低NO_x旋流燃烧器一、二次风混合特性分析  

Analysis of the Mixing Between Primary Air and Secondary Air in a Low NO_x Swirl Burner

作　　者：周志军[1] 周丛丛[1] 许建华 周俊虎[1] 刘茂省[1] 刘建忠[1] 岑可法[1] 

机构地区：[1]能源清洁利用国家重点实验室(浙江大学),浙江省杭州市310027 [2]国华电力公司北京热电分公司,北京市朝阳区100044

出　　处：《中国电机工程学报》2010年第11期8-14,共7页Proceedings of the CSEE

基　　金：国家高技术研究发展计划项目(863计划)(2008AA05Z304)~~

摘　　要：在设计的新型低NOx旋流燃烧器中,采用温度示踪法研究一、二次风的混合情况。通过分析冷态煤粉浓度的分布及煤粉高浓度区域面积的大小,得到:中心管扩角越小,二次风混入越晚,冷态高煤粉浓度区域面积越大;一次风率为0.2、一次风速为15m/s、直流二次风速为25m/s时冷态高煤粉浓度区域面积较大,有利于降低NOx的生成;内二次风旋流开度减小较外二次风旋流开度减小对冷态高煤粉浓度区域面积的影响大;内旋流强度为1.35、外旋流强度为1.56为最佳的试验工况。Temperature trace method was used to study the mixing between the primary air and the secondary air in a newly-designed low NOx swirl burner. Through the anatysis of the distributions of cold pulverized coal concentration and the area of high concentration zone, it was concluded that the smaller the central air expanding angte was, or the later the secondary air interfused, the larger the area of high concentration zone was. When the primary air fraction was 0.2 with a velocity of 15 m/s, and the once-through secondary air velocity was 25m/s, the high concentration zone was rather large in favor of NO reduction. The swirling number of inner secondary air played a more important role than that of the outer secondary air for NO reduction, when the swirling number of inner secondary air at 1.35 and the swirling number of outer secondary air at 1.56 were suggested to be optimal.

关 键 词：低NOx旋流燃烧器 温度示踪法 混合 冷态煤粉浓度 

分 类 号：TK227[动力工程及工程热物理—动力机械及工程]