Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the ASME Turbo Expo 2009 |
| Subtitle of host publication | Power for Land, Sea and Air |
| Pages | 125-135 |
| Number of pages | 11 |
| Publication status | Published - 2009 |
| Externally published | Yes |
| Event | 2009 ASME Turbo Expo: Power for Land, Sea, and Air - Orlando, FL, United States Duration: 8 Jun 2009 → 12 Jun 2009 |
Publication series
| Name | Proceedings of the ASME Turbo Expo |
|---|---|
| Volume | 2 |
Abstract
A premixed pilot injection with reduced NOx formation is proposed as a fail-safe and simple control method to extend the operating range of gas turbines. Different pilot locations within the combustion chamber were chosen to see the impact of pilot injection flames on the local extinction behavior and on the NOx formation. The pilot flame injector (PFI) represents a device for premixed pilot injection and was located in the center of the swirl burner cone. Moreover, the premixed pilot could be ignited by an embedded spark plug inside the PFI so that the main flame, especially near the lean limit, can be provided with additional radicals at the lower stagnation point of the central recirculation zone. A second pilot injection was located at the combustor dump to inject the pilot fuel/air mixture axially into the shear layer between the central and side recirculation zone. It could be shown for different main air preheat temperatures and with activated PFI flame (at 110 Hz spark frequency), that the premixed pilot is the most efficient control method for local extinction prevention without CO emission increase. Also the NO x emissions keep on similar level as the baseline case. The spark plug might also be replaced by a laser ignition device. The efficiency of laser spark plugs could be already demonstrated under atmospheric conditions in Moesl2008 [1] where different ignition devices are proposed to ignite a swirl-stabilized kerosine mixture. Moreover, former tests with the PFI flame indicate also a method to control instabilities so that high amplitude of p' oscillations could be suppressed.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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Proceedings of the ASME Turbo Expo 2009: Power for Land, Sea and Air. 2009. p. 125-135 GT2009-59181 (Proceedings of the ASME Turbo Expo; Vol. 2).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Pilot-premix flames
T2 - 2009 ASME Turbo Expo
AU - Albrecht, Peter
AU - Bade, Stefanie
AU - Paschereit, Christian Oliver
AU - Dinkelacker, Friedrich
AU - Gutmark, Ephraim
PY - 2009
Y1 - 2009
N2 - A premixed pilot injection with reduced NOx formation is proposed as a fail-safe and simple control method to extend the operating range of gas turbines. Different pilot locations within the combustion chamber were chosen to see the impact of pilot injection flames on the local extinction behavior and on the NOx formation. The pilot flame injector (PFI) represents a device for premixed pilot injection and was located in the center of the swirl burner cone. Moreover, the premixed pilot could be ignited by an embedded spark plug inside the PFI so that the main flame, especially near the lean limit, can be provided with additional radicals at the lower stagnation point of the central recirculation zone. A second pilot injection was located at the combustor dump to inject the pilot fuel/air mixture axially into the shear layer between the central and side recirculation zone. It could be shown for different main air preheat temperatures and with activated PFI flame (at 110 Hz spark frequency), that the premixed pilot is the most efficient control method for local extinction prevention without CO emission increase. Also the NO x emissions keep on similar level as the baseline case. The spark plug might also be replaced by a laser ignition device. The efficiency of laser spark plugs could be already demonstrated under atmospheric conditions in Moesl2008 [1] where different ignition devices are proposed to ignite a swirl-stabilized kerosine mixture. Moreover, former tests with the PFI flame indicate also a method to control instabilities so that high amplitude of p' oscillations could be suppressed.
AB - A premixed pilot injection with reduced NOx formation is proposed as a fail-safe and simple control method to extend the operating range of gas turbines. Different pilot locations within the combustion chamber were chosen to see the impact of pilot injection flames on the local extinction behavior and on the NOx formation. The pilot flame injector (PFI) represents a device for premixed pilot injection and was located in the center of the swirl burner cone. Moreover, the premixed pilot could be ignited by an embedded spark plug inside the PFI so that the main flame, especially near the lean limit, can be provided with additional radicals at the lower stagnation point of the central recirculation zone. A second pilot injection was located at the combustor dump to inject the pilot fuel/air mixture axially into the shear layer between the central and side recirculation zone. It could be shown for different main air preheat temperatures and with activated PFI flame (at 110 Hz spark frequency), that the premixed pilot is the most efficient control method for local extinction prevention without CO emission increase. Also the NO x emissions keep on similar level as the baseline case. The spark plug might also be replaced by a laser ignition device. The efficiency of laser spark plugs could be already demonstrated under atmospheric conditions in Moesl2008 [1] where different ignition devices are proposed to ignite a swirl-stabilized kerosine mixture. Moreover, former tests with the PFI flame indicate also a method to control instabilities so that high amplitude of p' oscillations could be suppressed.
UR - http://www.scopus.com/inward/record.url?scp=77953191434&partnerID=8YFLogxK
U2 - 10.1115/GT2009-59181
DO - 10.1115/GT2009-59181
M3 - Conference contribution
AN - SCOPUS:77953191434
SN - 9780791848838
T3 - Proceedings of the ASME Turbo Expo
SP - 125
EP - 135
BT - Proceedings of the ASME Turbo Expo 2009
Y2 - 8 June 2009 through 12 June 2009
ER -