旋流对同轴富氧扩散燃烧NOx排放的影响  

Effects of Swirl on NO_x Emission in Coflow Oxygen-Enriched Laminar Diffusion Flames

作　　者：赵黛青[1] 杨浩林[1,2] 杨卫斌[1] 

机构地区：[1]中国科学院广州能源研究所,广州510640 [2]中国科学技术大学热科学和能源工程系,合肥230027

出　　处：《燃烧科学与技术》2008年第5期383-387,共5页Journal of Combustion Science and Technology

基　　金：广东省自然科学基金资助项目(032703);广州市科技计划资助项目(2003J1-C0181)

摘　　要：对30％-40％的氧浓度下甲烷富氧空气同轴扩散燃烧的火焰形态、可见火焰高度、燃烧特性以及NOx排放进行了实验测量，研究了旋流数对NOx排放控制的影响．结果显示，随着旋流数的增加，火焰高度略有升高，火焰发光由白色逐渐变为橙黄色；最高火焰温度逐渐降低，温度分布也变得平坦；NOx排放指数随旋流数的增加而降低，氧浓度越高，其下降幅度越大．保持其他条件不变，增加氧化剂流速可以增强旋流对燃烧特性及NOx排放的影响．Measurements of flame appearance, visible flame height, temperature, flow field and NOx emission indes in swirling methane / 30% -40% oxygen-enriched air coflow jet diffusion flames are reported. Different swirl number, oxygen concentration, and oxidant velocity are employed to investigate NOx emission characteristics. With the increase of swirl number, the visible flame height increases slightly and the overall flame color changes from white to yellow; the maximum flame temperature gradually decreases and the profiles turn smooth ; NOx emission index, decreases at an increasing rate as oxygen concentration increases. In addition, the effects of swirl flow on combustion characteristics and NOx emission are enhanced by increasing oxidant velocity.

关 键 词：富氧燃烧 旋流 扩散火焰 NOx 

分 类 号：TK16[动力工程及工程热物理—热能工程]