Portable Gas Analyzer Based on Fourier Transform Infrared Spectrometer for Patrolling and Examining Gas Exhaust

Abstract EN

Aimed at monitoring emission of organic gases such as CH4, C2H6, C3H8, iso-C4H10, n-C4H10, C2H4, C3H6, C2H2, CO, and CO2, from coal mines, petroleum refineries, and other plants, a Fourier Transform Infrared (FT-IR) spectrometer was used to develop a portable gas analyzer for patrolling and examining gas exhaust.

Firstly, structure of the instrument was introduced.

Then, a spectral analysis approach was presented.

Finally, instrument was tested with standard gases and with actual gases emitted from a petroleum refinery.

For the latter test, a gas chromatograph (GC) was used as a reference instrument.

The test results showed that the detection limit of every component of analyte was less than 10 × 10−6.

The maximum test error of every analyte was less than 15 × 10−6 when its practical concentration was no more than 500 × 10−6.

A final comparison showed that the result curves of analytes obtained with FT-IR spectrometer almost overlapped with those obtained with GC, and their resulting noise was less than 6.4% when the practical gas concentration was above 100 × 10−6.

As a result, our instrument was suitable to be used as a portable instrument for monitoring exhaust gases.