CSTR系统中甲烷燃烧过程的分岔特性分析

Bifurcation Characteristics Analysis of Methane Combustion Process in CSTR

运用分岔理论对连续流动均匀搅拌反应器(CSTR)中甲烷燃烧过程的分岔特性进行了详细分析,采用了甲烷的详细化学反应机理.分别以系统温度、滞留时间为分岔参数,详细讨论了CSTR系统的各种工况(系统压力、混合气过量空气系数、系统温度及滞留时间)对甲烷燃烧过程分岔特性的影响.结果表明,在甲烷的整个燃烧过程中,出现了双着火点,即部分着火点和完全着火点;同时,出现了3个阶段,即部分着火阶段、完全着火阶段和熄火阶段.当以系统温度为分岔参数时,随着系统压力的升高、滞留时间的延长、过量空气系数的增加,甲烷的完全着火温度也随之降低.当以滞留时间为分岔参数时,随着系统温度、系统压力的升高,甲烷发生完全着火所需要的滞留时间随之缩短;过量空气系数对甲烷发生着火所需要的滞留时间影响较小.

Bifurcation characteristics analysis of the combustion process of methane in a continuously-flow well-stirred tank reactor（CSTR）was carried out.The detailed chemical reaction mechanism of methane was adopted.The effects of system pressure,excessive air coefficient,system temperature and residence time on the bifurcation characteristics of the combustion process were discussed with system temperature and residence time as bifurcation parameters,respectively.There are two ignition points,namely partial ignition point and full ignition point,and three stages,including ignited branch,full ignited branch and extinguished branch,in the whole combustion process.When system temperature is adopted as bifurcation parameter,with the increase of system pressure,residence timegets prolonged,excessive air coefficient increasing,full ignition temperature decreases.When residence time is adopted as bifurcation parameter,with the increase of system pressure and temperature,residence time of full ignition is shortened.However,excessive air coefficient has little effect on residence time.