Portable gas analyzer based on fourier transform infrared spectrometer for patrolling and examining gas Exhaust

Abstract

Aimed at monitoring emission of organic gases such as CH C C iso-C n-C C C C CO, and CO 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.