Fundamental Study on the Simultaneous and Quantitative Analysis of Nitrogen Monoxide, Nitrogen Dioxide and Ammonia in Flue Gas by means of Fourier Transform Infrared Spectrometry

Abstract

A commercial standard gas generator was partially reconstructed and third component gas mixer was made by authors to make the mixing possible at any desired concentrations of three kinds of gases. The burner and gas sampling tube were designed for the analysis of generated gas by means of both infrared and chemiluminescence spectrometries. The results obtained are summarized as follows.1) A linear relationship was observed between the gas concentrations of wide range and infrared absorption due to NO (1∼5000 ppm) and NO₂ (1∼1000 ppm) by the use of 10 cm and 20 m gas cells.2) Quantitative and simultaneous analysis of following NO, NO₂ and NH, in flue gas produced by combustion was achieved by the use of the gas sampling tube and the reconstructed standard gas generator system. Since a linear relationship was also indicated between the concentrations and absorptions.3) Quantities of NO and NO₂ in the gas produced by the combustion of model fuel, a mixture of propane and air, w ere effectively measured to discuss the relation with the quantity of NH₃ added in the fuel or in the gas produced.
The quantities of NO and NO₂ determined by the proposed method were in approximate coincidence with those obtained by chemiluminescence method.