Analysis of the mixing between primary air and secondary air in a low NOxswirl burner

作者：Zhou Zhi Jun^*; Zhou Cong Cong; Xu Jian Hua; Zhou Jun Hu; Liu Mao Sheng; Liu Jian Zhong; Cen Ke Fa

来源：Proceedings of the CSEE, 2010, 30(11): 8-14.

• Air mixing
• Low NOxswirl burner
• Pulverized coal concentration
• Swirl burner
• Trace methods

Temperature trace method was used to study the mixing between the primary air and the secondary air in a newly-designed low NOxswirl burner. Through the analysis 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 angle 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.

• 出版日期2010
• 单位浙江大学