CO_2稀释及合成气构成对预混燃烧特性的影响  

Effect of CO2-Diluted Oxygen and Syngas Composition on Characteristics of Premixed Flame

作　　者：安江涛[1] 蒋勇[1] 邱榕[1] 李山岭[1] 胡勇[1] 

机构地区：[1]中国科技大学火灾科学国家重点实验室,合肥230026

出　　处：《燃烧科学与技术》2011年第5期437-442,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51176181);国家重点基础研究发展计划(973计划)资助项目(2012CB719704)

摘　　要：用CO2代替N2作氧化剂的稀释气体不但可以减少NOx的排放,还能有效回收利用CO2.CO2具有与N2不同的物理、化学性质,通过对合成气与不同CO2稀释程度氧化剂的预混燃烧计算发现,CO2体积分数的增加会降低火焰温度进而降低燃烧速度,增加化学反应滞留时间.通过对贫燃拉伸火焰的研究发现,在CO2稀释氧化剂环境下,合成气中H2比例的增加可以有效增加火焰面的健壮性.对Karlovizt数的分析发现,H2比例的增加可以降低Karlovizt数,而Karlovizt数的局部表达形式能更好地体现拉伸极限的物理本质.In order to reduce the emission of nitrogen oxides （NOx）and reuse the carbon dioxide （CO2） produced through combustion, numerical simulation was conducted on the premixed flame of CO2-diluted oxygen and different syngas composition under non-stretched and stretched conditions. It was found that increasing of the proportion of CO2 in the oxidant can reduce the adiabatic temperature and slow down the burning velocity of freely propagating premixed flames, and then indirectly increase the characteristic residence time, especially in lean flames. Higher H2 composition in the syngas can improve the robustness of the flame front under different stretched factors. The Kar- lovizt number and local Karlovizt number were also considered in this paper. Higher H2 composition obviously decrease the value of the Karlovizt number and local Karlovizt number, and the local Karlovizt number presents a better tendency for the previous conclusions.

关 键 词：二氧化碳 合成气 层流燃烧速度 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]