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TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

Cycle Optimization and Combustion Analysis in a Low-NOx Micro-Gas Turbine

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

Dipartimento di Ingegneria Meccanica per l’Energetica (D.I.M.E.),  Università di Napoli Federico II, Italy

J. Eng. Gas Turbines Power 129(4), 994-1003 (Dec 03, 2006) (10 pages) doi:10.1115/1.2718232 History: Received May 16, 2006; Revised December 03, 2006

The authors discuss in this paper the potential of a method for NOx suppression from power plants based on microgas turbines. The method is based on the mild combustion concept but needs to be adapted to the actual operating parameters of the microturbine, thus resulting in an effective employment of the flue gas recirculation for diluting the oxygen in the inlet air. The results are first presented on a thermodynamic basis, and some cases are then analyzed with a computational fluid dynamics simulation. Both approaches suggest good perspectives for the nitric oxide control but also highlight some disadvantages in terms of increase in carbon species.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematics of micro-gas turbine integrated with devices for recuperated cycle and heat recovery

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Figure 2

Modified plant layout with the exhaust recirculation option

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Figure 3

Emission and performance parameter trend with the EGR ratio

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Figure 4

Combined effect of the by-pass and EGR ratio on the MGT performance parameters

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Figure 5

Combined effect of the by-pass and EGR ratio on the thermal NO formation

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Figure 6

Effect of variable-load, variable EGR ratio on the conditions for the thermal NO formation

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Figure 7

Lean premixed combustor

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Figure 8

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

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Figure 9

Temperature and NO distributions from FLUENT calculations

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Figure 10

A comparison of FLUENT and KIVA results

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Figure 11

Temperature distributions for different combustion regimes

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Figure 12

Thermal NO distributions (ppm) for different combustion regimes

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Figure 13

Axial distributions for different combustion regimes

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Figure 14

Axial distributions for different combustion regimes

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Figure 15

Temperature distributions at part-load conditions

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Figure 16

Axial distributions at part-load conditions

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Figure 17

Thermal NO distributions (ppm) at partly recuperated conditions

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