Simultaneous Quantitative Detection of HCN and C<sub>2</sub>H<sub>2</sub> in Combustion Environment Using TDLAS
Emission of nitrogen oxides (NO<sub>x</sub>) and soot particles during the combustion of biomass fuels and municipal solid waste is a major environmental issue. Hydrogen cyanide (HCN) and acetylene (C<sub>2</sub>H<sub>2</sub>) are important precursors of NO<sub...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/2ffcc07416f1495eaf73a2ab0e344f0f |
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| Sumario: | Emission of nitrogen oxides (NO<sub>x</sub>) and soot particles during the combustion of biomass fuels and municipal solid waste is a major environmental issue. Hydrogen cyanide (HCN) and acetylene (C<sub>2</sub>H<sub>2</sub>) are important precursors of NO<sub>x</sub> and soot particles, respectively. In the current work, infrared tunable diode laser absorption spectroscopy (IR-TDLAS), as a non-intrusive in situ technique, was applied to quantitatively measure HCN and C<sub>2</sub>H<sub>2</sub> in a combustion environment. The P(11e) line of the first overtone vibrational band <i>v</i><sub>1</sub> of HCN at 6484.78 cm<sup>−1</sup> and the P(27e) line of the <i>v</i><sub>1</sub> + <i>v</i><sub>3</sub> combination band of C<sub>2</sub>H<sub>2</sub> at 6484.03 cm<sup>−1</sup> were selected. However, the infrared absorption of the ubiquitous water vapor in the combustion environment brings great uncertainty to the measurement. To obtain accurate temperature-dependent water spectra between 6483.8 and 6485.8 cm<sup>−1</sup>, a homogenous hot gas environment with controllable temperatures varying from 1100 to 1950 K provided by a laminar flame was employed to perform systematic IR-TDLAS measurements. By fitting the obtained water spectra, water interference to the HCN and C<sub>2</sub>H<sub>2</sub> measurement was sufficiently mitigated and the concentrations of HCN and C<sub>2</sub>H<sub>2</sub> were obtained. The technique was applied to simultaneously measure the temporally resolved release of HCN and C<sub>2</sub>H<sub>2</sub> over burning nylon 66 strips in a hot oxidizing environment of 1790 K. |
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