摘要
对生物质气在高温空气燃烧模式下的着火过程进行了研究.利用CHEMKIN程序的封闭均相反应器模型和GRI-Mech3.0详细反应机理,分析了氧气浓度对生物质气着火过程的影响,并进行了敏感性分析.反应机理的可行性验证表明,可以将GRI-Mech3.0机理用于生物质气的着火过程研究.研究表明,随着氧气浓度减小,生物质气着火延迟时间迅速增加,温度对时间的导数减小,燃烧前后的比容变化减小,燃烧产物中可燃成分含量减小.敏感性分析表明,生物质气中H2成分的相关反应在生物质气着火过程中占据重要地位.特别地,氧气浓度越低,反应H+O2幑幐OH+O在生物质气着火过程中的支配地位越强.
The goal of this paper Was to identify the dominant factors in the start of combustion of biogases in the mode Of HiTAC （high temperature air combustion）. The ignition process was investigated through a closed homogeneous reactor model of CHEMKIN4.0 code, and a sensitivity analysis was conducted at the same time. It is feasible to adopt detailed mechanisms, i. e. GRI-Mech3.0, for the ignition of biogases. The results show that the ignition delay time increases exponentially with the decrease of concentration of oxygen in the oxidizer. However, the characteristic parameters, including the differential coefficient of temperature, the ratio of specific volume between the reactant and the product, and the combustible content existing in the product, all decrease with the decrease of concentration of oxygen in Oxidizer. Furthermore, the results of the sensitivity analysis show that, the content of H2 is of importance in determining the start of combustion of the biogas. Especially, the reaction,H-O2 →←OHq-O, play a more dominant role along with the concentration of oxygen in oxidizer becoming lower.
基金
国家重点基础研究发展(973)计划(2010CB227300)资助
关键词
生物质气
高温空气燃烧
着火延迟时间
敏感性分析
biogas
high temperature air combustion
ignition delay time
sensitivity analysis
