The flame characteristics of a pilot-scale swirl burner for air and oxy-fuel combustion of pulverized coal are investigated. The local burner air (or oxygen) ratio λ and the oxygen concentration have been systematically varied. The investigated flames were characterized recording UV emissions originating from OH* chemiluminescence indicating the reaction zone in the gas phase, measuring the axial and tangential velocities using an laser Doppler velocimetry (LDV) system and analyzing the composition of the flue gas. A change of the flame structure was revealed from the conducted measurement: the “regular” flame for the investigated burner is characterized by a cone-shaped swirling combustion zone with a distinct inner recirculation zone. Reducing the oxidizer flows through the burner leads to a breakdown of the inner recirculation zone and a significant change of the flame pattern. This change was identified by the LDV measurements as well as from the chemiluminescence images, and it was found to be closely related to the momentum flow through the burner into the main combustion zone.
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July 2016
Research-Article
Comparison of Flame Stability Under Air and Oxy-Fuel Conditions for an Aerodynamically Stabilized Pulverized Coal Swirl Flame
Martin Habermehl,
Martin Habermehl
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
e-mail: info@wsa.rwth-aachen.de
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
e-mail: info@wsa.rwth-aachen.de
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Johannes Hees,
Johannes Hees
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
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Anna Maßmeyer,
Anna Maßmeyer
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
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Diego Zabrodiec,
Diego Zabrodiec
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
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Oliver Hatzfeld,
Oliver Hatzfeld
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
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Reinhold Kneer
Reinhold Kneer
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Search for other works by this author on:
Martin Habermehl
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
e-mail: info@wsa.rwth-aachen.de
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
e-mail: info@wsa.rwth-aachen.de
Johannes Hees
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Anna Maßmeyer
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Diego Zabrodiec
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Oliver Hatzfeld
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Reinhold Kneer
Department of Mechanical Engineering,
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
Institute for Heat and Mass Transfer,
RWTH Aachen University,
Aachen 52056, Germany
1Corresponding author.
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 31, 2015; final manuscript received February 22, 2016; published online March 24, 2016. Assoc. Editor: Ashwani K. Gupta.
J. Energy Resour. Technol. Jul 2016, 138(4): 042209 (8 pages)
Published Online: March 24, 2016
Article history
Received:
July 31, 2015
Revised:
February 22, 2016
Citation
Habermehl, M., Hees, J., Maßmeyer, A., Zabrodiec, D., Hatzfeld, O., and Kneer, R. (March 24, 2016). "Comparison of Flame Stability Under Air and Oxy-Fuel Conditions for an Aerodynamically Stabilized Pulverized Coal Swirl Flame." ASME. J. Energy Resour. Technol. July 2016; 138(4): 042209. https://doi.org/10.1115/1.4032940
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