Abstract
When fossil fuels are burned with air, some of the oxygen and nitrogen present combine to form nitrogen oxides. Their concentrations depends upon variables such as flame temperature, oxygen concentration and nitrogen content in fuels.Because of the absence of practically available techniques for removing nitrogen oxides from flue gases, the efforts are focused to the combustion modification techniques for eliminating the nitrogen oxide emissions. The present status of their development, such as two stage combustion, flue gas recirculation, off-stoichiometric combustion and etc., are described in this paper.Some problems for the determination of nitrogen oxides in flue gases are also described here.
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