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

Jing, J., Zhang, C., Sun, W., An, J., Bi, J., & Li, Z. (2013). Influence of mass-flow ratio of inner to outer secondary air on gas–particle flow near a swirl burner. Particuology, 11(5), 540–548. https://doi.org/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

a Nuclear and Radiation Safety Center, MEP, Haidian, Beijing 100082, China
b School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

10.1016/j.partic.2012.09.010

Volume 11, Issue 5, October 2013, Pages 540-548

Received 23 November 2011, Revised 2 July 2012, Accepted 25 September 2012, Available online 1 April 2013.

E-mail: jingjianping@hit.edu.cn

Highlights

• The recirculation zone decreases with increasing mass-flow-rate ratio.

• Particle concentration in the central zone of burner is high.

• Particle volume flux profile has two peaks and two troughs.

• The burner exhibits better combustion characteristics at mass-flow-rate ratio of 0.43.

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

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