CO对甲烷燃烧影响机理研究
毕业论文关键词 一氧化碳 化学作用 混合燃料 污染物 甲烷 火焰结构
Title Study the effects of CO addition on the methane/air flameAbstractEffect of oxygenated fuel carbon monoxide additive on a lean,premixed ,one-Dimensional,lam-inar methane flames at atmospheric pressure with equivalence ratios 0.8 were study by kineticanalysis .A detailed kinetic analysis of the chemical effect of carbon monoxide additive on flamestructure and major species .The temperature field ,free radicals ,major species and pollutants arediscuss and take our great passion on the formations of soot precursor and oxygenated airpollutants (formaldehyde ,acetaldehyde ,ethenone ,methanol ).The results illustrate that theconcentration of acetylene ,ethylene,formaldehyde ,acetaldehyde ,ethenone and methanoldecrease when carbon monoxide additive .The chemical effect of carbon monoxide lead the peakmole fraction move toward to upstream side and suppress the produce of acetylene,ethylene andethenone.But ,it’s chemical effect have slightly effect on formaldehyde and significantlyfacilitate the formation of acetaldehyde and methanol.The concentration of free radicals H ,Oand OH increase as methane is replace by carbon monoxide, we attribute this phenomenon to itschemical effects .Also ,we found the chemical effect on free radicals of O and H is moresignificant. Nitric oxide mole fraction diminish have similar fashion with formaldehyde andacetaldehyde.in a other words ,The decrease of Nitric oxide in the flames cause by dilution andthermal effect is larger than the increase of Nitric oxide mole fraction caused by chemicaleffects.
Keywords Carbon monoxide Chemical effects Blended fuel Pollutant Methane Flame structure
目 次
1 绪论 1
1.1 研究的背景及意义 1
1.1.1 研究背景 1
1.1.2 研究意义 1
1.2 国内外的研究现状 2
1.2.1 H2稀释剂对火焰影响的研究现状 2
1.2.2 其它稀释剂对火焰影响的研究现状 3
1.2.3 CO 稀释剂对火焰影响的研究现状 4
2 燃烧化学反应动力学及分析方法7
2.1 CHEMKIN 软件及 PREMIX 模块简介 7
2.1.1 CHEMKIN 软件介绍 7
2.1.2 PREMIX 模块介绍 8
2.2 燃烧的化学反应动力学机理 8
2.3 研究及分析思路 9
2.4 火焰工况介绍 9
3 结果和分析 11
3.1 火焰物理结构 11
3.1.1 温度分布 11
3.1.2 绝热火焰温度 12
3.2 火焰化学结构 13
3.2.1 CH4 13
3.2.2 自由基 O、 H、 OH、 CH3 16
3.2.3 CO、 CO2、 O2、 H2 19
3.2.4 H2O 21
3.3 潜在污染物分析 22
3.3.1 C2H2、C2H4 22
3.3.2 CH2O、CH3CHO、CH2CO、CH3OH 27
3.3.3 小结 35
3.4 NOX 36
结论 39
致谢 41
参考文献42
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