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Research Papers: Energy Conversion/Systems

Dual Injection Distributed Combustion for Gas Turbine Application

[+] Author and Article Information
Ahmed E. E. Khalil

Research Assistant
Department of Mechanical Engineering,
University of Maryland,
College Park, MD 20742
e-mail: aekhalil@umd.edu

Ashwani K. Gupta

Distinguished University Professor
Department of Mechanical Engineering,
University of Maryland,
College Park, MD 20742
e-mail: akgupta@umd.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received May 14, 2013; final manuscript received July 11, 2013; published online August 19, 2013. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 136(1), 011601 (Aug 19, 2013) (5 pages) Paper No: JERT-13-1151; doi: 10.1115/1.4025020 History: Received May 14, 2013; Revised July 11, 2013

Distributed combustion has been shown to provide significantly improved performance with near zero emissions for stationary gas turbine applications. Characteristics of distributed combustion include uniform thermal field in the entire combustion chamber (improved pattern factor), ultra-low emissions of NOx and CO, low noise, enhanced stability, and higher efficiency. Distributed combustion with swirl have been investigated to determine the beneficial aspects of such flows on clean and efficient combustion under simulated gas turbine combustion conditions with ultra-low NOx emissions. Results are presented here on the impact of employing dual injection of air and fuel in contrast to single injection. Dual and multi-injection is of great importance for combustor design scale up as to maintain flow similarities. Results showed that careful implementation of dual injection can result in emissions as low as single air/fuel injection method. With adequate fuel injection strategy, further reduction in emissions has been demonstrated. Results obtained on pollutants emission with dual injection and different fuel injection strategies at various equivalence ratios showed ultra-low emission (<5 PPM NO and <15 PPM CO) and high performance. OH* chemiluminescence revealed relative position of the flame within the combustor under various conditions for further improvements in distributed combustion conditions and to further reduce NOx emission.

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Figures

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Fig. 1

Schematic diagram of the combustor with extended axial exit “at” (left: top section at midlocation and right: combustor interior)

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Fig. 2

High intensity CDC cylindrical combustor test rig with optical access (left) and axial product gas exit (right)

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Fig. 3

Colorless combustion with dual air/fuel injection

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Fig. 4

NO and CO emissions for single injection case

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Fig. 5

NO emissions for single and dual injection cases

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Fig. 6

OH* chemiluminescence intensity for dual injection case

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Fig. 7

OH* chemiluminescence intensity for single injection case

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Fig. 8

NO emissions for fuel distribution variation dual injection cases

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Fig. 9

OH* chemiluminescence intensity for dual injection fuel distribution variation cases

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