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Ammonia Measurements with Femtosecond Two-Photon Laser-Induced Fluorescence in Premixed NH3/Air Flames

Liu, Jixu ; Gao, Qiang LU ; Li, Bo LU ; Zhang, Dayuan ; Tian, Yifu and Li, Zhongshan LU (2019) In Energy and Fuels
Abstract

Ammonia (NH3), which can be a hydrogen carrier, is a promising alternative to fossil fuels in the future carbon-free economy. In situ techniques feasible for the remote and non-intrusive detection of NH3 will provide strong support for developing clean NH3 combustion. Here, we demonstrated a femtosecond two-photon laser-induced fluorescence (fs-TPLIF) technique for interference-free in situ NH3 measurements in laminar premixed NH3/air flames. The two-head band of NH3 at ∼565 nm was observed, which verifies the feasibility of fs-TPLIF for NH3 measurements in a combustion environment. The single-shot NH3 fs-TPLIF images with efficient signal-to-noise... (More)

Ammonia (NH3), which can be a hydrogen carrier, is a promising alternative to fossil fuels in the future carbon-free economy. In situ techniques feasible for the remote and non-intrusive detection of NH3 will provide strong support for developing clean NH3 combustion. Here, we demonstrated a femtosecond two-photon laser-induced fluorescence (fs-TPLIF) technique for interference-free in situ NH3 measurements in laminar premixed NH3/air flames. The two-head band of NH3 at ∼565 nm was observed, which verifies the feasibility of fs-TPLIF for NH3 measurements in a combustion environment. The single-shot NH3 fs-TPLIF images with efficient signal-to-noise ratios were obtained. The variation of the thickness of the reaction zone with the equivalence ratio of NH3 flames was also obtained. As a result of the broad line width of the femtosecond laser, the OH fluorescence was also observed together with the NH3 fluorescence. The potential of fs-TPLIF for simultaneous measurements of NH3 and OH with only one laser was analyzed. The laser power dependence of NH3 and NH emissions was investigated. The radial distributions of NH3, NH, and OH in the flame were also discussed. This work is the first attempt of fs-TPLIF for NH3 measurements in a combustion environment, and the results indicate that fs-TPLIF is a feasible tool for NH3 measurements in combustion diagnostics.

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organization
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Contribution to journal
publication status
epub
subject
in
Energy and Fuels
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85072643050
ISSN
0887-0624
DOI
10.1021/acs.energyfuels.9b02121
language
English
LU publication?
yes
id
e2df2966-2dc0-405c-af89-92996e72d612
date added to LUP
2019-10-07 13:45:09
date last changed
2020-01-13 02:27:10
@article{e2df2966-2dc0-405c-af89-92996e72d612,
  abstract     = {<p>Ammonia (NH<sub>3</sub>), which can be a hydrogen carrier, is a promising alternative to fossil fuels in the future carbon-free economy. In situ techniques feasible for the remote and non-intrusive detection of NH<sub>3</sub> will provide strong support for developing clean NH<sub>3</sub> combustion. Here, we demonstrated a femtosecond two-photon laser-induced fluorescence (fs-TPLIF) technique for interference-free in situ NH<sub>3</sub> measurements in laminar premixed NH<sub>3</sub>/air flames. The two-head band of NH<sub>3</sub> at ∼565 nm was observed, which verifies the feasibility of fs-TPLIF for NH<sub>3</sub> measurements in a combustion environment. The single-shot NH<sub>3</sub> fs-TPLIF images with efficient signal-to-noise ratios were obtained. The variation of the thickness of the reaction zone with the equivalence ratio of NH<sub>3</sub> flames was also obtained. As a result of the broad line width of the femtosecond laser, the OH fluorescence was also observed together with the NH<sub>3</sub> fluorescence. The potential of fs-TPLIF for simultaneous measurements of NH<sub>3</sub> and OH with only one laser was analyzed. The laser power dependence of NH<sub>3</sub> and NH emissions was investigated. The radial distributions of NH<sub>3</sub>, NH, and OH in the flame were also discussed. This work is the first attempt of fs-TPLIF for NH<sub>3</sub> measurements in a combustion environment, and the results indicate that fs-TPLIF is a feasible tool for NH<sub>3</sub> measurements in combustion diagnostics.</p>},
  author       = {Liu, Jixu and Gao, Qiang and Li, Bo and Zhang, Dayuan and Tian, Yifu and Li, Zhongshan},
  issn         = {0887-0624},
  language     = {eng},
  month        = {08},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Energy and Fuels},
  title        = {Ammonia Measurements with Femtosecond Two-Photon Laser-Induced Fluorescence in Premixed NH<sub>3</sub>/Air Flames},
  url          = {http://dx.doi.org/10.1021/acs.energyfuels.9b02121},
  doi          = {10.1021/acs.energyfuels.9b02121},
  year         = {2019},
}