Gas concentration measurements for process control, emissions monitoring and safety purposes are ubiquitous in refineries. The instrumentation is dominated by gas chromatographs, but over the past few years another technology has slowly found its way into many refineries: gas analysers based on tunable diode laser absorption spectroscopy (TDLAS).

This article is the first of a series of application studies for TDLAS analysers in refineries, which provides a short introduction to the underlying technology and a brief overview of refinery-related applications.
In the October 2018 issue of Hydrocarbon Engineering, the first of several application examples will be discussed in detail: the usage of TDLAS analysers for in-situ tail gas analysis in sulfur recovery units (SRUs).

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Reprinted from HYDROCARBON ENGINEERING, May 2018