Partic. vol. 11 no. 5 pp. 540-548 (October 2013)
doi: 10.1016/j.partic.2012.09.010

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

Jianping Jing^{a, b, *}, Chunming Zhang^a, Wei Sun^a, Jieruo An^a, Jinsheng Bi^a, Zhengqi Li^b

jingjianping@hit.edu.cn

Abstract

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 particle 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.

Graphical abstract

Keywords

Swirl burner; Gas–particle flow; Three-dimensional particle-dynamics anemometer