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Technology Reviews

Ultralow-Emission Combustion and Control System Installation Into Mature Power Plant Gas Turbines

[+] Author and Article Information
Jeffrey A. Benoit, Charles Ellis

Power Systems Manufacturing, LLC (PSM) An Alstom Company, Jupiter, FL 34990

Joseph Cook

 NV Energy, Las Vegas, NV 89014

J. Eng. Gas Turbines Power 133(2), 024001 (Oct 29, 2010) (7 pages) doi:10.1115/1.4002027 History: Received April 22, 2010; Revised May 06, 2010; Published October 29, 2010; Online October 29, 2010

The search for power plant sustainability options continues as regulating agencies exert more stringent industrial gas turbine emission requirements on operators. Purchasing power for resale, decomissioning current capabilities altogether, and repowering by replacing or converting existing equipment to comply with emission standards are economic-driven options contemplated by many mature gas turbine operators. One Las Vegas, NV operator, NV Energy, with four natural gas-fired W501B6 combined cycle units at their Edward W. Clark Generating Station, was in this situation in 2006. The units, originally configured with diffusion flame combustion systems, were permitted at 103 ppm NOx with regulatory mandates to significantly reduce NOx emissions to below 5 ppm by the end of 2009. Studies were conducted by the operator to evaluate the economic viability of using a selective catalytic reduction system, which would have forced significant modifications to the exhaust system and heat recovery steam generator, or convert the turbines to operate with dry low-emission combustion systems. Based on life cycle cost and installation complexity, the ultralow-emission combustion system was selected. This technical paper focuses on a short summary of the end user considerations in downselecting options, the ultralow emissions technology, and key features employed to achieve these low emissions, an overview of the conversion scope and a review and description of the control technology employed. Finally, a technical discussion of the low-emission operational flexibility will be provided including performance results of the converted units.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Emission upgrade considerations for mature power plants

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Figure 2

Edward W. Clark Generating Station, Las Vegas, NV

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Figure 3

Power station preconversion emission performance test

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Figure 4

PSM’s LEC-III® combustion system cross section

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Figure 5

Combustion system description

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Figure 7

LEC-III combustion liner head-end mixer effusion cooling holes

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Figure 8

Secondary fuel nozzle differences

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Figure 9

Fuel nozzle emission results (4)

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Figure 10

W501B6 gas turbine combustion cross section with LEC-III system

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Figure 11

Original 16 chamber count compressor combustor case and new 12-chamber design

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Figure 12

Campbell diagram showing first stage blade natural frequencies

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Figure 13

W501B6 gas turbine combustion system model with IBH system

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Figure 14

Result of evaluation of creep life of the last stage turbine blade

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Figure 15

Emission and dynamics results with LEC-III combustion system

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Figure 16

Reduction in combined cycle output resulting from LEC conversion

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