MODELLING AND EXPERIMENTAL EVALUATION OF NITROGEN OXIDES EMISSIONS IN BRAZILIAN BAGASSE BOILERS

摘要

This paper presents the results of the experimental and analytical evaluation of nitrogen oxides emission from bagasse boilers. There are limited data on NO_X emissions from sugarcane bagasse boilers in the Brazilian and international technical literature and little information on the influence of the types of combustion system, operating parameters (air excess), and fuel composition on the prevention of NO_X formation. In this paper, data from a Brazilian sugar factory are compared with predictions from different models and data from technical literature. The influence of boiler operation parameters (excess air variation and boiler load) on emissions levels is also studied. These data may establish a basis to assist in the selection of the appropriate methods for the prevention and control of the NO_X emissions in bagasse boilers. It may be concluded that the 'fuel mechanism' is the most important one in NOx formation during bagasse combustion in industrial furnaces, although thermal mechanism also contributes to NO_X formation.