Influence of mass-flow ratio of inner to outer secondary air on gas-particle flow near a swirl burner

• Published in: Particuology Vol. 11; no. 5; pp. 540 - 548
• Main Authors: Jing, Jianping, Zhang, Chunming, Sun, Wei, An, Jieruo, Bi, Jinsheng, Li, Zhengqi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2013
• Subjects: Gas–particle flow; Swirl burner; Three-dimensional particle-dynamics anemometer; 二次空气; 平均速度; 旋流燃烧器; 比率; 气体; 流动特性; 粒子流; 质量流率; Swirl burner; Three-dimensional particle-dynamics anemometer; Gas–particle flow
• ISSN: 1674-2001; 2210-4291
• DOI: 10.1016/j.partic.2012.09.010

The influence of mass-flow-rate ratio of inner to outer secondary air on gas-particle flow characteristics was determined in the near-burner region of a centrally fuel-rich swirl coal combustion burner, Velocity and particle volume flux profiles and normalized particle number concentrations were obtained. Peaks in tangential mean velocity and three-dimensional root-mean-square fluctuation velocities were found to decrease as the mass-flow-rate ratio increased. Moreover, the peaks in the mean axial velocities and parti- cle volume flux near the wall increased, whereas those near the chamber axis decreased. Simultaneously, both recirculation zone and swirl number decreased as the mass-flow-rate ratio increased.