掺混氢气对乙醇燃烧的化学作用模拟研究

摘要

为了更好地了解掺入氢气对乙醇燃烧时的作用机理,利用CHEMKIN PRO程序,对稀燃工况下的乙醇/氢气预混层流燃烧进行了化学反应动力学分析,采用一种辨识方法,对不同掺氢体积分数下,掺氢对乙醇燃烧的主要产物和中间产物的化学作用及热/稀释作用进行了区分、研究和讨论.结果表明:氢气的化学作用会促进乙醇消耗和中间组分的生成,并使其反应摩尔分数分布曲线向反应上游移动,增加反应速率;而热/稀释作用会抑制组分的生成,使反应摩尔分数分布曲线向下游移动,减缓反应速率;综合作用会使掺氢后的化学反应提前发生,并对有害污染物甲醛的产生起到抑制作用.%In order to study the effect of hydrogen addition on ethanol combustion, the kinetic analysis of ethanol blended hydrogen premixed laminar combustion at learn combustion condition was conducted by using CHEMKIN PRO code. The chemical effects and thermal/dilution effects of major and intermediate species in hydrogen blended ethanol flame were distinguished and discussed. Results show that the chemical effects of hydrogen addition promot the consumption of ethanol and production of intermediate species, shift the profiles of that to the upstream sides, also increase the reaction rates. However, the thermal/dilution effects inhibit the production of that and reduce the reaction rates. The combined effects of hydrogen additive make the chemical reaction begin in advance, inhibit the production of formaldehyde pollution.