FT-IR Spectroscopy for the in-Flame Study of a 15 MW Dual Fuel Gas/Oil Burner

Abstract

An FT-IR (Fourier transform infrared) analyzer has been configured for combustion research and allows the simultaneous quantification of CO, CO₂, CH₄, C₂H₆, C₂H₂, C₂H₄, NO, and N₂O concentrations in the flame of natural gas burners. The calibration has been carried out by the multivariate PLS1 algorithm, with calculated standard spectra. For the multivariate CO/CO₂ model, special attention has been given to nonlinear effects caused by interference in the 2210–2250 cm⁻¹ region. For this model, two methods of calculating mixture spectra and their influence on prediction parameters are evaluated. Furthermore, the sensitivity of the CO/CO₂ model for N₂O interference has been tested. The presented results show that conclusions drawn from statistical prediction parameters should be treated cautiously in models that have to deal with spectral interference.

Keywords

FT-IR PLS1 Flame analysis Combustion

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