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TECHNICAL PAPERS: Gas Turbines: Review Papers in Combustion & Fuels

25Years of BBC/ABB/Alstom Lean Premix Combustion Technologies

[+] Author and Article Information
Klaus Döbbeling1

 Alstom Power, Brown Boveri Strasse 7, CH-401 Baden, Switzerlandklaus.doebbeling@power.alstom.com

Jaan Hellat

 Alstom Power, Brown Boveri Strasse 7, CH-401 Baden, Switzerland

Hans Koch2

 ABB, Raenkestrasse 23, CH-8700 Kuesnacht ZH, Switzerland

1

Author to whom correspondence should be addressed.

2

Retired.

J. Eng. Gas Turbines Power 129(1), 2-12 (Sep 28, 2005) (11 pages) doi:10.1115/1.2181183 History: Received August 25, 2005; Revised September 28, 2005

The paper will show the development of lean premix combustion technologies in BBC, ABB, and Alstom gas turbines. Different technologies have been developed and applied in Brown Boveri Company (BBC) before 1990. Considerable improvements with respect to NOx emissions as compared to gas turbines with a single combustor and a single diffusion burner for liquid and gaseous fuel have been achieved with burners with extended premixing sections and with multi-injection burners for annular combustors. Between 1990 and 2005, burners with short but effective premixing zones (EV burners: environmentally friendly V-shaped burners) have been implemented in all new gas turbines of the ABB (and later Alstom) fleet with NOx levels well below 25 vppmd (@15% O2). In addition to this, three variants of premix technologies have been successfully developed and deployed into Alstom GT engines: the sequential EV burners—a technology that allows premixing of natural gas and oil into a hot exhaust stream to reheat the exhaust gases of a first high-pressure turbine; the MBtu EV burners that are used to burn syngas in a premix flame with low NOx emissions; and the advanced EV burners (AEV) that are capable to prevaporize and premix liquid fuel prior to combustion and burn it with very low NOx emissions without water injection. The paper will give an overview of these technologies and their usage in Alstom gas turbines over the last 25years.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Burner and combustor development roadmap

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Figure 3

First generation of dry low-NOx burners

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Figure 4

(a) GT13 burners; (b) GT13 gas turbine

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Figure 5

NOx data as function of GT13 engine load

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Figure 6

Multi Injection Burner in the GT8 annular combustor

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Figure 9

EV burner cast body

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Figure 14

Delta-wing vortex generators

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Figure 15

Vortex generation and fuel injection in the SEV burner

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Figure 19

GT24/26 NOx [vppmd@15% O2] emissions on natural gas

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Figure 20

Design features of the AEV burner

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Figure 21

Axial (top) and tangential (bottom) velocity profiles in the AEV burner

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Figure 22

GT13E2 with annular premix combustor

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Figure 23

View into the annular premix combustor of the GT26 (burners and igniter removed)

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Figure 24

Engine integration of the annular single row combustor in the GT8C2

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Figure 25

Closed loop liner cooling system for annular premix combustors

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Figure 1

NOx reduction history

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Figure 7

EV burner principle

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Figure 8

EV burner axial flow field

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Figure 10

EV burner adapted to syngas application

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Figure 11

GT13E2-MBtu syngas operation, NOx emission as a function of GT load

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Figure 12

GT24/26 sequential combustion gas turbine

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Figure 13

GT24/26 reheat cycle

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Figure 16

Vortical flow pattern in the SEV burner

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Figure 17

View from downstream into the SEV burner (fuel lance removed)

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Figure 18

GT24/26 main components

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