Multipass open-path Fourier-transform infrared measurements for nonintrusive monitoring of gas turbine exhaust composition.
The detection limits for NO and NO2 in turbine exhausts by nonintrusive monitoring have to be improved. Multipass mode Fourier-transform infrared (FTIR) absorption spectrometry and use of a White mirror system were found from a sensitivity study with spectra simulations in the mid-infrared to be essential for the retrieval of NO2 abundances. A new White mirror system with a parallel infrared beam was developed and tested successfully with a commercial FTIR spectrometer in different turbine test beds. The minimum detection limits for a typical turbine plume of 50 cm in diameter are approximately 6 parts per million (ppm) for NO and 9 ppm for NO2 (as well 100 ppm for CO2 and 4 ppm for CO).
Schäfer
Klaus
K
Institute for Meteorology and Climate Research, Atmospheric Environmental Research, Forschungszentrum Karlsruhe GmbH, Kreuzeckbahnstrasse 19, Garmisch-Partenkirchen 82467, Germany. Klaus.schaefer@imk.fzk.de
Brockmann
Klaus
K
Heland
Jörg
J
Wiesen
Peter
P
Jahn
Carsten
C
Legras
Olivier
O
D000465:Algorithms; D004784:Environmental Monitoring / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D009569:Nitric Oxide / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D017550:Spectroscopy, Fourier Transform Infrared / Q000295:instrumentation* / Q000379:methods*; D001335:Vehicle Emissions / Q000032:analysis*
D001335:Vehicle Emissions; D009569:Nitric Oxide; D009609:Nitrous Oxide