基于详细化学动力学的甲烷热着火影响因素分析

Analysis on influencing factors of methane thermal ignition based on detailed chemical kinetics

利用化学动力学软件CHEMKIN4.1,在不同初始温度、浓度、湿度和压强下,对甲烷热着火进行了详细化学动力学模拟。通过对主要组分摩尔浓度分析和温度敏感性分析,得到了甲烷热着火过程的主要基元反应和引发热着火发生的主要原因。通过对甲烷热着火的延迟时间、热着火发生后主要生成物摩尔浓度和反应后的温度的对比分析,揭示了初始浓度、湿度和压强对甲烷热着火的影响规律。本研究可以为甲烷为主的气体如瓦斯、天然气等可燃气体的燃烧和爆炸提供理论支撑,从而有效利用这些可燃气体,降低灾害的发生。

Under the conditions of different initial temperature,concentration,humidity and pressure,the detailed chemical reactions of methane thermal ignition were simulated by the chemical kinetic software CHEMKIN4. 1. Through the analysis on molar concentration of main components and temperature sensitivity,the main elementary reactions of methane thermal ignition process and the main causes initiating thermal ignition were derived. Based on the comparative analysis on delay time of methane thermal ignition,the molar concentration of main resultants after thermal ignition and the temperature after reaction,the influence laws of initial concentration,humidity and pressure on methane thermal ignition were revealed. The research provides the theoretical support for the combustion and explosion of flammable gas dominated by methane,such as gas and natural gas,so as to utilize the combustible gas effectively and reduce the occurrence of accidents.