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- Title
Non-intrusive in situ detection of methyl chloride in hot gas flows using infrared degenerate four-wave mixing.
- Authors
Sahlberg, A.‐L.; Zhou, J.; Aldén, M.; Li, Z. S.
- Abstract
We demonstrate the potential of infrared degenerate four-wave mixing (IR-DFWM) as a tool for non-intrusive in situ spatially resolved detection of CH3Cl in reactive hot gas flows especially feasible for applications to biomass combustion and gasification. IR-DFWM spectra of CH3Cl, by probing ro-vibrational transitions belonging to the fundamental stretching modes v1 and v4, have been successfully recorded in gas flows diluted with nitrogen at atmospheric pressure and elevated temperatures up to 820 K. In order to identify the spectral lines of CH3Cl, the recorded IR-DFWM spectra are compared with simulations using molecular parameters extracted from the HITRAN database. The potential interference from water vapor is discussed from measurements of H2O spectrum at 820 K combined with simulations of H2O IR-DFWM spectrum based on the HITEMP database, and it was found that the QQ6 line of the v1 band is relatively free from water interference at elevated temperatures. At atmospheric pressure, the detection limits for temperatures at 296, 550 and 820 K were estimated to be 2.1, 3.1 and 6.2 (×1015 molecules/cm3), respectively, by scanning the QQ6 line of the v1 band. These results show the potential of interference free detection of CH3Cl with IR-DFWM in harsh environments like combustion. Copyright © 2015 John Wiley & Sons, Ltd.
- Subjects
METHYL chloride; HALOALKANES; HALOMETHANES; ORGANOCHLORINE compounds; GAS flow
- Publication
Journal of Raman Spectroscopy, 2015, Vol 46, Issue 8, p695
- ISSN
0377-0486
- Publication type
Article
- DOI
10.1002/jrs.4651