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research-article

Extension of Fuel Flexibility by Combining Intelligent Control Methods for Siemens SGT-400 Dry Low Emission Combustion System

[+] Author and Article Information
Kexin, K Liu

Siemens Industrial Turbomachinery Ltd, Lincoln LN7 5FD, UK
kexin.liu@siemens.com

Phillip Hubbard

Siemens Industrial Turbomachinery Ltd, Lincoln LN7 5FD, UK
phill.hubbard-gtec@siemens.com

Suresh K. Sadasivuni

Siemens Industrial Turbomachinery Ltd, Lincoln LN7 5FD, UK
suresh.sadasivuni@siemens.com

Ghenadie Bulat

Siemens Industrial Turbomachinery Ltd, Lincoln LN7 5FD, UK
ghenadie.bulat@siemens.com

1Corresponding author.

ASME doi:10.1115/1.4040689 History: Received June 21, 2018; Revised June 26, 2018

Abstract

Extension of gaseous fuel flexibility for an industrial gas turbine combustor system is reported. A SGT-400 engine with hybrid combustion system configuration to meet specific requirements was string tested. This engine was tested to operate on and switch between three different fuels with temperature corrected Wobbe Index varying between 45 MJ/m3, 38 MJ/m3 and 30 MJ/m3. The alteration of fuel heating value was achieved by injection or withdrawal N2 into or from the fuel system. The results show that the engine can maintain stable operation on, and switching between these three different fuels with fast changeover rate of the heating value greater than 10% per minute without shutdown or change in load condition. High pressure rig tests were carried out to demonstrate the capabilities of the combustion system at engine operating conditions across a wide range of ambient conditions. Variations of the fuel heating value, with temperature corrected Wobbe Index of 30 MJ/m3, 33 MJ/m3, 35 MJ/m3 and 45 MJ/m3 , were achieved by blending natural gas with CO2 as diluent. Emissions, combustion dynamics, fuel pressure and flashback monitoring via measurement of burner metal temperatures, were the main parameters used to evaluate the impact of fuel flexibility on combustor performance. Test results show that NOx emissions decrease as the fuel heating value is reduced. Also note that a decreasing fuel heating value leads to a requirement to increase the fuel supply pressure.

Copyright (c) 2018 by ASME
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