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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Influence of Burner Material, Tip Temperature, and Geometrical Flame Configuration on Flashback Propensity of H2-Air Jet Flames

[+] Author and Article Information
Vincent McDonell

UCI Combustion Laboratory,
University of California,
Irvine, CA 92697-3550

Thomas Sattelmayer

Lehrstuhl für Thermodynamik,
Technische Universität München,
Boltzmannstrasse 15,
Garching D-85747, Germany

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 3, 2013; final manuscript received July 29, 2013; published online October 28, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(2), 021502 (Oct 28, 2013) (10 pages) Paper No: GTP-13-1230; doi: 10.1115/1.4025359 History: Received July 03, 2013; Revised July 29, 2013

Flashback is a key operability issue for low emission premixed combustion systems operated on high hydrogen content fuels. Previous work investigated fuel composition impacts on flashback propensity and found that burner tip temperature was important in correlating flashback data in premixed jet flames. An enclosure around the jet flame was found to enhance the flame–burner rim interaction. The present study further addresses these issues using a jet burner with various geometric configurations and interchangeable materials. Systematic studies addressing the quantitative influence of various parameters such as tip temperature, burner material, enclosure size, and burner diameter on flashback propensity were carried out. A comprehensive overview of the flashback limits for all conditions tested in the current study as well as those published previously is given. The collective results indicate that the burner materials, tip temperature, and flame confinement play significant roles for flashback propensity and thus help explain previous scatter in flashback data. Furthermore, the present work indicates that the upstream flame propagation during flashback is affected by the burner material. The material with lower thermal conductivity yields larger flashback propensity but slower flame regression inside the tube. These observations can be potentially exploited to minimize the negative impacts of flashback in practical applications.

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References

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Figures

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Fig. 1

Schematic of the axisymmetric single injector rig and associated supporting hardware (UCI burner [30])

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Fig. 2

Schematic of the enclosure holder (UCI injector [30])

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Fig. 3

Injector with ceramic block (UCI burner)

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Fig. 4

Schematic of TUM/BACATEC setup

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Fig. 5

Schematic of the pilot burner (TUM/BACATEC [31])

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Fig. 6

Definition of the burner type: (a) UCI's setup and (b) TUM/BACATEC's setup

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Fig. 7

Schematic of the thermocouple alignment (UCI burner [30])

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Fig. 8

Response of the sensors (pressure transducer and TC) to FB event (sample rate = 10 Hz)

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Fig. 9

Results of the cooling effect test with 40 mm stainless tube: FB EQ versus gc

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Fig. 10

Results of the cooling effect test with 40 mm stainless tube: FB EQ versus tip temperature

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Fig. 11

Comparison of measured and predicted gc value using Eq. (2)

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Fig. 12

Effect of enclosure (i.d. = 63.5 mm) on FB limits (** [23])

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Fig. 13

Effect of enclosure on the tip temperature (stainless burner only)

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Fig. 14

Effect of enclosure size on the critical velocity gradient (AFT = 1700 and 1900 K)

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Fig. 15

Effect of enclosure size on the tip temperature (AFT = 1700 and 1900 K)

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Fig. 16

Process of flame propagation in the quartz tube due to heat conduction from the block to burner

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Fig. 17

Effect of confinement on FB limits, AFT = 1700 K (* [25])

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Fig. 18

Material effects on the FB propensity

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Fig. 19

Effect of burner material on the tip temperature

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Fig. 20

Overview of the test results with various injector configuration: diameter-burner type–material-temp ctrl: * [25], ** [23], *** [20]

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