Particle sticking behavior near the throat of a low-NOₓ axial-swirl coal burner

• Published in: Applied energy Vol. 88; no. 3; pp. 650 - 658
• Main Authors: Li, Zhengqi, Zeng, Lingyan, Zhao, Guangbo, Shen, Shanping, Zhang, Fucheng
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.03.2011; Elsevier
• Series: Applied Energy
• Subjects: air; air flow; Applied sciences; boilers (processing); coal; Combustion of solid fuels; Combustion. Flame; Energy; Energy. Thermal use of fuels; equipment design; Exact sciences and technology; mathematical models; nitrogen oxides; slags; Swirl burner Numerical simulation Particle sticking behavior; Theoretical studies. Data and constants. Metering; throat; Particle sticking behavior; Swirl burner; Numerical simulation
• ISSN: 0306-2619; 1872-9118
• DOI: 10.1016/j.apenergy.2010.08.015

The results of numerical simulations of particle sticking behavior near the throat of a low-NOₓ axial-swirl burner in a 600-MWₑ bituminous coal burned boiler are presented. A comparison of simulation results with measurements using a probe with hot-film sensors shows that the numerical model offers a reasonable description. Calculated results of slagging show that slag build-up is substantial near the throat of the designed burner and that the sticking-particle ratio is as much as 33.2%. Because central and primary air streams remain unchanged, the mass flux of the inner secondary air is 3.25kgs⁻¹ while that of the outer secondary air is 12.16kgs⁻¹; however, the sticking-particle ratio can still be lowered to as little as 9.6%. By adjusting the outer secondary air blade angle to 15°, the sticking-particle ratio can be further lowered to 8.73%.