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

Analysis of a Fuel Flexible Micro Gas Turbine Combustor Through Numerical Simulations

[+] Author and Article Information
Alessandro Bo

Department of Mechanical Engineering,
Roma Tre University,
Via Vito Volterra 62,
Rome 00146, Italy
e-mail: ing.alessandro.bo@gmail.com

Eugenio Giacomazzi

Energy Technology Department,
ENEA Casaccia Research Center,
Via Anguillarese 301,
Rome 00123, Italy
e-mail: eugenio.giacomazzi@enea.it

Giuseppe Messina, Antonio Di Nardo

Energy Technology Department,
ENEA Casaccia Research Center,
Via Anguillarese 301,
Rome 00123, Italy

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 22, 2017; final manuscript received June 28, 2018; published online August 20, 2018. Assoc. Editor: Eric Petersen.

J. Eng. Gas Turbines Power 140(12), 121504 (Aug 20, 2018) (10 pages) Paper No: GTP-17-1628; doi: 10.1115/1.4040737 History: Received November 22, 2017; Revised June 28, 2018

The work in this paper investigates on how a fuel flexible microgas turbine (MGT) combustion chamber, developed by ANSALDO ENERGIA and installed in a Turbec T100 P MGT, can operate when transferring from natural gas (NG) to a hydrogen-rich syngas. A syngas composition, which satisfies the fuel supply system specifications, is identified. Such syngas contains (by volume) 45% of hydrogen, 50% of carbon dioxide, and 5% of methane. The transfer procedure from NG to syngas is defined and modeled. A series of nonreactive and reactive Reynolds-averaged numerical simulations (RANS) on a full-scale three-dimensional (3D) model of the combustion chamber is then performed. The thermo-fluid dynamics inside its casing, the combustion regimes, the heat transfer across the liner walls as well as NOx emissions are evaluated. Results provide useful information on the operational problems associated with the fuel change and on how to define a successful fuel transfer procedure.

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Fig. 1

Schematics of the ARI 100 T2 combustor

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Fig. 2

Fuel mass flow rates evolution during the transfer procedure (m˙f,pilot,CH4=0.4 g/s=const) at 100% load

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Fig. 3

Fuel mole fraction evolution during the transfer procedure (m˙f,pilot,CH4=0.4 g/s=const) at 100% load

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Fig. 4

Schematics of the fuel flexible ARI 100 T2 combustor

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Fig. 5

SL and ϕpz evolution at 100% load (m˙f,pilot,CH4=0.4 g/s=const)

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Fig. 6

δL, SL, ST, and ST/SL evolution at 100% load (m˙f,pilot,CH4=0.4 g/s=const)

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Fig. 7

Validation of the Smooke simplified chemical mechanism for the composition at 300 s

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Fig. 8

Case 2—combustor outlet temperature

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Fig. 9

Radial temperature profile at the combustor outlet section and mass weighted average COT variation during the transition phase from methane to syngas

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Fig. 10

Heat of reaction (1–2 from top)

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Fig. 11

Case 2—liner inner walls temperature

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Fig. 12

Case 1–2 (from top)—combustion regimes



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