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Research Papers: Gas Turbines: Cycle Innovations

Combustion Simulation of an Exhaust Gas Recirculation Operated Micro-gas Turbine

[+] Author and Article Information
Maria Cristina Cameretti, Renzo Piazzesi, Fabrizio Reale, Raffaele Tuccillo

Dipartimento di Ingegneria Meccanica per l'Energetica (D.I.M.E.), Università di Napoli Federico II, Via Claudio 21, Napoli 80125, Italy

J. Eng. Gas Turbines Power 131(5), 051701 (May 26, 2009) (10 pages) doi:10.1115/1.3078193 History: Received July 27, 2008; Revised September 10, 2008; Published May 26, 2009

Following their recent experiences in the search of methods for reducing the nitric oxide emissions from a micro-gas turbine, the authors discuss in this paper the results of the combustion simulation under different conditions induced by the activation of an exhaust recirculation system. The theoretical approach starts with a matching analysis of the exhaust gas recirculation equipped microturbine, and then proceeds with the computational fluid dynamics analysis of the combustor. Different combustion models are compared in order to validate the method for NOx reduction by the point of view of a correct development of the chemically reacting process.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Plant layout of the micro-gas turbine with internal and external heat recovery and with the exhaust recirculation option

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Figure 2

Operating map of the MGT with efficiency and NOx levels

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Figure 3

Operating map of the MGT with variably recuperated cycles

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Figure 4

The effect of the recuperator by-pass on the actual exhaust recirculation fractions

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Figure 5

Thermal NO emission map for variable speed EGR operated micro-gas turbine

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Figure 6

Thermal NO emission map for constant speed EGR operated micro-gas turbine with variably recuperated cycles

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Figure 7

Operating map of the MGT with efficiency and NO levels, for constant speed and variable EGR ratios

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Figure 8

The EGR effect on MGT efficiency and emissions

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Figure 9

The EGR effect on the oxidant composition

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Figure 10

The lean-premixed combustor

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Figure 11

2D computational domain and details of the block-structured mesh

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Figure 12

Temperature distributions for different combustion regimes

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Figure 13

Temperature distributions for different combustion regimes

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Figure 14

Nitric oxide distributions for different combustion regimes

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Figure 15

Contours of maximum temperature estimated in the flamelet tables

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Figure 16

Laminar flame speed profiles for different oxidant compositions

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Figure 17

Comparison of reaction rates with the different combustion models

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Figure 18

Comparison of temperature profiles with the different combustion models

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Figure 19

Temperature distributions for different combustion regimes

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Figure 20

Comparison of turbulence level profiles with the different combustion models

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Figure 21

EGR effect on the axial profiles of the laminar flame speed

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Figure 22

EGR effect on the axial profiles of the turbulent flame speed

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Figure 23

EGR effect on the axial profiles of gas temperature

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Figure 24

EGR effect on the axial profiles of the NO formation rate

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