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This article is devoted to the features of the formation of nitrogen oxides in boilers with cyclone-vortex pre-furnaces and the possibility of using technological measures to reduce them. According to existing notion, combustion devices with high thermal voltages are characterized by high emission of nitrogen oxides. The influence of the design of the gas inlets into the combustion chamber of the cyclone-vortex pre-furnace on the emission of nitrogen oxides was defined by experimental methods. Additionally, a study was conducted under various modes of operation of the boiler of the furnace process inside the combustion chamber of a cyclone-vortex pre-furnace. It is necessary to point that the optimal nozzle design and water-fuel ratio were selected by means of water injection. Based on these studies, the factors affecting the formation of nitrogen oxides are identified. As a result, the most effective technological methods for low-emission operation of a 116-megawatt boiler with cyclone pre-furnaces were determined

Nitrogen Oxides Emissions Reduction Methods for Boilers with Air-Cooled Cyclone-Vortex Pre-Furnaces