Numerical Investigation of the Effects of Swirl-Vane Angle and Particle Size on Combustion and Flow Characteristics in a Vertical Cyclone Barrel
Publication: Journal of Energy Engineering
Volume 146, Issue 4
Abstract
The cyclone-fired boiler has become a very competitive boiler type for utilizing coal with a low ash melting point and high alkali. Because of the higher combustion intensity in the cyclone barrel, good flow and combustion performances are of great significance to the safe and efficient operation of the cyclone-fired boiler. The flow and combustion characteristics in a vertical cyclone barrel were numerically investigated, which has never been done before to the author’s knowledge. The results showed that the pulverized coal particles are spun forward in the cyclone barrel driven by the tangentially rotating airflow, and the maximum velocity in the cyclone barrel is in the annular zone near the barrel wall. With the decrease in the swirl-vane angle of the primary air inlet or the increase in the particle diameter, the location where the particles collided with the barrel wall moves up along the axial direction of the cyclone barrel and the colliding chance increases. For the vertical cyclone barrel, the optimum particle diameter range is 70–110 μm, so the capture ratio of particles is greater than 99.4%.
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Data Availability Statement
The following data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request:
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Detailed mathematical model; and
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Data extracted from the results of the numerical simulation. (Figs. 5–14).
Acknowledgments
This work was financially supported by the National Key Research and Development Program of China under Grant No. 2018YFB0604101 and the China Postdoctoral Science Foundation under Grant No. 2018M643643.
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Published In
Journal of Energy Engineering
Volume 146 • Issue 4 • August 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Oct 31, 2019
Accepted: Mar 4, 2020
Published online: May 21, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 21, 2020
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