Processes of Formation and Suppression of Nitrogen Oxides during Combustion of Coal Sludge and Composite Fuels Based on It
G. V. Kuznetsov1,2, V. V. Dorokhov1,2, K. Yu. Vershinina1, P. A. Strizhak1,2
1Tomsk Polytechnic University, Tomsk, Russia
2Kutateladze Institute of Thermal Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: coal waste, composite fuels, combustion, gas emissions, nitrogen oxide emission reduction, multicriteria analysis
Abstract
The results of an experimental study of the thermal oxidation characteristics and combustion product composition of coal slurry and composite fuels based on it, with the addition of water and dispersed wood, are presented. The positive effect of the additives on the critical ignition temperature, burnout efficiency, and anthropogenic gas emissions is substantiated. The main mechanisms and schemes for the formation and suppression of nitrogen oxides at different stages of thermal conversion are presented. The most effective conditions for reducing nitrogen oxide emissions are determined. Using a multicriteria analysis technique, the environmental, economic, and energy advantages of composite fuels over the original coal slurry are demonstrated. Dry fuel mixtures based on coal slurry and biomass with a mass fraction of the latter of 30 and 50% are found to have the greatest potential. Compared to coal slurry, the efficiency of such fuels is 30 to 45% higher. With maximum emphasis on environmental indicators, composite liquid fuels hold the greatest promise.
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