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Off-design performance investigation of a low calorific value gas fired generic type single-shaft gas turbine

Orbay, Raik LU ; Eriksson, Pontus LU ; Genrup, Magnus LU and Klingmann, Jens LU (2007) 2007 ASME Turbo Expo In Proceedings of the ASME Turbo Expo 2. p.733-741
Abstract
When low calorific value gases are fired, the performance and stability of gas turbines may deteriorate due to a large amount of inert ballast and changes in working fluid properties. Since it is rather rare to have custom-built gas turbines for low Lower Heating Value (LHV) operation, the engine will be forced to operate outside its design envelope. This, in turn, poses limitations to usable fuel choices. Typical restraints are decrease in Wobbe-index and surge- and flutter-margins for turbomachinery. In this study, an advanced performance deck has been used to quantify the impact of firing low-LHV gases in a generic type gas turbine. A single-shaft gas turbine characterized by a compressor and an expander map is considered. Emphasis has... (More)
When low calorific value gases are fired, the performance and stability of gas turbines may deteriorate due to a large amount of inert ballast and changes in working fluid properties. Since it is rather rare to have custom-built gas turbines for low Lower Heating Value (LHV) operation, the engine will be forced to operate outside its design envelope. This, in turn, poses limitations to usable fuel choices. Typical restraints are decrease in Wobbe-index and surge- and flutter-margins for turbomachinery. In this study, an advanced performance deck has been used to quantify the impact of firing low-LHV gases in a generic type gas turbine. A single-shaft gas turbine characterized by a compressor and an expander map is considered. Emphasis has been put on predicting the off-design behavior. The combustor is discussed and related to previous experiments which include investigation of flammability limits, Wobbe-index, flame position, etc. The computations show that at constant turbine inlet temperature (TIT), the shaft power and the pressure ratio will increase, however the surge margin will decrease. Possible design changes in the component level are also discussed. Aerodynamic issues (and necessary modifications) that can pose severe limitations on the gas turbine compressor- and turbine sections are discussed. Typical methods for axial turbine capacity adjustment are presented and discussed. Copyright © 2007 by ASME. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Low Lower Heating Value (LHV), Expander map, Inert ballast, Wobbe-index
in
Proceedings of the ASME Turbo Expo
volume
2
pages
733 - 741
publisher
American Society Of Mechanical Engineers (ASME)
conference name
2007 ASME Turbo Expo
external identifiers
  • WOS:000252771800072
  • Scopus:34548792391
language
English
LU publication?
yes
id
71fa09e3-7de8-43a2-b648-231a6bf9d75c (old id 643346)
date added to LUP
2007-12-04 11:39:43
date last changed
2017-01-01 08:01:20
@inproceedings{71fa09e3-7de8-43a2-b648-231a6bf9d75c,
  abstract     = {When low calorific value gases are fired, the performance and stability of gas turbines may deteriorate due to a large amount of inert ballast and changes in working fluid properties. Since it is rather rare to have custom-built gas turbines for low Lower Heating Value (LHV) operation, the engine will be forced to operate outside its design envelope. This, in turn, poses limitations to usable fuel choices. Typical restraints are decrease in Wobbe-index and surge- and flutter-margins for turbomachinery. In this study, an advanced performance deck has been used to quantify the impact of firing low-LHV gases in a generic type gas turbine. A single-shaft gas turbine characterized by a compressor and an expander map is considered. Emphasis has been put on predicting the off-design behavior. The combustor is discussed and related to previous experiments which include investigation of flammability limits, Wobbe-index, flame position, etc. The computations show that at constant turbine inlet temperature (TIT), the shaft power and the pressure ratio will increase, however the surge margin will decrease. Possible design changes in the component level are also discussed. Aerodynamic issues (and necessary modifications) that can pose severe limitations on the gas turbine compressor- and turbine sections are discussed. Typical methods for axial turbine capacity adjustment are presented and discussed. Copyright © 2007 by ASME.},
  author       = {Orbay, Raik and Eriksson, Pontus and Genrup, Magnus and Klingmann, Jens},
  booktitle    = {Proceedings of the ASME Turbo Expo},
  keyword      = {Low Lower Heating Value (LHV),Expander map,Inert ballast,Wobbe-index},
  language     = {eng},
  pages        = {733--741},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Off-design performance investigation of a low calorific value gas fired generic type single-shaft gas turbine},
  volume       = {2},
  year         = {2007},
}