基于CHEMKIN-PRO的多元混合气体瓦斯燃烧模拟研究

针对多种不同性质气体对瓦斯燃烧过程的影响问题,采用CHEMKIN-PRO软件,构建USC Mech 2.0动力学模型对不同组分C_2H_4/CO_2瓦斯混合气体燃烧过程进行了深入研究,模拟分析了不同组分C_2H_4/CO_2瓦斯层流燃烧速率及H,O自由基体积分数的变化趋势,并利用SENKIN程序对其进行了敏感性分析。计算结果表明:随着CO_2体积分数的增大,层流燃烧速率降低,在φ1和φ1.25时分别降低了约13 cm/s和149 cm/s,H,O自由基体积分数降低,其协同抑制瓦斯燃烧;随着C_2H_4体积分数的增大,层流燃烧速率略微增加,在φ1和φ1.4时分别升高了约3和46 cm/s,H,O自由基体积分数升高,其协同促进瓦斯燃烧;在φ≤1条件下,随着当量比的增加,促进CH_4生成的关键反应步的敏感性系数升高幅度较大,其抑制瓦斯燃烧。

Computing study on multivariate mixed gas burning by CHEMKIN-PRO software

In order to solve the influence of gases with multiple different natures on the methane burning process,using the CHEMKIN-PRO software,a USC Mech 2.0 dynamic model was built to further study the combustion process of gas mixture consisting of different components’ C2H4/CO2.Then the change tendency of laminar burning velocity and H and O free radical’s volume fraction were simulated and analyzed under different components.The program SENKIN was used to analyze the sensitivity.The calculated results showed that the laminar burning velocities of methane decreased with the increase of the volume fraction of CO2,and they decreased 13 cm/s,149 cm/s respectively under different conditions of φ<1 or φ>1.25.H and O volume fractions reduced and their synergistic effect was to inhibit the gas burning.The laminar burning velocities of methane increased slightly with the increase of the volume fraction of C2H4,and they increased 3 cm/s and 46 cm/s respectively under different conditions of φ<1 or φ>1.4.H and O free radical’s volume fractions increased correspondently and their synergistic effect was to promote the gas burning.With the equivalence ratio increased,the reduction about the sensitivity coefficient of key step reaction on the promotion of CH4 generated was larger under the condition of φ≤1,so it inhibited gas burning.