Measurements of N2, CO2, Ar, O2 and Air Pressure Broadening Coefficients of the HCl P(5) Line in the 1–0 Band Using an Interband Cascade Laser

Volker Ebert,Javis A Nwaboh,Olav Werhahn,Gang Li,Zhechao Qu

doi:10.3390/app11115190

Volker Ebert, Javis A Nwaboh + Show 3 more

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https://doi.org/10.3390/app11115190

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Journal: Applied Sciences	Publication Date: Jun 3, 2021
Citations: 5	License type: CC BY 4.0

Affiliation: Physikalisch-Technische Bundesanstalt

Abstract

We determine the CO2, N2, Ar, O2 and air pressure broadening coefficients of the H35Cl P(5) absorption line at 2775.77 cm−1 in the fundamental (1←0) band using a newly developed direct tunable diode laser absorption spectroscopy (dTDLAS)-based spectrometer employing a mid-IR interband cascade laser (ICL). For the first time, a reliable and consistent set of five different foreign pressure broadening coefficients for the same HCl P(5) line has been measured by a consistent metrological approach covering pressures from 100 to 600 hPa at temperatures of 294 and 295 K. The relative uncertainties of the stated CO2, N2, Ar, O2 and Air pressure broadening coefficients are in 1–3% range. The results are compared to previously available literature data—two broadening coefficients have been improved in accuracy and two have been determined for the first time in the sub 1000 hPa pressure range.

Highlights

Hydrogen chloride (HCl) is a harmful gas which is released to the atmosphere, e.g., from fossil fuel power plants or waste incinerators
This study focuses on the HCl P(5) transition line in the 1–0 band, which is optimal for HCl measurements in hot flue gases, as it is spectrally well isolated from water and CO2
Coefficient cell was filled with the HCl/CO2 gas mixture at a steady flow rate of 200 sccm set via a mass flow order to derive the HCl-CO2 broadening coefficient, a custom

Summary

Introduction

Hydrogen chloride (HCl) is a harmful gas which is released to the atmosphere, e.g., from fossil fuel power plants or waste incinerators. It is a process gas in many industries such as the electronic or textile industry. Industrial processes are often large-scale point sources with gas abatement systems which can be optimized to reduce the emissions. In the EU, HCl emissions from the industry are covered by Industrial Emissions Directive. The HCl emission measurement, as described in EN-standard 1911: 2010, does not fully extend down to concentration levels consistent with the increasingly stringent. Emission Limit Values (ELVs) that will come into force [1]. The EMPIR project IMPRESS2 [2]

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