Title: Effects of the spatial heterogeneity of gas matrix and thermal boundary layers on absolute TDLAS HCl measurements in hot flue gases
Authors: Qu, Zhechao, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 3.4, Analytische Chemie der Gasphase
Nwaboh, Javis, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 3.4, Analytische Chemie der Gasphase
Werhahn, Olav, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 3.4, Analytische Chemie der Gasphase
Ebert, Volker, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 3.4, Analytische Chemie der Gasphase
Contributors: HostingInstitution: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887
Pages:1
Language:en
DOI:10.7795/810.20200309
Resource Type: Text / Poster
Publisher: Physikalisch-Technische Bundesanstalt (PTB)
Rights: Download for personal/private use only, if your national copyright law allows this kind of use.
Dates: Available: 2020-03-13
File: Download File (application/pdf) 3.69 MB (3869958 Bytes)
MD5 Checksum: fa6dca694261d11cdd11e9afe9880991
SHA256 Checksum: ae858c16250e7a4f3f5460b61922965935984089d603c2c345d488ff5ffdfcd6
Keywords: HCl-dTDLAS ; boundary layer ; temperature gradient ; gas matrix
Abstract: European Directives are coming into force setting increasingly stringent Emission Limit Values (ELVs) for key air pollutants and regulating emissions from combustion processes. Accurate meas-urement of emissions to the atmosphere is vital to control and reduce air pollution. Optical methods offer promising tools to investigate the dynamic release of molecular species from combustion envi-ronments. The IMPRESS 2 project [1] goes beyond state of the art in measuring the emissions of critical pollutants (e.g. HCl) with lower ELVs.
Tunable diode laser absorption spectroscopy (TDLAS) [2-4] is frequently applied in combustion research and industry for sampling-free and in situ gas analysis [5], but its application is normally limited to uniform conditions along the line-of-sight (LOS). However, in many applications, for ex-ample, combustion diagnostic measurements, heterogeneities (e.g. temperature, gas matrix) along the LOS may occur. In those conditions, the effects of heterogeneities should be considered for spectral fitting and concentration quantification [6].
A direct TDLAS (dTDLAS) based HCl spectrometer [7] has been developed in PTB recently. Here, the key point of this presentation is a better understanding of the effects of spatial gas matrix heter-ogeneity on the absolute accuracy of this spectrometer. A simulation model will be used here to ana-lyze the effects of spatial heterogeneities on dTDLAS HCl concentration measurement.
This work was supported by IMPRESS2 within the EMPIR.
Citation: Qu, Zhechao ; Nwaboh, Javis ; Werhahn, Olav ; Ebert, Volker. Effects of the spatial heterogeneity of gas matrix and thermal boundary layers on absolute TDLAS HCl measurements in hot flue gases, 2020. Physikalisch-Technische Bundesanstalt (PTB). DOI: https://doi.org/10.7795/810.20200309