Implementation of a Quantum Cascade Laser-based Gas Sensor Prototype for Sub-ppmv HS Measurements in a Petrochemical Process Gas Stream

Overview

Journal Anal Bioanal Chem

Specialty Chemistry

Date 2016 Sep 19

PMID 27640208

Citations 8

Authors

Harald Moser

Walter Polz

Johannes Paul Waclawek

Johannes Ofner

Bernhard Lendl

Affiliations

Soon will be listed here.

Abstract

The implementation of a sensitive and selective as well as industrial fit gas sensor prototype based on wavelength modulation spectroscopy with second harmonic detection (2f-WMS) employing an 8-μm continuous-wave distributed feedback quantum cascade laser (CW-DFB-QCL) for monitoring hydrogen sulfide (HS) at sub-ppm levels is reported. Regarding the applicability for analytical and industrial process purposes aimed at petrochemical environments, a synthetic methane (CH) matrix of up to 1000 ppmv together with a varying HS content was chosen as the model environment for the laboratory-based performance evaluation performed at TU Wien. A noise-equivalent absorption sensitivity (NEAS) for HS targeting the absorption line at 1247.2 cm was found to be 8.419 × 10 cm Hz, and a limit of detection (LOD) of 150 ppbv HS could be achieved. The sensor prototype was then deployed for on-site measurements at the petrochemical research hydrogenation platform of the industrial partner OMV AG. In order to meet the company's on-site safety regulations, the HS sensor platform was installed in an industry rack and equipped with the required safety infrastructure for protected operation in hazardous and explosive environments. The work reports the suitability of the sensor prototype for simultaneous monitoring of HS and CH content in the process streams of a research hydrodesulfurization (HDS) unit. Concentration readings were obtained every 15 s and revealed process dynamics not observed previously.

Citing Articles

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Characterization of HS QEPAS detection in methane-based gas leaks dispersed into environment.

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