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

Orbay, Raik LU ; Genrup, Magnus; Eriksson, Pontus LU and Klingmann, Jens LU (2008) In Journal of Engineering for Gas Turbines and Power 130(3). p.1-031504
Abstract
When low calorific value gases are fired, the performance and stability of gas turbines may deteriorate due to a large amount of inertballast 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 recuperated as well as unrecuperated gas turbine. A single-shaft gas turbine characterized by a compressor and an... (More)
When low calorific value gases are fired, the performance and stability of gas turbines may deteriorate due to a large amount of inertballast 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 recuperated as well as unrecuperated 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 that include investigation of flammability limits, Wobbe index, flame position, etc. The computations show that at constant turbine inlet temperature, 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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Engineering for Gas Turbines and Power
volume
130
issue
3
pages
7 pages
publisher
American Society of Mechanical Engineers
external identifiers
  • wos:000255669300006
  • scopus:48949120474
ISSN
1528-8919
DOI
10.1115/1.2836482
language
English
LU publication?
yes
id
6bd59ed7-88a3-4fce-a2a3-300da1b65be9 (old id 1204648)
date added to LUP
2008-09-17 14:50:16
date last changed
2017-01-01 04:24:50
@article{6bd59ed7-88a3-4fce-a2a3-300da1b65be9,
  abstract     = {When low calorific value gases are fired, the performance and stability of gas turbines may deteriorate due to a large amount of inertballast 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 recuperated as well as unrecuperated 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 that include investigation of flammability limits, Wobbe index, flame position, etc. The computations show that at constant turbine inlet temperature, 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.},
  author       = {Orbay, Raik and Genrup, Magnus and Eriksson, Pontus and Klingmann, Jens},
  issn         = {1528-8919},
  language     = {eng},
  number       = {3},
  pages        = {1--031504},
  publisher    = {American Society of Mechanical Engineers},
  series       = {Journal of Engineering for Gas Turbines and Power},
  title        = {Off-design performance investigation of a low calorific value gas fired generic-type single-shaft gas turbine},
  url          = {http://dx.doi.org/10.1115/1.2836482},
  volume       = {130},
  year         = {2008},
}