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Research Papers: Fuel Combustion

Comparison of Flame Stability Under Air and Oxy-Fuel Conditions for an Aerodynamically Stabilized Pulverized Coal Swirl Flame

[+] Author and Article Information
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

Johannes Hees, Anna Maßmeyer, Diego Zabrodiec, Oliver Hatzfeld, Reinhold Kneer

Department of Mechanical Engineering,
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 138(4), 042209 (Mar 24, 2016) (8 pages) Paper No: JERT-15-1292; doi: 10.1115/1.4032940 History: Received July 31, 2015; Revised February 22, 2016

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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Figures

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Fig. 1

Cross sections of the combustion chamber and the employed burner (all dimensions in mm): (a) vertical cross section through the combustion chamber, (b) horizontal cross section through the observation ports, and (c) cross section through the burner

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Fig. 2

Chemiluminescence intensities for the AIR cases (arbitrary units)

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Fig. 3

Mean axial velocities for AIR at two different distances x from the burner: (a) λlocal = 1; (b) λlocal = 0.6

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Fig. 4

Chemiluminescence intensities for the OXY-25 cases (arbitrary units)

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Fig. 5

Mean axial velocities for OXY-25 at two different distances x from the burner: (a) λlocal = 1.0; (b) λlocal = 0.6

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Fig. 6

Chemiluminescence intensities for the OXY-21 cases (arbitrary units)

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Fig. 7

Mean axial velocities for OXY-21 at two different distances x from the burner: (a) λlocal = 1.0; (b) λlocal = 0.6

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