团有限公司;南京工业大学安全科学与工程学院;河北工程技术学院土木工程学院;
【分类号】：O38

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