Measurement and simulation of swirling coal combustion--颗粒学报PARTICUOLOGY

Hu, L., Zhou, L., Luo, Y., & Xu, C. (2013). Measurement and simulation of swirling coal combustion. Particuology, 11(2), 189–197. https://doi.org/10.1016/j.partic.2012.05.009

Measurement and simulation of swirling coal combustion

Liyuan Hu ^a, Lixing Zhou ^b *, Yonghao Luo ^a, Caisong Xu ^a

a School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, China
b Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

10.1016/j.partic.2012.05.009

Volume 11, Issue 2, April 2013, Pages 189-197

Received 22 November 2011, Revised 23 March 2012, Accepted 14 May 2012, Available online 8 November 2012.

E-mail: zhoulx@mail.tsinghua.edu.cn

Highlights

► PIV measurement with large-eddy simulation was carried out for studying swirling coal combustion.

► LES statistical results were validated by the measurement results.

► LES results show interactions among coherent structures, coal particles and flame structures.

► Effect of secondary-air ratio on NO formation was studied by the measurement results.

Abstract

Particle image velocimetry (PIV), thermocouples and flue gas analyzer are used to study swirling coal combustion and NO formation under different secondary-air ratios. Eulerian–Lagrangian large-eddy simulation (LES) using the Smagorinsky–Lilly sub-grid scale stress model, presumed-PDF fast chemistry and eddy-break-up (EBU) gas combustion models, particle devolatilization and particle combustion models, are simultaneously used to simulate swirling coal combustion. Statistical LES results are validated by measurement results. Instantaneous LES results show that the coherent structures for swirling coal combustion are stronger than those for swirling gas combustion. Particles are shown to concentrate along the periphery of the coherent structures. Combustion flame is located in the high vorticity and high particle concentration zones. Measurement shows that secondary-air ratios have little effect on final NO formation at the exit of the combustor.

Graphical abstract

Keywords

PIV measurements; Large-eddy simulation; Swirling coal combustion

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